diff --git a/Makefile b/Makefile
index 54c648c..0b2aba0 100644
--- a/Makefile
+++ b/Makefile
@@ -19,10 +19,11 @@ CFLAGS_DEBUG :=\
 	-std=c++20 -Wall -Wextra \
 	-O0 -fno-inline -gsplit-dwarf \
 	-g -fno-omit-frame-pointer \
-	-fsanitize=address \
 	-Wno-unused-command-line-argument \
 	-I./include -I./libs -I/home/syed/main/crib/libs/mruby/include
 
+# C_SANITIZER := -fsanitize=address
+
 CFLAGS_RELEASE :=\
 	-static --target=x86_64-linux-musl \
 	-std=c++20 -O3 -march=x86-64 -mtune=generic \
@@ -78,7 +79,7 @@ $(PCH_RELEASE): $(INCLUDE_DIR)/pch.h
 
 $(TARGET_DEBUG): $(PCH_DEBUG) $(OBJ_DEBUG) $(UNICODE_OBJ_DEBUG)
 	mkdir -p $(BIN_DIR)
-	$(CXX) $(CFLAGS_DEBUG) -o $@ $(OBJ_DEBUG) $(UNICODE_OBJ_DEBUG) $(LIBS_DEBUG)
+	$(CXX) $(CFLAGS_DEBUG) $(C_SANITIZER) -o $@ $(OBJ_DEBUG) $(UNICODE_OBJ_DEBUG) $(LIBS_DEBUG)
 
 $(TARGET_RELEASE): $(PCH_RELEASE) $(OBJ_RELEASE) $(UNICODE_OBJ_RELEASE)
 	mkdir -p $(BIN_DIR)
diff --git a/TODO.md b/TODO.md
index 60982df..7501cf9 100644
--- a/TODO.md
+++ b/TODO.md
@@ -10,19 +10,19 @@ Copyright 2025 Syed Daanish
 ```
 
 * Next few super long boring things to do
-* redo lsp threads such that no mutex needed for any rope stuff
+* redo lsp threads such that no mutex needed for any rope stuff (necessary rn)
     - Also make the classes own the methods in lsp
     - This will mean that parsers/renderers and keystrokes will not need to be individually locked
     - And so it will be much faster
     - At which point the main thread can also be blocked on user input or lsp responses and still be fast
-* Add a superclass for editor called Window (which can be popup or tiled)
-* Add a recursive tiling class for windows
-* Handled by a single renderer that calls and renders each window
-    - And a bg if no window open
-* Make editor's functions into its own methods (classify it)
+* Add a superclass for editor called Window (which can be popup or tiled) (done)
+* Add a recursive tiling class for windows (done)
+* Handled by a single renderer that calls and renders each window (done)
+* Make editor's functions into its own methods (classify it) (done)
     - While at it
         - Seperate system functions into a class that branches to support local / ssh / server modes.
         - Even lsp shouldnt be directly controlled because it can branch on local and server modes
+            - check wolfSSH stuff for remote editing
     - Redo hooks as a engine of its own.
     - And factorize renderer into its own class (and make it just return an array of the render without knowing teh x,y)
         - which is just managed by the renderer
diff --git a/include/editor/completions.h b/include/editor/completions.h
index 9cdc3f4..c2500cb 100644
--- a/include/editor/completions.h
+++ b/include/editor/completions.h
@@ -23,6 +23,7 @@ struct CompletionItem {
 };
 
 struct CompletionSession {
+  struct Editor *editor;
   std::shared_mutex mtx;
   bool active = false;
   Coord hook;
@@ -40,7 +41,14 @@ struct CompletionSession {
   std::atomic<bool> hover_dirty = false;
   int version;
 
-  CompletionSession() : box(this) {}
+  CompletionSession(Editor *editor) : editor(editor), box(this) {}
+
+  void resolve_doc();
+  void accept();
+  void next();
+  void prev();
+  void choose(uint8_t index);
+  void handle(KeyEvent event);
 };
 
 #endif
diff --git a/include/editor/editor.h b/include/editor/editor.h
index 4857231..7a19e36 100644
--- a/include/editor/editor.h
+++ b/include/editor/editor.h
@@ -1,16 +1,14 @@
 #ifndef EDITOR_H
 #define EDITOR_H
 
-#include "editor/completions.h"
 #include "editor/indents.h"
 #include "io/knot.h"
 #include "io/sysio.h"
 #include "syntax/extras.h"
 #include "syntax/parser.h"
-#include "ui/completionbox.h"
 #include "ui/diagnostics.h"
-#include "ui/hover.h"
 #include "utils/utils.h"
+#include "windows/decl.h"
 
 #define CHAR 0
 #define WORD 1
@@ -19,144 +17,159 @@
 #define EXTRA_META 2
 #define INDENT_WIDTH 2
 
-struct Editor {
-  std::string filename;
-  std::string uri;
-  Knot *root;
-  std::shared_mutex knot_mtx;
-  Coord cursor;
-  uint32_t cursor_preffered;
-  Coord selection;
-  bool selection_active;
-  bool unix_eol;
-  int selection_type;
-  Coord position;
-  Coord size;
-  Coord scroll;
-  Language lang;
-  uint32_t hooks[94];
-  bool jumper_set;
-  std::shared_mutex v_mtx;
-  std::vector<VWarn> warnings;
-  bool warnings_dirty;
-  VAI ai;
+struct Editor : Window {
+  std::string filename = "";
+  std::string uri = "";
+  Knot *root = nullptr;
+  Coord cursor = {0, 0};
+  uint32_t cursor_preffered = 0;
+  Coord selection = {0, 0};
+  bool selection_active = false;
+  bool unix_eol = true;
+  int selection_type = 0;
+  Coord size = {0, 0};
+  Coord scroll = {0, 0};
+  Language lang = {};
+  uint32_t hooks[94] = {0};
+  bool jumper_set = false;
+  std::vector<VWarn> warnings = {};
+  bool warnings_dirty = false;
+  VAI ai = {};
   std::shared_mutex lsp_mtx;
-  std::shared_ptr<struct LSPInstance> lsp;
-  bool hover_active;
-  HoverBox hover;
-  bool diagnostics_active;
-  DiagnosticBox diagnostics;
+  std::atomic<struct LSPInstance *> lsp = nullptr;
+  bool hover_active = false;
+  bool diagnostics_active = false;
   std::atomic<int> lsp_version = 1;
-  CompletionSession completion;
-  IndentationEngine indents;
-  Parser *parser;
-  ExtraHighlighter extra_hl;
-  bool is_css_color;
-};
+  IndentationEngine indents = {};
+  Parser *parser = nullptr;
+  ExtraHighlighter extra_hl = {};
+  bool is_css_color = false;
 
-Editor *new_editor(const char *filename_arg, Coord position, Coord size,
-                   uint8_t eol);
-void save_file(Editor *editor);
-void free_editor(Editor *editor);
-void render_editor(Editor *editor);
-void cursor_up(Editor *editor, uint32_t number);
-void cursor_down(Editor *editor, uint32_t number);
-Coord move_left(Editor *editor, Coord cursor, uint32_t number);
-Coord move_right(Editor *editor, Coord cursor, uint32_t number);
-void cursor_left(Editor *editor, uint32_t number);
-void cursor_right(Editor *editor, uint32_t number);
-void scroll_up(Editor *editor, int32_t number);
-void scroll_down(Editor *editor, uint32_t number);
-void ensure_cursor(Editor *editor);
-void ensure_scroll(Editor *editor);
-void handle_editor_event(Editor *editor, KeyEvent event);
-void edit_erase(Editor *editor, Coord pos, int64_t len);
-void edit_insert(Editor *editor, Coord pos, char *data, uint32_t len);
-void edit_replace(Editor *editor, Coord start, Coord end, const char *text,
-                  uint32_t len);
-Coord editor_hit_test(Editor *editor, uint32_t x, uint32_t y);
-char *get_selection(Editor *editor, uint32_t *out_len, Coord *out_start);
-void selection_bounds(Editor *editor, Coord *out_start, Coord *out_end);
-void editor_worker(Editor *editor);
-void move_line_down(Editor *editor);
-void move_line_up(Editor *editor);
-void word_boundaries(Editor *editor, Coord coord, uint32_t *prev_col,
-                     uint32_t *next_col, uint32_t *prev_clusters,
-                     uint32_t *next_clusters);
-void word_boundaries_exclusive(Editor *editor, Coord coord, uint32_t *prev_col,
-                               uint32_t *next_col);
-void editor_lsp_handle(Editor *editor, json msg);
-void apply_lsp_edits(Editor *editor, std::vector<TextEdit> edits, bool move);
-void completion_resolve_doc(Editor *editor);
-void complete_accept(Editor *editor);
-void complete_next(Editor *editor);
-void complete_prev(Editor *editor);
-void complete_select(Editor *editor, uint8_t index);
-void handle_completion(Editor *editor, KeyEvent event);
+  Editor(const char *filename_arg, uint8_t eol);
+  ~Editor();
 
-inline void apply_hook_insertion(Editor *editor, uint32_t line, uint32_t rows) {
-  for (auto &hook : editor->hooks)
-    if (hook > line)
-      hook += rows;
-}
+  void render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) override;
+  void handle_event(KeyEvent event) override;
+  void handle_click(KeyEvent event, Coord size) override;
+  void handle_command(std::string &command) override;
+  void work() override;
+  std::array<std::string, 5> bar_info() override { return {}; };
 
-inline void apply_hook_deletion(Editor *editor, uint32_t removal_start,
-                                uint32_t removal_end) {
-  for (auto &hook : editor->hooks)
-    if (hook > removal_start)
-      hook -= removal_end - removal_start + 1;
-}
+  void save();
+  void cursor_up(uint32_t number);
+  void cursor_down(uint32_t number);
+  void cursor_left(uint32_t number);
+  void cursor_right(uint32_t number);
+  void move_line_down();
+  void move_line_up();
 
-inline static void utf8_normalize_edit(Editor *editor, TextEdit *edit) {
-  std::shared_lock lock(editor->knot_mtx);
-  if (edit->start.row > editor->root->line_count) {
-    edit->start.row = editor->root->line_count;
-    edit->start.col = UINT32_MAX;
-  }
-  if (edit->end.row > editor->root->line_count) {
-    edit->end.row = editor->root->line_count;
-    edit->end.col = UINT32_MAX;
-  }
-  LineIterator *it = begin_l_iter(editor->root, edit->start.row);
-  if (!it)
-    return;
-  uint32_t len;
-  char *line = next_line(it, &len);
-  if (!line) {
+  void scroll_up(uint32_t number);
+  void scroll_down(uint32_t number);
+  void ensure_cursor();
+  void ensure_scroll();
+
+  void edit_erase(Coord pos, int64_t len);
+  void edit_insert(Coord pos, char *data, uint32_t len);
+  void edit_replace(Coord start, Coord end, const char *text, uint32_t len);
+
+  Coord click_coord(uint32_t x, uint32_t y);
+
+  char *get_selection(uint32_t *out_len, Coord *out_start);
+  void selection_bounds(Coord *out_start, Coord *out_end);
+
+  void insert_str(char *c, uint32_t len);
+  void insert_char(char c);
+  void normal_mode();
+  void backspace_edit();
+  void delete_prev_word();
+  void delete_next_word();
+  void clear_hooks_at_line(uint32_t line);
+  void cursor_prev_word();
+  void cursor_next_word();
+  void select_all();
+  void fetch_lsp_hover();
+  void indent_current_line();
+  void dedent_current_line();
+  void indent_selection();
+  void dedent_selection();
+  void paste();
+  void copy();
+  void cut();
+
+  void lsp_handle(json msg);
+  void apply_lsp_edits(std::vector<TextEdit> edits, bool move);
+
+  Coord move_left(Coord cursor, uint32_t number);
+  Coord move_right(Coord cursor, uint32_t number);
+
+  void word_boundaries(Coord coord, uint32_t *prev_col, uint32_t *next_col,
+                       uint32_t *prev_clusters, uint32_t *next_clusters);
+  void word_boundaries_exclusive(Coord coord, uint32_t *prev_col,
+                                 uint32_t *next_col);
+
+  void utf8_normalize_edit(TextEdit *edit) {
+    if (edit->start.row > this->root->line_count) {
+      edit->start.row = this->root->line_count;
+      edit->start.col = UINT32_MAX;
+    }
+    if (edit->end.row > this->root->line_count) {
+      edit->end.row = this->root->line_count;
+      edit->end.col = UINT32_MAX;
+    }
+    LineIterator *it = begin_l_iter(this->root, edit->start.row);
+    if (!it)
+      return;
+    uint32_t len;
+    char *line = next_line(it, &len);
+    if (!line) {
+      free(it->buffer);
+      free(it);
+      return;
+    }
+    if (edit->start.col < len)
+      edit->start.col = utf16_offset_to_utf8(line, len, edit->start.col);
+    else
+      edit->start.col = len;
+    if (edit->end.row == edit->start.row) {
+      if (edit->end.col < len)
+        edit->end.col = utf16_offset_to_utf8(line, len, edit->end.col);
+      else
+        edit->end.col = len;
+      free(it->buffer);
+      free(it);
+      return;
+    }
     free(it->buffer);
     free(it);
-    return;
-  }
-  if (edit->start.col < len)
-    edit->start.col = utf16_offset_to_utf8(line, len, edit->start.col);
-  else
-    edit->start.col = len;
-  if (edit->end.row == edit->start.row) {
+    it = begin_l_iter(this->root, edit->end.row);
+    if (!it)
+      return;
+    line = next_line(it, &len);
+    if (!line) {
+      free(it->buffer);
+      free(it);
+      return;
+    }
     if (edit->end.col < len)
       edit->end.col = utf16_offset_to_utf8(line, len, edit->end.col);
     else
       edit->end.col = len;
     free(it->buffer);
     free(it);
-    return;
   }
-  free(it->buffer);
-  free(it);
-  it = begin_l_iter(editor->root, edit->end.row);
-  if (!it)
-    return;
-  line = next_line(it, &len);
-  if (!line) {
-    free(it->buffer);
-    free(it);
-    return;
+
+  inline void apply_hook_insertion(uint32_t line, uint32_t rows) {
+    for (auto &hook : this->hooks)
+      if (hook > line)
+        hook += rows;
   }
-  if (edit->end.col < len)
-    edit->end.col = utf16_offset_to_utf8(line, len, edit->end.col);
-  else
-    edit->end.col = len;
-  free(it->buffer);
-  free(it);
-}
+
+  inline void apply_hook_deletion(uint32_t removal_start,
+                                  uint32_t removal_end) {
+    for (auto &hook : this->hooks)
+      if (hook > removal_start)
+        hook -= removal_end - removal_start + 1;
+  }
+};
 
 #endif
diff --git a/include/editor/helpers.h b/include/editor/helpers.h
index 013736e..561fcf4 100644
--- a/include/editor/helpers.h
+++ b/include/editor/helpers.h
@@ -3,24 +3,4 @@
 
 #include "editor/editor.h"
 
-void insert_str(Editor *editor, char *c, uint32_t len);
-void insert_char(Editor *editor, char c);
-void normal_mode(Editor *editor);
-void backspace_edit(Editor *editor);
-void delete_prev_word(Editor *editor);
-void delete_next_word(Editor *editor);
-void clear_hooks_at_line(Editor *editor, uint32_t line);
-void cursor_prev_word(Editor *editor);
-void cursor_next_word(Editor *editor);
-void select_all(Editor *editor);
-void fetch_lsp_hover(Editor *editor);
-void handle_mouse(Editor *editor, KeyEvent event);
-void indent_current_line(Editor *editor);
-void dedent_current_line(Editor *editor);
-void indent_selection(Editor *editor);
-void dedent_selection(Editor *editor);
-void paste(Editor *editor);
-void copy(Editor *editor);
-void cut(Editor *editor);
-
 #endif
diff --git a/include/extentions/hover.h b/include/extentions/hover.h
new file mode 100644
index 0000000..a591479
--- /dev/null
+++ b/include/extentions/hover.h
@@ -0,0 +1,31 @@
+#ifndef EXTENTION_HOVER_H
+#define EXTENTION_HOVER_H
+
+#include "io/sysio.h"
+#include "pch.h"
+#include "utils/utils.h"
+#include "windows/decl.h"
+
+TileRoot *init_hover();
+
+struct HoverBox : Window {
+  std::string text;
+  std::atomic<bool> is_markup;
+  uint32_t scroll_;
+  bool scroll_dirty;
+
+  HoverBox() : scroll_(0) { this->hidden = true; }
+  void clear() {
+    this->text = "";
+    this->hidden = true;
+    this->is_markup = false;
+    this->scroll_ = 0;
+    this->scroll_dirty = true;
+  }
+  void scroll(int32_t number);
+  void render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) override;
+  void handle_click(KeyEvent, Coord) override { this->hidden = true; };
+  ~HoverBox() {};
+};
+
+#endif
diff --git a/include/io/sysio.h b/include/io/sysio.h
index 44b1e37..b52bc62 100644
--- a/include/io/sysio.h
+++ b/include/io/sysio.h
@@ -96,19 +96,13 @@ inline bool is_empty_cell(const ScreenCell &c) {
   return c.utf8.empty() || c.utf8 == " " || c.utf8 == "\x1b";
 }
 
+extern std::vector<ScreenCell> new_screen;
+
 Coord start_screen();
 void end_screen();
-void update(uint32_t row, uint32_t col, std::string utf8, uint32_t fg,
-            uint32_t bg, uint8_t flags);
-void update(uint32_t row, uint32_t col, const char *utf8, uint32_t fg,
-            uint32_t bg, uint8_t flags);
-void update(uint32_t row, uint32_t col, std::string utf8, uint32_t fg,
-            uint32_t bg, uint8_t flags, uint32_t ul_color);
-void update(uint32_t row, uint32_t col, const char *utf8, uint32_t fg,
-            uint32_t bg, uint8_t flags, uint32_t ul_color);
 void set_cursor(uint8_t row, uint8_t col, uint32_t type,
                 bool show_cursor_param);
-void render();
+void io_render();
 Coord get_size();
 
 KeyEvent read_key();
diff --git a/include/lsp/lsp.h b/include/lsp/lsp.h
index e815bef..56db3e2 100644
--- a/include/lsp/lsp.h
+++ b/include/lsp/lsp.h
@@ -5,56 +5,20 @@
 #include "pch.h"
 #include "utils/utils.h"
 
-struct LSPPending {
-  Editor *editor = nullptr;
-  std::function<void(Editor *, const json &)> callback;
-};
+#define LSP_TIMEOUT 3000
 
-// TODO: Defer any editor mutation to main thread to get rid of
-//       all mutex locks on the editor rope.
-// struct LSPPendingResponse {
-//   LSPPending *pending = nullptr;
-//   json message;
-// };
-
-struct LSPOpenRequest {
-  Language language;
-  Editor *editor;
-};
-
-struct LSPInstance {
-  std::shared_mutex mtx;
-  const LSP *lsp;
-  std::string root_dir;
-  int pid{-1};
-  int stdin_fd{-1};
-  int stdout_fd{-1};
-  std::atomic<bool> initialized = false;
-  std::atomic<bool> exited = false;
-  bool incremental_sync = false;
-  bool allow_hover = false;
-  bool allow_completion = false;
-  bool allow_resolve = false;
-  bool allow_formatting = false;
-  bool allow_formatting_on_type = false;
-  bool is_utf8 = false;
-  std::vector<char> format_chars;
-  std::vector<char> trigger_chars;
-  std::vector<char> end_chars;
-  uint32_t last_id = 0;
-  Queue<json> inbox;
-  Queue<json> outbox;
-  Queue<std::pair<Language, Editor *>> open_queue;
-  std::unordered_map<uint32_t, LSPPending *> pending;
-  std::vector<Editor *> editors;
-};
-
-extern std::shared_mutex active_lsps_mtx;
-extern std::unordered_map<std::string, std::shared_ptr<LSPInstance>>
+namespace lsp {
+extern std::mutex lsp_mutex;
+extern std::unordered_map<std::string, std::unique_ptr<LSPInstance>>
     active_lsps;
-extern Queue<LSPOpenRequest> lsp_open_queue;
+extern Queue<std::string> need_opening;
+extern std::unordered_set<std::string> opened;
+extern std::vector<Editor *> new_editors;
+} // namespace lsp
 
-static json client_capabilities = {
+void lsp_worker();
+
+static const json client_capabilities = {
     {"general", {{"positionEncodings", {"utf-16"}}}},
     {"textDocument",
      {{"publishDiagnostics", {{"relatedInformation", true}}},
@@ -78,20 +42,403 @@ static json client_capabilities = {
         {"contextSupport", true},
         {"insertTextMode", 1}}}}}};
 
-void lsp_send(std::shared_ptr<LSPInstance> lsp, json message,
-              LSPPending *pending);
-void lsp_worker();
+struct LSPMessage {
+  Editor *editor = nullptr;
+  json message;
+  std::function<void(const LSPMessage &)> callback;
+};
 
-std::shared_ptr<LSPInstance> get_or_init_lsp(std::string lsp_id);
-void clean_lsp(std::shared_ptr<LSPInstance> lsp, std::string lsp_id);
-void close_lsp(std::string lsp_id);
-std::optional<json> read_lsp_message(int fd);
+struct LSPInstance {
+  const LSP *lsp_info;
+  std::string root_dir;
+  int pid{-1};
+  int stdin_fd{-1};
+  int stdout_fd{-1};
+  std::atomic<bool> initialized = false;
+  std::atomic<bool> exited = false;
+  bool incremental_sync = false;
+  bool allow_hover = false;
+  bool allow_completion = false;
+  bool allow_resolve = false;
+  bool allow_formatting = false;
+  bool allow_formatting_on_type = false;
+  bool is_utf8 = false;
+  std::vector<char> format_chars;
+  std::vector<char> trigger_chars;
+  std::vector<char> end_chars;
+  uint32_t last_id = 0;
+  Queue<json> inbox;
+  Queue<json> outbox;
+  std::unordered_map<uint32_t, std::unique_ptr<LSPMessage>> pending;
+  std::vector<std::unique_ptr<LSPMessage>> lsp_response_queue;
+  std::vector<Editor *> editors;
 
-void open_editor(std::shared_ptr<LSPInstance> lsp,
-                 std::pair<Language, Editor *> entry);
-void request_add_to_lsp(Language language, Editor *editor);
-void add_to_lsp(Language language, Editor *editor);
-void remove_from_lsp(Editor *editor);
-void lsp_handle(std::shared_ptr<LSPInstance> lsp, json message);
+  LSPInstance(std::string lsp_id) {
+    lsp_info = &lsps[lsp_id];
+    if (!init_process()) {
+      exited = true;
+      return;
+    }
+    json initialize_message = {
+        {"jsonrpc", "2.0"},
+        {"id", ++last_id},
+        {"method", "initialize"},
+        {"params",
+         {{"processId", getpid()},
+          {"rootUri", "file://" + percent_encode(path_abs("."))},
+          {"capabilities", client_capabilities}}}};
+    send_raw(initialize_message);
+    pollfd pfd{stdout_fd, POLLIN, 0};
+    poll(&pfd, 1, LSP_TIMEOUT);
+    if (!(pfd.revents & POLLIN)) {
+      exited = true;
+      return;
+    }
+    json response = *read_lsp_message();
+    log("Lsp response: %s", response.dump().c_str());
+    if (response.contains("result") &&
+        response["result"].contains("capabilities")) {
+      auto &caps = response["result"]["capabilities"];
+      // if (caps.contains("positionEncoding")) {
+      //   std::string s = caps["positionEncoding"].get<std::string>();
+      //   if (s == "utf-8")
+      //     is_utf8 = true;
+      //   log("Lsp name: %s, supports: %s", lsp->command.c_str(),
+      //       s.c_str());
+      // }
+      if (caps.contains("textDocumentSync")) {
+        auto &sync = caps["textDocumentSync"];
+        if (sync.is_number()) {
+          int change_type = sync.get<int>();
+          incremental_sync = (change_type == 2);
+        } else if (sync.is_object() && sync.contains("change")) {
+          int change_type = sync["change"].get<int>();
+          incremental_sync = (change_type == 2);
+        }
+      }
+      allow_formatting = caps.value("documentFormattingProvider", false);
+      if (lsp_id != "lua-language-server" /* Lua ls gives terrible ontype
+                                             formatting so disable */
+          && caps.contains("documentOnTypeFormattingProvider")) {
+        auto &fmt = caps["documentOnTypeFormattingProvider"];
+        if (fmt.is_object()) {
+          if (fmt.contains("firstTriggerCharacter")) {
+            std::string s = fmt["firstTriggerCharacter"].get<std::string>();
+            if (s.size() == 1)
+              format_chars.push_back(s[0]);
+          }
+          if (fmt.contains("moreTriggerCharacter")) {
+            for (auto &c : fmt["moreTriggerCharacter"]) {
+              std::string s = c.get<std::string>();
+              if (s.size() == 1)
+                format_chars.push_back(s[0]);
+            }
+          }
+          allow_formatting_on_type = true;
+        } else if (fmt.is_boolean()) {
+          allow_formatting_on_type = fmt.get<bool>();
+        }
+      }
+      if (caps.contains("hoverProvider")) {
+        auto &hover = caps["hoverProvider"];
+        allow_hover =
+            hover.is_boolean() ? hover.get<bool>() : hover.is_object();
+      } else {
+        allow_hover = false;
+      }
+      if (caps.contains("completionProvider")) {
+        allow_completion = true;
+        if (caps["completionProvider"].contains("resolveProvider"))
+          allow_resolve =
+              caps["completionProvider"]["resolveProvider"].get<bool>();
+        if (caps["completionProvider"].contains("triggerCharacters")) {
+          auto &chars = caps["completionProvider"]["triggerCharacters"];
+          if (chars.is_array()) {
+            for (auto &c : chars) {
+              std::string str = c.get<std::string>();
+              if (str.size() != 1)
+                continue;
+              trigger_chars.push_back(str[0]);
+            }
+          }
+        }
+        if (caps["completionProvider"].contains("allCommitCharacters")) {
+          auto &chars = caps["completionProvider"]["allCommitCharacters"];
+          if (chars.is_array()) {
+            for (auto &c : chars) {
+              std::string str = c.get<std::string>();
+              if (str.size() != 1)
+                continue;
+              end_chars.push_back(str[0]);
+            }
+          }
+        }
+      }
+    }
+    initialized = true;
+    json initialized_message = {{"jsonrpc", "2.0"},
+                                {"method", "initialized"},
+                                {"params", json::object()}};
+    send_raw(initialized_message);
+  }
+  ~LSPInstance() {
+    for (auto &ed : editors)
+      ed->lsp.store(nullptr);
+    initialized = false;
+    exited = true;
+    if (pid == -1)
+      return;
+    json shutdown = {{"id", ++last_id}, {"method", "shutdown"}};
+    send_raw(shutdown);
+    pollfd pfd{stdout_fd, POLLIN, 0};
+    poll(&pfd, 1, LSP_TIMEOUT);
+    json exit_msg = {{"method", "exit"}};
+    send_raw(exit_msg);
+    int waited = 0;
+    while (waited < LSP_TIMEOUT) {
+      int status;
+      pid_t res = waitpid(pid, &status, WNOHANG);
+      if (res == pid)
+        break;
+      std::this_thread::sleep_for(std::chrono::milliseconds(10));
+      waited += 10;
+    }
+    if (kill(pid, 0) == 0) {
+      kill(pid, SIGKILL);
+      waitpid(pid, nullptr, 0);
+    }
+    pid = -1;
+    close(stdin_fd);
+    close(stdout_fd);
+  }
+  bool init_process() {
+    int in_pipe[2];
+    int out_pipe[2];
+    if (pipe(in_pipe) == -1 || pipe(out_pipe) == -1) {
+      perror("pipe");
+      return false;
+    }
+    pid_t pid_tmp = fork();
+    if (pid_tmp == -1) {
+      perror("fork");
+      return false;
+    }
+    if (pid_tmp == 0) {
+      dup2(in_pipe[0], STDIN_FILENO);
+      dup2(out_pipe[1], STDOUT_FILENO);
+      int devnull = open("/dev/null", O_WRONLY);
+      if (devnull >= 0) {
+        dup2(devnull, STDERR_FILENO);
+        close(devnull);
+      }
+      close(in_pipe[0]);
+      close(in_pipe[1]);
+      close(out_pipe[0]);
+      close(out_pipe[1]);
+      std::vector<char *> argv;
+      argv.push_back(const_cast<char *>(lsp_info->command.c_str()));
+      for (auto &arg : lsp_info->args)
+        argv.push_back(const_cast<char *>(arg.c_str()));
+      argv.push_back(nullptr);
+      execvp(lsp_info->command.c_str(), argv.data());
+      perror("execvp");
+      _exit(127);
+    }
+    pid = pid_tmp;
+    stdin_fd = in_pipe[1];
+    stdout_fd = out_pipe[0];
+    close(in_pipe[0]);
+    close(out_pipe[1]);
+    return true;
+  }
+  void add(Editor *ed) {
+    std::unique_lock lock(lsp::lsp_mutex);
+    editors.push_back(ed);
+    lock.unlock();
+    ed->lsp.store(this);
+    char *buf = read(ed->root, 0, ed->root->char_count);
+    std::string text(buf);
+    free(buf);
+    auto message = std::make_unique<LSPMessage>();
+    message->message = {{"method", "textDocument/didOpen"},
+                        {"params",
+                         {{"textDocument",
+                           {{"uri", ed->uri},
+                            {"languageId", ed->lang.name},
+                            {"version", 1},
+                            {"text", text}}}}}};
+    send(std::move(message));
+  }
+  void remove(Editor *ed) {
+    std::unique_lock lock(lsp::lsp_mutex);
+    editors.erase(std::remove(editors.begin(), editors.end(), ed),
+                  editors.end());
+    lock.unlock();
+    auto message = std::make_unique<LSPMessage>();
+    message->message = {{"method", "textDocument/didClose"},
+                        {"params", {{"textDocument", {{"uri", ed->uri}}}}}};
+    send(std::move(message));
+  }
+  void work() {
+    if (exited)
+      return;
+    int status;
+    pid_t res = waitpid(pid, &status, WNOHANG);
+    if (res == pid) {
+      exited = true;
+      pid = -1;
+      return;
+    }
+    while (!outbox.empty()) {
+      json message = outbox.front();
+      std::string m = message.value("method", "");
+      outbox.pop();
+      send_raw(message);
+    }
+    pollfd pfd{stdout_fd, POLLIN | POLLHUP | POLLERR, 0};
+    int r = poll(&pfd, 1, 0);
+    if (r > 0 && pfd.revents & (POLLHUP | POLLERR)) {
+      exited = true;
+      pid = -1;
+      return;
+    }
+    while ((r = poll(&pfd, 1, 0)) > 0) {
+      if (pfd.revents & (POLLHUP | POLLERR)) {
+        exited = true;
+        pid = -1;
+        return;
+      }
+      auto msg = read_lsp_message();
+      if (!msg)
+        break;
+      if (msg->contains("id")) {
+        uint32_t id = msg->at("id").get<uint32_t>();
+        auto it = pending.find(id);
+        if (it != pending.end()) {
+          if (it->second->editor) {
+            it->second->message = *msg;
+            lsp_response_queue.push_back(std::move(it->second));
+          } else {
+            auto message = *std::move(it->second);
+            message.message = *msg;
+            message.callback(message);
+          }
+          pending.erase(it);
+        }
+      } else if (msg->contains("method")) {
+        std::string uri;
+        if (msg->contains("params")) {
+          auto &p = (*msg)["params"];
+          if (p.contains("textDocument") && p["textDocument"].contains("uri"))
+            uri = p["textDocument"]["uri"].get<std::string>();
+          else if (p.contains("uri"))
+            uri = p["uri"].get<std::string>();
+        }
+        Editor *ed = resolve_uri(uri);
+        auto response = std::make_unique<LSPMessage>();
+        response->editor = ed;
+        response->message = *msg;
+        response->callback = editor_handle_wrapper;
+        if (ed)
+          lsp_response_queue.push_back(std::move(response));
+        else
+          lsp_handle(*msg);
+      }
+    }
+  }
+  inline static void editor_handle_wrapper(const LSPMessage &message) {
+    message.editor->lsp_handle(message.message);
+  }
+  void callbacks() {
+    for (auto &message : lsp_response_queue)
+      message->callback(*message);
+    lsp_response_queue.clear();
+  }
+  inline void send_raw(const json &msg) {
+    std::string payload = msg.dump();
+    std::string header =
+        "Content-Length: " + std::to_string(payload.size()) + "\r\n\r\n";
+    std::string out = header + payload;
+    const char *ptr = out.data();
+    size_t remaining = out.size();
+    while (remaining > 0) {
+      ssize_t n = write(stdin_fd, ptr, remaining);
+      if (n <= 0) {
+        if (errno == EINTR)
+          continue;
+        break;
+      }
+      ptr += n;
+      remaining -= n;
+    }
+  };
+  inline std::optional<json> read_lsp_message() {
+    std::string header;
+    char c;
+    while (true) {
+      ssize_t n = read(stdout_fd, &c, 1);
+      if (n <= 0)
+        return std::nullopt;
+      header.push_back(c);
+      if (header.size() >= 4 && header.substr(header.size() - 4) == "\r\n\r\n")
+        break;
+    }
+    size_t pos = header.find("Content-Length:");
+    if (pos == std::string::npos)
+      return std::nullopt;
+    pos += strlen("Content-Length:");
+    while (pos < header.size() && std::isspace(header[pos]))
+      pos++;
+    size_t end = pos;
+    while (end < header.size() && std::isdigit(header[end]))
+      end++;
+    size_t len = std::stoul(header.substr(pos, end - pos));
+    std::string body(len, '\0');
+    size_t got = 0;
+    while (got < len) {
+      ssize_t n = read(stdout_fd, &body[got], len - got);
+      if (n <= 0)
+        return std::nullopt;
+      got += n;
+    }
+    return json::parse(body);
+  }
+  inline Editor *resolve_uri(std::string uri) {
+    if (uri.empty())
+      return nullptr;
+    for (auto &editor : editors)
+      if (editor->uri == uri)
+        return editor;
+    return nullptr;
+  }
+  inline void lsp_handle(json &message) {
+    std::string method = message.value("method", "");
+    if (method == "window/showMessage") {
+      if (message.contains("params")) {
+        auto &p = message["params"];
+        if (p.contains("message"))
+          log("%s\n", p["message"].get<std::string>().c_str());
+      }
+    } else if (method == "window/logMessage") {
+      if (message.contains("params")) {
+        auto &p = message["params"];
+        if (p.contains("message"))
+          log("%s\n", p["message"].get<std::string>().c_str());
+      }
+    }
+  }
+  void send(std::unique_ptr<LSPMessage> message) {
+    if (pid == -1)
+      return;
+    message->message["jsonrpc"] = "2.0";
+    if (message->callback)
+      message->message["id"] = ++last_id;
+    outbox.push(message->message);
+    if (!message->callback)
+      return;
+    std::lock_guard lock(lsp::lsp_mutex);
+    pending[last_id] = std::move(message);
+  }
+};
 
 #endif
diff --git a/include/main.h b/include/main.h
index cc94987..0028266 100644
--- a/include/main.h
+++ b/include/main.h
@@ -12,8 +12,11 @@
 
 extern std::atomic<bool> running;
 extern std::atomic<uint8_t> mode;
-extern std::vector<struct Editor *> editors;
-extern uint8_t current_editor;
+extern fs::path pwd;
+
+namespace ui {
 extern Bar bar;
+extern TileRoot *hover_popup;
+} // namespace ui
 
 #endif
diff --git a/include/pch.h b/include/pch.h
index 5a0c479..096ba85 100644
--- a/include/pch.h
+++ b/include/pch.h
@@ -50,6 +50,7 @@ extern "C" {
 #include <thread>
 #include <unistd.h>
 #include <unordered_map>
+#include <unordered_set>
 #include <vector>
 
 using json = nlohmann::json;
diff --git a/include/ruby/decl.h b/include/ruby/decl.h
index 203762a..6b87980 100644
--- a/include/ruby/decl.h
+++ b/include/ruby/decl.h
@@ -3,6 +3,7 @@
 
 #include "syntax/decl.h"
 #include "utils/utils.h"
+#include "windows/decl.h"
 
 namespace fs = std::filesystem;
 
@@ -45,9 +46,7 @@ bool custom_compare(mrb_value match_block, std::string state1,
 std::string parse_custom(std::vector<Token> *tokens, mrb_value parser_block,
                          const char *line, uint32_t len, std::string state,
                          uint32_t c_line);
-BarLine bar_contents(uint8_t mode, std::string lang_name, uint32_t warnings,
-                     std::string lsp_name, std::string filename,
-                     std::string foldername, uint32_t line, uint32_t max_line,
-                     uint32_t width);
+BarLine bar_contents(uint8_t mode, uint32_t width, std::string foldername,
+                     Window *window);
 
 #endif
diff --git a/include/ruby/libcrib.rb b/include/ruby/libcrib.rb
index df89757..050d887 100644
--- a/include/ruby/libcrib.rb
+++ b/include/ruby/libcrib.rb
@@ -177,7 +177,7 @@ module C
       color: 0x6e1516,
       symbol: " ",
       extensions: ["erb"],
-      lsp: "ruby-lsp"
+      lsp: "emmet-language-server"
     },
     lua: {
       color: 0x36a3d9,
@@ -331,7 +331,7 @@ module C
   @b_startup = nil
   @b_shutdown = nil
   @b_bar = proc do |info|
-    # mode, lang_name, warnings, lsp_name, filename, foldername, line, max_line, width
+    # mode, width, data[5] : strings (any data about the focused window)
     # puts info.inspect
     mode_color = 0x82AAFF
     mode_symbol = "  "
@@ -352,11 +352,15 @@ module C
       mode_color = 0xF29CC3
       mode_symbol = " "
     end
-    lang_info = C.languages[info[:lang_name]]
-    if lang_info.nil?
-      lang_info = C.languages[:default]
+    lang_info = C.languages[:default]
+    filename = ""
+    if info[:data][0] == "editor"
+      lang_info = C.languages[info[:data][2]] if info[:data][2] != ""
+      if lang_info.nil?
+        lang_info = C.languages[:default]
+      end
+      filename = File.basename(info[:data][1]) if info[:data][1] != ""
     end
-    filename = File.basename(info[:filename])
     starting = " #{mode_symbol} #{info[:mode].to_s.upcase}  #{lang_info[:symbol]} #{filename}"
     highlights = []
     highlights << { fg: 0x0b0e14, bg: mode_color, flags: 1 << 1, start: 0, length: 10 }
diff --git a/include/ruby/ruby_compiled.h b/include/ruby/ruby_compiled.h
index 62e4ad4..80cef00 100644
--- a/include/ruby/ruby_compiled.h
+++ b/include/ruby/ruby_compiled.h
@@ -1,8 +1,8 @@
 #pragma once
 constexpr unsigned char _tmp___crib_precompiled_mrb[] = {
-  0x52, 0x49, 0x54, 0x45, 0x30, 0x34, 0x30, 0x30, 0x00, 0x00, 0x2b, 0xbe,
+  0x52, 0x49, 0x54, 0x45, 0x30, 0x34, 0x30, 0x30, 0x00, 0x00, 0x2c, 0x1d,
   0x4d, 0x41, 0x54, 0x5a, 0x30, 0x30, 0x30, 0x30, 0x49, 0x52, 0x45, 0x50,
-  0x00, 0x00, 0x2a, 0x2a, 0x30, 0x34, 0x30, 0x30, 0x00, 0x00, 0x00, 0xa2,
+  0x00, 0x00, 0x2a, 0x89, 0x30, 0x34, 0x30, 0x30, 0x00, 0x00, 0x00, 0xa2,
   0x00, 0x01, 0x00, 0x03, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3a,
   0x11, 0x01, 0x68, 0x01, 0x00, 0x69, 0x01, 0x00, 0x6b, 0x01, 0x01, 0x01,
   0x11, 0x01, 0x68, 0x01, 0x02, 0x69, 0x01, 0x02, 0x11, 0x01, 0x68, 0x01,
@@ -301,7 +301,7 @@ constexpr unsigned char _tmp___crib_precompiled_mrb[] = {
   0x05, 0x5c, 0x21, 0x0f, 0x5e, 0x1a, 0x04, 0x10, 0x1b, 0x12, 0x10, 0x1c,
   0x02, 0x0f, 0x1d, 0x00, 0x6e, 0x15, 0x16, 0x10, 0x1e, 0x03, 0x5c, 0x1f,
   0x38, 0x10, 0x20, 0x04, 0x5c, 0x21, 0x42, 0x52, 0x21, 0x01, 0x10, 0x22,
-  0x05, 0x5c, 0x23, 0x08, 0x5e, 0x1c, 0x04, 0x10, 0x1d, 0x13, 0x10, 0x1e,
+  0x05, 0x5c, 0x23, 0x15, 0x5e, 0x1c, 0x04, 0x10, 0x1d, 0x13, 0x10, 0x1e,
   0x02, 0x0f, 0x1f, 0x00, 0x36, 0xa3, 0xd9, 0x10, 0x20, 0x03, 0x5c, 0x21,
   0x43, 0x10, 0x22, 0x04, 0x5c, 0x23, 0x44, 0x52, 0x23, 0x01, 0x10, 0x24,
   0x05, 0x5c, 0x25, 0x17, 0x5e, 0x1e, 0x04, 0x10, 0x1f, 0x14, 0x10, 0x20,
@@ -576,8 +576,8 @@ constexpr unsigned char _tmp___crib_precompiled_mrb[] = {
   0x63, 0x6f, 0x70, 0x79, 0x00, 0x00, 0x08, 0x40, 0x62, 0x5f, 0x70, 0x61,
   0x73, 0x74, 0x65, 0x00, 0x00, 0x0e, 0x40, 0x62, 0x5f, 0x66, 0x69, 0x6c,
   0x65, 0x5f, 0x64, 0x65, 0x74, 0x65, 0x63, 0x74, 0x00, 0x00, 0x00, 0x03,
-  0x55, 0x00, 0x09, 0x00, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
-  0x1f, 0x39, 0x04, 0x00, 0x00, 0x0f, 0x03, 0x00, 0x82, 0xaa, 0xff, 0x5c,
+  0xb4, 0x00, 0x09, 0x00, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
+  0x7b, 0x39, 0x04, 0x00, 0x00, 0x0f, 0x03, 0x00, 0x82, 0xaa, 0xff, 0x5c,
   0x04, 0x00, 0x01, 0x09, 0x01, 0x10, 0x0a, 0x00, 0x23, 0x09, 0x10, 0x0a,
   0x01, 0x01, 0x0b, 0x09, 0x32, 0x0a, 0x02, 0x01, 0x28, 0x0a, 0x00, 0x0c,
   0x0f, 0x03, 0x00, 0x82, 0xaa, 0xff, 0x5c, 0x04, 0x01, 0x26, 0x00, 0x68,
@@ -590,263 +590,256 @@ constexpr unsigned char _tmp___crib_precompiled_mrb[] = {
   0x5c, 0x04, 0x04, 0x26, 0x00, 0x1a, 0x10, 0x0a, 0x06, 0x01, 0x0b, 0x09,
   0x32, 0x0a, 0x02, 0x01, 0x28, 0x0a, 0x00, 0x0c, 0x0f, 0x03, 0x00, 0xf2,
   0x9c, 0xc3, 0x5c, 0x04, 0x05, 0x26, 0x00, 0x00, 0x1d, 0x09, 0x07, 0x33,
-  0x09, 0x08, 0x01, 0x0a, 0x01, 0x10, 0x0b, 0x09, 0x23, 0x0a, 0x23, 0x09,
-  0x01, 0x05, 0x09, 0x01, 0x09, 0x05, 0x29, 0x09, 0x00, 0x03, 0x26, 0x00,
-  0x0e, 0x1d, 0x09, 0x07, 0x33, 0x09, 0x08, 0x10, 0x0a, 0x0a, 0x23, 0x09,
-  0x01, 0x05, 0x09, 0x1d, 0x09, 0x0b, 0x01, 0x0a, 0x01, 0x10, 0x0b, 0x0c,
-  0x23, 0x0a, 0x32, 0x09, 0x0d, 0x01, 0x01, 0x06, 0x09, 0x5c, 0x09, 0x06,
-  0x01, 0x0a, 0x04, 0x5d, 0x09, 0x5c, 0x0a, 0x06, 0x5d, 0x09, 0x01, 0x0a,
-  0x01, 0x10, 0x0b, 0x00, 0x23, 0x0a, 0x33, 0x0a, 0x0e, 0x33, 0x0a, 0x0f,
-  0x5d, 0x09, 0x5c, 0x0a, 0x07, 0x5d, 0x09, 0x01, 0x0a, 0x05, 0x10, 0x0b,
-  0x10, 0x23, 0x0a, 0x5d, 0x09, 0x5c, 0x0a, 0x06, 0x5d, 0x09, 0x01, 0x0a,
-  0x06, 0x5d, 0x09, 0x5c, 0x0a, 0x08, 0x5d, 0x09, 0x01, 0x07, 0x09, 0x52,
-  0x08, 0x00, 0x01, 0x09, 0x08, 0x10, 0x0a, 0x11, 0x0f, 0x0b, 0x00, 0x0b,
-  0x0e, 0x14, 0x10, 0x0c, 0x12, 0x01, 0x0d, 0x03, 0x10, 0x0e, 0x13, 0x08,
-  0x0f, 0x10, 0x10, 0x14, 0x06, 0x11, 0x10, 0x12, 0x15, 0x03, 0x13, 0x0a,
-  0x5e, 0x0a, 0x05, 0x32, 0x09, 0x16, 0x01, 0x01, 0x09, 0x08, 0x10, 0x0a,
-  0x11, 0x01, 0x0b, 0x03, 0x10, 0x0c, 0x12, 0x0f, 0x0d, 0x00, 0x33, 0x36,
-  0x3c, 0x10, 0x0e, 0x14, 0x03, 0x0f, 0x0a, 0x10, 0x10, 0x15, 0x07, 0x11,
-  0x5e, 0x0a, 0x04, 0x32, 0x09, 0x16, 0x01, 0x01, 0x09, 0x08, 0x10, 0x0a,
-  0x11, 0x0f, 0x0b, 0x00, 0x33, 0x36, 0x3c, 0x10, 0x0c, 0x12, 0x0f, 0x0d,
-  0x00, 0x24, 0x27, 0x2d, 0x10, 0x0e, 0x14, 0x03, 0x0f, 0x0b, 0x10, 0x10,
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@@ -854,85 +847,100 @@ constexpr unsigned char _tmp___crib_precompiled_mrb[] = {
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+  0x00, 0x00, 0x04, 0x46, 0x69, 0x6c, 0x65, 0x00, 0x00, 0x01, 0x43, 0x00,
+  0x00, 0x0b, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x5f, 0x66, 0x69, 0x6c,
+  0x65, 0x00, 0x00, 0x07, 0x64, 0x69, 0x72, 0x6e, 0x61, 0x6d, 0x65, 0x00,
+  0x00, 0x0b, 0x65, 0x78, 0x70, 0x61, 0x6e, 0x64, 0x5f, 0x70, 0x61, 0x74,
+  0x68, 0x00, 0x00, 0x07, 0x24, 0x4c, 0x4f, 0x41, 0x44, 0x45, 0x44, 0x00,
+  0x00, 0x08, 0x69, 0x6e, 0x63, 0x6c, 0x75, 0x64, 0x65, 0x3f, 0x00, 0x00,
+  0x02, 0x3c, 0x3c, 0x00, 0x00, 0x04, 0x72, 0x65, 0x61, 0x64, 0x00, 0x00,
+  0x09, 0x24, 0x42, 0x49, 0x4e, 0x44, 0x5f, 0x54, 0x4f, 0x50, 0x00, 0x00,
+  0x04, 0x65, 0x76, 0x61, 0x6c, 0x00, 0x00, 0x00, 0x00, 0xd3, 0x00, 0x04,
+  0x00, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0x39, 0x04,
+  0x20, 0x00, 0x26, 0x00, 0x03, 0x26, 0x00, 0x02, 0x11, 0x02, 0x01, 0x04,
+  0x01, 0x5c, 0x05, 0x00, 0x32, 0x04, 0x00, 0x01, 0x27, 0x04, 0x00, 0x0b,
+  0x01, 0x04, 0x01, 0x5c, 0x05, 0x00, 0x45, 0x04, 0x01, 0x01, 0x04, 0x1d,
+  0x04, 0x01, 0x01, 0x05, 0x01, 0x1d, 0x06, 0x01, 0x1d, 0x07, 0x02, 0x33,
+  0x07, 0x03, 0x32, 0x06, 0x04, 0x01, 0x32, 0x04, 0x05, 0x02, 0x01, 0x01,
+  0x04, 0x15, 0x04, 0x06, 0x01, 0x05, 0x01, 0x32, 0x04, 0x07, 0x01, 0x01,
+  0x05, 0x01, 0x01, 0x06, 0x02, 0x2f, 0x04, 0x08, 0x02, 0x3d, 0x04, 0x00,
+  0x01, 0x00, 0x00, 0x03, 0x2e, 0x72, 0x62, 0x00, 0x00, 0x09, 0x00, 0x09,
+  0x65, 0x6e, 0x64, 0x5f, 0x77, 0x69, 0x74, 0x68, 0x3f, 0x00, 0x00, 0x04,
+  0x46, 0x69, 0x6c, 0x65, 0x00, 0x00, 0x01, 0x43, 0x00, 0x00, 0x0b, 0x63,
+  0x6f, 0x6e, 0x66, 0x69, 0x67, 0x5f, 0x66, 0x69, 0x6c, 0x65, 0x00, 0x00,
+  0x07, 0x64, 0x69, 0x72, 0x6e, 0x61, 0x6d, 0x65, 0x00, 0x00, 0x0b, 0x65,
+  0x78, 0x70, 0x61, 0x6e, 0x64, 0x5f, 0x70, 0x61, 0x74, 0x68, 0x00, 0x00,
+  0x07, 0x24, 0x4c, 0x4f, 0x41, 0x44, 0x45, 0x44, 0x00, 0x00, 0x06, 0x64,
+  0x65, 0x6c, 0x65, 0x74, 0x65, 0x00, 0x00, 0x10, 0x72, 0x65, 0x71, 0x75,
+  0x69, 0x72, 0x65, 0x5f, 0x72, 0x65, 0x6c, 0x61, 0x74, 0x69, 0x76, 0x65,
+  0x00, 0x4c, 0x56, 0x41, 0x52, 0x00, 0x00, 0x01, 0x78, 0x00, 0x00, 0x00,
+  0x1d, 0x00, 0x03, 0x63, 0x6d, 0x64, 0x00, 0x04, 0x74, 0x65, 0x78, 0x74,
+  0x00, 0x01, 0x66, 0x00, 0x07, 0x65, 0x6e, 0x63, 0x6f, 0x64, 0x65, 0x64,
+  0x00, 0x04, 0x69, 0x6e, 0x66, 0x6f, 0x00, 0x0a, 0x6d, 0x6f, 0x64, 0x65,
+  0x5f, 0x63, 0x6f, 0x6c, 0x6f, 0x72, 0x00, 0x0b, 0x6d, 0x6f, 0x64, 0x65,
+  0x5f, 0x73, 0x79, 0x6d, 0x62, 0x6f, 0x6c, 0x00, 0x09, 0x6c, 0x61, 0x6e,
+  0x67, 0x5f, 0x69, 0x6e, 0x66, 0x6f, 0x00, 0x08, 0x66, 0x69, 0x6c, 0x65,
+  0x6e, 0x61, 0x6d, 0x65, 0x00, 0x08, 0x73, 0x74, 0x61, 0x72, 0x74, 0x69,
+  0x6e, 0x67, 0x00, 0x0a, 0x68, 0x69, 0x67, 0x68, 0x6c, 0x69, 0x67, 0x68,
+  0x74, 0x73, 0x00, 0x04, 0x74, 0x79, 0x70, 0x65, 0x00, 0x0a, 0x66, 0x69,
+  0x72, 0x73, 0x74, 0x5f, 0x6c, 0x69, 0x6e, 0x65, 0x00, 0x07, 0x73, 0x68,
+  0x65, 0x62, 0x61, 0x6e, 0x67, 0x00, 0x08, 0x6d, 0x69, 0x6d, 0x65, 0x74,
+  0x79, 0x70, 0x65, 0x00, 0x05, 0x62, 0x6c, 0x6f, 0x63, 0x6b, 0x00, 0x05,
+  0x6d, 0x6f, 0x64, 0x65, 0x73, 0x00, 0x04, 0x6b, 0x65, 0x79, 0x73, 0x00,
+  0x06, 0x61, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x00, 0x03, 0x61, 0x70, 0x70,
+  0x00, 0x03, 0x64, 0x73, 0x6c, 0x00, 0x01, 0x6b, 0x00, 0x03, 0x61, 0x63,
+  0x74, 0x00, 0x03, 0x62, 0x6c, 0x6b, 0x00, 0x04, 0x6d, 0x6f, 0x64, 0x65,
+  0x00, 0x03, 0x6b, 0x65, 0x79, 0x00, 0x04, 0x70, 0x61, 0x74, 0x68, 0x00,
+  0x04, 0x62, 0x69, 0x6e, 0x64, 0x00, 0x04, 0x63, 0x6f, 0x64, 0x65, 0x00,
+  0x00, 0xff, 0xff, 0x00, 0x01, 0xff, 0xff, 0x00, 0x02, 0xff, 0xff, 0x00,
+  0x02, 0xff, 0xff, 0x00, 0x02, 0xff, 0xff, 0x00, 0x02, 0xff, 0xff, 0x00,
+  0x02, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01, 0xff, 0xff, 0x00, 0x03, 0x00,
+  0x04, 0xff, 0xff, 0x00, 0x05, 0x00, 0x06, 0x00, 0x07, 0x00, 0x08, 0x00,
+  0x09, 0x00, 0x0a, 0x00, 0x01, 0xff, 0xff, 0xff, 0xff, 0x00, 0x08, 0xff,
+  0xff, 0x00, 0x0b, 0x00, 0x0c, 0x00, 0x0d, 0x00, 0x0e, 0xff, 0xff, 0x00,
+  0x0f, 0xff, 0xff, 0x00, 0x0f, 0xff, 0xff, 0x00, 0x0f, 0xff, 0xff, 0x00,
+  0x0f, 0xff, 0xff, 0x00, 0x0f, 0xff, 0xff, 0x00, 0x0f, 0xff, 0xff, 0x00,
+  0x0f, 0x00, 0x10, 0x00, 0x11, 0x00, 0x12, 0xff, 0xff, 0x00, 0x0f, 0x00,
+  0x13, 0x00, 0x14, 0x00, 0x15, 0x00, 0x16, 0xff, 0xff, 0x00, 0x17, 0x00,
+  0x18, 0xff, 0xff, 0x00, 0x19, 0xff, 0xff, 0x00, 0x18, 0xff, 0xff, 0x00,
+  0x19, 0xff, 0xff, 0x00, 0x1a, 0x00, 0x1b, 0xff, 0xff, 0x00, 0x1c, 0x00,
+  0x1a, 0x00, 0x1b, 0xff, 0xff, 0x45, 0x4e, 0x44, 0x00, 0x00, 0x00, 0x00,
+  0x08
 };
-constexpr unsigned int _tmp___crib_precompiled_mrb_len = 11198;
+constexpr unsigned int _tmp___crib_precompiled_mrb_len = 11293;
diff --git a/include/tiling/decl.h b/include/tiling/decl.h
deleted file mode 100644
index 18575ec..0000000
--- a/include/tiling/decl.h
+++ /dev/null
@@ -1,10 +0,0 @@
-#ifndef TILING_DECL_H
-#define TILING_DECL_H
-
-#include "utils/utils.h"
-
-struct Window {};
-
-struct TileBlock {};
-
-#endif
diff --git a/include/ui/bar.h b/include/ui/bar.h
index 61f4f06..84e1f5f 100644
--- a/include/ui/bar.h
+++ b/include/ui/bar.h
@@ -12,8 +12,9 @@ struct Bar {
   uint32_t cursor = 0;
 
   void init(Coord screen) { this->screen = screen; }
-  void render();
-  void handle(KeyEvent event);
+  void render(std::vector<ScreenCell> &buffer);
+  void handle_event(KeyEvent event);
+  void handle_command(std::string &command);
   void log(std::string message);
 };
 
diff --git a/include/ui/completionbox.h b/include/ui/completionbox.h
index a99f4c7..917d602 100644
--- a/include/ui/completionbox.h
+++ b/include/ui/completionbox.h
@@ -1,21 +1,21 @@
-#ifndef UI_COMPLETIONBOX_H
-#define UI_COMPLETIONBOX_H
-
-#include "io/sysio.h"
-#include "pch.h"
-#include "utils/utils.h"
-
-struct CompletionBox {
-  std::shared_mutex mtx;
-  struct CompletionSession *session;
-  bool hidden = true;
-  std::vector<ScreenCell> cells;
-  Coord size;
-  Coord position;
-
-  CompletionBox(CompletionSession *s) : session(s) {}
-  void render_update();
-  void render(Coord pos);
-};
-
-#endif
+// #ifndef UI_COMPLETIONBOX_H
+// #define UI_COMPLETIONBOX_H
+//
+// #include "io/sysio.h"
+// #include "pch.h"
+// #include "utils/utils.h"
+//
+// struct CompletionBox {
+//   std::shared_mutex mtx;
+//   struct CompletionSession *session;
+//   bool hidden = true;
+//   std::vector<ScreenCell> cells;
+//   Coord size;
+//   Coord position;
+//
+//   CompletionBox(CompletionSession *s) : session(s) {}
+//   void render_update();
+//   void render(Coord pos);
+// };
+//
+// #endif
diff --git a/include/ui/hover.h b/include/ui/hover.h
deleted file mode 100644
index 3255281..0000000
--- a/include/ui/hover.h
+++ /dev/null
@@ -1,22 +0,0 @@
-#ifndef UI_HOVER_H
-#define UI_HOVER_H
-
-#include "editor/decl.h"
-#include "io/sysio.h"
-#include "pch.h"
-#include "utils/utils.h"
-
-struct HoverBox {
-  std::string text;
-  std::atomic<bool> is_markup;
-  uint32_t scroll_;
-  std::vector<ScreenCell> cells;
-  Coord size;
-
-  void clear();
-  void scroll(int32_t number);
-  void render_first(bool scroll = false);
-  void render(Coord pos);
-};
-
-#endif
diff --git a/include/windows/decl.h b/include/windows/decl.h
new file mode 100644
index 0000000..26fd310
--- /dev/null
+++ b/include/windows/decl.h
@@ -0,0 +1,120 @@
+#ifndef TILING_DECL_H
+#define TILING_DECL_H
+
+#include "io/sysio.h"
+#include "utils/utils.h"
+
+struct Tile {
+  bool hidden = false;
+  uint32_t weight = 100;
+
+  virtual void render(std::vector<ScreenCell> &buffer, Coord size,
+                      Coord pos) = 0;
+  virtual void handle_click(KeyEvent event, Coord size) = 0;
+  virtual ~Tile() = default;
+};
+
+struct Window : Tile {
+  virtual ~Window() = default;
+  virtual void handle_event(KeyEvent){};
+  virtual void handle_command(std::string &) {};
+  virtual void work() {};
+  virtual std::array<std::string, 5> bar_info() { return {}; };
+};
+
+struct TileBlock : Tile {
+  bool vertical;
+  std::vector<std::unique_ptr<Tile>> tiles;
+
+  void render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) override {
+    uint32_t total_weight = 0;
+    for (auto &t : tiles) {
+      if (!t->hidden)
+        total_weight += t->weight;
+    }
+    if (total_weight == 0)
+      return;
+    for (auto &t : tiles) {
+      if (t->hidden)
+        continue;
+      uint32_t proportion =
+          t->weight * (vertical ? size.row : size.col) / total_weight;
+      Coord tile_size = vertical ? Coord{.row = proportion, .col = size.col}
+                                 : Coord{.row = size.row, .col = proportion};
+      t->render(buffer, tile_size, pos);
+      if (vertical)
+        pos.row += tile_size.row;
+      else
+        pos.col += tile_size.col;
+    }
+  }
+
+  void handle_click(KeyEvent event, Coord size) override {
+    uint32_t total_weight = 0;
+    for (auto &t : tiles)
+      if (!t->hidden)
+        total_weight += t->weight;
+    if (total_weight == 0)
+      return;
+    uint32_t i = 0;
+    for (auto &t : tiles) {
+      if (t->hidden)
+        continue;
+      uint32_t proportion =
+          t->weight * (vertical ? size.row : size.col) / total_weight;
+      Coord tile_size = vertical ? Coord{.row = proportion, .col = size.col}
+                                 : Coord{.row = size.row, .col = proportion};
+      if (vertical) {
+        if (event.mouse_y < i + proportion) {
+          event.mouse_y -= i;
+          t->handle_click(event, tile_size);
+          return;
+        }
+      } else {
+        if (event.mouse_x < i + proportion) {
+          event.mouse_x -= i;
+          t->handle_click(event, tile_size);
+          return;
+        }
+      }
+      i += proportion;
+    }
+  }
+};
+
+struct TileRoot {
+  std::unique_ptr<Tile> tile;
+  Coord pos;
+  Coord size;
+
+  void render(std::vector<ScreenCell> &buffer) {
+    if (this->tile->hidden)
+      return;
+    this->tile->render(buffer, size, pos);
+  }
+  void handle_click(KeyEvent event) {
+    event.mouse_x -= this->pos.col;
+    event.mouse_y -= this->pos.row;
+    this->tile->handle_click(event, size);
+  }
+  bool inside(uint32_t x, uint32_t y) {
+    return x >= pos.col && x < pos.col + size.col && y >= pos.row &&
+           y < pos.row + size.row;
+  }
+};
+
+extern TileRoot root_tile;
+extern std::vector<std::unique_ptr<TileRoot>> popups;
+extern Window *focused_window;
+
+inline void close_popup(TileRoot *handle) {
+  auto it = std::find_if(popups.begin(), popups.end(),
+                         [handle](const auto &p) { return p.get() == handle; });
+  if (it != popups.end())
+    popups.erase(it);
+}
+
+void render();
+void handle_click(KeyEvent event);
+
+#endif
diff --git a/samples/bash.sh b/samples/bash.sh
index f65dcec..2b3c4c9 100644
--- a/samples/bash.sh
+++ b/samples/bash.sh
@@ -25,6 +25,7 @@ colorize() {
 handle_error() {
   log ERROR "An error occurred on line $1"
 }
+
 trap 'handle_error $LINENO' ERR
 # Multiline string test
 read -r -d '' MULTI <<'CPP'
diff --git a/src/editor/adjustment.cc b/src/editor/adjustment.cc
index 8ca1ffe..5304af1 100644
--- a/src/editor/adjustment.cc
+++ b/src/editor/adjustment.cc
@@ -1,25 +1,24 @@
 #include "editor/editor.h"
 
-void ensure_cursor(Editor *editor) {
-  std::shared_lock knot_lock(editor->knot_mtx);
-  if (editor->cursor < editor->scroll) {
-    editor->cursor.row = editor->scroll.row;
-    editor->cursor.col = editor->scroll.col;
-    editor->cursor_preffered = UINT32_MAX;
+void Editor::ensure_cursor() {
+  if (this->cursor < this->scroll) {
+    this->cursor.row = this->scroll.row;
+    this->cursor.col = this->scroll.col;
+    this->cursor_preffered = UINT32_MAX;
     return;
   }
   uint32_t numlen =
-      EXTRA_META + static_cast<int>(std::log10(editor->root->line_count + 1));
-  uint32_t render_width = editor->size.col - numlen;
+      EXTRA_META + static_cast<int>(std::log10(this->root->line_count + 1));
+  uint32_t render_width = this->size.col - numlen;
   uint32_t visual_rows = 0;
-  uint32_t line_index = editor->scroll.row;
+  uint32_t line_index = this->scroll.row;
   bool first_visual_line = true;
-  LineIterator *it = begin_l_iter(editor->root, line_index);
+  LineIterator *it = begin_l_iter(this->root, line_index);
   if (!it)
     return;
-  Coord last_visible = editor->scroll;
+  Coord last_visible = this->scroll;
   while (true) {
-    if (visual_rows >= editor->size.row)
+    if (visual_rows >= this->size.row)
       break;
     uint32_t line_len;
     char *line = next_line(it, &line_len);
@@ -27,13 +26,13 @@ void ensure_cursor(Editor *editor) {
       break;
     if (line_len > 0 && line[line_len - 1] == '\n')
       line_len--;
-    uint32_t offset = first_visual_line ? editor->scroll.col : 0;
+    uint32_t offset = first_visual_line ? this->scroll.col : 0;
     first_visual_line = false;
     while (offset < line_len || (line_len == 0 && offset == 0)) {
       Coord current = {line_index, offset};
       last_visible = current;
       visual_rows++;
-      if (visual_rows >= editor->size.row)
+      if (visual_rows >= this->size.row)
         break;
       uint32_t col = 0;
       uint32_t advance = 0;
@@ -48,9 +47,9 @@ void ensure_cursor(Editor *editor) {
         left -= g;
         col += w;
       }
-      if (line_index == editor->cursor.row) {
-        if (editor->cursor.col >= offset &&
-            editor->cursor.col <= offset + advance) {
+      if (line_index == this->cursor.row) {
+        if (this->cursor.col >= offset &&
+            this->cursor.col <= offset + advance) {
           free(it->buffer);
           free(it);
           return;
@@ -64,20 +63,19 @@ void ensure_cursor(Editor *editor) {
     }
     line_index++;
   }
-  editor->cursor.row = last_visible.row;
-  editor->cursor.col = last_visible.col;
-  editor->cursor_preffered = UINT32_MAX;
+  this->cursor.row = last_visible.row;
+  this->cursor.col = last_visible.col;
+  this->cursor_preffered = UINT32_MAX;
   free(it->buffer);
   free(it);
 }
 
-void ensure_scroll(Editor *editor) {
-  std::shared_lock knot_lock(editor->knot_mtx);
+void Editor::ensure_scroll() {
   uint32_t numlen =
-      EXTRA_META + static_cast<int>(std::log10(editor->root->line_count + 1));
-  uint32_t render_width = editor->size.col - numlen;
-  if (editor->cursor < editor->scroll) {
-    LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+      EXTRA_META + static_cast<int>(std::log10(this->root->line_count + 1));
+  uint32_t render_width = this->size.col - numlen;
+  if (this->cursor < this->scroll) {
+    LineIterator *it = begin_l_iter(this->root, this->cursor.row);
     if (!it)
       return;
     uint32_t len;
@@ -98,9 +96,9 @@ void ensure_scroll(Editor *editor) {
       int width = display_width(line + offset, inc);
       if (cols + width > render_width) {
         cols = 0;
-        if (editor->cursor.col > old_offset && editor->cursor.col <= offset) {
-          editor->scroll.row = editor->cursor.row;
-          editor->scroll.col = old_offset;
+        if (this->cursor.col > old_offset && this->cursor.col <= offset) {
+          this->scroll.row = this->cursor.row;
+          this->scroll.col = old_offset;
           free(it->buffer);
           free(it);
           return;
@@ -112,14 +110,14 @@ void ensure_scroll(Editor *editor) {
     }
     free(it->buffer);
     free(it);
-    editor->scroll.row = editor->cursor.row;
-    editor->scroll.col = (editor->cursor.col == 0) ? 0 : old_offset;
-  } else if (editor->cursor.row - editor->scroll.row < editor->size.row * 2) {
-    uint32_t line_index = editor->scroll.row;
-    LineIterator *it = begin_l_iter(editor->root, line_index);
+    this->scroll.row = this->cursor.row;
+    this->scroll.col = (this->cursor.col == 0) ? 0 : old_offset;
+  } else if (this->cursor.row - this->scroll.row < this->size.row * 2) {
+    uint32_t line_index = this->scroll.row;
+    LineIterator *it = begin_l_iter(this->root, line_index);
     if (!it)
       return;
-    uint32_t max_visual_lines = editor->size.row;
+    uint32_t max_visual_lines = this->size.row;
     Coord *scroll_queue = (Coord *)malloc(sizeof(Coord) * max_visual_lines);
     uint32_t q_head = 0;
     uint32_t q_size = 0;
@@ -133,7 +131,7 @@ void ensure_scroll(Editor *editor) {
         line_len--;
       uint32_t current_byte_offset = 0;
       if (first_visual_line) {
-        current_byte_offset += editor->scroll.col;
+        current_byte_offset += this->scroll.col;
         first_visual_line = false;
       }
       while (current_byte_offset < line_len ||
@@ -160,16 +158,16 @@ void ensure_scroll(Editor *editor) {
           line_left -= cluster_len;
           col += width;
         }
-        if (line_index == editor->cursor.row) {
+        if (line_index == this->cursor.row) {
           bool cursor_found = false;
-          if (editor->cursor.col >= current_byte_offset &&
-              editor->cursor.col < current_byte_offset + local_render_offset)
+          if (this->cursor.col >= current_byte_offset &&
+              this->cursor.col < current_byte_offset + local_render_offset)
             cursor_found = true;
-          else if (editor->cursor.col == line_len &&
+          else if (this->cursor.col == line_len &&
                    current_byte_offset + local_render_offset == line_len)
             cursor_found = true;
           if (cursor_found) {
-            editor->scroll = scroll_queue[q_head];
+            this->scroll = scroll_queue[q_head];
             free(scroll_queue);
             free(it->buffer);
             free(it);
@@ -186,10 +184,10 @@ void ensure_scroll(Editor *editor) {
     free(it->buffer);
     free(it);
   } else {
-    editor->scroll.row = (editor->cursor.row > editor->size.row * 1.5)
-                             ? editor->cursor.row - editor->size.row * 1.5
-                             : 0;
-    editor->scroll.col = 0;
-    ensure_scroll(editor);
+    this->scroll.row = (this->cursor.row > this->size.row * 1.5)
+                           ? this->cursor.row - this->size.row * 1.5
+                           : 0;
+    this->scroll.col = 0;
+    this->ensure_scroll();
   }
 }
diff --git a/src/editor/boundaries.cc b/src/editor/boundaries.cc
index c9182d1..dd848c9 100644
--- a/src/editor/boundaries.cc
+++ b/src/editor/boundaries.cc
@@ -32,12 +32,9 @@ uint32_t scan_right(const char *line, uint32_t len, uint32_t off) {
   return i;
 }
 
-void word_boundaries_exclusive(Editor *editor, Coord coord, uint32_t *prev_col,
-                               uint32_t *next_col) {
-  if (!editor)
-    return;
-  std::shared_lock lock(editor->knot_mtx);
-  LineIterator *it = begin_l_iter(editor->root, coord.row);
+void Editor::word_boundaries_exclusive(Coord coord, uint32_t *prev_col,
+                                       uint32_t *next_col) {
+  LineIterator *it = begin_l_iter(this->root, coord.row);
   if (!it)
     return;
   uint32_t line_len;
@@ -85,13 +82,10 @@ uint32_t word_jump_left(const char *line, size_t len, uint32_t col) {
   return static_cast<uint32_t>(last);
 }
 
-void word_boundaries(Editor *editor, Coord coord, uint32_t *prev_col,
-                     uint32_t *next_col, uint32_t *prev_clusters,
-                     uint32_t *next_clusters) {
-  if (!editor)
-    return;
-  std::shared_lock lock(editor->knot_mtx);
-  LineIterator *it = begin_l_iter(editor->root, coord.row);
+void Editor::word_boundaries(Coord coord, uint32_t *prev_col,
+                             uint32_t *next_col, uint32_t *prev_clusters,
+                             uint32_t *next_clusters) {
+  LineIterator *it = begin_l_iter(this->root, coord.row);
   if (!it)
     return;
   uint32_t line_len;
diff --git a/src/editor/click.cc b/src/editor/click.cc
index a76016d..aba4047 100644
--- a/src/editor/click.cc
+++ b/src/editor/click.cc
@@ -1,23 +1,22 @@
 #include "editor/editor.h"
 #include "main.h"
 
-Coord editor_hit_test(Editor *editor, uint32_t x, uint32_t y) {
+Coord Editor::click_coord(uint32_t x, uint32_t y) {
   if (mode == INSERT)
     x++;
   uint32_t numlen =
-      EXTRA_META + static_cast<int>(std::log10(editor->root->line_count + 1));
-  uint32_t render_width = editor->size.col - numlen;
+      EXTRA_META + static_cast<int>(std::log10(this->root->line_count + 1));
+  uint32_t render_width = this->size.col - numlen;
   x = MAX(x, numlen) - numlen + 1;
   uint32_t target_visual_row = y;
   uint32_t visual_row = 0;
-  uint32_t line_index = editor->scroll.row;
-  uint32_t last_line_index = editor->scroll.row;
-  uint32_t last_col = editor->scroll.col;
+  uint32_t line_index = this->scroll.row;
+  uint32_t last_line_index = this->scroll.row;
+  uint32_t last_col = this->scroll.col;
   bool first_visual_line = true;
-  std::shared_lock knot_lock(editor->knot_mtx);
-  LineIterator *it = begin_l_iter(editor->root, line_index);
+  LineIterator *it = begin_l_iter(this->root, line_index);
   if (!it)
-    return editor->scroll;
+    return this->scroll;
   while (visual_row <= target_visual_row) {
     uint32_t line_len;
     char *line = next_line(it, &line_len);
@@ -27,7 +26,7 @@ Coord editor_hit_test(Editor *editor, uint32_t x, uint32_t y) {
       line_len--;
     last_line_index = line_index;
     last_col = line_len;
-    uint32_t offset = first_visual_line ? editor->scroll.col : 0;
+    uint32_t offset = first_visual_line ? this->scroll.col : 0;
     first_visual_line = false;
     while (offset < line_len || (line_len == 0 && offset == 0)) {
       uint32_t col = 0;
diff --git a/src/editor/commands.cc b/src/editor/commands.cc
new file mode 100644
index 0000000..62984c5
--- /dev/null
+++ b/src/editor/commands.cc
@@ -0,0 +1,13 @@
+#include "editor/editor.h"
+#include "main.h"
+
+void Editor::handle_command(std::string &command) {
+  if (command == "w") {
+    this->save();
+  }
+  if (command == "wq") {
+    this->save();
+    command = "q";
+    ui::bar.handle_command(command);
+  }
+}
diff --git a/src/editor/completions.cc b/src/editor/completions.cc
index ee2f065..0a613fd 100644
--- a/src/editor/completions.cc
+++ b/src/editor/completions.cc
@@ -1,459 +1,458 @@
-#include "editor/decl.h"
-#include "editor/editor.h"
-#include "io/knot.h"
-#include "io/sysio.h"
-#include "lsp/lsp.h"
-#include "main.h"
-#include "utils/utils.h"
-
-inline static std::string completion_prefix(Editor *editor) {
-  Coord hook = editor->completion.hook;
-  Coord cur = editor->cursor;
-  if (hook.row != cur.row || cur.col < hook.col)
-    return "";
-  LineIterator *it = begin_l_iter(editor->root, hook.row);
-  uint32_t line_len;
-  char *line = next_line(it, &line_len);
-  if (!line) {
-    free(it->buffer);
-    free(it);
-    return "";
-  }
-  std::string prefix(line + hook.col, cur.col - hook.col);
-  free(it->buffer);
-  free(it);
-  return prefix;
-}
-
-inline static void completion_adjust_scroll(CompletionSession &s) {
-  if (s.visible.empty())
-    return;
-  int vi = -1;
-  for (size_t i = 0; i < s.visible.size(); i++)
-    if (s.visible[i] == s.select) {
-      vi = (int)i;
-      break;
-    }
-  if (vi < 0)
-    return;
-  if ((uint32_t)vi < s.scroll)
-    s.scroll = vi;
-  else if ((uint32_t)vi >= s.scroll + 8)
-    s.scroll = vi - 7;
-}
-
-void completion_filter(Editor *editor) {
-  auto &session = editor->completion;
-  std::string prefix = completion_prefix(editor);
-  session.visible.clear();
-  for (size_t i = 0; i < session.items.size(); ++i) {
-    const auto &item = session.items[i];
-    const std::string &key = item.filter;
-    if (key.size() >= prefix.size() &&
-        key.compare(0, prefix.size(), prefix) == 0)
-      session.visible.push_back(i);
-  }
-  if (session.visible.empty()) {
-    session.box.hidden = true;
-    return;
-  }
-  if (std::find(session.visible.begin(), session.visible.end(),
-                session.select) == session.visible.end())
-    session.select = session.visible[0];
-  session.box.hidden = false;
-  session.scroll = 0;
-  completion_adjust_scroll(session);
-  session.box.render_update();
-}
-
-void completion_request(Editor *editor) {
-  Coord hook = editor->cursor;
-  word_boundaries(editor, editor->cursor, &hook.col, nullptr, nullptr, nullptr);
-  editor->completion.hook = hook;
-  editor->completion.complete = false;
-  editor->completion.active = false;
-  editor->completion.items.clear();
-  editor->completion.visible.clear();
-  editor->completion.select = 0;
-  editor->completion.version = editor->lsp_version;
-  LSPPending *pending = new LSPPending();
-  pending->editor = editor;
-  pending->callback = [](Editor *editor, const json &message) {
-    auto &session = editor->completion;
-    std::unique_lock lock(session.mtx);
-    std::vector<json> items_json;
-    std::vector<char> end_chars_def;
-    int insert_text_format = 1;
-    int insert_text_mode = 1;
-    if (message.contains("result")) {
-      auto &result = message["result"];
-      if (result.is_array()) {
-        items_json = result.get<std::vector<json>>();
-        session.complete = true;
-        if (items_json.empty())
-          return;
-        editor->completion.active = true;
-      } else if (result.is_object() && result.contains("items")) {
-        auto &list = result;
-        items_json = list["items"].get<std::vector<json>>();
-        if (items_json.empty())
-          return;
-        editor->completion.active = true;
-        session.complete = !list.value("isIncomplete", false);
-        if (list.contains("itemDefaults") && list["itemDefaults"].is_object()) {
-          auto &defs = list["itemDefaults"];
-          if (defs.contains("insertTextFormat") &&
-              defs["insertTextFormat"].is_number())
-            insert_text_format = defs["insertTextFormat"].get<int>();
-          if (defs.contains("insertTextMode") &&
-              defs["insertTextMode"].is_number())
-            insert_text_mode = defs["insertTextMode"].get<int>();
-          if (defs.contains("textEdit"))
-            if (defs["textEdit"].is_array())
-              for (auto &c : defs["textEdit"]) {
-                if (!c.is_string())
-                  continue;
-                std::string str = c.get<std::string>();
-                if (str.size() != 1)
-                  continue;
-                end_chars_def.push_back(str[0]);
-              }
-        }
-      }
-    }
-    session.items.reserve(items_json.size() + 1);
-    session.visible.reserve(items_json.size() + 1);
-    for (auto &item_json : items_json) {
-      CompletionItem item;
-      item.original = item_json;
-      item.label = item_json.value("label", "");
-      item.kind = item_json.value("kind", 0);
-      if (item_json.contains("detail") && item_json["detail"].is_string())
-        item.detail = item_json["detail"].get<std::string>();
-      if (item_json.contains("documentation")) {
-        if (item_json["documentation"].is_string()) {
-          item.documentation = item_json["documentation"].get<std::string>();
-        } else if (item_json["documentation"].contains("value") &&
-                   item_json["documentation"]["value"].is_string()) {
-          item.is_markup =
-              item_json["documentation"]["kind"].get<std::string>() ==
-              "markdown";
-          std::string documentation =
-              item_json["documentation"]["value"].get<std::string>();
-          if (documentation.size() > 1024)
-            item.is_markup = false;
-          if (item.is_markup) {
-            item.documentation =
-                substitute_fence(documentation, editor->lang.name);
-          } else {
-            item.documentation = documentation;
-          }
-        }
-      }
-      if (item_json.contains("deprecated") &&
-          item_json["deprecated"].is_boolean())
-        item.deprecated = item_json["deprecated"].get<bool>();
-      auto tags = item_json.value("tags", std::vector<int>());
-      for (auto tag : tags)
-        if (tag == 1)
-          item.deprecated = true;
-      item.sort = item_json.value("sortText", item.label);
-      item.filter = item_json.value("filterText", item.label);
-      if (item_json.contains("preselect") &&
-          item_json["preselect"].is_boolean() &&
-          item_json["preselect"].get<bool>())
-        session.select = session.items.size() - 1;
-      TextEdit edit;
-      if (item_json.contains("textEdit")) {
-        auto &te = item_json["textEdit"];
-        if (te.contains("newText")) {
-          edit.text = te.value("newText", "");
-          if (te.contains("replace")) {
-            edit.start.row = te["replace"]["start"]["line"];
-            edit.start.col = te["replace"]["start"]["character"];
-            edit.end.row = te["replace"]["end"]["line"];
-            edit.end.col = te["replace"]["end"]["character"];
-          } else if (te.contains("insert")) {
-            edit.start.row = te["insert"]["start"]["line"];
-            edit.start.col = te["insert"]["start"]["character"];
-            edit.end.row = te["insert"]["end"]["line"];
-            edit.end.col = te["insert"]["end"]["character"];
-          } else if (te.contains("range")) {
-            edit.start.row = te["range"]["start"]["line"];
-            edit.start.col = te["range"]["start"]["character"];
-            edit.end.row = te["range"]["end"]["line"];
-            edit.end.col = te["range"]["end"]["character"];
-          } else {
-            edit.start = session.hook;
-            edit.end = editor->cursor;
-          }
-        }
-      } else if (item_json.contains("insertText") &&
-                 item_json["insertText"].is_string()) {
-        edit.text = item_json["insertText"].get<std::string>();
-        edit.start = session.hook;
-        edit.end = editor->cursor;
-      } else {
-        edit.text = item.label;
-        edit.start = session.hook;
-        edit.end = editor->cursor;
-      }
-      utf8_normalize_edit(editor, &edit);
-      item.edits.push_back(edit);
-      if (item_json.contains("additionalTextEdits")) {
-        for (auto &te : item_json["additionalTextEdits"]) {
-          TextEdit edit;
-          edit.text = te.value("newText", "");
-          edit.start.row = te["range"]["start"]["line"];
-          edit.start.col = te["range"]["start"]["character"];
-          edit.end.row = te["range"]["end"]["line"];
-          edit.end.col = te["range"]["end"]["character"];
-          utf8_normalize_edit(editor, &edit);
-          item.edits.push_back(edit);
-        }
-      }
-      item.snippet = insert_text_format == 2;
-      if (item_json.contains("insertTextFormat"))
-        item.snippet = item_json["insertTextFormat"].get<int>() == 2;
-      if (item_json.contains("insertTextMode"))
-        item.asis = item_json["insertTextMode"].get<int>() == 1;
-      if (item_json.contains("commitCharacters"))
-        for (auto &c : item_json["commitCharacters"])
-          if (c.is_string() && c.get<std::string>().size() == 1)
-            item.end_chars.push_back(c.get<std::string>()[0]);
-      session.items.push_back(std::move(item));
-      session.visible.push_back(session.items.size() - 1);
-    }
-    session.box.hidden = false;
-    session.box.render_update();
-  };
-  std::shared_lock lock(editor->knot_mtx);
-  LineIterator *it = begin_l_iter(editor->root, hook.row);
-  uint32_t length;
-  char *line = next_line(it, &length);
-  if (!line) {
-    free(it->buffer);
-    free(it);
-    return;
-  }
-  uint32_t col = utf8_offset_to_utf16(line, length, editor->cursor.col);
-  free(it->buffer);
-  free(it);
-  lock.unlock();
-  json message = {
-      {"jsonrpc", "2.0"},
-      {"method", "textDocument/completion"},
-      {"params",
-       {{"textDocument", {{"uri", editor->uri}}},
-        {"position", {{"line", editor->cursor.row}, {"character", col}}}}}};
-  if (editor->completion.trigger > 0) {
-    json context = {{"triggerKind", editor->completion.trigger}};
-    if (editor->completion.trigger == 2 && editor->completion.trigger_char)
-      context["triggerCharacter"] =
-          std::string(1, *editor->completion.trigger_char);
-    message["params"]["context"] = context;
-  }
-  lsp_send(editor->lsp, message, pending);
-}
-
-void handle_completion(Editor *editor, KeyEvent event) {
-  if (!editor->lsp || !editor->lsp->allow_completion)
-    return;
-  if (mode != INSERT) {
-    editor->completion.active = false;
-    return;
-  }
-  std::unique_lock lock(editor->completion.mtx);
-  if (event.key_type == KEY_PASTE) {
-    editor->completion.active = false;
-    return;
-  } else if (event.key_type == KEY_CHAR) {
-    char ch = *event.c;
-    if (!editor->completion.active) {
-      for (char c : editor->lsp->trigger_chars)
-        if (c == ch) {
-          editor->completion.trigger = 2;
-          editor->completion.trigger_char = c;
-          completion_request(editor);
-          return;
-        }
-    } else {
-      if (!editor->completion.items.empty()) {
-        const auto &item = editor->completion.items[editor->completion.select];
-        const std::vector<char> &end_chars =
-            item.end_chars.empty() ? editor->lsp->end_chars : item.end_chars;
-        for (char c : end_chars)
-          if (c == ch) {
-            complete_accept(editor);
-            return;
-          }
-      }
-    }
-    if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
-        (ch >= '0' && ch <= '9') || ch == '_') {
-      if (editor->completion.active) {
-        if (editor->completion.complete)
-          completion_filter(editor);
-        else
-          completion_request(editor);
-      } else {
-        editor->completion.trigger = 3;
-        completion_request(editor);
-      }
-    } else if (ch == CTRL('\\')) {
-      if (editor->completion.active && !editor->completion.visible.empty()) {
-        complete_accept(editor);
-      } else {
-        editor->completion.trigger = 1;
-        completion_request(editor);
-      }
-    } else if (ch == CTRL('p')) {
-      if (editor->completion.active)
-        complete_next(editor);
-    } else if (ch == CTRL('o')) {
-      if (editor->completion.active)
-        complete_prev(editor);
-    } else if (ch == 0x7F || ch == 0x08 || ch == CTRL('W')) {
-      if (editor->completion.active) {
-        if (editor->completion.complete) {
-          if (editor->cursor <= editor->completion.hook)
-            editor->completion.active = false;
-          else
-            completion_filter(editor);
-        } else {
-          if (editor->cursor <= editor->completion.hook)
-            editor->completion.active = false;
-          else
-            completion_request(editor);
-        }
-      }
-    } else {
-      editor->completion.active = false;
-    }
-  } else if (event.key_type == KEY_MOUSE && event.mouse_modifier == 0) {
-    // Prolly remove mouse support here
-    // auto &box = editor->completion.box;
-    // if (event.mouse_y >= box.position.row &&
-    //     event.mouse_x >= box.position.col) {
-    //   uint32_t row = event.mouse_y - box.position.row;
-    //   uint32_t col = event.mouse_x - box.position.col;
-    //   if (row < box.size.row && col < box.size.col) {
-    //     uint8_t idx = 0;
-    //     /* TODO: fix index relative to scroll */
-    //     complete_select(editor, idx);
-    //   }
-    // }
-    // if it is being implemented then stop main event handler from processing
-    // when click inside the box
-    editor->completion.active = false;
-  } else {
-    editor->completion.active = false;
-  }
-}
-
-void completion_resolve_doc(Editor *editor) {
-  auto &item = editor->completion.items[editor->completion.select];
-  if (item.documentation)
-    return;
-  item.documentation = "";
-  LSPPending *pending = new LSPPending();
-  pending->editor = editor;
-  pending->callback = [](Editor *editor, const json &message) {
-    std::unique_lock lock(editor->completion.mtx);
-    auto &item = editor->completion.items[editor->completion.select];
-    if (message["result"].contains("documentation")) {
-      if (message["result"]["documentation"].is_string()) {
-        item.documentation =
-            message["result"]["documentation"].get<std::string>();
-      } else if (message["result"]["documentation"].contains("value") &&
-                 message["result"]["documentation"]["value"].is_string()) {
-        item.is_markup =
-            message["result"]["documentation"]["kind"].get<std::string>() ==
-            "markdown";
-        std::string documentation =
-            message["result"]["documentation"]["value"].get<std::string>();
-        if (documentation.size() > 1024)
-          item.is_markup = false;
-        if (item.is_markup) {
-          item.documentation =
-              substitute_fence(documentation, editor->lang.name);
-        } else {
-          item.documentation = documentation;
-        }
-      }
-    }
-    editor->completion.box.render_update();
-  };
-  json message = {{"jsonrpc", "2.0"},
-                  {"method", "completionItem/resolve"},
-                  {"params", item.original}};
-  lsp_send(editor->lsp, message, pending);
-}
-
-void complete_accept(Editor *editor) {
-  if (!editor->completion.active || editor->completion.box.hidden)
-    return;
-  auto &item = editor->completion.items[editor->completion.select];
-  // TODO: support snippets and asis here
-  //       once indentation engine is implemented
-  if (editor->completion.version != editor->lsp_version) {
-    int delta_col = 0;
-    TextEdit &e = item.edits[0];
-    if (e.end.row == editor->cursor.row) {
-      delta_col = editor->cursor.col - e.end.col;
-      e.end.col = editor->cursor.col;
-      for (size_t i = 1; i < item.edits.size(); ++i) {
-        TextEdit &e = item.edits[i];
-        if (e.start.row == editor->cursor.row) {
-          e.start.col += delta_col;
-          if (e.end.row == editor->cursor.row)
-            e.end.col += delta_col;
-        }
-      }
-    }
-  }
-  apply_lsp_edits(editor, item.edits, true);
-  editor->completion.active = false;
-}
-
-inline static int visible_index(const CompletionSession &s) {
-  for (size_t i = 0; i < s.visible.size(); ++i)
-    if (s.visible[i] == s.select)
-      return (int)i;
-  return -1;
-}
-
-void complete_next(Editor *editor) {
-  auto &s = editor->completion;
-  if (!s.active || s.box.hidden || s.visible.empty())
-    return;
-  int vi = visible_index(s);
-  if (vi < 0)
-    vi = 0;
-  else
-    vi = (vi + 1) % s.visible.size();
-  s.select = s.visible[vi];
-  completion_resolve_doc(editor);
-  completion_adjust_scroll(editor->completion);
-  editor->completion.box.render_update();
-}
-
-void complete_prev(Editor *editor) {
-  auto &s = editor->completion;
-  if (!s.active || s.box.hidden || s.visible.empty())
-    return;
-  int vi = visible_index(s);
-  if (vi < 0)
-    vi = 0;
-  else
-    vi = (vi + s.visible.size() - 1) % s.visible.size();
-  s.select = s.visible[vi];
-  completion_resolve_doc(editor);
-  completion_adjust_scroll(editor->completion);
-  editor->completion.box.render_update();
-}
-
-void complete_select(Editor *editor, uint8_t index) {
-  editor->completion.select = index;
-  complete_accept(editor);
-}
+// #include "editor/decl.h"
+// #include "editor/editor.h"
+// #include "io/knot.h"
+// #include "io/sysio.h"
+// #include "lsp/lsp.h"
+// #include "main.h"
+// #include "ui/completionbox.h"
+// #include "utils/utils.h"
+//
+// inline static std::string completion_prefix(Editor *editor) {
+//   Coord hook = editor->completion.hook;
+//   Coord cur = editor->cursor;
+//   if (hook.row != cur.row || cur.col < hook.col)
+//     return "";
+//   LineIterator *it = begin_l_iter(editor->root, hook.row);
+//   uint32_t line_len;
+//   char *line = next_line(it, &line_len);
+//   if (!line) {
+//     free(it->buffer);
+//     free(it);
+//     return "";
+//   }
+//   std::string prefix(line + hook.col, cur.col - hook.col);
+//   free(it->buffer);
+//   free(it);
+//   return prefix;
+// }
+//
+// inline static void completion_adjust_scroll(CompletionSession &s) {
+//   if (s.visible.empty())
+//     return;
+//   int vi = -1;
+//   for (size_t i = 0; i < s.visible.size(); i++)
+//     if (s.visible[i] == s.select) {
+//       vi = (int)i;
+//       break;
+//     }
+//   if (vi < 0)
+//     return;
+//   if ((uint32_t)vi < s.scroll)
+//     s.scroll = vi;
+//   else if ((uint32_t)vi >= s.scroll + 8)
+//     s.scroll = vi - 7;
+// }
+//
+// void completion_filter(Editor *editor) {
+//   auto &session = editor->completion;
+//   std::string prefix = completion_prefix(editor);
+//   session.visible.clear();
+//   for (size_t i = 0; i < session.items.size(); ++i) {
+//     const auto &item = session.items[i];
+//     const std::string &key = item.filter;
+//     if (key.size() >= prefix.size() &&
+//         key.compare(0, prefix.size(), prefix) == 0)
+//       session.visible.push_back(i);
+//   }
+//   if (session.visible.empty()) {
+//     session.box.hidden = true;
+//     return;
+//   }
+//   if (std::find(session.visible.begin(), session.visible.end(),
+//                 session.select) == session.visible.end())
+//     session.select = session.visible[0];
+//   session.box.hidden = false;
+//   session.scroll = 0;
+//   completion_adjust_scroll(session);
+//   session.box.render_update();
+// }
+//
+// void completion_request(Editor *editor) {
+//   Coord hook = editor->cursor;
+//   editor->word_boundaries(editor->cursor, &hook.col, nullptr, nullptr,
+//   nullptr); editor->completion.hook = hook; editor->completion.complete =
+//   false; editor->completion.active = false; editor->completion.items.clear();
+//   editor->completion.visible.clear();
+//   editor->completion.select = 0;
+//   editor->completion.version = editor->lsp_version;
+//   LSPPending *pending = new LSPPending();
+//   pending->editor = editor;
+//   pending->callback = [](Editor *editor, const json &message) {
+//     auto &session = editor->completion;
+//     std::unique_lock lock(session.mtx);
+//     std::vector<json> items_json;
+//     std::vector<char> end_chars_def;
+//     int insert_text_format = 1;
+//     int insert_text_mode = 1;
+//     if (message.contains("result")) {
+//       auto &result = message["result"];
+//       if (result.is_array()) {
+//         items_json = result.get<std::vector<json>>();
+//         session.complete = true;
+//         if (items_json.empty())
+//           return;
+//         editor->completion.active = true;
+//       } else if (result.is_object() && result.contains("items")) {
+//         auto &list = result;
+//         items_json = list["items"].get<std::vector<json>>();
+//         if (items_json.empty())
+//           return;
+//         editor->completion.active = true;
+//         session.complete = !list.value("isIncomplete", false);
+//         if (list.contains("itemDefaults") &&
+//         list["itemDefaults"].is_object()) {
+//           auto &defs = list["itemDefaults"];
+//           if (defs.contains("insertTextFormat") &&
+//               defs["insertTextFormat"].is_number())
+//             insert_text_format = defs["insertTextFormat"].get<int>();
+//           if (defs.contains("insertTextMode") &&
+//               defs["insertTextMode"].is_number())
+//             insert_text_mode = defs["insertTextMode"].get<int>();
+//           if (defs.contains("textEdit"))
+//             if (defs["textEdit"].is_array())
+//               for (auto &c : defs["textEdit"]) {
+//                 if (!c.is_string())
+//                   continue;
+//                 std::string str = c.get<std::string>();
+//                 if (str.size() != 1)
+//                   continue;
+//                 end_chars_def.push_back(str[0]);
+//               }
+//         }
+//       }
+//     }
+//     session.items.reserve(items_json.size() + 1);
+//     session.visible.reserve(items_json.size() + 1);
+//     for (auto &item_json : items_json) {
+//       CompletionItem item;
+//       item.original = item_json;
+//       item.label = item_json.value("label", "");
+//       item.kind = item_json.value("kind", 0);
+//       if (item_json.contains("detail") && item_json["detail"].is_string())
+//         item.detail = item_json["detail"].get<std::string>();
+//       if (item_json.contains("documentation")) {
+//         if (item_json["documentation"].is_string()) {
+//           item.documentation = item_json["documentation"].get<std::string>();
+//         } else if (item_json["documentation"].contains("value") &&
+//                    item_json["documentation"]["value"].is_string()) {
+//           item.is_markup =
+//               item_json["documentation"]["kind"].get<std::string>() ==
+//               "markdown";
+//           std::string documentation =
+//               item_json["documentation"]["value"].get<std::string>();
+//           if (documentation.size() > 1024)
+//             item.is_markup = false;
+//           if (item.is_markup) {
+//             item.documentation =
+//                 substitute_fence(documentation, editor->lang.name);
+//           } else {
+//             item.documentation = documentation;
+//           }
+//         }
+//       }
+//       if (item_json.contains("deprecated") &&
+//           item_json["deprecated"].is_boolean())
+//         item.deprecated = item_json["deprecated"].get<bool>();
+//       auto tags = item_json.value("tags", std::vector<int>());
+//       for (auto tag : tags)
+//         if (tag == 1)
+//           item.deprecated = true;
+//       item.sort = item_json.value("sortText", item.label);
+//       item.filter = item_json.value("filterText", item.label);
+//       if (item_json.contains("preselect") &&
+//           item_json["preselect"].is_boolean() &&
+//           item_json["preselect"].get<bool>())
+//         session.select = session.items.size() - 1;
+//       TextEdit edit;
+//       if (item_json.contains("textEdit")) {
+//         auto &te = item_json["textEdit"];
+//         if (te.contains("newText")) {
+//           edit.text = te.value("newText", "");
+//           if (te.contains("replace")) {
+//             edit.start.row = te["replace"]["start"]["line"];
+//             edit.start.col = te["replace"]["start"]["character"];
+//             edit.end.row = te["replace"]["end"]["line"];
+//             edit.end.col = te["replace"]["end"]["character"];
+//           } else if (te.contains("insert")) {
+//             edit.start.row = te["insert"]["start"]["line"];
+//             edit.start.col = te["insert"]["start"]["character"];
+//             edit.end.row = te["insert"]["end"]["line"];
+//             edit.end.col = te["insert"]["end"]["character"];
+//           } else if (te.contains("range")) {
+//             edit.start.row = te["range"]["start"]["line"];
+//             edit.start.col = te["range"]["start"]["character"];
+//             edit.end.row = te["range"]["end"]["line"];
+//             edit.end.col = te["range"]["end"]["character"];
+//           } else {
+//             edit.start = session.hook;
+//             edit.end = editor->cursor;
+//           }
+//         }
+//       } else if (item_json.contains("insertText") &&
+//                  item_json["insertText"].is_string()) {
+//         edit.text = item_json["insertText"].get<std::string>();
+//         edit.start = session.hook;
+//         edit.end = editor->cursor;
+//       } else {
+//         edit.text = item.label;
+//         edit.start = session.hook;
+//         edit.end = editor->cursor;
+//       }
+//       editor->utf8_normalize_edit(&edit);
+//       item.edits.push_back(edit);
+//       if (item_json.contains("additionalTextEdits")) {
+//         for (auto &te : item_json["additionalTextEdits"]) {
+//           TextEdit edit;
+//           edit.text = te.value("newText", "");
+//           edit.start.row = te["range"]["start"]["line"];
+//           edit.start.col = te["range"]["start"]["character"];
+//           edit.end.row = te["range"]["end"]["line"];
+//           edit.end.col = te["range"]["end"]["character"];
+//           editor->utf8_normalize_edit(&edit);
+//           item.edits.push_back(edit);
+//         }
+//       }
+//       item.snippet = insert_text_format == 2;
+//       if (item_json.contains("insertTextFormat"))
+//         item.snippet = item_json["insertTextFormat"].get<int>() == 2;
+//       if (item_json.contains("insertTextMode"))
+//         item.asis = item_json["insertTextMode"].get<int>() == 1;
+//       if (item_json.contains("commitCharacters"))
+//         for (auto &c : item_json["commitCharacters"])
+//           if (c.is_string() && c.get<std::string>().size() == 1)
+//             item.end_chars.push_back(c.get<std::string>()[0]);
+//       session.items.push_back(std::move(item));
+//       session.visible.push_back(session.items.size() - 1);
+//     }
+//     session.box.hidden = false;
+//     session.box.render_update();
+//   };
+//   LineIterator *it = begin_l_iter(editor->root, hook.row);
+//   uint32_t length;
+//   char *line = next_line(it, &length);
+//   if (!line) {
+//     free(it->buffer);
+//     free(it);
+//     return;
+//   }
+//   uint32_t col = utf8_offset_to_utf16(line, length, editor->cursor.col);
+//   free(it->buffer);
+//   free(it);
+//   json message = {
+//       {"jsonrpc", "2.0"},
+//       {"method", "textDocument/completion"},
+//       {"params",
+//        {{"textDocument", {{"uri", editor->uri}}},
+//         {"position", {{"line", editor->cursor.row}, {"character", col}}}}}};
+//   if (editor->completion.trigger > 0) {
+//     json context = {{"triggerKind", editor->completion.trigger}};
+//     if (editor->completion.trigger == 2 && editor->completion.trigger_char)
+//       context["triggerCharacter"] =
+//           std::string(1, *editor->completion.trigger_char);
+//     message["params"]["context"] = context;
+//   }
+//   lsp_send(editor->lsp, message, pending);
+// }
+//
+// // Move this into the box and merge the box and this guy
+// void CompletionSession::handle(KeyEvent event) {
+//   if (!editor->lsp || !editor->lsp->allow_completion)
+//     return;
+//   if (mode != INSERT) {
+//     this->active = false;
+//     return;
+//   }
+//   std::unique_lock lock(this->mtx);
+//   if (event.key_type == KEY_PASTE) {
+//     this->active = false;
+//     return;
+//   } else if (event.key_type == KEY_CHAR) {
+//     char ch = *event.c;
+//     if (!this->active) {
+//       for (char c : editor->lsp->trigger_chars)
+//         if (c == ch) {
+//           this->trigger = 2;
+//           this->trigger_char = c;
+//           completion_request(editor);
+//           return;
+//         }
+//     } else {
+//       if (!editor->completion.items.empty()) {
+//         const auto &item =
+//         editor->completion.items[editor->completion.select]; const
+//         std::vector<char> &end_chars =
+//             item.end_chars.empty() ? editor->lsp->end_chars : item.end_chars;
+//         for (char c : end_chars)
+//           if (c == ch) {
+//             this->accept();
+//             return;
+//           }
+//       }
+//     }
+//     if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
+//         (ch >= '0' && ch <= '9') || ch == '_') {
+//       if (this->active) {
+//         if (this->complete)
+//           completion_filter(editor);
+//         else
+//           completion_request(editor);
+//       } else {
+//         this->trigger = 3;
+//         completion_request(editor);
+//       }
+//     } else if (ch == CTRL('\\')) {
+//       if (this->active && !this->visible.empty()) {
+//         this->accept();
+//       } else {
+//         this->trigger = 1;
+//         completion_request(editor);
+//       }
+//     } else if (ch == CTRL('p')) {
+//       if (this->active)
+//         this->next();
+//     } else if (ch == CTRL('o')) {
+//       if (this->active)
+//         this->prev();
+//     } else if (ch == 0x7F || ch == 0x08 || ch == CTRL('W')) {
+//       if (this->active) {
+//         if (this->complete) {
+//           if (editor->cursor <= this->hook)
+//             this->active = false;
+//           else
+//             completion_filter(editor);
+//         } else {
+//           if (editor->cursor <= this->hook)
+//             this->active = false;
+//           else
+//             completion_request(editor);
+//         }
+//       }
+//     } else {
+//       this->active = false;
+//     }
+//   } else if (event.key_type == KEY_MOUSE && event.mouse_modifier == 0) {
+//     // Prolly add mouse support here
+//     // auto &box = this->box;
+//     // if (event.mouse_y >= box.position.row &&
+//     //     event.mouse_x >= box.position.col) {
+//     //   uint32_t row = event.mouse_y - box.position.row;
+//     //   uint32_t col = event.mouse_x - box.position.col;
+//     //   if (row < box.size.row && col < box.size.col) {
+//     //     uint8_t idx = 0;
+//     //     /* TODO: fix index relative to scroll */
+//     //     complete_select(editor, idx);
+//     //   }
+//     // }
+//     // if it is being implemented then stop main event handler from
+//     processing
+//         // when click inside the box
+//         this->active = false;
+//   } else {
+//     this->active = false;
+//   }
+// }
+//
+// void CompletionSession::resolve_doc() {
+//   auto &item = this->items[this->select];
+//   if (item.documentation)
+//     return;
+//   item.documentation = "";
+//   LSPPending *pending = new LSPPending();
+//   pending->editor = editor;
+//   pending->callback = [](Editor *editor, const json &message) {
+//     std::unique_lock lock(editor->completion.mtx);
+//     auto &item = editor->completion.items[editor->completion.select];
+//     if (message["result"].contains("documentation")) {
+//       if (message["result"]["documentation"].is_string()) {
+//         item.documentation =
+//             message["result"]["documentation"].get<std::string>();
+//       } else if (message["result"]["documentation"].contains("value") &&
+//                  message["result"]["documentation"]["value"].is_string()) {
+//         item.is_markup =
+//             message["result"]["documentation"]["kind"].get<std::string>() ==
+//             "markdown";
+//         std::string documentation =
+//             message["result"]["documentation"]["value"].get<std::string>();
+//         if (documentation.size() > 1024)
+//           item.is_markup = false;
+//         if (item.is_markup) {
+//           item.documentation =
+//               substitute_fence(documentation, editor->lang.name);
+//         } else {
+//           item.documentation = documentation;
+//         }
+//       }
+//     }
+//     editor->completion.box.render_update();
+//   };
+//   json message = {{"jsonrpc", "2.0"},
+//                   {"method", "completionItem/resolve"},
+//                   {"params", item.original}};
+//   lsp_send(editor->lsp, message, pending);
+// }
+//
+// void CompletionSession::accept() {
+//   if (!this->active || this->box.hidden)
+//     return;
+//   auto &item = this->items[this->select];
+//   // TODO: support snippets and asis here
+//   //       once indentation engine is implemented
+//   if (this->version != editor->lsp_version) {
+//     int delta_col = 0;
+//     TextEdit &e = item.edits[0];
+//     if (e.end.row == editor->cursor.row) {
+//       delta_col = editor->cursor.col - e.end.col;
+//       e.end.col = editor->cursor.col;
+//       for (size_t i = 1; i < item.edits.size(); ++i) {
+//         TextEdit &e = item.edits[i];
+//         if (e.start.row == editor->cursor.row) {
+//           e.start.col += delta_col;
+//           if (e.end.row == editor->cursor.row)
+//             e.end.col += delta_col;
+//         }
+//       }
+//     }
+//   }
+//   editor->apply_lsp_edits(item.edits, true);
+//   this->active = false;
+// }
+//
+// inline static int visible_index(const CompletionSession &s) {
+//   for (size_t i = 0; i < s.visible.size(); ++i)
+//     if (s.visible[i] == s.select)
+//       return (int)i;
+//   return -1;
+// }
+//
+// void CompletionSession::next() {
+//   if (!this->active || this->box.hidden || this->visible.empty())
+//     return;
+//   int vi = visible_index(*this);
+//   if (vi < 0)
+//     vi = 0;
+//   else
+//     vi = (vi + 1) % this->visible.size();
+//   this->select = this->visible[vi];
+//   this->resolve_doc();
+//   completion_adjust_scroll(*this);
+//   this->box.render_update();
+// }
+//
+// void CompletionSession::prev() {
+//   if (!this->active || this->box.hidden || this->visible.empty())
+//     return;
+//   int vi = visible_index(*this);
+//   if (vi < 0)
+//     vi = 0;
+//   else
+//     vi = (vi + this->visible.size() - 1) % this->visible.size();
+//   this->select = this->visible[vi];
+//   this->resolve_doc();
+//   completion_adjust_scroll(*this);
+//   this->box.render_update();
+// }
+//
+// void CompletionSession::choose(uint8_t index) {
+//   this->select = index;
+//   this->accept();
+// }
diff --git a/src/editor/cursor.cc b/src/editor/cursor.cc
index 90b7ed2..e7b0398 100644
--- a/src/editor/cursor.cc
+++ b/src/editor/cursor.cc
@@ -1,14 +1,14 @@
 #include "editor/editor.h"
 #include "utils/utils.h"
 
-Coord move_right(Editor *editor, Coord cursor, uint32_t number) {
+Coord Editor::move_right(Coord cursor, uint32_t number) {
   Coord result = cursor;
-  if (!editor || !editor->root || number == 0)
+  if (!this->root || number == 0)
     return result;
   uint32_t row = result.row;
   uint32_t col = result.col;
   uint32_t line_len = 0;
-  LineIterator *it = begin_l_iter(editor->root, row);
+  LineIterator *it = begin_l_iter(this->root, row);
   if (!it)
     return result;
   char *line = next_line(it, &line_len);
@@ -22,7 +22,7 @@ Coord move_right(Editor *editor, Coord cursor, uint32_t number) {
   while (number > 0) {
     if (col >= line_len) {
       uint32_t next_row = row + 1;
-      if (next_row >= editor->root->line_count) {
+      if (next_row >= this->root->line_count) {
         col = line_len;
         break;
       }
@@ -49,14 +49,16 @@ Coord move_right(Editor *editor, Coord cursor, uint32_t number) {
   return result;
 }
 
-Coord move_left(Editor *editor, Coord cursor, uint32_t number) {
+Coord Editor::move_left(Coord cursor, uint32_t number) {
   Coord result = cursor;
-  if (!editor || !editor->root || number == 0)
+  if (!this->root || number == 0)
     return result;
   uint32_t row = result.row;
   uint32_t col = result.col;
   uint32_t len = 0;
-  LineIterator *it = begin_l_iter(editor->root, row);
+  LineIterator *it = begin_l_iter(this->root, row);
+  if (!it)
+    return result;
   char *line = next_line(it, &len);
   if (!line) {
     free(it->buffer);
@@ -102,29 +104,28 @@ Coord move_left(Editor *editor, Coord cursor, uint32_t number) {
   return result;
 }
 
-void cursor_down(Editor *editor, uint32_t number) {
-  if (!editor || !editor->root || number == 0)
+void Editor::cursor_down(uint32_t number) {
+  if (!this->root || number == 0)
     return;
-  uint32_t visual_col = editor->cursor_preffered;
+  uint32_t visual_col = this->cursor_preffered;
   if (visual_col == UINT32_MAX) {
     uint32_t len;
-    LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+    LineIterator *it = begin_l_iter(this->root, this->cursor.row);
     char *line = next_line(it, &len);
     if (!line) {
       free(it->buffer);
       free(it);
       return;
     }
-    editor->cursor_preffered =
-        get_visual_col_from_bytes(line, len, editor->cursor.col);
-    visual_col = editor->cursor_preffered;
+    this->cursor_preffered =
+        get_visual_col_from_bytes(line, len, this->cursor.col);
+    visual_col = this->cursor_preffered;
     free(it->buffer);
     free(it);
   }
-  editor->cursor.row =
-      MIN(editor->cursor.row + number, editor->root->line_count - 1);
+  this->cursor.row = MIN(this->cursor.row + number, this->root->line_count - 1);
   uint32_t len;
-  LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+  LineIterator *it = begin_l_iter(this->root, this->cursor.row);
   char *line = next_line(it, &len);
   if (!line) {
     free(it->buffer);
@@ -133,26 +134,26 @@ void cursor_down(Editor *editor, uint32_t number) {
   }
   if (len > 0 && line[len - 1] == '\n')
     --len;
-  editor->cursor.col = get_bytes_from_visual_col(line, len, visual_col);
+  this->cursor.col = get_bytes_from_visual_col(line, len, visual_col);
   free(it->buffer);
   free(it);
 }
 
-void cursor_up(Editor *editor, uint32_t number) {
-  if (!editor || !editor->root || number == 0 || editor->cursor.row == 0)
+void Editor::cursor_up(uint32_t number) {
+  if (!this->root || number == 0 || this->cursor.row == 0)
     return;
   uint32_t len;
-  LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+  LineIterator *it = begin_l_iter(this->root, this->cursor.row);
   char *line_content = next_line(it, &len);
   if (!line_content)
     return;
-  if (editor->cursor_preffered == UINT32_MAX)
-    editor->cursor_preffered =
-        get_visual_col_from_bytes(line_content, len, editor->cursor.col);
-  uint32_t visual_col = editor->cursor_preffered;
+  if (this->cursor_preffered == UINT32_MAX)
+    this->cursor_preffered =
+        get_visual_col_from_bytes(line_content, len, this->cursor.col);
+  uint32_t visual_col = this->cursor_preffered;
   free(it->buffer);
   free(it);
-  uint32_t target_row = editor->cursor.row;
+  uint32_t target_row = this->cursor.row;
   while (number > 0 && target_row > 0) {
     target_row--;
     if (target_row == 0) {
@@ -161,32 +162,31 @@ void cursor_up(Editor *editor, uint32_t number) {
     }
     number--;
   }
-  it = begin_l_iter(editor->root, target_row);
+  it = begin_l_iter(this->root, target_row);
   line_content = next_line(it, &len);
   if (line_content) {
     if (len > 0 && line_content[len - 1] == '\n')
       --len;
-    editor->cursor.row = target_row;
-    editor->cursor.col =
-        get_bytes_from_visual_col(line_content, len, visual_col);
+    this->cursor.row = target_row;
+    this->cursor.col = get_bytes_from_visual_col(line_content, len, visual_col);
   } else {
-    editor->cursor.row = 0;
-    editor->cursor.col = 0;
+    this->cursor.row = 0;
+    this->cursor.col = 0;
   }
   free(it->buffer);
   free(it);
 }
 
-void cursor_right(Editor *editor, uint32_t number) {
-  if (!editor || !editor->root || number == 0)
+void Editor::cursor_right(uint32_t number) {
+  if (!this->root || number == 0)
     return;
-  editor->cursor = move_right(editor, editor->cursor, number);
-  editor->cursor_preffered = UINT32_MAX;
+  this->cursor = this->move_right(this->cursor, number);
+  this->cursor_preffered = UINT32_MAX;
 }
 
-void cursor_left(Editor *editor, uint32_t number) {
-  if (!editor || !editor->root || number == 0)
+void Editor::cursor_left(uint32_t number) {
+  if (!this->root || number == 0)
     return;
-  editor->cursor = move_left(editor, editor->cursor, number);
-  editor->cursor_preffered = UINT32_MAX;
+  this->cursor = this->move_left(this->cursor, number);
+  this->cursor_preffered = UINT32_MAX;
 }
diff --git a/src/editor/edit.cc b/src/editor/edit.cc
index 45c1d8d..cda9876 100644
--- a/src/editor/edit.cc
+++ b/src/editor/edit.cc
@@ -2,20 +2,18 @@
 #include "lsp/lsp.h"
 #include "utils/utils.h"
 
-void edit_erase(Editor *editor, Coord pos, int64_t len) {
+void Editor::edit_erase(Coord pos, int64_t len) {
   if (len == 0)
     return;
   if (len < 0) {
-    std::shared_lock lock_1(editor->knot_mtx);
     uint32_t cursor_original =
-        line_to_byte(editor->root, editor->cursor.row, nullptr) +
-        editor->cursor.col;
-    uint32_t byte_pos = line_to_byte(editor->root, pos.row, nullptr) + pos.col;
-    Coord point = move_left(editor, pos, -len);
+        line_to_byte(this->root, this->cursor.row, nullptr) + this->cursor.col;
+    uint32_t byte_pos = line_to_byte(this->root, pos.row, nullptr) + pos.col;
+    Coord point = this->move_left(pos, -len);
     json lsp_range;
-    bool do_lsp = (editor->lsp != nullptr);
+    bool do_lsp = (this->lsp != nullptr);
     if (do_lsp) {
-      LineIterator *it = begin_l_iter(editor->root, point.row);
+      LineIterator *it = begin_l_iter(this->root, point.row);
       uint32_t len;
       char *line = next_line(it, &len);
       int utf16_start = 0;
@@ -23,7 +21,7 @@ void edit_erase(Editor *editor, Coord pos, int64_t len) {
         utf16_start = utf8_offset_to_utf16(line, len, point.col);
       free(it->buffer);
       free(it);
-      it = begin_l_iter(editor->root, pos.row);
+      it = begin_l_iter(this->root, pos.row);
       line = next_line(it, &len);
       int utf16_end = 0;
       if (line)
@@ -33,62 +31,58 @@ void edit_erase(Editor *editor, Coord pos, int64_t len) {
       lsp_range = {{"start", {{"line", point.row}, {"character", utf16_start}}},
                    {"end", {{"line", pos.row}, {"character", utf16_end}}}};
     }
-    uint32_t start = line_to_byte(editor->root, point.row, nullptr) + point.col;
+    uint32_t start = line_to_byte(this->root, point.row, nullptr) + point.col;
     if (cursor_original > start && cursor_original <= byte_pos) {
-      editor->cursor = point;
-      editor->cursor_preffered = UINT32_MAX;
+      this->cursor = point;
+      this->cursor_preffered = UINT32_MAX;
     } else if (cursor_original > byte_pos) {
       uint32_t cursor_new = cursor_original - (byte_pos - start);
       uint32_t new_col;
-      uint32_t new_row = byte_to_line(editor->root, cursor_new, &new_col);
-      editor->cursor = {new_row, new_col};
-      editor->cursor_preffered = UINT32_MAX;
+      uint32_t new_row = byte_to_line(this->root, cursor_new, &new_col);
+      this->cursor = {new_row, new_col};
+      this->cursor_preffered = UINT32_MAX;
     }
-    lock_1.unlock();
     uint32_t start_row = point.row;
     uint32_t end_row = pos.row;
-    apply_hook_deletion(editor, start_row + 1, end_row);
-    std::unique_lock lock_2(editor->knot_mtx);
-    editor->root = erase(editor->root, start, byte_pos - start);
-    lock_2.unlock();
-    if (editor->parser)
-      editor->parser->edit(start_row, end_row - start_row, 0);
+    this->apply_hook_deletion(start_row + 1, end_row);
+    this->root = erase(this->root, start, byte_pos - start);
+    if (this->parser)
+      this->parser->edit(start_row, end_row - start_row, 0);
     if (do_lsp) {
-      if (editor->lsp->incremental_sync) {
-        json message = {
-            {"jsonrpc", "2.0"},
+      auto lsp = this->lsp.load();
+      if (lsp->incremental_sync) {
+        auto message = std::make_unique<LSPMessage>();
+        message->message = {
             {"method", "textDocument/didChange"},
             {"params",
              {{"textDocument",
-               {{"uri", editor->uri}, {"version", ++editor->lsp_version}}},
+               {{"uri", this->uri}, {"version", ++this->lsp_version}}},
               {"contentChanges",
                json::array({{{"range", lsp_range}, {"text", ""}}})}}}};
-        lsp_send(editor->lsp, message, nullptr);
+        lsp->send(std::move(message));
       } else {
-        char *buf = read(editor->root, 0, editor->root->char_count);
+        char *buf = read(this->root, 0, this->root->char_count);
         std::string text(buf);
         free(buf);
-        json message = {
-            {"jsonrpc", "2.0"},
+        auto message = std::make_unique<LSPMessage>();
+        message->message = {
             {"method", "textDocument/didChange"},
             {"params",
              {{"textDocument",
-               {{"uri", editor->uri}, {"version", ++editor->lsp_version}}},
+               {{"uri", this->uri}, {"version", ++this->lsp_version}}},
               {"contentChanges", json::array({{{"text", text}}})}}}};
-        lsp_send(editor->lsp, message, nullptr);
+        lsp->send(std::move(message));
       }
     }
   } else {
-    std::shared_lock lock_1(editor->knot_mtx);
     uint32_t cursor_original =
-        line_to_byte(editor->root, editor->cursor.row, nullptr) +
-        editor->cursor.col;
-    uint32_t byte_pos = line_to_byte(editor->root, pos.row, nullptr) + pos.col;
-    Coord point = move_right(editor, pos, len);
+        line_to_byte(this->root, this->cursor.row, nullptr) + this->cursor.col;
+    uint32_t byte_pos = line_to_byte(this->root, pos.row, nullptr) + pos.col;
+    Coord point = this->move_right(pos, len);
     json lsp_range;
-    bool do_lsp = (editor->lsp != nullptr);
+    bool do_lsp = (this->lsp != nullptr);
     if (do_lsp) {
-      LineIterator *it = begin_l_iter(editor->root, pos.row);
+      LineIterator *it = begin_l_iter(this->root, pos.row);
       uint32_t line_len;
       char *line = next_line(it, &line_len);
       int utf16_start = 0;
@@ -96,7 +90,7 @@ void edit_erase(Editor *editor, Coord pos, int64_t len) {
         utf16_start = utf8_offset_to_utf16(line, line_len, pos.col);
       free(it->buffer);
       free(it);
-      it = begin_l_iter(editor->root, point.row);
+      it = begin_l_iter(this->root, point.row);
       line = next_line(it, &line_len);
       int utf16_end = 0;
       if (line)
@@ -106,67 +100,63 @@ void edit_erase(Editor *editor, Coord pos, int64_t len) {
       lsp_range = {{"start", {{"line", pos.row}, {"character", utf16_start}}},
                    {"end", {{"line", point.row}, {"character", utf16_end}}}};
     }
-    uint32_t end = line_to_byte(editor->root, point.row, nullptr) + point.col;
+    uint32_t end = line_to_byte(this->root, point.row, nullptr) + point.col;
     if (cursor_original > byte_pos && cursor_original <= end) {
-      editor->cursor = pos;
-      editor->cursor_preffered = UINT32_MAX;
+      this->cursor = pos;
+      this->cursor_preffered = UINT32_MAX;
     } else if (cursor_original > end) {
       uint32_t cursor_new = cursor_original - (end - byte_pos);
       uint32_t new_col;
-      uint32_t new_row = byte_to_line(editor->root, cursor_new, &new_col);
-      editor->cursor = {new_row, new_col};
-      editor->cursor_preffered = UINT32_MAX;
+      uint32_t new_row = byte_to_line(this->root, cursor_new, &new_col);
+      this->cursor = {new_row, new_col};
+      this->cursor_preffered = UINT32_MAX;
     }
-    lock_1.unlock();
     uint32_t start_row = pos.row;
     uint32_t end_row = point.row;
-    apply_hook_deletion(editor, start_row + 1, end_row);
-    std::unique_lock lock_2(editor->knot_mtx);
-    editor->root = erase(editor->root, byte_pos, end - byte_pos);
-    lock_2.unlock();
-    if (editor->parser)
-      editor->parser->edit(start_row, end_row - start_row, 0);
+    this->apply_hook_deletion(start_row + 1, end_row);
+    this->root = erase(this->root, byte_pos, end - byte_pos);
+    if (this->parser)
+      this->parser->edit(start_row, end_row - start_row, 0);
     if (do_lsp) {
-      if (editor->lsp->incremental_sync) {
-        json message = {
-            {"jsonrpc", "2.0"},
+      auto lsp = this->lsp.load();
+      if (lsp->incremental_sync) {
+        auto message = std::make_unique<LSPMessage>();
+        message->message = {
             {"method", "textDocument/didChange"},
             {"params",
              {{"textDocument",
-               {{"uri", editor->uri}, {"version", ++editor->lsp_version}}},
+               {{"uri", this->uri}, {"version", ++this->lsp_version}}},
               {"contentChanges",
                json::array({{{"range", lsp_range}, {"text", ""}}})}}}};
-        lsp_send(editor->lsp, message, nullptr);
+        lsp->send(std::move(message));
       } else {
-        char *buf = read(editor->root, 0, editor->root->char_count);
+        char *buf = read(this->root, 0, this->root->char_count);
         std::string text(buf);
         free(buf);
-        json message = {
-            {"jsonrpc", "2.0"},
+        auto message = std::make_unique<LSPMessage>();
+        message->message = {
             {"method", "textDocument/didChange"},
             {"params",
              {{"textDocument",
-               {{"uri", editor->uri}, {"version", ++editor->lsp_version}}},
+               {{"uri", this->uri}, {"version", ++this->lsp_version}}},
               {"contentChanges", json::array({{{"text", text}}})}}}};
-        lsp_send(editor->lsp, message, nullptr);
+        lsp->send(std::move(message));
       }
     }
   }
 }
 
-void edit_insert(Editor *editor, Coord pos, char *data, uint32_t len) {
-  std::shared_lock lock_1(editor->knot_mtx);
+void Editor::edit_insert(Coord pos, char *data, uint32_t len) {
   uint32_t cursor_original =
-      line_to_byte(editor->root, editor->cursor.row, nullptr) +
-      editor->cursor.col;
-  uint32_t byte_pos = line_to_byte(editor->root, pos.row, nullptr) + pos.col;
+      line_to_byte(this->root, this->cursor.row, nullptr) + this->cursor.col;
+  uint32_t byte_pos = line_to_byte(this->root, pos.row, nullptr) + pos.col;
   if (cursor_original > byte_pos) {
     uint32_t cursor_new = cursor_original + len;
     uint32_t new_col;
-    uint32_t new_row = byte_to_line(editor->root, cursor_new, &new_col);
-    editor->cursor = {new_row, new_col};
+    uint32_t new_row = byte_to_line(this->root, cursor_new, &new_col);
+    this->cursor = {new_row, new_col};
   }
-  LineIterator *it = begin_l_iter(editor->root, pos.row);
+  LineIterator *it = begin_l_iter(this->root, pos.row);
   uint32_t line_len;
   char *line = next_line(it, &line_len);
   int utf16_col = 0;
@@ -174,55 +164,52 @@ void edit_insert(Editor *editor, Coord pos, char *data, uint32_t len) {
     utf16_col = utf8_offset_to_utf16(line, line_len, pos.col);
   free(it->buffer);
   free(it);
-  lock_1.unlock();
-  std::unique_lock lock_2(editor->knot_mtx);
-  editor->root = insert(editor->root, byte_pos, data, len);
+  this->root = insert(this->root, byte_pos, data, len);
   uint32_t rows = 0;
   for (uint32_t i = 0; i < len; i++)
     if (data[i] == '\n')
       rows++;
-  apply_hook_insertion(editor, pos.row, rows);
-  lock_2.unlock();
-  if (editor->parser)
-    editor->parser->edit(pos.row, 0, rows);
-  if (editor->lsp) {
-    if (editor->lsp->incremental_sync) {
-      json message = {
-          {"jsonrpc", "2.0"},
+  this->apply_hook_insertion(pos.row, rows);
+  if (this->parser)
+    this->parser->edit(pos.row, 0, rows);
+  auto lsp = this->lsp.load();
+  if (lsp) {
+    if (lsp->incremental_sync) {
+      auto message = std::make_unique<LSPMessage>();
+      message->message = {
           {"method", "textDocument/didChange"},
           {"params",
            {{"textDocument",
-             {{"uri", editor->uri}, {"version", ++editor->lsp_version}}},
+             {{"uri", this->uri}, {"version", ++this->lsp_version}}},
             {"contentChanges",
              json::array(
                  {{{"range",
                     {{"start", {{"line", pos.row}, {"character", utf16_col}}},
                      {"end", {{"line", pos.row}, {"character", utf16_col}}}}},
                    {"text", std::string(data, len)}}})}}}};
-      lsp_send(editor->lsp, message, nullptr);
+      lsp->send(std::move(message));
     } else {
-      char *buf = read(editor->root, 0, editor->root->char_count);
+      char *buf = read(this->root, 0, this->root->char_count);
       std::string text(buf);
       free(buf);
-      json message = {
-          {"jsonrpc", "2.0"},
+      auto message = std::make_unique<LSPMessage>();
+      message->message = {
           {"method", "textDocument/didChange"},
           {"params",
            {{"textDocument",
-             {{"uri", editor->uri}, {"version", ++editor->lsp_version}}},
+             {{"uri", this->uri}, {"version", ++this->lsp_version}}},
             {"contentChanges", json::array({{{"text", text}}})}}}};
-      lsp_send(editor->lsp, message, nullptr);
+      lsp->send(std::move(message));
     }
   }
 }
 
-void edit_replace(Editor *editor, Coord start, Coord end, const char *text,
-                  uint32_t len) {
-  std::unique_lock lock(editor->knot_mtx);
+void Editor::edit_replace(Coord start, Coord end, const char *text,
+                          uint32_t len) {
   uint32_t start_byte =
-      line_to_byte(editor->root, start.row, nullptr) + start.col;
-  uint32_t end_byte = line_to_byte(editor->root, end.row, nullptr) + end.col;
-  LineIterator *it = begin_l_iter(editor->root, start.row);
+      line_to_byte(this->root, start.row, nullptr) + start.col;
+  uint32_t end_byte = line_to_byte(this->root, end.row, nullptr) + end.col;
+  LineIterator *it = begin_l_iter(this->root, start.row);
   uint32_t line_len;
   char *line = next_line(it, &line_len);
   int utf16_start = 0;
@@ -230,7 +217,7 @@ void edit_replace(Editor *editor, Coord start, Coord end, const char *text,
     utf16_start = utf8_offset_to_utf16(line, line_len, start.col);
   free(it->buffer);
   free(it);
-  it = begin_l_iter(editor->root, end.row);
+  it = begin_l_iter(this->root, end.row);
   line = next_line(it, &line_len);
   int utf16_end = 0;
   if (line)
@@ -238,25 +225,26 @@ void edit_replace(Editor *editor, Coord start, Coord end, const char *text,
   free(it->buffer);
   free(it);
   if (start_byte != end_byte)
-    editor->root = erase(editor->root, start_byte, end_byte - start_byte);
+    this->root = erase(this->root, start_byte, end_byte - start_byte);
   if (len > 0)
-    editor->root = insert(editor->root, start_byte, (char *)text, len);
+    this->root = insert(this->root, start_byte, (char *)text, len);
   uint32_t rows = 0;
   for (uint32_t i = 0; i < len; i++)
     if (text[i] == '\n')
       rows++;
   if (rows > 0)
     rows--;
-  if (editor->parser)
-    editor->parser->edit(start.row, end.row - start.row, rows);
-  if (editor->lsp) {
-    if (editor->lsp->incremental_sync) {
-      json message = {
-          {"jsonrpc", "2.0"},
+  if (this->parser)
+    this->parser->edit(start.row, end.row - start.row, rows);
+  auto lsp = this->lsp.load();
+  if (lsp) {
+    if (lsp->incremental_sync) {
+      auto message = std::make_unique<LSPMessage>();
+      message->message = {
           {"method", "textDocument/didChange"},
           {"params",
            {{"textDocument",
-             {{"uri", editor->uri}, {"version", ++editor->lsp_version}}},
+             {{"uri", this->uri}, {"version", ++this->lsp_version}}},
             {"contentChanges",
              json::array(
                  {{{"range",
@@ -264,19 +252,19 @@ void edit_replace(Editor *editor, Coord start, Coord end, const char *text,
                       {{"line", start.row}, {"character", utf16_start}}},
                      {"end", {{"line", end.row}, {"character", utf16_end}}}}},
                    {"text", std::string(text, len)}}})}}}};
-      lsp_send(editor->lsp, message, nullptr);
+      lsp->send(std::move(message));
     } else {
-      char *buf = read(editor->root, 0, editor->root->char_count);
+      char *buf = read(this->root, 0, this->root->char_count);
       std::string full_text(buf);
       free(buf);
-      json message = {
-          {"jsonrpc", "2.0"},
+      auto message = std::make_unique<LSPMessage>();
+      message->message = {
           {"method", "textDocument/didChange"},
           {"params",
            {{"textDocument",
-             {{"uri", editor->uri}, {"version", ++editor->lsp_version}}},
+             {{"uri", this->uri}, {"version", ++this->lsp_version}}},
             {"contentChanges", json::array({{{"text", full_text}}})}}}};
-      lsp_send(editor->lsp, message, nullptr);
+      lsp->send(std::move(message));
     }
   }
 }
diff --git a/src/editor/editor.cc b/src/editor/editor.cc
index ea09f53..e6e069e 100644
--- a/src/editor/editor.cc
+++ b/src/editor/editor.cc
@@ -5,69 +5,66 @@
 #include "syntax/langs.h"
 #include "utils/utils.h"
 
-Editor *new_editor(const char *filename_arg, Coord position, Coord size,
-                   uint8_t eol) {
-  Editor *editor = new Editor();
-  if (!editor)
-    return nullptr;
+Editor::Editor(const char *filename_arg, uint8_t eol) {
   uint32_t len = 0;
   std::string filename = path_abs(filename_arg);
-  editor->unix_eol = eol & 1;
-  char *str = load_file(filename.c_str(), &len, &editor->unix_eol);
+  this->unix_eol = eol & 1;
+  char *str = load_file(filename.c_str(), &len, &this->unix_eol);
   if (!str) {
     str = (char *)malloc(1);
     *str = '\n';
     len = 1;
   }
   if ((eol >> 1) & 1)
-    editor->unix_eol = eol & 1;
-  editor->filename = filename;
-  editor->uri = path_to_file_uri(filename);
-  editor->position = position;
-  editor->size = size;
-  editor->cursor_preffered = UINT32_MAX;
+    this->unix_eol = eol & 1;
+  this->filename = filename;
+  this->uri = path_to_file_uri(filename);
+  this->cursor_preffered = UINT32_MAX;
   if (len == 0) {
     free(str);
     str = (char *)malloc(1);
     *str = '\n';
     len = 1;
   }
-  editor->root = load(str, len, optimal_chunk_size(len));
+  this->scroll = {0, 0};
+  this->cursor = {0, 0};
+  this->size = {20, 20};
+  this->root = load(str, len, optimal_chunk_size(len));
   free(str);
-  editor->lang = language_for_file(filename.c_str());
-  if (parsers.find(editor->lang.name) != parsers.end())
-    editor->parser = new Parser(editor, editor->lang.name, size.row + 5);
-  if (editor->lang.name == "css" || editor->lang.name == "html" ||
-      editor->lang.name == "javascript" || editor->lang.name == "markdown" ||
-      editor->lang.name == "typescript")
-    editor->is_css_color = true;
-  if (len <= (1024 * 28))
-    request_add_to_lsp(editor->lang, editor);
-  editor->indents.compute_indent(editor);
-  return editor;
+  this->lang = language_for_file(filename.c_str());
+  if (parsers.find(this->lang.name) != parsers.end())
+    this->parser = new Parser(this, this->lang.name, size.row + 5);
+  if (this->lang.name == "css" || this->lang.name == "html" ||
+      this->lang.name == "javascript" || this->lang.name == "markdown" ||
+      this->lang.name == "typescript")
+    this->is_css_color = true;
+  if (len <= (1024 * 28)) {
+    std::lock_guard lock(lsp::lsp_mutex);
+    lsp::new_editors.push_back(this);
+  }
+  this->indents.compute_indent(this);
 }
 
-void free_editor(Editor *editor) {
-  remove_from_lsp(editor);
-  if (editor->parser)
-    delete editor->parser;
-  editor->parser = nullptr;
-  free_rope(editor->root);
-  delete editor;
+Editor::~Editor() {
+  auto lsp = this->lsp.load();
+  if (lsp)
+    lsp->remove(this);
+  if (this->parser)
+    delete this->parser;
+  this->parser = nullptr;
+  free_rope(this->root);
 }
 
-void save_file(Editor *editor) {
-  if (!editor || !editor->root)
+void Editor::save() {
+  if (!this->root)
     return;
-  std::shared_lock lock(editor->knot_mtx);
-  int version = editor->lsp_version;
-  uint32_t char_count = editor->root->char_count;
-  char *str = read(editor->root, 0, char_count);
+  int version = this->lsp_version;
+  uint32_t char_count = this->root->char_count;
+  char *str = read(this->root, 0, char_count);
   if (!str)
     return;
-  lock.unlock();
-  std::ofstream out(editor->filename);
-  if (!editor->unix_eol) {
+  std::ofstream out(this->filename);
+  if (!this->unix_eol) {
     for (uint32_t i = 0; i < char_count; ++i) {
       if (str[i] == '\n')
         out.put('\r');
@@ -78,30 +75,33 @@ void save_file(Editor *editor) {
   }
   out.close();
   free(str);
-  bar.log("Written " + std::to_string(char_count) + " bytes to " +
-          editor->filename);
-  if (editor->lsp) {
-    json save_msg = {{"jsonrpc", "2.0"},
-                     {"method", "textDocument/didSave"},
-                     {"params", {{"textDocument", {{"uri", editor->uri}}}}}};
-    lsp_send(editor->lsp, save_msg, nullptr);
-    if (editor->lsp->allow_formatting) {
-      json msg = {{"jsonrpc", "2.0"},
-                  {"method", "textDocument/formatting"},
-                  {"params",
-                   {{"textDocument", {{"uri", editor->uri}}},
-                    {"options",
-                     {{"tabSize", 2},
-                      {"insertSpaces", true},
-                      {"trimTrailingWhitespace", true},
-                      {"trimFinalNewlines", true}}}}}};
-      LSPPending *pending = new LSPPending();
-      pending->editor = editor;
-      pending->callback = [save_msg, version](Editor *editor,
-                                              const json &message) {
-        if (version != editor->lsp_version)
+  ui::bar.log("Written " + std::to_string(char_count) + " bytes to " +
+              this->filename);
+  auto lsp = this->lsp.load();
+  if (lsp) {
+    log("Saving %s", this->filename.c_str());
+    auto message = std::make_unique<LSPMessage>();
+    message->message = {{"method", "textDocument/didSave"},
+                        {"params", {{"textDocument", {{"uri", this->uri}}}}}};
+    lsp->send(std::move(message));
+    if (lsp->allow_formatting) {
+      log("Formatting %s", this->filename.c_str());
+      json s_msg = {{"method", "textDocument/formatting"},
+                    {"params",
+                     {{"textDocument", {{"uri", this->uri}}},
+                      {"options",
+                       {{"tabSize", 2},
+                        {"insertSpaces", true},
+                        {"trimTrailingWhitespace", true},
+                        {"trimFinalNewlines", true}}}}}};
+      auto save_msg = std::make_unique<LSPMessage>();
+      save_msg->editor = this;
+      save_msg->message = s_msg;
+      save_msg->callback = [s_msg, version](const LSPMessage &msg) {
+        log("Formattin");
+        if (version != msg.editor->lsp_version)
           return;
-        auto &edits = message["result"];
+        auto &edits = msg.message["result"];
         if (edits.is_array()) {
           std::vector<TextEdit> t_edits;
           t_edits.reserve(edits.size());
@@ -112,19 +112,17 @@ void save_file(Editor *editor) {
             t_edit.start.col = edit["range"]["start"]["character"];
             t_edit.end.row = edit["range"]["end"]["line"];
             t_edit.end.col = edit["range"]["end"]["character"];
-            utf8_normalize_edit(editor, &t_edit);
+            msg.editor->utf8_normalize_edit(&t_edit);
             t_edits.push_back(t_edit);
           }
-          apply_lsp_edits(editor, t_edits, false);
-          ensure_scroll(editor);
-          std::shared_lock lock(editor->knot_mtx);
-          uint32_t char_count = editor->root->char_count;
-          char *str = read(editor->root, 0, char_count);
+          msg.editor->apply_lsp_edits(t_edits, false);
+          msg.editor->ensure_cursor();
+          uint32_t char_count = msg.editor->root->char_count;
+          char *str = read(msg.editor->root, 0, char_count);
           if (!str)
             return;
-          lock.unlock();
-          std::ofstream out(editor->filename);
-          if (!editor->unix_eol) {
+          std::ofstream out(msg.editor->filename);
+          if (!msg.editor->unix_eol) {
             for (uint32_t i = 0; i < char_count; ++i) {
               if (str[i] == '\n')
                 out.put('\r');
@@ -135,10 +133,14 @@ void save_file(Editor *editor) {
           }
           out.close();
           free(str);
-          lsp_send(editor->lsp, save_msg, nullptr);
+          auto save_msg = std::make_unique<LSPMessage>();
+          save_msg->editor = msg.editor;
+          save_msg->message = s_msg;
+          save_msg->callback = [](const LSPMessage &) {};
+          msg.editor->lsp.load()->send(std::move(save_msg));
         }
       };
-      lsp_send(editor->lsp, msg, pending);
+      lsp->send(std::move(save_msg));
     }
   }
 }
diff --git a/src/editor/events.cc b/src/editor/events.cc
index a4d1657..c6fe274 100644
--- a/src/editor/events.cc
+++ b/src/editor/events.cc
@@ -1,60 +1,59 @@
 #include "editor/editor.h"
-#include "editor/helpers.h"
+#include "extentions/hover.h"
 #include "io/sysio.h"
 #include "main.h"
 #include "utils/utils.h"
 
-void handle_editor_event(Editor *editor, KeyEvent event) {
+void Editor::handle_event(KeyEvent event) {
   uint8_t old_mode = mode;
-  if (editor->hover_active)
-    editor->hover_active = false;
-  handle_mouse(editor, event);
+  if (this->hover_active)
+    this->hover_active = false;
   if (event.key_type == KEY_SPECIAL) {
     switch (event.special_modifier) {
     case 0:
       switch (event.special_key) {
       case KEY_DOWN:
-        cursor_down(editor, 1);
+        this->cursor_down(1);
         break;
       case KEY_UP:
-        cursor_up(editor, 1);
+        this->cursor_up(1);
         break;
       case KEY_LEFT:
-        cursor_left(editor, 1);
+        this->cursor_left(1);
         break;
       case KEY_RIGHT:
-        cursor_right(editor, 1);
+        this->cursor_right(1);
         break;
       }
       break;
     case CNTRL:
       switch (event.special_key) {
       case KEY_DOWN:
-        cursor_down(editor, 5);
+        this->cursor_down(5);
         break;
       case KEY_UP:
-        cursor_up(editor, 5);
+        this->cursor_up(5);
         break;
       case KEY_LEFT:
-        cursor_prev_word(editor);
+        this->cursor_prev_word();
       case KEY_RIGHT:
-        cursor_next_word(editor);
+        this->cursor_next_word();
         break;
       }
       break;
     case ALT:
       switch (event.special_key) {
       case KEY_DOWN:
-        move_line_down(editor);
+        this->move_line_down();
         break;
       case KEY_UP:
-        move_line_up(editor);
+        this->move_line_up();
         break;
       case KEY_LEFT:
-        cursor_left(editor, 8);
+        this->cursor_left(8);
         break;
       case KEY_RIGHT:
-        cursor_right(editor, 8);
+        this->cursor_right(8);
         break;
       }
       break;
@@ -65,86 +64,86 @@ void handle_editor_event(Editor *editor, KeyEvent event) {
     if (event.key_type == KEY_CHAR && event.len == 1) {
       switch (event.c[0]) {
       case 'u':
-        select_all(editor);
+        this->select_all();
         break;
       case CTRL('h'):
-        editor->hover.scroll(-1);
-        editor->hover_active = true;
+        static_cast<HoverBox *>(ui::hover_popup->tile.get())->scroll(-1);
+        this->hover_active = true;
         break;
       case CTRL('l'):
-        editor->hover.scroll(1);
-        editor->hover_active = true;
+        static_cast<HoverBox *>(ui::hover_popup->tile.get())->scroll(1);
+        this->hover_active = true;
         break;
       case 'h':
-        fetch_lsp_hover(editor);
+        this->fetch_lsp_hover();
         break;
       case 'a': {
         mode = INSERT;
-        Coord start = editor->cursor;
-        cursor_right(editor, 1);
-        if (start.row != editor->cursor.row)
-          cursor_left(editor, 1);
+        Coord start = this->cursor;
+        this->cursor_right(1);
+        if (start.row != this->cursor.row)
+          this->cursor_left(1);
       } break;
       case 'i':
         mode = INSERT;
         break;
       case 'n':
         mode = JUMPER;
-        editor->jumper_set = true;
+        this->jumper_set = true;
         break;
       case 'm':
         mode = JUMPER;
-        editor->jumper_set = false;
+        this->jumper_set = false;
         break;
       case 'N':
-        clear_hooks_at_line(editor, editor->cursor.row);
+        this->clear_hooks_at_line(this->cursor.row);
         break;
       case 's':
       case 'v':
         mode = SELECT;
-        editor->selection_active = true;
-        editor->selection = editor->cursor;
-        editor->selection_type = CHAR;
+        this->selection_active = true;
+        this->selection = this->cursor;
+        this->selection_type = CHAR;
         break;
       case ';':
       case ':':
         mode = RUNNER;
         break;
       case 0x7F:
-        cursor_left(editor, 1);
+        this->cursor_left(1);
         break;
       case ' ':
-        cursor_right(editor, 1);
+        this->cursor_right(1);
         break;
       case '\r':
       case '\n':
-        cursor_down(editor, 1);
+        this->cursor_down(1);
         break;
       case '\\':
       case '|':
-        cursor_up(editor, 1);
+        this->cursor_up(1);
         break;
       case CTRL('d'):
-        scroll_down(editor, 1);
-        ensure_cursor(editor);
+        this->scroll_down(1);
+        this->ensure_cursor();
         break;
       case CTRL('u'):
-        scroll_up(editor, 1);
-        ensure_cursor(editor);
+        this->scroll_up(1);
+        this->ensure_cursor();
         break;
       case '>':
       case '.':
-        indent_current_line(editor);
+        this->indent_current_line();
         break;
       case '<':
       case ',':
-        dedent_current_line(editor);
+        this->dedent_current_line();
         break;
       case CTRL('s'):
-        save_file(editor);
+        this->save();
         break;
       case 'p':
-        paste(editor);
+        this->paste();
         break;
       }
     }
@@ -153,34 +152,34 @@ void handle_editor_event(Editor *editor, KeyEvent event) {
     if (event.key_type == KEY_CHAR) {
       if (event.len == 1) {
         if (event.c[0] == '\t') {
-          editor->indents.insert_tab(editor->cursor);
+          this->indents.insert_tab(this->cursor);
         } else if (event.c[0] == '\n' || event.c[0] == '\r') {
-          editor->indents.insert_new_line(editor->cursor);
+          this->indents.insert_new_line(this->cursor);
         } else if (event.c[0] == CTRL('W')) {
-          delete_prev_word(editor);
+          this->delete_prev_word();
         } else if (isprint((unsigned char)(event.c[0]))) {
-          insert_char(editor, event.c[0]);
+          this->insert_char(event.c[0]);
         } else if (event.c[0] == 0x7F || event.c[0] == 0x08) {
-          backspace_edit(editor);
+          this->backspace_edit();
         } else if (event.c[0] == 0x1B) {
-          normal_mode(editor);
+          this->normal_mode();
         }
       } else if (event.len > 1) {
-        edit_insert(editor, editor->cursor, event.c, event.len);
-        cursor_right(editor, 1);
+        this->edit_insert(this->cursor, event.c, event.len);
+        this->cursor_right(1);
       }
     } else if (event.key_type == KEY_SPECIAL &&
                event.special_key == KEY_DELETE) {
       switch (event.special_modifier) {
       case 0:
-        edit_erase(editor, editor->cursor, 1);
+        this->edit_erase(this->cursor, 1);
         break;
       case CNTRL:
-        delete_next_word(editor);
+        this->delete_next_word();
         break;
       }
     } else if (event.key_type == KEY_PASTE) {
-      insert_str(editor, event.c, event.len);
+      this->insert_str(event.c, event.len);
     }
     break;
   case SELECT:
@@ -189,28 +188,28 @@ void handle_editor_event(Editor *editor, KeyEvent event) {
       case 0x1B:
       case 's':
       case 'v':
-        editor->selection_active = false;
+        this->selection_active = false;
         mode = NORMAL;
         break;
       case 'y':
-        copy(editor);
+        this->copy();
         mode = NORMAL;
         break;
       case 'x':
-        cut(editor);
+        this->cut();
         mode = NORMAL;
         break;
       case 'p':
-        paste(editor);
+        this->paste();
         mode = NORMAL;
         break;
       case '<':
       case ',':
-        dedent_selection(editor);
+        this->dedent_selection();
         break;
       case '>':
       case '.':
-        indent_selection(editor);
+        this->indent_selection();
         break;
       }
     }
@@ -218,25 +217,25 @@ void handle_editor_event(Editor *editor, KeyEvent event) {
   case JUMPER:
     if (event.key_type == KEY_CHAR && event.len == 1 &&
         (event.c[0] >= '!' && event.c[0] <= '~')) {
-      if (editor->jumper_set) {
+      if (this->jumper_set) {
         for (uint8_t i = 0; i < 94; i++)
-          if (editor->hooks[i] == editor->cursor.row + 1) {
-            editor->hooks[i] = 0;
+          if (this->hooks[i] == this->cursor.row + 1) {
+            this->hooks[i] = 0;
             break;
           }
-        editor->hooks[event.c[0] - '!'] = editor->cursor.row + 1;
+        this->hooks[event.c[0] - '!'] = this->cursor.row + 1;
       } else {
-        uint32_t line = editor->hooks[event.c[0] - '!'] - 1;
+        uint32_t line = this->hooks[event.c[0] - '!'] - 1;
         if (line > 0) {
-          editor->cursor = {line, 0};
-          editor->cursor_preffered = UINT32_MAX;
+          this->cursor = {line, 0};
+          this->cursor_preffered = UINT32_MAX;
         }
       }
     }
     mode = NORMAL;
     break;
   }
-  if (old_mode == mode || mode != INSERT)
-    handle_completion(editor, event);
-  ensure_scroll(editor);
+  // if (old_mode == mode || mode != INSERT)
+  //   this->completion.handle(event);
+  this->ensure_scroll();
 }
diff --git a/src/editor/helpers.cc b/src/editor/helpers.cc
index 99f7f9a..f4adf3c 100644
--- a/src/editor/helpers.cc
+++ b/src/editor/helpers.cc
@@ -1,86 +1,83 @@
 #include "editor/helpers.h"
 #include "editor/editor.h"
+#include "extentions/hover.h"
 #include "io/sysio.h"
 #include "lsp/lsp.h"
 #include "main.h"
 #include "utils/utils.h"
-#include <sys/types.h>
 
-void cut(Editor *editor) {
-  if (ABS((int64_t)editor->cursor.row - (int64_t)editor->selection.row) >
-      1500) {
-    bar.log("Selection too large!");
+void Editor::cut() {
+  if (ABS((int64_t)this->cursor.row - (int64_t)this->selection.row) > 1500) {
+    ui::bar.log("Selection too large!");
     return;
   }
   if (mode != SELECT)
     return;
   Coord start;
   uint32_t len;
-  char *text = get_selection(editor, &len, &start);
+  char *text = this->get_selection(&len, &start);
   ruby_copy(text, len);
   len = count_clusters(text, len, 0, len);
-  edit_erase(editor, start, len);
+  this->edit_erase(start, len);
   free(text);
-  editor->selection_active = false;
+  this->selection_active = false;
 }
 
-void copy(Editor *editor) {
-  if (ABS((int64_t)editor->cursor.row - (int64_t)editor->selection.row) >
-      1500) {
-    bar.log("Selection too large!");
+void Editor::copy() {
+  if (ABS((int64_t)this->cursor.row - (int64_t)this->selection.row) > 1500) {
+    ui::bar.log("Selection too large!");
     return;
   }
   if (mode != SELECT)
     return;
   uint32_t len;
-  char *text = get_selection(editor, &len, nullptr);
+  char *text = this->get_selection(&len, nullptr);
   ruby_copy(text, len);
   free(text);
-  editor->selection_active = false;
+  this->selection_active = false;
 }
 
-void paste(Editor *editor) {
+void Editor::paste() {
   if (mode == NORMAL) {
     std::string text = ruby_paste();
     if (text.empty())
       return;
-    insert_str(editor, (char *)text.c_str(), text.length());
+    this->insert_str((char *)text.c_str(), text.length());
   } else if (mode == SELECT) {
     std::string text = ruby_paste();
     if (!text.empty()) {
       Coord start, end;
-      selection_bounds(editor, &start, &end);
+      this->selection_bounds(&start, &end);
       uint32_t start_byte =
-          line_to_byte(editor->root, start.row, nullptr) + start.col;
-      uint32_t end_byte =
-          line_to_byte(editor->root, end.row, nullptr) + end.col;
-      edit_erase(editor, start, end_byte - start_byte);
-      edit_insert(editor, editor->cursor, (char *)text.c_str(), text.length());
+          line_to_byte(this->root, start.row, nullptr) + start.col;
+      uint32_t end_byte = line_to_byte(this->root, end.row, nullptr) + end.col;
+      this->edit_erase(start, end_byte - start_byte);
+      this->edit_insert(this->cursor, (char *)text.c_str(), text.length());
     }
-    editor->selection_active = false;
+    this->selection_active = false;
   }
 }
 
-void insert_str(Editor *editor, char *c, uint32_t len) {
+void Editor::insert_str(char *c, uint32_t len) {
   if (c) {
-    edit_insert(editor, editor->cursor, c, len);
+    this->edit_insert(this->cursor, c, len);
     uint32_t grapheme_len = count_clusters(c, len, 0, len);
-    cursor_right(editor, grapheme_len);
+    this->cursor_right(grapheme_len);
   }
 }
 
-void indent_current_line(Editor *editor) {
-  Coord start = editor->cursor;
-  uint32_t delta = editor->indents.indent_line(editor->cursor.row);
-  editor->cursor.col = start.col + delta;
-  editor->cursor.row = start.row;
+void Editor::indent_current_line() {
+  Coord start = this->cursor;
+  uint32_t delta = this->indents.indent_line(this->cursor.row);
+  this->cursor.col = start.col + delta;
+  this->cursor.row = start.row;
 }
 
-void dedent_current_line(Editor *editor) {
-  Coord start = editor->cursor;
-  uint32_t delta = editor->indents.dedent_line(editor->cursor.row);
-  editor->cursor.col = MAX((int64_t)start.col - delta, 0);
-  editor->cursor.row = start.row;
+void Editor::dedent_current_line() {
+  Coord start = this->cursor;
+  uint32_t delta = this->indents.dedent_line(this->cursor.row);
+  this->cursor.col = MAX((int64_t)start.col - delta, 0);
+  this->cursor.row = start.row;
 }
 
 static void move_coord_by_delta(Coord &c, uint32_t row, int64_t delta) {
@@ -90,49 +87,49 @@ static void move_coord_by_delta(Coord &c, uint32_t row, int64_t delta) {
   }
 }
 
-void indent_selection(Editor *editor) {
-  uint32_t top = MIN(editor->cursor.row, editor->selection.row);
-  uint32_t bot = MAX(editor->cursor.row, editor->selection.row);
+void Editor::indent_selection() {
+  uint32_t top = MIN(this->cursor.row, this->selection.row);
+  uint32_t bot = MAX(this->cursor.row, this->selection.row);
   if (bot - top > 1500) {
-    bar.log("Can't indent more than 1500 lines at once!");
+    ui::bar.log("Can't indent more than 1500 lines at once!");
     return;
   }
   if (bot - top >= 2)
-    editor->indents.indent_block(top + 1, bot - 1);
-  uint32_t delta_top = editor->indents.indent_line(top);
+    this->indents.indent_block(top + 1, bot - 1);
+  uint32_t delta_top = this->indents.indent_line(top);
   uint32_t delta_bot =
-      (bot == top) ? delta_top : editor->indents.indent_line(bot);
-  move_coord_by_delta(editor->cursor, top, delta_top);
-  move_coord_by_delta(editor->selection, top, delta_top);
+      (bot == top) ? delta_top : this->indents.indent_line(bot);
+  move_coord_by_delta(this->cursor, top, delta_top);
+  move_coord_by_delta(this->selection, top, delta_top);
   if (bot != top) {
-    move_coord_by_delta(editor->cursor, bot, delta_bot);
-    move_coord_by_delta(editor->selection, bot, delta_bot);
+    move_coord_by_delta(this->cursor, bot, delta_bot);
+    move_coord_by_delta(this->selection, bot, delta_bot);
   }
 }
 
-void dedent_selection(Editor *editor) {
-  uint32_t top = MIN(editor->cursor.row, editor->selection.row);
-  uint32_t bot = MAX(editor->cursor.row, editor->selection.row);
+void Editor::dedent_selection() {
+  uint32_t top = MIN(this->cursor.row, this->selection.row);
+  uint32_t bot = MAX(this->cursor.row, this->selection.row);
   if (bot - top > 1500) {
-    bar.log("Can't dedent more than 1500 lines at once!");
+    ui::bar.log("Can't dedent more than 1500 lines at once!");
     return;
   }
   if (bot - top >= 2)
-    editor->indents.dedent_block(top + 1, bot - 1);
-  uint32_t delta_top = editor->indents.dedent_line(top);
+    this->indents.dedent_block(top + 1, bot - 1);
+  uint32_t delta_top = this->indents.dedent_line(top);
   uint32_t delta_bot =
-      (bot == top) ? delta_top : editor->indents.dedent_line(bot);
-  move_coord_by_delta(editor->cursor, top, -(int64_t)delta_top);
-  move_coord_by_delta(editor->selection, top, -(int64_t)delta_top);
+      (bot == top) ? delta_top : this->indents.dedent_line(bot);
+  move_coord_by_delta(this->cursor, top, -(int64_t)delta_top);
+  move_coord_by_delta(this->selection, top, -(int64_t)delta_top);
   if (bot != top) {
-    move_coord_by_delta(editor->cursor, bot, -(int64_t)delta_bot);
-    move_coord_by_delta(editor->selection, bot, -(int64_t)delta_bot);
+    move_coord_by_delta(this->cursor, bot, -(int64_t)delta_bot);
+    move_coord_by_delta(this->selection, bot, -(int64_t)delta_bot);
   }
 }
 
-void insert_char(Editor *editor, char c) {
-  uint32_t col = editor->cursor.col;
-  LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+void Editor::insert_char(char c) {
+  uint32_t col = this->cursor.col;
+  LineIterator *it = begin_l_iter(this->root, this->cursor.row);
   if (!it)
     return;
   uint32_t len;
@@ -148,7 +145,7 @@ void insert_char(Editor *editor, char c) {
     if ((c == '}' && next == '}') || (c == ')' && next == ')') ||
         (c == ']' && next == ']') || (c == '"' && next == '"') ||
         (c == '\'' && next == '\'')) {
-      cursor_right(editor, 1);
+      this->cursor_right(1);
       skip_insert = true;
     }
   }
@@ -175,16 +172,17 @@ void insert_char(Editor *editor, char c) {
     }
     if (closing) {
       char pair[2] = {c, closing};
-      edit_insert(editor, editor->cursor, pair, 2);
-      cursor_right(editor, 1);
+      this->edit_insert(this->cursor, pair, 2);
+      this->cursor_right(1);
     } else {
-      edit_insert(editor, editor->cursor, &c, 1);
-      cursor_right(editor, 1);
+      this->edit_insert(this->cursor, &c, 1);
+      this->cursor_right(1);
     }
-    if (editor->lsp && editor->lsp->allow_formatting_on_type) {
-      for (char ch : editor->lsp->format_chars) {
+    auto lsp = this->lsp.load();
+    if (lsp && lsp->allow_formatting_on_type) {
+      for (char ch : lsp->format_chars) {
         if (ch == c) {
-          LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+          LineIterator *it = begin_l_iter(this->root, this->cursor.row);
           if (!it)
             return;
           uint32_t len;
@@ -194,29 +192,27 @@ void insert_char(Editor *editor, char c) {
             free(it);
             return;
           }
-          uint32_t col = utf8_offset_to_utf16(line, len, editor->cursor.col);
+          uint32_t col = utf8_offset_to_utf16(line, len, this->cursor.col);
           free(it->buffer);
           free(it);
-          int version = editor->lsp_version;
-          json message = {
-              {"jsonrpc", "2.0"},
+          int version = this->lsp_version;
+          auto message = std::make_unique<LSPMessage>();
+          message->message = {
               {"method", "textDocument/onTypeFormatting"},
               {"params",
-               {{"textDocument", {{"uri", editor->uri}}},
-                {"position",
-                 {{"line", editor->cursor.row}, {"character", col}}},
+               {{"textDocument", {{"uri", this->uri}}},
+                {"position", {{"line", this->cursor.row}, {"character", col}}},
                 {"ch", std::string(1, c)},
                 {"options",
                  {{"tabSize", 2},
                   {"insertSpaces", true},
                   {"trimTrailingWhitespace", true},
                   {"trimFinalNewlines", true}}}}}};
-          LSPPending *pending = new LSPPending();
-          pending->editor = editor;
-          pending->callback = [version](Editor *editor, const json &message) {
-            if (version != editor->lsp_version)
+          message->editor = this;
+          message->callback = [version](const LSPMessage &message) {
+            if (version != message.editor->lsp_version)
               return;
-            auto &edits = message["result"];
+            auto &edits = message.message["result"];
             if (edits.is_array()) {
               std::vector<TextEdit> t_edits;
               t_edits.reserve(edits.size());
@@ -227,14 +223,14 @@ void insert_char(Editor *editor, char c) {
                 t_edit.start.col = edit["range"]["start"]["character"];
                 t_edit.end.row = edit["range"]["end"]["line"];
                 t_edit.end.col = edit["range"]["end"]["character"];
-                utf8_normalize_edit(editor, &t_edit);
+                message.editor->utf8_normalize_edit(&t_edit);
                 t_edits.push_back(t_edit);
               }
-              apply_lsp_edits(editor, t_edits, false);
-              ensure_scroll(editor);
+              message.editor->apply_lsp_edits(t_edits, false);
+              message.editor->ensure_scroll();
             }
           };
-          lsp_send(editor->lsp, message, pending);
+          lsp->send(std::move(message));
           break;
         }
       }
@@ -242,19 +238,19 @@ void insert_char(Editor *editor, char c) {
   }
 }
 
-void normal_mode(Editor *editor) {
-  Coord prev_pos = editor->cursor;
+void Editor::normal_mode() {
+  Coord prev_pos = this->cursor;
   mode = NORMAL;
-  cursor_left(editor, 1);
-  if (prev_pos.row != editor->cursor.row)
-    cursor_right(editor, 1);
+  this->cursor_left(1);
+  if (prev_pos.row != this->cursor.row)
+    this->cursor_right(1);
 }
 
-void backspace_edit(Editor *editor) {
-  Coord prev_pos = editor->cursor;
+void Editor::backspace_edit() {
+  Coord prev_pos = this->cursor;
   if (prev_pos.col > 0)
     prev_pos.col--;
-  LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+  LineIterator *it = begin_l_iter(this->root, this->cursor.row);
   if (!it)
     return;
   uint32_t len;
@@ -267,11 +263,11 @@ void backspace_edit(Editor *editor) {
   if (len > 0 && line[len - 1] == '\n')
     --len;
   char prev_char = (prev_pos.col < len) ? line[prev_pos.col] : 0;
-  char next_char = (editor->cursor.col < len) ? line[editor->cursor.col] : 0;
+  char next_char = (this->cursor.col < len) ? line[this->cursor.col] : 0;
   bool before_content = false;
-  if (editor->cursor.col > 0) {
+  if (this->cursor.col > 0) {
     before_content = true;
-    for (uint32_t i = 0; i < editor->cursor.col; i++)
+    for (uint32_t i = 0; i < this->cursor.col; i++)
       if (line[i] != ' ' && line[i] != '\t') {
         before_content = false;
         break;
@@ -280,7 +276,7 @@ void backspace_edit(Editor *editor) {
   free(it->buffer);
   free(it);
   if (before_content) {
-    dedent_current_line(editor);
+    this->dedent_current_line();
     return;
   }
   bool is_pair = (prev_char == '{' && next_char == '}') ||
@@ -289,65 +285,65 @@ void backspace_edit(Editor *editor) {
                  (prev_char == '"' && next_char == '"') ||
                  (prev_char == '\'' && next_char == '\'');
   if (is_pair) {
-    edit_erase(editor, editor->cursor, 1);
-    edit_erase(editor, prev_pos, 1);
+    this->edit_erase(this->cursor, 1);
+    this->edit_erase(prev_pos, 1);
   } else {
-    edit_erase(editor, editor->cursor, -1);
+    this->edit_erase(this->cursor, -1);
   }
 }
 
-void delete_prev_word(Editor *editor) {
+void Editor::delete_prev_word() {
   uint32_t prev_col_byte, prev_col_cluster;
-  word_boundaries(editor, editor->cursor, &prev_col_byte, nullptr,
-                  &prev_col_cluster, nullptr);
-  if (prev_col_byte == editor->cursor.col)
-    edit_erase(editor, editor->cursor, -1);
+  this->word_boundaries(this->cursor, &prev_col_byte, nullptr,
+                        &prev_col_cluster, nullptr);
+  if (prev_col_byte == this->cursor.col)
+    this->edit_erase(this->cursor, -1);
   else
-    edit_erase(editor, editor->cursor, -(int64_t)prev_col_cluster);
+    this->edit_erase(this->cursor, -(int64_t)prev_col_cluster);
 }
 
-void delete_next_word(Editor *editor) {
+void Editor::delete_next_word() {
   uint32_t next_col_byte, next_col_cluster;
-  word_boundaries(editor, editor->cursor, nullptr, &next_col_byte, nullptr,
-                  &next_col_cluster);
-  if (next_col_byte == editor->cursor.col)
-    edit_erase(editor, editor->cursor, 1);
+  this->word_boundaries(this->cursor, nullptr, &next_col_byte, nullptr,
+                        &next_col_cluster);
+  if (next_col_byte == this->cursor.col)
+    this->edit_erase(this->cursor, 1);
   else
-    edit_erase(editor, editor->cursor, next_col_cluster);
+    this->edit_erase(this->cursor, next_col_cluster);
 }
 
-void clear_hooks_at_line(Editor *editor, uint32_t line) {
+void Editor::clear_hooks_at_line(uint32_t line) {
   for (uint8_t i = 0; i < 94; i++)
-    if (editor->hooks[i] == line + 1) {
-      editor->hooks[i] = 0;
+    if (this->hooks[i] == line + 1) {
+      this->hooks[i] = 0;
       break;
     }
 }
 
-void cursor_prev_word(Editor *editor) {
+void Editor::cursor_prev_word() {
   uint32_t prev_col;
-  word_boundaries(editor, editor->cursor, &prev_col, nullptr, nullptr, nullptr);
-  editor->cursor_preffered = UINT32_MAX;
-  if (prev_col == editor->cursor.col)
-    cursor_left(editor, 1);
+  word_boundaries(this->cursor, &prev_col, nullptr, nullptr, nullptr);
+  this->cursor_preffered = UINT32_MAX;
+  if (prev_col == this->cursor.col)
+    cursor_left(1);
   else
-    editor->cursor = {editor->cursor.row, prev_col};
+    this->cursor = {this->cursor.row, prev_col};
 }
 
-void cursor_next_word(Editor *editor) {
+void Editor::cursor_next_word() {
   uint32_t next_col;
-  word_boundaries(editor, editor->cursor, nullptr, &next_col, nullptr, nullptr);
-  editor->cursor_preffered = UINT32_MAX;
-  if (next_col == editor->cursor.col)
-    cursor_right(editor, 1);
+  word_boundaries(this->cursor, nullptr, &next_col, nullptr, nullptr);
+  this->cursor_preffered = UINT32_MAX;
+  if (next_col == this->cursor.col)
+    this->cursor_right(1);
   else
-    editor->cursor = {editor->cursor.row, next_col};
+    this->cursor = {this->cursor.row, next_col};
 }
 
-void select_all(Editor *editor) {
-  if (editor->root->line_count > 0) {
-    editor->cursor.row = editor->root->line_count - 1;
-    LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+void Editor::select_all() {
+  if (this->root->line_count > 0) {
+    this->cursor.row = this->root->line_count - 1;
+    LineIterator *it = begin_l_iter(this->root, this->cursor.row);
     if (!it)
       return;
     uint32_t line_len;
@@ -359,18 +355,19 @@ void select_all(Editor *editor) {
     line_len = count_clusters(line, line_len, 0, line_len);
     free(it->buffer);
     free(it);
-    editor->cursor.col = line_len;
-    editor->cursor_preffered = UINT32_MAX;
+    this->cursor.col = line_len;
+    this->cursor_preffered = UINT32_MAX;
     mode = SELECT;
-    editor->selection_active = true;
-    editor->selection = {0, 0};
-    editor->selection_type = LINE;
+    this->selection_active = true;
+    this->selection = {0, 0};
+    this->selection_type = LINE;
   }
 }
 
-void fetch_lsp_hover(Editor *editor) {
-  if (editor->lsp && editor->lsp->allow_hover) {
-    LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+void Editor::fetch_lsp_hover() {
+  auto lsp = this->lsp.load();
+  if (lsp && lsp->allow_hover) {
+    LineIterator *it = begin_l_iter(this->root, this->cursor.row);
     uint32_t line_len;
     char *line = next_line(it, &line_len);
     if (!line) {
@@ -378,18 +375,18 @@ void fetch_lsp_hover(Editor *editor) {
       free(it);
       return;
     }
-    uint32_t col = utf8_offset_to_utf16(line, line_len, editor->cursor.col);
+    uint32_t col = utf8_offset_to_utf16(line, line_len, this->cursor.col);
     free(it->buffer);
     free(it);
-    json hover_request = {
-        {"jsonrpc", "2.0"},
+    auto message = std::make_unique<LSPMessage>();
+    message->message = {
         {"method", "textDocument/hover"},
         {"params",
-         {{"textDocument", {{"uri", editor->uri}}},
-          {"position", {{"line", editor->cursor.row}, {"character", col}}}}}};
-    LSPPending *pending = new LSPPending();
-    pending->editor = editor;
-    pending->callback = [](Editor *editor, const json &hover) {
+         {{"textDocument", {{"uri", this->uri}}},
+          {"position", {{"line", this->cursor.row}, {"character", col}}}}}};
+    message->editor = this;
+    message->callback = [](const LSPMessage &message) {
+      auto &hover = message.message;
       if (hover.contains("result") && !hover["result"].is_null()) {
         auto &contents = hover["result"]["contents"];
         std::string hover_text = "";
@@ -413,19 +410,21 @@ void fetch_lsp_hover(Editor *editor) {
           hover_text += contents.get<std::string>();
         }
         if (!hover_text.empty()) {
-          editor->hover.clear();
-          editor->hover.text = clean_text(hover_text);
-          editor->hover.is_markup = is_markup;
-          editor->hover.render_first();
-          editor->hover_active = true;
+          auto hover_box = static_cast<HoverBox *>(ui::hover_popup->tile.get());
+          hover_box->clear();
+          hover_box->text = clean_text(hover_text);
+          hover_box->is_markup = is_markup;
+          message.editor->hover_active = true;
         }
       }
     };
-    lsp_send(editor->lsp, hover_request, pending);
+    lsp->send(std::move(message));
   }
 }
 
-void handle_mouse(Editor *editor, KeyEvent event) {
+void Editor::handle_click(KeyEvent event, Coord size) {
+  focused_window = this;
+  this->size = size;
   static std::chrono::steady_clock::time_point last_click_time =
       std::chrono::steady_clock::now();
   static uint32_t click_count = 0;
@@ -439,18 +438,18 @@ void handle_mouse(Editor *editor, KeyEvent event) {
     case SCROLL:
       switch (event.mouse_direction) {
       case SCROLL_UP:
-        scroll_up(editor, 4);
-        ensure_cursor(editor);
+        this->scroll_up(4);
+        this->ensure_cursor();
         break;
       case SCROLL_DOWN:
-        scroll_down(editor, 4);
-        ensure_cursor(editor);
+        this->scroll_down(4);
+        this->ensure_cursor();
         break;
       case SCROLL_LEFT:
-        cursor_left(editor, 10);
+        this->cursor_left(10);
         break;
       case SCROLL_RIGHT:
-        cursor_right(editor, 10);
+        this->cursor_right(10);
         break;
       }
       break;
@@ -463,35 +462,35 @@ void handle_mouse(Editor *editor, KeyEvent event) {
           click_count = 1;
         last_click_time = now;
         last_click_pos = cur_pos;
-        Coord p = editor_hit_test(editor, event.mouse_x, event.mouse_y);
+        Coord p = this->click_coord(event.mouse_x, event.mouse_y);
         if (p.row == UINT32_MAX && p.col == UINT32_MAX)
           return;
-        editor->cursor_preffered = UINT32_MAX;
+        this->cursor_preffered = UINT32_MAX;
         if (click_count == 1) {
-          editor->cursor = p;
-          editor->selection = p;
+          this->cursor = p;
+          this->selection = p;
           if (mode == SELECT) {
             mode = NORMAL;
-            editor->selection_active = false;
+            this->selection_active = false;
           }
         } else if (click_count == 2) {
           uint32_t prev_col, next_col;
-          word_boundaries(editor, editor->cursor, &prev_col, &next_col, nullptr,
-                          nullptr);
-          if (editor->cursor < editor->selection)
-            editor->cursor = {editor->cursor.row, prev_col};
+          this->word_boundaries(this->cursor, &prev_col, &next_col, nullptr,
+                                nullptr);
+          if (this->cursor < this->selection)
+            this->cursor = {this->cursor.row, prev_col};
           else
-            editor->cursor = {editor->cursor.row, next_col};
-          editor->cursor_preffered = UINT32_MAX;
-          editor->selection_type = WORD;
+            this->cursor = {this->cursor.row, next_col};
+          this->cursor_preffered = UINT32_MAX;
+          this->selection_type = WORD;
           mode = SELECT;
-          editor->selection_active = true;
+          this->selection_active = true;
         } else if (click_count >= 3) {
-          if (editor->cursor < editor->selection) {
-            editor->cursor = {p.row, 0};
+          if (this->cursor < this->selection) {
+            this->cursor = {p.row, 0};
           } else {
             uint32_t line_len;
-            LineIterator *it = begin_l_iter(editor->root, p.row);
+            LineIterator *it = begin_l_iter(this->root, p.row);
             char *line = next_line(it, &line_len);
             if (!line)
               return;
@@ -499,44 +498,44 @@ void handle_mouse(Editor *editor, KeyEvent event) {
               line_len--;
             free(it->buffer);
             free(it);
-            editor->cursor = {p.row, line_len};
+            this->cursor = {p.row, line_len};
           }
-          editor->cursor_preffered = UINT32_MAX;
-          editor->selection_type = LINE;
+          this->cursor_preffered = UINT32_MAX;
+          this->selection_type = LINE;
           mode = SELECT;
-          editor->selection_active = true;
+          this->selection_active = true;
           click_count = 3;
         }
       }
       break;
     case DRAG:
       if (event.mouse_button == LEFT_BTN) {
-        Coord p = editor_hit_test(editor, event.mouse_x, event.mouse_y);
+        Coord p = this->click_coord(event.mouse_x, event.mouse_y);
         if (p.row == UINT32_MAX && p.col == UINT32_MAX)
           return;
-        editor->cursor_preffered = UINT32_MAX;
+        this->cursor_preffered = UINT32_MAX;
         mode = SELECT;
-        if (!editor->selection_active) {
-          editor->selection_active = true;
-          editor->selection_type = CHAR;
+        if (!this->selection_active) {
+          this->selection_active = true;
+          this->selection_type = CHAR;
         }
         uint32_t prev_col, next_col, line_len;
-        switch (editor->selection_type) {
+        switch (this->selection_type) {
         case CHAR:
-          editor->cursor = p;
+          this->cursor = p;
           break;
         case WORD:
-          word_boundaries(editor, p, &prev_col, &next_col, nullptr, nullptr);
-          if (editor->cursor < editor->selection)
-            editor->cursor = {p.row, prev_col};
+          this->word_boundaries(p, &prev_col, &next_col, nullptr, nullptr);
+          if (this->cursor < this->selection)
+            this->cursor = {p.row, prev_col};
           else
-            editor->cursor = {p.row, next_col};
+            this->cursor = {p.row, next_col};
           break;
         case LINE:
-          if (editor->cursor < editor->selection) {
-            editor->cursor = {p.row, 0};
+          if (this->cursor < this->selection) {
+            this->cursor = {p.row, 0};
           } else {
-            LineIterator *it = begin_l_iter(editor->root, p.row);
+            LineIterator *it = begin_l_iter(this->root, p.row);
             char *line = next_line(it, &line_len);
             if (!line)
               return;
@@ -544,7 +543,7 @@ void handle_mouse(Editor *editor, KeyEvent event) {
               line_len--;
             free(it->buffer);
             free(it);
-            editor->cursor = {p.row, line_len};
+            this->cursor = {p.row, line_len};
           }
           break;
         }
@@ -552,10 +551,10 @@ void handle_mouse(Editor *editor, KeyEvent event) {
       break;
     case RELEASE:
       if (event.mouse_button == LEFT_BTN)
-        if (editor->cursor.row == editor->selection.row &&
-            editor->cursor.col == editor->selection.col) {
+        if (this->cursor.row == this->selection.row &&
+            this->cursor.col == this->selection.col) {
           mode = NORMAL;
-          editor->selection_active = false;
+          this->selection_active = false;
         }
       break;
     }
diff --git a/src/editor/indents.cc b/src/editor/indents.cc
index 91799d6..db94ac9 100644
--- a/src/editor/indents.cc
+++ b/src/editor/indents.cc
@@ -68,7 +68,6 @@ uint32_t IndentationEngine::indent_real(char *line, uint32_t len) {
 }
 
 uint32_t IndentationEngine::indent_expected(uint32_t row) {
-  std::shared_lock lock(editor->knot_mtx);
   uint32_t line_idx = row;
   if (row == 0)
     return 0;
@@ -109,7 +108,6 @@ uint32_t IndentationEngine::indent_expected(uint32_t row) {
 }
 
 uint32_t IndentationEngine::set_indent(uint32_t row, int64_t new_indent) {
-  std::shared_lock lock(editor->knot_mtx);
   LineIterator *it = begin_l_iter(editor->root, row);
   if (!it)
     return 0;
@@ -122,7 +120,6 @@ uint32_t IndentationEngine::set_indent(uint32_t row, int64_t new_indent) {
   }
   if (len > 0 && line[len - 1] == '\n')
     --len;
-  lock.unlock();
   if (new_indent <= 0)
     new_indent = 0;
   uint32_t ws_len = 0;
@@ -135,14 +132,13 @@ uint32_t IndentationEngine::set_indent(uint32_t row, int64_t new_indent) {
     new_ws.assign(new_indent * indent, ' ');
   Coord start = {row, 0};
   Coord end = {row, ws_len};
-  edit_replace(editor, start, end, new_ws.c_str(), new_ws.length());
+  editor->edit_replace(start, end, new_ws.c_str(), new_ws.length());
   free(it->buffer);
   free(it);
   return len - ws_len + (new_indent * indent);
 }
 
 uint32_t IndentationEngine::indent_line(uint32_t row) {
-  std::shared_lock lock(editor->knot_mtx);
   LineIterator *it = begin_l_iter(editor->root, row);
   if (!it)
     return 0;
@@ -153,7 +149,6 @@ uint32_t IndentationEngine::indent_line(uint32_t row) {
     free(it);
     return 0;
   }
-  lock.unlock();
   if (len > 0 && line[len - 1] == '\n')
     --len;
   uint32_t new_indent = indent_real(line, len) + 1;
@@ -165,15 +160,14 @@ uint32_t IndentationEngine::indent_line(uint32_t row) {
     new_ws.assign(new_indent, '\t');
   else
     new_ws.assign(new_indent * indent, ' ');
-  edit_replace(editor, {row, 0}, {row, ws_len}, new_ws.c_str(),
-               new_indent * indent);
+  editor->edit_replace({row, 0}, {row, ws_len}, new_ws.c_str(),
+                       new_indent * indent);
   free(it->buffer);
   free(it);
   return (uint32_t)ABS((int64_t)ws_len - (new_indent * indent));
 }
 
 uint32_t IndentationEngine::dedent_line(uint32_t row) {
-  std::shared_lock lock(editor->knot_mtx);
   LineIterator *it = begin_l_iter(editor->root, row);
   if (!it)
     return 0;
@@ -184,7 +178,6 @@ uint32_t IndentationEngine::dedent_line(uint32_t row) {
     free(it);
     return 0;
   }
-  lock.unlock();
   if (len > 0 && line[len - 1] == '\n')
     --len;
   int64_t new_indent = (int64_t)indent_real(line, len) - 1;
@@ -198,8 +191,8 @@ uint32_t IndentationEngine::dedent_line(uint32_t row) {
     new_ws.assign(new_indent, '\t');
   else
     new_ws.assign(new_indent * indent, ' ');
-  edit_replace(editor, {row, 0}, {row, ws_len}, new_ws.c_str(),
-               new_indent * indent);
+  editor->edit_replace({row, 0}, {row, ws_len}, new_ws.c_str(),
+                       new_indent * indent);
   free(it->buffer);
   free(it);
   return (uint32_t)ABS((int64_t)ws_len - (new_indent * indent));
@@ -262,12 +255,11 @@ void IndentationEngine::indent_block(uint32_t start_row, uint32_t end_row,
     }
   }
   free(block);
-  edit_replace(editor, {start_row, 0}, {end_row, end_len}, out, out_len);
+  editor->edit_replace({start_row, 0}, {end_row, end_len}, out, out_len);
   free(out);
 }
 
 void IndentationEngine::insert_tab(Coord cursor) {
-  std::shared_lock lock(editor->knot_mtx);
   LineIterator *it = begin_l_iter(editor->root, cursor.row);
   if (!it)
     return;
@@ -278,7 +270,6 @@ void IndentationEngine::insert_tab(Coord cursor) {
     free(it);
     return;
   }
-  lock.unlock();
   if (len > 0 && line[len - 1] == '\n')
     --len;
   uint32_t ws_len = 0;
@@ -295,13 +286,12 @@ void IndentationEngine::insert_tab(Coord cursor) {
   }
   free(it->buffer);
   free(it);
-  edit_insert(editor, cursor, (char *)insert.c_str(), insert.size());
+  editor->edit_insert(cursor, (char *)insert.c_str(), insert.size());
   editor->cursor.col += insert.size();
 }
 
 void IndentationEngine::insert_new_line(Coord cursor) {
   std::string formatted;
-  std::shared_lock lock(editor->knot_mtx);
   LineIterator *it = begin_l_iter(editor->root, cursor.row);
   if (!it)
     return;
@@ -312,7 +302,6 @@ void IndentationEngine::insert_new_line(Coord cursor) {
     free(it);
     return;
   }
-  lock.unlock();
   if (len > 0 && line[len - 1] == '\n')
     --len;
   if (cursor.col >= len) {
@@ -332,7 +321,6 @@ void IndentationEngine::insert_new_line(Coord cursor) {
               cursor.row, (int64_t)indent_expected(cursor.row) - (int64_t)1);
           break;
         }
-    lock.lock();
     free(it->buffer);
     free(it);
     it = begin_l_iter(editor->root, cursor.row);
@@ -346,7 +334,6 @@ void IndentationEngine::insert_new_line(Coord cursor) {
     }
     if (len > 0 && line[len - 1] == '\n')
       --len;
-    lock.unlock();
   }
   std::string ending = trim(std::string(line + cursor.col, len - cursor.col));
   std::string before = trim(std::string(line, cursor.col));
@@ -407,15 +394,16 @@ void IndentationEngine::insert_new_line(Coord cursor) {
                            : std::string(c_indent * indent, ' ')) +
               ending;
   Coord new_cursor = {cursor.row + 1, (uint32_t)c_indent * indent};
-  edit_replace(editor, cursor, {cursor.row, len}, formatted.data(),
-               formatted.size());
+  editor->edit_replace(cursor, {cursor.row, len}, formatted.data(),
+                       formatted.size());
   editor->cursor = new_cursor;
   editor->cursor_preffered = UINT32_MAX;
   free(it->buffer);
   free(it);
-  if (!editor->lsp || !editor->lsp->allow_formatting_on_type)
+  auto lsp = editor->lsp.load();
+  if (!lsp || !lsp->allow_formatting_on_type)
     return;
-  for (char ch : editor->lsp->format_chars) {
+  for (char ch : lsp->format_chars) {
     if (ch == '\n') {
       LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
       if (!it)
@@ -431,7 +419,9 @@ void IndentationEngine::insert_new_line(Coord cursor) {
       free(it->buffer);
       free(it);
       int version = editor->lsp_version;
-      json message = {
+      auto message = std::make_unique<LSPMessage>();
+      message->editor = editor;
+      message->message = {
           {"jsonrpc", "2.0"},
           {"method", "textDocument/onTypeFormatting"},
           {"params",
@@ -443,12 +433,10 @@ void IndentationEngine::insert_new_line(Coord cursor) {
               {"insertSpaces", true},
               {"trimTrailingWhitespace", true},
               {"trimFinalNewlines", true}}}}}};
-      LSPPending *pending = new LSPPending();
-      pending->editor = editor;
-      pending->callback = [version](Editor *editor, const json &message) {
-        if (version != editor->lsp_version)
+      message->callback = [version](const LSPMessage &message) {
+        if (version != message.editor->lsp_version)
           return;
-        auto &edits = message["result"];
+        auto &edits = message.message["result"];
         if (edits.is_array()) {
           std::vector<TextEdit> t_edits;
           t_edits.reserve(edits.size());
@@ -459,14 +447,14 @@ void IndentationEngine::insert_new_line(Coord cursor) {
             t_edit.start.col = edit["range"]["start"]["character"];
             t_edit.end.row = edit["range"]["end"]["line"];
             t_edit.end.col = edit["range"]["end"]["character"];
-            utf8_normalize_edit(editor, &t_edit);
+            message.editor->utf8_normalize_edit(&t_edit);
             t_edits.push_back(t_edit);
           }
-          apply_lsp_edits(editor, t_edits, false);
-          ensure_scroll(editor);
+          message.editor->apply_lsp_edits(t_edits, false);
+          message.editor->ensure_scroll();
         }
       };
-      lsp_send(editor->lsp, message, pending);
+      lsp->send(std::move(message));
       break;
     }
   }
diff --git a/src/editor/lsp.cc b/src/editor/lsp.cc
index 357c7ac..419332b 100644
--- a/src/editor/lsp.cc
+++ b/src/editor/lsp.cc
@@ -2,52 +2,47 @@
 #include "editor/editor.h"
 #include "utils/utils.h"
 
-void apply_lsp_edits(Editor *editor, std::vector<TextEdit> edits, bool move) {
+void Editor::apply_lsp_edits(std::vector<TextEdit> edits, bool move) {
   if (!edits.size())
     return;
   TextEdit first = edits[0];
-  Coord cursor = editor->cursor;
+  Coord cursor = this->cursor;
   std::sort(
       edits.begin(), edits.end(),
       [](const TextEdit &a, const TextEdit &b) { return a.start > b.start; });
   for (const auto &edit : edits)
-    edit_replace(editor, edit.start, edit.end, edit.text.c_str(),
-                 edit.text.size());
+    this->edit_replace(edit.start, edit.end, edit.text.c_str(),
+                       edit.text.size());
   if (move) {
-    std::shared_lock lock(editor->knot_mtx);
-    editor->cursor = first.start;
-    editor->cursor =
-        move_right(editor, editor->cursor,
-                   count_clusters(first.text.c_str(), first.text.size(), 0,
-                                  first.text.size()));
+    this->cursor = first.start;
+    this->cursor = this->move_right(
+        this->cursor, count_clusters(first.text.c_str(), first.text.size(), 0,
+                                     first.text.size()));
   } else {
-    if (cursor.row >= editor->root->line_count) {
-      editor->cursor.row = editor->root->line_count - 1;
-      editor->cursor.col = 0;
+    if (cursor.row >= this->root->line_count) {
+      this->cursor.row = this->root->line_count - 1;
+      this->cursor.col = 0;
     } else {
-      std::shared_lock lock(editor->knot_mtx);
       uint32_t len;
-      line_to_byte(editor->root, cursor.row, &len);
+      line_to_byte(this->root, cursor.row, &len);
       len--;
-      editor->cursor.row = cursor.row;
-      editor->cursor.col = cursor.col < len ? cursor.col : len;
+      this->cursor.row = cursor.row;
+      this->cursor.col = cursor.col < len ? cursor.col : len;
     }
   }
 }
 
-void editor_lsp_handle(Editor *editor, json msg) {
+void Editor::lsp_handle(json msg) {
   if (msg.contains("method") &&
       msg["method"] == "textDocument/publishDiagnostics") {
-    std::unique_lock lock(editor->v_mtx);
-    editor->warnings.clear();
+    this->warnings.clear();
     json diagnostics = msg["params"]["diagnostics"];
     for (size_t i = 0; i < diagnostics.size(); i++) {
       json d = diagnostics[i];
       VWarn w;
       w.line = d["range"]["start"]["line"];
       w.start = d["range"]["start"]["character"];
-      std::shared_lock lock(editor->knot_mtx);
-      LineIterator *it = begin_l_iter(editor->root, w.line);
+      LineIterator *it = begin_l_iter(this->root, w.line);
       if (!it)
         continue;
       uint32_t len;
@@ -59,7 +54,6 @@ void editor_lsp_handle(Editor *editor, json msg) {
       }
       if (len > 0 && line[len - 1] == '\n')
         --len;
-      lock.unlock();
       w.start = utf16_offset_to_utf8(line, len, w.start);
       uint32_t end = d["range"]["end"]["character"];
       if (d["range"]["end"]["line"] == w.line)
@@ -102,9 +96,9 @@ void editor_lsp_handle(Editor *editor, json msg) {
       w.type = 1;
       if (d.contains("severity"))
         w.type = d["severity"].get<int>();
-      editor->warnings.push_back(w);
+      this->warnings.push_back(w);
     }
-    std::sort(editor->warnings.begin(), editor->warnings.end());
-    editor->warnings_dirty = true;
+    std::sort(this->warnings.begin(), this->warnings.end());
+    this->warnings_dirty = true;
   }
 }
diff --git a/src/editor/move_line.cc b/src/editor/move_line.cc
index 8cd8611..43e8033 100644
--- a/src/editor/move_line.cc
+++ b/src/editor/move_line.cc
@@ -1,120 +1,108 @@
 #include "editor/editor.h"
 #include "main.h"
 
-void move_line_up(Editor *editor) {
-  if (!editor || !editor->root || editor->cursor.row == 0)
+void Editor::move_line_up() {
+  if (!this->root || this->cursor.row == 0)
     return;
   if (mode == NORMAL || mode == INSERT) {
     uint32_t line_len, line_cluster_len;
-    std::shared_lock lock(editor->knot_mtx);
-    LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+    LineIterator *it = begin_l_iter(this->root, this->cursor.row);
     char *line = next_line(it, &line_len);
-    if (!line) {
-      lock.unlock();
+    if (!line)
       return;
-    }
     if (line_len > 0 && line[line_len - 1] == '\n')
       line_len--;
     line_cluster_len = count_clusters(line, line_len, 0, line_len);
-    uint32_t target_row = editor->cursor.row - 1;
-    uint32_t up_by = editor->cursor.row - target_row;
+    uint32_t target_row = this->cursor.row - 1;
+    uint32_t up_by = this->cursor.row - target_row;
     if (up_by > 1)
       up_by--;
-    lock.unlock();
-    Coord cursor = editor->cursor;
-    edit_erase(editor, {cursor.row, 0}, line_cluster_len);
-    edit_erase(editor, {cursor.row, 0}, -1);
-    edit_insert(editor, {cursor.row - up_by, 0}, (char *)"\n", 1);
-    edit_insert(editor, {cursor.row - up_by, 0}, line, line_len);
+    Coord cursor = this->cursor;
+    edit_erase({cursor.row, 0}, line_cluster_len);
+    edit_erase({cursor.row, 0}, -1);
+    edit_insert({cursor.row - up_by, 0}, (char *)"\n", 1);
+    edit_insert({cursor.row - up_by, 0}, line, line_len);
     free(it->buffer);
     free(it);
-    editor->cursor = {cursor.row - up_by, cursor.col};
+    this->cursor = {cursor.row - up_by, cursor.col};
   } else if (mode == SELECT) {
-    uint32_t start_row = MIN(editor->cursor.row, editor->selection.row);
-    uint32_t end_row = MAX(editor->cursor.row, editor->selection.row);
-    uint32_t start_byte = line_to_byte(editor->root, start_row, nullptr);
-    uint32_t end_byte = line_to_byte(editor->root, end_row + 1, nullptr);
-    char *selected_text = read(editor->root, start_byte, end_byte - start_byte);
+    uint32_t start_row = MIN(this->cursor.row, this->selection.row);
+    uint32_t end_row = MAX(this->cursor.row, this->selection.row);
+    uint32_t start_byte = line_to_byte(this->root, start_row, nullptr);
+    uint32_t end_byte = line_to_byte(this->root, end_row + 1, nullptr);
+    char *selected_text = read(this->root, start_byte, end_byte - start_byte);
     if (!selected_text)
       return;
     uint32_t selected_len = count_clusters(selected_text, end_byte - start_byte,
                                            0, end_byte - start_byte);
-    Coord cursor = editor->cursor;
-    Coord selection = editor->selection;
-    edit_erase(editor, {start_row, 0}, selected_len);
-    edit_insert(editor, {start_row - 1, 0}, selected_text,
-                end_byte - start_byte);
+    Coord cursor = this->cursor;
+    Coord selection = this->selection;
+    edit_erase({start_row, 0}, selected_len);
+    edit_insert({start_row - 1, 0}, selected_text, end_byte - start_byte);
     free(selected_text);
-    editor->cursor = {cursor.row - 1, cursor.col};
-    editor->selection = {selection.row - 1, selection.col};
+    this->cursor = {cursor.row - 1, cursor.col};
+    this->selection = {selection.row - 1, selection.col};
   }
 }
 
-void move_line_down(Editor *editor) {
-  if (!editor || !editor->root)
+void Editor::move_line_down() {
+  if (!this->root)
     return;
   if (mode == NORMAL || mode == INSERT) {
-    if (editor->cursor.row >= editor->root->line_count - 1)
+    if (this->cursor.row >= this->root->line_count - 1)
       return;
     uint32_t line_len, line_cluster_len;
-    std::shared_lock lock(editor->knot_mtx);
-    LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+    LineIterator *it = begin_l_iter(this->root, this->cursor.row);
     char *line = next_line(it, &line_len);
-    if (!line) {
-      lock.unlock();
+    if (!line)
       return;
-    }
     if (line_len && line[line_len - 1] == '\n')
       line_len--;
     line_cluster_len = count_clusters(line, line_len, 0, line_len);
-    uint32_t target_row = editor->cursor.row + 1;
-    if (target_row >= editor->root->line_count) {
-      free(line);
-      lock.unlock();
+    uint32_t target_row = this->cursor.row + 1;
+    if (target_row >= this->root->line_count) {
+      free(it->buffer);
+      free(it);
       return;
     }
-    uint32_t down_by = target_row - editor->cursor.row;
+    uint32_t down_by = target_row - this->cursor.row;
     if (down_by > 1)
       down_by--;
     uint32_t ln;
-    line_to_byte(editor->root, editor->cursor.row + down_by - 1, &ln);
-    lock.unlock();
-    Coord cursor = editor->cursor;
-    edit_erase(editor, {cursor.row, 0}, line_cluster_len);
-    edit_erase(editor, {cursor.row, 0}, -1);
-    edit_insert(editor, {cursor.row + down_by, 0}, (char *)"\n", 1);
-    edit_insert(editor, {cursor.row + down_by, 0}, line, line_len);
+    line_to_byte(this->root, this->cursor.row + down_by - 1, &ln);
+    Coord cursor = this->cursor;
+    edit_erase({cursor.row, 0}, line_cluster_len);
+    edit_erase({cursor.row, 0}, -1);
+    edit_insert({cursor.row + down_by, 0}, (char *)"\n", 1);
+    edit_insert({cursor.row + down_by, 0}, line, line_len);
     free(it->buffer);
     free(it);
-    editor->cursor = {cursor.row + down_by, cursor.col};
+    this->cursor = {cursor.row + down_by, cursor.col};
   } else if (mode == SELECT) {
-    if (editor->cursor.row >= editor->root->line_count - 1 ||
-        editor->selection.row >= editor->root->line_count - 1)
+    if (this->cursor.row >= this->root->line_count - 1 ||
+        this->selection.row >= this->root->line_count - 1)
       return;
-    std::shared_lock lock(editor->knot_mtx);
-    uint32_t start_row = MIN(editor->cursor.row, editor->selection.row);
-    uint32_t end_row = MAX(editor->cursor.row, editor->selection.row);
+    uint32_t start_row = MIN(this->cursor.row, this->selection.row);
+    uint32_t end_row = MAX(this->cursor.row, this->selection.row);
     uint32_t target_row = end_row + 1;
-    if (target_row >= editor->root->line_count)
+    if (target_row >= this->root->line_count)
       return;
     uint32_t down_by = target_row - end_row;
     if (down_by > 1)
       down_by--;
-    uint32_t start_byte = line_to_byte(editor->root, start_row, nullptr);
-    uint32_t end_byte = line_to_byte(editor->root, end_row + 1, nullptr);
-    char *selected_text = read(editor->root, start_byte, end_byte - start_byte);
-    lock.unlock();
+    uint32_t start_byte = line_to_byte(this->root, start_row, nullptr);
+    uint32_t end_byte = line_to_byte(this->root, end_row + 1, nullptr);
+    char *selected_text = read(this->root, start_byte, end_byte - start_byte);
     if (!selected_text)
       return;
     uint32_t selected_len = count_clusters(selected_text, end_byte - start_byte,
                                            0, end_byte - start_byte);
-    Coord cursor = editor->cursor;
-    Coord selection = editor->selection;
-    edit_erase(editor, {start_row, 0}, selected_len);
-    edit_insert(editor, {start_row + down_by, 0}, selected_text,
-                end_byte - start_byte);
+    Coord cursor = this->cursor;
+    Coord selection = this->selection;
+    edit_erase({start_row, 0}, selected_len);
+    edit_insert({start_row + down_by, 0}, selected_text, end_byte - start_byte);
     free(selected_text);
-    editor->cursor = {cursor.row + down_by, cursor.col};
-    editor->selection = {selection.row + down_by, selection.col};
+    this->cursor = {cursor.row + down_by, cursor.col};
+    this->selection = {selection.row + down_by, selection.col};
   }
 }
diff --git a/src/editor/renderer.cc b/src/editor/renderer.cc
index 3523d8a..6d18d5d 100644
--- a/src/editor/renderer.cc
+++ b/src/editor/renderer.cc
@@ -3,27 +3,24 @@
 #include "main.h"
 #include "syntax/decl.h"
 #include "syntax/parser.h"
-#include <cstdint>
 
-void render_editor(Editor *editor) {
+void Editor::render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) {
+  this->size = size;
   uint32_t sel_start = 0, sel_end = 0;
-  std::shared_lock knot_lock(editor->knot_mtx);
   uint32_t numlen =
-      EXTRA_META + static_cast<int>(std::log10(editor->root->line_count + 1));
-  uint32_t render_width = editor->size.col - numlen;
-  uint32_t render_x = editor->position.col + numlen + 1;
+      EXTRA_META + static_cast<int>(std::log10(this->root->line_count + 1));
+  uint32_t render_width = size.col - numlen;
+  uint32_t render_x = pos.col + numlen + 1;
   std::vector<std::pair<uint32_t, char>> v;
   for (size_t i = 0; i < 94; ++i)
-    if (editor->hooks[i] != 0)
-      v.push_back({editor->hooks[i], '!' + i});
+    if (this->hooks[i] != 0)
+      v.push_back({this->hooks[i], '!' + i});
   std::sort(v.begin(), v.end());
   auto hook_it = v.begin();
-  while (hook_it != v.end() && hook_it->first <= editor->scroll.row)
+  while (hook_it != v.end() && hook_it->first <= this->scroll.row)
     ++hook_it;
-  std::unique_lock warn_lock(editor->v_mtx);
-  auto warn_it = editor->warnings.begin();
-  while (warn_it != editor->warnings.end() &&
-         warn_it->line < editor->scroll.row)
+  auto warn_it = this->warnings.begin();
+  while (warn_it != this->warnings.end() && warn_it->line < this->scroll.row)
     ++warn_it;
   LineData *line_data = nullptr;
   auto get_type = [&](uint32_t col) {
@@ -34,40 +31,54 @@ void render_editor(Editor *editor) {
         return (int)token.type;
     return 0;
   };
-  if (editor->selection_active) {
+  Coord screen = get_size();
+  auto update = [&](uint32_t row, uint32_t col, std::string text, uint32_t fg,
+                    uint32_t bg, uint8_t flags, uint32_t u_color,
+                    uint32_t width) {
+    if (row >= screen.row || col >= screen.col)
+      return;
+    ScreenCell &c = buffer[row * screen.col + col];
+    c.utf8 = text;
+    c.width = width;
+    c.fg = fg;
+    c.bg = bg;
+    c.flags = flags;
+    c.ul_color = u_color;
+  };
+  if (this->selection_active) {
     Coord start, end;
-    if (editor->cursor >= editor->selection) {
+    if (this->cursor >= this->selection) {
       uint32_t prev_col, next_col;
-      switch (editor->selection_type) {
+      switch (this->selection_type) {
       case CHAR:
-        start = editor->selection;
-        end = move_right(editor, editor->cursor, 1);
+        start = this->selection;
+        end = this->move_right(this->cursor, 1);
         break;
       case WORD:
-        word_boundaries(editor, editor->selection, &prev_col, &next_col,
-                        nullptr, nullptr);
-        start = {editor->selection.row, prev_col};
-        end = editor->cursor;
+        this->word_boundaries(this->selection, &prev_col, &next_col, nullptr,
+                              nullptr);
+        start = {this->selection.row, prev_col};
+        end = this->cursor;
         break;
       case LINE:
-        start = {editor->selection.row, 0};
-        end = editor->cursor;
+        start = {this->selection.row, 0};
+        end = this->cursor;
         break;
       }
     } else {
-      start = editor->cursor;
+      start = this->cursor;
       uint32_t prev_col, next_col, line_len;
-      switch (editor->selection_type) {
+      switch (this->selection_type) {
       case CHAR:
-        end = move_right(editor, editor->selection, 1);
+        end = this->move_right(this->selection, 1);
         break;
       case WORD:
-        word_boundaries(editor, editor->selection, &prev_col, &next_col,
-                        nullptr, nullptr);
-        end = {editor->selection.row, next_col};
+        this->word_boundaries(this->selection, &prev_col, &next_col, nullptr,
+                              nullptr);
+        end = {this->selection.row, next_col};
         break;
       case LINE:
-        LineIterator *it = begin_l_iter(editor->root, editor->selection.row);
+        LineIterator *it = begin_l_iter(this->root, this->selection.row);
         char *line = next_line(it, &line_len);
         if (!line)
           return;
@@ -75,40 +86,40 @@ void render_editor(Editor *editor) {
           line_len--;
         free(it->buffer);
         free(it);
-        end = {editor->selection.row, line_len};
+        end = {this->selection.row, line_len};
         break;
       }
     }
-    sel_start = line_to_byte(editor->root, start.row, nullptr) + start.col;
-    sel_end = line_to_byte(editor->root, end.row, nullptr) + end.col;
+    sel_start = line_to_byte(this->root, start.row, nullptr) + start.col;
+    sel_end = line_to_byte(this->root, end.row, nullptr) + end.col;
   }
   Coord cursor = {UINT32_MAX, UINT32_MAX};
-  uint32_t line_index = editor->scroll.row;
-  LineIterator *it = begin_l_iter(editor->root, line_index);
+  uint32_t line_index = this->scroll.row;
+  LineIterator *it = begin_l_iter(this->root, line_index);
   if (!it)
     return;
   uint32_t prev_col, next_col;
   std::string word;
-  word_boundaries_exclusive(editor, editor->cursor, &prev_col, &next_col);
+  this->word_boundaries_exclusive(this->cursor, &prev_col, &next_col);
   if (next_col - prev_col > 0 && next_col - prev_col < 256 - 4) {
-    uint32_t offset = line_to_byte(editor->root, editor->cursor.row, nullptr);
-    char *word_ptr = read(editor->root, offset + prev_col, next_col - prev_col);
+    uint32_t offset = line_to_byte(this->root, this->cursor.row, nullptr);
+    char *word_ptr = read(this->root, offset + prev_col, next_col - prev_col);
     if (word_ptr) {
       word = std::string(word_ptr, next_col - prev_col);
       free(word_ptr);
     }
   }
-  editor->extra_hl.render(editor->root, line_index, word, editor->is_css_color);
+  this->extra_hl.render(this->root, line_index, word, this->is_css_color);
   uint32_t rendered_rows = 0;
-  uint32_t global_byte_offset = line_to_byte(editor->root, line_index, nullptr);
-  while (rendered_rows < editor->size.row) {
+  uint32_t global_byte_offset = line_to_byte(this->root, line_index, nullptr);
+  while (rendered_rows < this->size.row) {
     uint32_t line_len;
     char *line = next_line(it, &line_len);
-    if (editor->parser) {
+    if (this->parser) {
       if (line_data)
-        line_data = editor->parser->line_tree.next();
+        line_data = this->parser->line_tree.next();
       else
-        line_data = editor->parser->line_tree.start_iter(line_index);
+        line_data = this->parser->line_tree.start_iter(line_index);
     }
     if (!line)
       break;
@@ -123,54 +134,51 @@ void render_editor(Editor *editor) {
            (line[content_start] == ' ' || line[content_start] == '\t'))
       content_start++;
     std::vector<VWarn> line_warnings;
-    while (warn_it != editor->warnings.end() && warn_it->line == line_index) {
+    while (warn_it != this->warnings.end() && warn_it->line == line_index) {
       line_warnings.push_back(*warn_it);
       ++warn_it;
     }
     uint32_t current_byte_offset = 0;
     if (rendered_rows == 0)
-      current_byte_offset += editor->scroll.col;
-    while (current_byte_offset < line_len && rendered_rows < editor->size.row) {
-      uint32_t color = editor->cursor.row == line_index ? 0x222222 : 0;
+      current_byte_offset += this->scroll.col;
+    while (current_byte_offset < line_len && rendered_rows < this->size.row) {
+      uint32_t color = this->cursor.row == line_index ? 0x222222 : 0;
       if (current_byte_offset == 0 || rendered_rows == 0) {
-        const char *hook = nullptr;
+        const char *hook = "";
         char h[2] = {0, 0};
         if (hook_it != v.end() && hook_it->first == line_index + 1) {
           h[0] = hook_it->second;
           hook = h;
           hook_it++;
         }
-        update(editor->position.row + rendered_rows, editor->position.col, hook,
-               0xAAAAAA, 0, 0);
+        update(pos.row + rendered_rows, pos.col, hook, 0xAAAAAA, 0, 0, 0, 1);
         char buf[16];
         int len = snprintf(buf, sizeof(buf), "%*u ", numlen, line_index + 1);
         uint32_t num_color =
-            editor->cursor.row == line_index ? 0xFFFFFF : 0x555555;
+            this->cursor.row == line_index ? 0xFFFFFF : 0x555555;
         for (int i = 0; i < len; i++)
-          update(editor->position.row + rendered_rows, editor->position.col + i,
-                 (char[2]){buf[i], 0}, num_color, 0, 0);
+          update(pos.row + rendered_rows, pos.col + i, (char[2]){buf[i], 0},
+                 num_color, 0, 0, 0, 1);
       } else {
         for (uint32_t i = 0; i < numlen + 1; i++)
-          update(editor->position.row + rendered_rows, editor->position.col + i,
-                 " ", 0, 0, 0);
+          update(pos.row + rendered_rows, pos.col + i, " ", 0, 0, 0, 0, 1);
       }
       uint32_t col = 0;
       uint32_t local_render_offset = 0;
       uint32_t line_left = line_len - current_byte_offset;
       while (line_left > 0 && col < render_width) {
-        if (line_index == editor->cursor.row &&
-            editor->cursor.col == (current_byte_offset + local_render_offset)) {
-          cursor.row = editor->position.row + rendered_rows;
+        if (line_index == this->cursor.row &&
+            this->cursor.col == (current_byte_offset + local_render_offset)) {
+          cursor.row = pos.row + rendered_rows;
           cursor.col = render_x + col;
         }
         uint32_t absolute_byte_pos =
             global_byte_offset + current_byte_offset + local_render_offset;
         const Highlight *hl = nullptr;
-        if (editor->parser)
+        if (this->parser)
           hl = &highlights[get_type(current_byte_offset + local_render_offset)];
-        std::optional<std::pair<uint32_t, uint32_t>> extra =
-            editor->extra_hl.get(
-                {line_index, current_byte_offset + local_render_offset});
+        std::optional<std::pair<uint32_t, uint32_t>> extra = this->extra_hl.get(
+            {line_index, current_byte_offset + local_render_offset});
         uint32_t fg = extra && extra->second != UINT32_MAX
                           ? extra->first
                           : (hl ? hl->fg : 0xFFFFFF);
@@ -181,7 +189,7 @@ void render_editor(Editor *editor) {
             (hl ? hl->flags : 0) |
             (extra ? (extra->second != UINT32_MAX ? CF_BOLD : CF_UNDERLINE)
                    : 0);
-        if (editor->selection_active && absolute_byte_pos >= sel_start &&
+        if (this->selection_active && absolute_byte_pos >= sel_start &&
             absolute_byte_pos < sel_end)
           bg = bg | 0x555555;
         uint32_t u_color = 0;
@@ -217,40 +225,39 @@ void render_editor(Editor *editor) {
           break;
         if (current_byte_offset + local_render_offset >= content_start &&
             current_byte_offset + local_render_offset < content_end) {
-          update(editor->position.row + rendered_rows, render_x + col,
-                 cluster.c_str(), fg, bg | color, fl, u_color);
+          update(pos.row + rendered_rows, render_x + col, cluster.c_str(), fg,
+                 bg | color, fl, u_color, width);
         } else {
           if (cluster[0] == ' ') {
-            update(editor->position.row + rendered_rows, render_x + col, "·",
-                   0x282828, bg | color, fl, u_color);
+            update(pos.row + rendered_rows, render_x + col, "·", 0x282828,
+                   bg | color, fl, u_color, 1);
           } else {
-            update(editor->position.row + rendered_rows, render_x + col, "->  ",
-                   0x282828, bg | color, (fl & ~CF_BOLD) | CF_ITALIC, u_color);
+            update(pos.row + rendered_rows, render_x + col, "->  ", 0x282828,
+                   bg | color, (fl & ~CF_BOLD) | CF_ITALIC, u_color, 4);
           }
         }
         local_render_offset += cluster_len;
         line_left -= cluster_len;
         col += width;
         while (width-- > 1)
-          update(editor->position.row + rendered_rows, render_x + col - width,
-                 "\x1b", fg, bg | color, fl);
+          update(pos.row + rendered_rows, render_x + col - width, "\x1b", fg,
+                 bg | color, fl, u_color, 0);
       }
-      if (line_index == editor->cursor.row &&
-          editor->cursor.col == (current_byte_offset + local_render_offset)) {
-        cursor.row = editor->position.row + rendered_rows;
+      if (line_index == this->cursor.row &&
+          this->cursor.col == (current_byte_offset + local_render_offset)) {
+        cursor.row = pos.row + rendered_rows;
         cursor.col = render_x + col;
       }
-      if (editor->selection_active &&
+      if (this->selection_active &&
           global_byte_offset + line_len + 1 > sel_start &&
           global_byte_offset + line_len + 1 <= sel_end && col < render_width) {
-        update(editor->position.row + rendered_rows, render_x + col, " ", 0,
-               0x555555 | color, 0);
+        update(pos.row + rendered_rows, render_x + col, " ", 0,
+               0x555555 | color, 0, 0, 1);
         col++;
       }
       if (!line_warnings.empty() && line_left == 0) {
         VWarn warn = line_warnings.front();
-        update(editor->position.row + rendered_rows, render_x + col, " ", 0,
-               color, 0);
+        update(pos.row + rendered_rows, render_x + col, " ", 0, color, 0, 0, 1);
         col++;
         for (size_t i = 0; i < line_warnings.size(); i++) {
           if (line_warnings[i].type < warn.type)
@@ -276,18 +283,18 @@ void render_editor(Editor *editor) {
             goto final;
           final:
             if (col < render_width) {
-              update(editor->position.row + rendered_rows, render_x + col,
-                     err_sym, fg_color, color, 0);
+              update(pos.row + rendered_rows, render_x + col, err_sym, fg_color,
+                     color, 0, 0, 1);
               col++;
-              update(editor->position.row + rendered_rows, render_x + col, " ",
-                     fg_color, color, 0);
+              update(pos.row + rendered_rows, render_x + col, " ", fg_color,
+                     color, 0, 0, 1);
               col++;
             }
           }
         }
         if (col < render_width) {
-          update(editor->position.row + rendered_rows, render_x + col, " ", 0,
-                 0 | color, 0);
+          update(pos.row + rendered_rows, render_x + col, " ", 0, 0 | color, 0,
+                 0, 1);
           col++;
         }
         size_t warn_idx = 0;
@@ -313,19 +320,19 @@ void render_editor(Editor *editor) {
           int width = display_width(cluster.c_str(), cluster_len);
           if (col + width > render_width)
             break;
-          update(editor->position.row + rendered_rows, render_x + col,
-                 cluster.c_str(), fg_color, color, 0);
+          update(pos.row + rendered_rows, render_x + col, cluster.c_str(),
+                 fg_color, color, 0, 0, width);
           col += width;
           warn_idx += cluster_len;
           while (width-- > 1)
-            update(editor->position.row + rendered_rows, render_x + col - width,
-                   "\x1b", fg_color, color, 0);
+            update(pos.row + rendered_rows, render_x + col - width, "\x1b",
+                   fg_color, color, 0, 0, 0);
         }
         line_warnings.clear();
       }
       while (col < render_width) {
-        update(editor->position.row + rendered_rows, render_x + col, " ", 0,
-               0 | color, 0);
+        update(pos.row + rendered_rows, render_x + col, " ", 0, 0 | color, 0, 0,
+               1);
         col++;
       }
       rendered_rows++;
@@ -333,39 +340,36 @@ void render_editor(Editor *editor) {
     }
     if (line_len == 0 ||
         (current_byte_offset >= line_len && rendered_rows == 0)) {
-      uint32_t color = editor->cursor.row == line_index ? 0x222222 : 0;
-      const char *hook = nullptr;
+      uint32_t color = this->cursor.row == line_index ? 0x222222 : 0;
+      const char *hook = "";
       char h[2] = {0, 0};
       if (hook_it != v.end() && hook_it->first == line_index + 1) {
         h[0] = hook_it->second;
         hook = h;
         hook_it++;
       }
-      update(editor->position.row + rendered_rows, editor->position.col, hook,
-             0xAAAAAA, 0, 0);
+      update(pos.row + rendered_rows, pos.col, hook, 0xAAAAAA, 0, 0, 0, 1);
       char buf[16];
       int len = snprintf(buf, sizeof(buf), "%*u ", numlen, line_index + 1);
-      uint32_t num_color =
-          editor->cursor.row == line_index ? 0xFFFFFF : 0x555555;
+      uint32_t num_color = this->cursor.row == line_index ? 0xFFFFFF : 0x555555;
       for (int i = 0; i < len; i++)
-        update(editor->position.row + rendered_rows, editor->position.col + i,
-               (char[2]){buf[i], 0}, num_color, 0, 0);
-      if (editor->cursor.row == line_index) {
-        cursor.row = editor->position.row + rendered_rows;
+        update(pos.row + rendered_rows, pos.col + i, (char[2]){buf[i], 0},
+               num_color, 0, 0, 0, 1);
+      if (this->cursor.row == line_index) {
+        cursor.row = pos.row + rendered_rows;
         cursor.col = render_x;
       }
       uint32_t col = 0;
-      if (editor->selection_active &&
+      if (this->selection_active &&
           global_byte_offset + line_len + 1 > sel_start &&
           global_byte_offset + line_len + 1 <= sel_end) {
-        update(editor->position.row + rendered_rows, render_x + col, " ", 0,
-               0x555555 | color, 0);
+        update(pos.row + rendered_rows, render_x + col, " ", 0,
+               0x555555 | color, 0, 0, 1);
         col++;
       }
       if (!line_warnings.empty()) {
         VWarn warn = line_warnings.front();
-        update(editor->position.row + rendered_rows, render_x + col, " ", 0,
-               color, 0);
+        update(pos.row + rendered_rows, render_x + col, " ", 0, color, 0, 0, 1);
         col++;
         for (size_t i = 0; i < line_warnings.size(); i++) {
           if (line_warnings[i].type < warn.type)
@@ -391,18 +395,18 @@ void render_editor(Editor *editor) {
             goto final2;
           final2:
             if (col < render_width) {
-              update(editor->position.row + rendered_rows, render_x + col,
-                     err_sym, fg_color, color, 0);
+              update(pos.row + rendered_rows, render_x + col, err_sym, fg_color,
+                     color, 0, 0, 1);
               col++;
-              update(editor->position.row + rendered_rows, render_x + col, " ",
-                     fg_color, color, 0);
+              update(pos.row + rendered_rows, render_x + col, " ", fg_color,
+                     color, 0, 0, 1);
               col++;
             }
           }
         }
         if (col < render_width) {
-          update(editor->position.row + rendered_rows, render_x + col, " ", 0,
-                 0 | color, 0);
+          update(pos.row + rendered_rows, render_x + col, " ", 0, 0 | color, 0,
+                 0, 1);
           col++;
         }
         size_t warn_idx = 0;
@@ -428,18 +432,18 @@ void render_editor(Editor *editor) {
           int width = display_width(cluster.c_str(), cluster_len);
           if (col + width > render_width)
             break;
-          update(editor->position.row + rendered_rows, render_x + col,
-                 cluster.c_str(), fg_color, color, 0);
+          update(pos.row + rendered_rows, render_x + col, cluster.c_str(),
+                 fg_color, color, 0, 0, width);
           col += width;
           warn_idx += cluster_len;
           while (width-- > 1)
-            update(editor->position.row + rendered_rows, render_x + col - width,
-                   "\x1b", fg_color, color, 0);
+            update(pos.row + rendered_rows, render_x + col - width, "\x1b",
+                   fg_color, color, 0, 0, 0);
         }
       }
       while (col < render_width) {
-        update(editor->position.row + rendered_rows, render_x + col, " ", 0,
-               0 | color, 0);
+        update(pos.row + rendered_rows, render_x + col, " ", 0, 0 | color, 0, 0,
+               1);
         col++;
       }
       rendered_rows++;
@@ -447,10 +451,9 @@ void render_editor(Editor *editor) {
     global_byte_offset += line_len + 1;
     line_index++;
   }
-  while (rendered_rows < editor->size.row) {
-    for (uint32_t col = 0; col < editor->size.col; col++)
-      update(editor->position.row + rendered_rows, editor->position.col + col,
-             " ", 0xFFFFFF, 0, 0);
+  while (rendered_rows < this->size.row) {
+    for (uint32_t col = 0; col < this->size.col; col++)
+      update(pos.row + rendered_rows, pos.col + col, " ", 0xFFFFFF, 0, 0, 0, 1);
     rendered_rows++;
   }
   if (cursor.row != UINT32_MAX && cursor.col != UINT32_MAX) {
@@ -468,15 +471,17 @@ void render_editor(Editor *editor) {
       break;
     }
     set_cursor(cursor.row, cursor.col, type, true);
-    if (editor->completion.active && !editor->completion.box.hidden)
-      editor->completion.box.render(cursor);
-    else if (editor->hover_active)
-      editor->hover.render(cursor);
-    else if (editor->diagnostics_active)
-      editor->diagnostics.render(cursor);
+    // if (this->completion.active && !this->completion.box.hidden)
+    //   this->completion.box.render(cursor);
+    // else if (this->hover_active)
+    //   this->hover.render(cursor);
+    // else if (this->diagnostics_active)
+    //   this->diagnostics.render(cursor);
+    if (this->hover_active)
+      ui::hover_popup->pos = cursor;
   }
   free(it->buffer);
   free(it);
-  if (editor->parser)
-    editor->parser->scroll(line_index + 5);
+  if (this->parser)
+    this->parser->scroll(line_index + 5);
 }
diff --git a/src/editor/scroll.cc b/src/editor/scroll.cc
index cf68698..2fd1aee 100644
--- a/src/editor/scroll.cc
+++ b/src/editor/scroll.cc
@@ -1,13 +1,13 @@
 #include "editor/editor.h"
 
-void scroll_up(Editor *editor, int32_t number) {
-  if (!editor || number == 0)
+void Editor::scroll_up(uint32_t number) {
+  if (number == 0)
     return;
   uint32_t numlen =
-      EXTRA_META + static_cast<int>(std::log10(editor->root->line_count + 1));
-  uint32_t render_width = editor->size.col - numlen;
-  uint32_t line_index = editor->scroll.row;
-  LineIterator *it = begin_l_iter(editor->root, line_index);
+      EXTRA_META + static_cast<int>(std::log10(this->root->line_count + 1));
+  uint32_t render_width = this->size.col - numlen;
+  uint32_t line_index = this->scroll.row;
+  LineIterator *it = begin_l_iter(this->root, line_index);
   if (!it)
     return;
   uint32_t len;
@@ -23,10 +23,9 @@ void scroll_up(Editor *editor, int32_t number) {
   uint32_t col = 0;
   std::vector<uint32_t> segment_starts;
   segment_starts.reserve(16);
-  if (current_byte_offset < editor->scroll.col)
+  if (current_byte_offset < this->scroll.col)
     segment_starts.push_back(0);
-  while (current_byte_offset < editor->scroll.col &&
-         current_byte_offset < len) {
+  while (current_byte_offset < this->scroll.col && current_byte_offset < len) {
     uint32_t cluster_len = grapheme_next_character_break_utf8(
         line + current_byte_offset, len - current_byte_offset);
     int width = display_width(line + current_byte_offset, cluster_len);
@@ -40,7 +39,7 @@ void scroll_up(Editor *editor, int32_t number) {
   for (auto it_seg = segment_starts.rbegin(); it_seg != segment_starts.rend();
        ++it_seg) {
     if (--number == 0) {
-      editor->scroll = {line_index, *it_seg};
+      this->scroll = {line_index, *it_seg};
       free(it->buffer);
       free(it);
       return;
@@ -48,7 +47,7 @@ void scroll_up(Editor *editor, int32_t number) {
   }
   line = prev_line(it, &len);
   if (!line) {
-    editor->scroll = {0, 0};
+    this->scroll = {0, 0};
     free(it->buffer);
     free(it);
     return;
@@ -57,7 +56,7 @@ void scroll_up(Editor *editor, int32_t number) {
     line_index--;
     line = prev_line(it, &len);
     if (!line) {
-      editor->scroll = {0, 0};
+      this->scroll = {0, 0};
       free(it->buffer);
       free(it);
       return;
@@ -83,7 +82,7 @@ void scroll_up(Editor *editor, int32_t number) {
     for (auto it_seg = segment_starts.rbegin(); it_seg != segment_starts.rend();
          ++it_seg) {
       if (--number == 0) {
-        editor->scroll = {line_index, *it_seg};
+        this->scroll = {line_index, *it_seg};
         free(it->buffer);
         free(it);
         return;
@@ -94,17 +93,17 @@ void scroll_up(Editor *editor, int32_t number) {
   free(it);
 }
 
-void scroll_down(Editor *editor, uint32_t number) {
-  if (!editor || number == 0)
+void Editor::scroll_down(uint32_t number) {
+  if (number == 0)
     return;
   uint32_t numlen =
-      EXTRA_META + static_cast<int>(std::log10(editor->root->line_count + 1));
-  uint32_t render_width = editor->size.col - numlen;
-  uint32_t line_index = editor->scroll.row;
-  LineIterator *it = begin_l_iter(editor->root, line_index);
+      EXTRA_META + static_cast<int>(std::log10(this->root->line_count + 1));
+  uint32_t render_width = this->size.col - numlen;
+  uint32_t line_index = this->scroll.row;
+  LineIterator *it = begin_l_iter(this->root, line_index);
   if (!it)
     return;
-  const uint32_t max_visual_lines = editor->size.row;
+  const uint32_t max_visual_lines = this->size.row;
   Coord *scroll_queue = (Coord *)malloc(sizeof(Coord) * max_visual_lines);
   uint32_t q_head = 0;
   uint32_t q_size = 0;
@@ -119,7 +118,7 @@ void scroll_down(Editor *editor, uint32_t number) {
       line_len--;
     uint32_t current_byte_offset = 0;
     if (first_visual_line) {
-      current_byte_offset += editor->scroll.col;
+      current_byte_offset += this->scroll.col;
       first_visual_line = false;
     }
     while (current_byte_offset < line_len ||
@@ -134,7 +133,7 @@ void scroll_down(Editor *editor, uint32_t number) {
       }
       visual_seen++;
       if (visual_seen >= number + max_visual_lines) {
-        editor->scroll = scroll_queue[q_head];
+        this->scroll = scroll_queue[q_head];
         free(scroll_queue);
         free(it->buffer);
         free(it);
@@ -162,7 +161,7 @@ void scroll_down(Editor *editor, uint32_t number) {
   }
   if (q_size > 0) {
     uint32_t advance = (q_size > number) ? number : (q_size - 1);
-    editor->scroll = scroll_queue[(q_head + advance) % max_visual_lines];
+    this->scroll = scroll_queue[(q_head + advance) % max_visual_lines];
   }
   free(it->buffer);
   free(it);
diff --git a/src/editor/selection.cc b/src/editor/selection.cc
index 609663c..2e3b374 100644
--- a/src/editor/selection.cc
+++ b/src/editor/selection.cc
@@ -1,47 +1,46 @@
 #include "editor/editor.h"
 #include "utils/utils.h"
 
-void selection_bounds(Editor *editor, Coord *out_start, Coord *out_end) {
-  std::shared_lock lock(editor->knot_mtx);
+void Editor::selection_bounds(Coord *out_start, Coord *out_end) {
   Coord start, end;
-  if (editor->cursor >= editor->selection) {
+  if (this->cursor >= this->selection) {
     uint32_t prev_col;
-    switch (editor->selection_type) {
+    switch (this->selection_type) {
     case CHAR:
-      start = editor->selection;
-      end = move_right(editor, editor->cursor, 1);
+      start = this->selection;
+      end = this->move_right(this->cursor, 1);
       break;
     case WORD:
-      word_boundaries(editor, editor->selection, &prev_col, nullptr, nullptr,
-                      nullptr);
-      start = {editor->selection.row, prev_col};
-      end = editor->cursor;
+      this->word_boundaries(this->selection, &prev_col, nullptr, nullptr,
+                            nullptr);
+      start = {this->selection.row, prev_col};
+      end = this->cursor;
       break;
     case LINE:
-      start = {editor->selection.row, 0};
-      end = editor->cursor;
+      start = {this->selection.row, 0};
+      end = this->cursor;
       break;
     }
   } else {
-    start = editor->cursor;
+    start = this->cursor;
     uint32_t next_col, line_len;
-    switch (editor->selection_type) {
+    switch (this->selection_type) {
     case CHAR:
-      end = move_right(editor, editor->selection, 1);
+      end = this->move_right(this->selection, 1);
       break;
     case WORD:
-      word_boundaries(editor, editor->selection, nullptr, &next_col, nullptr,
-                      nullptr);
-      end = {editor->selection.row, next_col};
+      this->word_boundaries(this->selection, nullptr, &next_col, nullptr,
+                            nullptr);
+      end = {this->selection.row, next_col};
       break;
     case LINE:
-      LineIterator *it = begin_l_iter(editor->root, editor->selection.row);
+      LineIterator *it = begin_l_iter(this->root, this->selection.row);
       char *line = next_line(it, &line_len);
       if (!line)
         return;
       if (line_len > 0 && line[line_len - 1] == '\n')
         line_len--;
-      end = {editor->selection.row, line_len};
+      end = {this->selection.row, line_len};
       free(it->buffer);
       free(it);
       break;
@@ -53,47 +52,46 @@ void selection_bounds(Editor *editor, Coord *out_start, Coord *out_end) {
     *out_end = end;
 }
 
-char *get_selection(Editor *editor, uint32_t *out_len, Coord *out_start) {
-  std::shared_lock lock(editor->knot_mtx);
+char *Editor::get_selection(uint32_t *out_len, Coord *out_start) {
   Coord start, end;
-  if (editor->cursor >= editor->selection) {
+  if (this->cursor >= this->selection) {
     uint32_t prev_col;
-    switch (editor->selection_type) {
+    switch (this->selection_type) {
     case CHAR:
-      start = editor->selection;
-      end = move_right(editor, editor->cursor, 1);
+      start = this->selection;
+      end = this->move_right(this->cursor, 1);
       break;
     case WORD:
-      word_boundaries(editor, editor->selection, &prev_col, nullptr, nullptr,
-                      nullptr);
-      start = {editor->selection.row, prev_col};
-      end = editor->cursor;
+      this->word_boundaries(this->selection, &prev_col, nullptr, nullptr,
+                            nullptr);
+      start = {this->selection.row, prev_col};
+      end = this->cursor;
       break;
     case LINE:
-      start = {editor->selection.row, 0};
-      end = editor->cursor;
+      start = {this->selection.row, 0};
+      end = this->cursor;
       break;
     }
   } else {
-    start = editor->cursor;
+    start = this->cursor;
     uint32_t next_col, line_len;
-    switch (editor->selection_type) {
+    switch (this->selection_type) {
     case CHAR:
-      end = move_right(editor, editor->selection, 1);
+      end = this->move_right(this->selection, 1);
       break;
     case WORD:
-      word_boundaries(editor, editor->selection, nullptr, &next_col, nullptr,
-                      nullptr);
-      end = {editor->selection.row, next_col};
+      this->word_boundaries(this->selection, nullptr, &next_col, nullptr,
+                            nullptr);
+      end = {this->selection.row, next_col};
       break;
     case LINE:
-      LineIterator *it = begin_l_iter(editor->root, editor->selection.row);
+      LineIterator *it = begin_l_iter(this->root, this->selection.row);
       char *line = next_line(it, &line_len);
       if (!line)
         return nullptr;
       if (line_len > 0 && line[line_len - 1] == '\n')
         line_len--;
-      end = {editor->selection.row, line_len};
+      end = {this->selection.row, line_len};
       free(it->buffer);
       free(it);
       break;
@@ -102,9 +100,9 @@ char *get_selection(Editor *editor, uint32_t *out_len, Coord *out_start) {
   if (out_start)
     *out_start = start;
   uint32_t start_byte =
-      line_to_byte(editor->root, start.row, nullptr) + start.col;
-  uint32_t end_byte = line_to_byte(editor->root, end.row, nullptr) + end.col;
-  char *text = read(editor->root, start_byte, end_byte - start_byte);
+      line_to_byte(this->root, start.row, nullptr) + start.col;
+  uint32_t end_byte = line_to_byte(this->root, end.row, nullptr) + end.col;
+  char *text = read(this->root, start_byte, end_byte - start_byte);
   if (out_len)
     *out_len = end_byte - start_byte;
   return text;
diff --git a/src/editor/worker.cc b/src/editor/worker.cc
index 2329a08..2c73aea 100644
--- a/src/editor/worker.cc
+++ b/src/editor/worker.cc
@@ -1,37 +1,38 @@
 #include "editor/editor.h"
 
-void hover_diagnostic(Editor *editor) {
-  std::shared_lock lock(editor->v_mtx);
-  static uint32_t last_line = UINT32_MAX;
-  if (last_line == editor->cursor.row && !editor->warnings_dirty)
-    return;
-  VWarn dummy;
-  dummy.line = editor->cursor.row;
-  editor->warnings_dirty = false;
-  last_line = editor->cursor.row;
-  auto first =
-      std::lower_bound(editor->warnings.begin(), editor->warnings.end(), dummy);
-  auto last =
-      std::upper_bound(editor->warnings.begin(), editor->warnings.end(), dummy);
-  std::vector<VWarn> warnings_at_line(first, last);
-  if (warnings_at_line.size() == 0) {
-    editor->diagnostics_active = false;
-    return;
-  }
-  editor->diagnostics.clear();
-  editor->diagnostics.warnings.swap(warnings_at_line);
-  editor->diagnostics.render_first();
-  editor->diagnostics_active = true;
-}
+// void hover_diagnostic(Editor *editor) {
+//   static uint32_t last_line = UINT32_MAX;
+//   if (last_line == editor->cursor.row && !editor->warnings_dirty)
+//     return;
+//   VWarn dummy;
+//   dummy.line = editor->cursor.row;
+//   editor->warnings_dirty = false;
+//   last_line = editor->cursor.row;
+//   auto first =
+//       std::lower_bound(editor->warnings.begin(), editor->warnings.end(),
+//       dummy);
+//   auto last =
+//       std::upper_bound(editor->warnings.begin(), editor->warnings.end(),
+//       dummy);
+//   std::vector<VWarn> warnings_at_line(first, last);
+//   if (warnings_at_line.size() == 0) {
+//     editor->diagnostics_active = false;
+//     return;
+//   }
+//   editor->diagnostics.clear();
+//   editor->diagnostics.warnings.swap(warnings_at_line);
+//   editor->diagnostics.render_first();
+//   editor->diagnostics_active = true;
+// }
 
-void editor_worker(Editor *editor) {
-  if (!editor || !editor->root)
+void Editor::work() {
+  if (!this->root)
     return;
-  if (editor->parser)
-    editor->parser->work();
-  hover_diagnostic(editor);
-  if (editor->completion.active && editor->completion.hover_dirty) {
-    editor->completion.hover.render_first();
-    editor->completion.hover_dirty = false;
-  }
+  if (this->parser)
+    this->parser->work();
+  // hover_diagnostic(this);
+  // if (this->completion.active && this->completion.hover_dirty) {
+  //   this->completion.hover.render_first();
+  //   this->completion.hover_dirty = false;
+  // }
 }
diff --git a/src/extentions/completion.cc b/src/extentions/completion.cc
new file mode 100644
index 0000000..e69de29
diff --git a/src/ui/hover.cc b/src/extentions/hover.cc
similarity index 57%
rename from src/ui/hover.cc
rename to src/extentions/hover.cc
index d0df429..8e49f7a 100644
--- a/src/ui/hover.cc
+++ b/src/extentions/hover.cc
@@ -1,12 +1,15 @@
-#include "ui/hover.h"
+#include "extentions/hover.h"
 #include "syntax/decl.h"
+#include "windows/decl.h"
 
-void HoverBox::clear() {
-  text = "";
-  scroll_ = 0;
-  is_markup = false;
-  size = {0, 0};
-  cells.clear();
+TileRoot *init_hover() {
+  auto root = std::make_unique<TileRoot>();
+  root->tile = std::make_unique<HoverBox>();
+  root->pos = {0, 0};
+  root->size = {1, 1};
+  root->tile->hidden = true;
+  popups.push_back(std::move(root));
+  return popups.back().get();
 }
 
 void HoverBox::scroll(int32_t number) {
@@ -19,13 +22,23 @@ void HoverBox::scroll(int32_t number) {
   scroll_ = MAX((int32_t)scroll_ + number, 0);
   if (scroll_ > line_count)
     scroll_ = line_count;
-  render_first(true);
+  scroll_dirty = true;
 }
 
-void HoverBox::render_first(bool scroll) {
-  if (!scroll) {
+void HoverBox::render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) {
+  if (scroll_dirty) {
     // TODO: call syntax highlighter here
   }
+  // int32_t start_row = (int32_t)pos.row - (int32_t)size.row;
+  // if (start_row < 0)
+  //   start_row = pos.row + 1;
+  // int32_t start_col = pos.col; // pos here is the cursor pos
+  Coord screen_size = get_size();
+  // if (start_col + size.col > screen_size.col) {
+  //   start_col = screen_size.col - size.col;
+  //   if (start_col < 0)
+  //     start_col = 0;
+  // }
   uint32_t longest_line = 0;
   uint32_t current_width = 0;
   for (size_t j = 0; j < text.length(); j++) {
@@ -36,7 +49,7 @@ void HoverBox::render_first(bool scroll) {
       current_width += 1;
     }
   }
-  // HACK: the 1 is added so the longest line doesnt wrap which should be fixed
+  // HACK: the 1 is added so the longest line doesnt wrap which should befixed
   //       in the loop instead as it was never meant to wrap in the first place
   longest_line = MAX(longest_line, current_width) + 1;
   uint32_t content_width = MIN(longest_line, 130u);
@@ -50,10 +63,19 @@ void HoverBox::render_first(bool scroll) {
   }
   uint32_t border_fg = 0x82AAFF;
   uint32_t base_bg = 0;
-  cells.assign(size.col * 26, ScreenCell{" ", 0, 0, 0, 0, 0});
   auto set = [&](uint32_t r, uint32_t c, const char *text, uint32_t fg,
-                 uint32_t bg, uint8_t flags) {
-    cells[r * size.col + c] = {std::string(text), 0, fg, bg, flags, 0};
+                 uint32_t bg, uint8_t flags, uint32_t width) {
+    if (r < 0 || r >= size.row || c < 0 || c >= size.col)
+      return;
+    r += pos.row;
+    c += pos.col;
+    ScreenCell &cell = buffer[r * screen_size.col + c];
+    cell.utf8 = text;
+    cell.width = width;
+    cell.fg = fg;
+    cell.bg = bg;
+    cell.flags = flags;
+    cell.ul_color = 0;
   };
   uint32_t r = 0;
   while (i < text.length() && r < 24) {
@@ -75,45 +97,27 @@ void HoverBox::render_first(bool scroll) {
       uint32_t fg = hl ? hl->fg : 0xFFFFFF;
       uint32_t bg = hl ? hl->bg : 0;
       uint32_t flags = hl ? hl->flags : 0;
-      set(r + 1, c + 1, cluster.c_str(), fg, bg | base_bg, flags);
+      set(r + 1, c + 1, cluster.c_str(), fg, bg | base_bg, flags, width);
       c += width;
       i += cluster_len;
       for (int w = 1; w < width; w++)
-        set(r + 1, c - w + 1, "\x1b", 0xFFFFFF, base_bg, 0);
+        set(r + 1, c - w + 1, "\x1b", 0xFFFFFF, base_bg, 0, 0);
     }
     r++;
   }
-  if (!scroll)
+  if (scroll_dirty)
     size.row = r + 2;
-  set(0, 0, "┌", border_fg, base_bg, 0);
+  set(0, 0, "┌", border_fg, base_bg, 0, 1);
   for (uint32_t i = 1; i < size.col - 1; i++)
-    set(0, i, "─", border_fg, base_bg, 0);
-  set(0, size.col - 1, "┐", border_fg, base_bg, 0);
+    set(0, i, "─", border_fg, base_bg, 0, 1);
+  set(0, size.col - 1, "┐", border_fg, base_bg, 0, 1);
   for (uint32_t r = 1; r < size.row - 1; r++) {
-    set(r, 0, "│", border_fg, base_bg, 0);
-    set(r, size.col - 1, "│", border_fg, base_bg, 0);
+    set(r, 0, "│", border_fg, base_bg, 0, 1);
+    set(r, size.col - 1, "│", border_fg, base_bg, 0, 1);
   }
-  set(size.row - 1, 0, "└", border_fg, base_bg, 0);
+  set(size.row - 1, 0, "└", border_fg, base_bg, 0, 1);
   for (uint32_t i = 1; i < size.col - 1; i++)
-    set(size.row - 1, i, "─", border_fg, base_bg, 0);
-  set(size.row - 1, size.col - 1, "┘", border_fg, base_bg, 0);
-  cells.resize(size.col * size.row);
-}
-
-void HoverBox::render(Coord pos) {
-  int32_t start_row = (int32_t)pos.row - (int32_t)size.row;
-  if (start_row < 0)
-    start_row = pos.row + 1;
-  int32_t start_col = pos.col;
-  Coord screen_size = get_size();
-  if (start_col + size.col > screen_size.col) {
-    start_col = screen_size.col - size.col;
-    if (start_col < 0)
-      start_col = 0;
-  }
-  for (uint32_t r = 0; r < size.row; r++)
-    for (uint32_t c = 0; c < size.col; c++)
-      update(start_row + r, start_col + c, cells[r * size.col + c].utf8,
-             cells[r * size.col + c].fg, cells[r * size.col + c].bg,
-             cells[r * size.col + c].flags);
+    set(size.row - 1, i, "─", border_fg, base_bg, 0, 1);
+  set(size.row - 1, size.col - 1, "┘", border_fg, base_bg, 0, 1);
+  scroll_dirty = false;
 }
diff --git a/src/io/renderer.cc b/src/io/renderer.cc
index 6d33cfe..92b3010 100644
--- a/src/io/renderer.cc
+++ b/src/io/renderer.cc
@@ -1,10 +1,9 @@
 #include "io/sysio.h"
 
+std::vector<ScreenCell> new_screen;
 static uint32_t rows, cols;
 static bool show_cursor = 0;
-static std::vector<ScreenCell> screen;
 static std::vector<ScreenCell> old_screen;
-static std::mutex screen_mutex;
 static termios orig_termios;
 
 void disable_raw_mode() {
@@ -24,7 +23,7 @@ void enable_raw_mode() {
   raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
   raw.c_oflag &= ~(OPOST);
   raw.c_cflag |= (CS8);
-  raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
+  raw.c_lflag &= ~(ECHO | ICANON | IEXTEN); // | ISIG);
   raw.c_cc[VMIN] = 0;
   raw.c_cc[VTIME] = 0;
   if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
@@ -39,7 +38,7 @@ Coord start_screen() {
   ioctl(0, TIOCGWINSZ, &w);
   rows = w.ws_row;
   cols = w.ws_col;
-  screen.assign(rows * cols, {});
+  new_screen.assign(rows * cols, {});
   old_screen.assign(rows * cols, {});
   return {rows, cols};
 }
@@ -48,71 +47,7 @@ void end_screen() { disable_raw_mode(); }
 
 Coord get_size() { return {rows, cols}; }
 
-void update(uint32_t row, uint32_t col, std::string utf8, uint32_t fg,
-            uint32_t bg, uint8_t flags) {
-  if (row >= rows || col >= cols)
-    return;
-  uint32_t idx = row * cols + col;
-  std::lock_guard<std::mutex> lock(screen_mutex);
-  screen[idx].utf8 = utf8 != "" ? utf8 : "";
-  if (utf8 == "")
-    return;
-  screen[idx].width = display_width(utf8.c_str(), utf8.size());
-  screen[idx].fg = fg;
-  screen[idx].bg = bg;
-  screen[idx].flags = flags;
-  screen[idx].ul_color = 0;
-}
-
-void update(uint32_t row, uint32_t col, const char *utf8, uint32_t fg,
-            uint32_t bg, uint8_t flags) {
-  if (row >= rows || col >= cols)
-    return;
-  uint32_t idx = row * cols + col;
-  std::lock_guard<std::mutex> lock(screen_mutex);
-  screen[idx].utf8 = utf8 ? utf8 : "";
-  if (utf8 == nullptr)
-    return;
-  screen[idx].width = display_width(utf8, strlen(utf8));
-  screen[idx].fg = fg;
-  screen[idx].bg = bg;
-  screen[idx].flags = flags;
-  screen[idx].ul_color = 0;
-}
-
-void update(uint32_t row, uint32_t col, std::string utf8, uint32_t fg,
-            uint32_t bg, uint8_t flags, uint32_t ul_color) {
-  if (row >= rows || col >= cols)
-    return;
-  uint32_t idx = row * cols + col;
-  std::lock_guard<std::mutex> lock(screen_mutex);
-  screen[idx].utf8 = utf8 != "" ? utf8 : "";
-  if (utf8 == "")
-    return;
-  screen[idx].width = display_width(utf8.c_str(), utf8.size());
-  screen[idx].fg = fg;
-  screen[idx].bg = bg;
-  screen[idx].flags = flags;
-  screen[idx].ul_color = ul_color;
-}
-
-void update(uint32_t row, uint32_t col, const char *utf8, uint32_t fg,
-            uint32_t bg, uint8_t flags, uint32_t ul_color) {
-  if (row >= rows || col >= cols)
-    return;
-  uint32_t idx = row * cols + col;
-  std::lock_guard<std::mutex> lock(screen_mutex);
-  screen[idx].utf8 = utf8 ? utf8 : "";
-  if (utf8 == nullptr)
-    return;
-  screen[idx].width = display_width(utf8, strlen(utf8));
-  screen[idx].fg = fg;
-  screen[idx].bg = bg;
-  screen[idx].flags = flags;
-  screen[idx].ul_color = ul_color;
-}
-
-void render() {
+void io_render() {
   static bool first_render = true;
   uint32_t current_fg = 0;
   uint32_t current_bg = 0;
@@ -121,7 +56,6 @@ void render() {
   bool current_bold = false;
   bool current_strikethrough = false;
   bool current_underline = false;
-  std::lock_guard<std::mutex> lock(screen_mutex);
   std::string out;
   out.reserve(static_cast<size_t>(rows) * static_cast<size_t>(cols) * 4 + 256);
   out += "\x1b[s\x1b[?25l";
@@ -135,7 +69,7 @@ void render() {
     for (uint32_t col = 0; col < cols; ++col) {
       uint32_t idx = row * cols + col;
       ScreenCell &old_cell = old_screen[idx];
-      ScreenCell &new_cell = screen[idx];
+      ScreenCell &new_cell = new_screen[idx];
       bool content_changed =
           old_cell.utf8 != new_cell.utf8 || old_cell.fg != new_cell.fg ||
           old_cell.bg != new_cell.bg || old_cell.flags != new_cell.flags ||
@@ -147,7 +81,7 @@ void render() {
             for (int64_t back = 1; back <= 4 && first_change_col - back >= 0;
                  ++back) {
               ScreenCell &prev_cell =
-                  screen[row * cols + (first_change_col - back)];
+                  new_screen[row * cols + (first_change_col - back)];
               if (prev_cell.width > 1) {
                 first_change_col -= back;
                 break;
@@ -165,7 +99,7 @@ void render() {
     for (uint32_t col = first_change_col; col <= last_change_col; ++col) {
       uint32_t idx = row * cols + col;
       ScreenCell &old_cell = old_screen[idx];
-      ScreenCell &new_cell = screen[idx];
+      ScreenCell &new_cell = new_screen[idx];
       uint32_t width = new_cell.width > 0 ? new_cell.width : 1;
       bool overlap = false;
       if (width > 1) {
@@ -173,7 +107,7 @@ void render() {
           uint32_t next_col = col + i;
           if (next_col >= cols)
             break;
-          const ScreenCell &next = screen[row * cols + next_col];
+          const ScreenCell &next = new_screen[row * cols + next_col];
           if (!is_empty_cell(next)) {
             overlap = true;
             break;
@@ -244,7 +178,7 @@ void render() {
           uint32_t next_col = col + i;
           if (next_col >= cols)
             break;
-          const ScreenCell &next = screen[row * cols + next_col];
+          const ScreenCell &next = new_screen[row * cols + next_col];
           if (!is_empty_cell(next))
             break;
           out.push_back(' ');
@@ -260,7 +194,7 @@ void render() {
             ScreenCell *cell = &new_cell;
             int back = 0;
             while ((int)col - back >= 0 && cell->utf8[0] == '\x1b')
-              cell = &screen[row * cols + col - ++back];
+              cell = &new_screen[row * cols + col - ++back];
             if (width >= cell->width)
               out.append(" ");
           }
diff --git a/src/lsp/handlers.cc b/src/lsp/handlers.cc
index 555f1de..e69de29 100644
--- a/src/lsp/handlers.cc
+++ b/src/lsp/handlers.cc
@@ -1,87 +0,0 @@
-#include "lsp/lsp.h"
-
-Queue<LSPOpenRequest> lsp_open_queue;
-
-void request_add_to_lsp(Language language, Editor *editor) {
-  lsp_open_queue.push({language, editor});
-}
-
-void add_to_lsp(Language language, Editor *editor) {
-  std::shared_ptr<LSPInstance> lsp = get_or_init_lsp(language.lsp_name);
-  if (!lsp)
-    return;
-  std::unique_lock lock(lsp->mtx);
-  if (editor->lsp == lsp)
-    return;
-  lsp->editors.push_back(editor);
-  lsp->open_queue.push({language, editor});
-  lock.unlock();
-}
-
-void open_editor(std::shared_ptr<LSPInstance> lsp,
-                 std::pair<Language, Editor *> entry) {
-  Language language = entry.first;
-  Editor *editor = entry.second;
-  if (editor->lsp == lsp)
-    return;
-  editor->lsp = lsp;
-  std::unique_lock lock3(editor->knot_mtx);
-  char *buf = read(editor->root, 0, editor->root->char_count);
-  std::string text(buf);
-  free(buf);
-  json message = {{"jsonrpc", "2.0"},
-                  {"method", "textDocument/didOpen"},
-                  {"params",
-                   {{"textDocument",
-                     {{"uri", editor->uri},
-                      {"languageId", language.name},
-                      {"version", 1},
-                      {"text", text}}}}}};
-  lock3.unlock();
-  lsp_send(lsp, message, nullptr);
-}
-
-static std::string find_lsp_id(std::shared_ptr<LSPInstance> needle) {
-  for (const auto &[id, lsp] : active_lsps)
-    if (lsp == needle)
-      return id;
-  return "";
-}
-
-void remove_from_lsp(Editor *editor) {
-  auto lsp = editor->lsp;
-  if (!lsp)
-    return;
-  std::unique_lock lock1(lsp->mtx);
-  lsp->editors.erase(
-      std::remove(lsp->editors.begin(), lsp->editors.end(), editor),
-      lsp->editors.end());
-  lock1.unlock();
-  std::unique_lock lock2(editor->lsp_mtx);
-  editor->lsp = nullptr;
-  lock2.unlock();
-  json message = {{"jsonrpc", "2.0"},
-                  {"method", "textDocument/didClose"},
-                  {"params", {{"textDocument", {{"uri", editor->uri}}}}}};
-  lsp_send(lsp, message, nullptr);
-  std::string lsp_id = find_lsp_id(lsp);
-  if (!lsp_id.empty() && lsp->editors.empty())
-    close_lsp(lsp_id);
-}
-
-void lsp_handle(std::shared_ptr<LSPInstance>, json message) {
-  std::string method = message.value("method", "");
-  if (method == "window/showMessage") {
-    if (message.contains("params")) {
-      auto &p = message["params"];
-      if (p.contains("message"))
-        log("%s\n", p["message"].get<std::string>().c_str());
-    }
-  } else if (method == "window/logMessage") {
-    if (message.contains("params")) {
-      auto &p = message["params"];
-      if (p.contains("message"))
-        log("%s\n", p["message"].get<std::string>().c_str());
-    }
-  }
-}
diff --git a/src/lsp/process.cc b/src/lsp/process.cc
index 0531b11..e69de29 100644
--- a/src/lsp/process.cc
+++ b/src/lsp/process.cc
@@ -1,242 +0,0 @@
-#include "lsp/lsp.h"
-
-static bool init_lsp(std::shared_ptr<LSPInstance> lsp) {
-  int in_pipe[2];
-  int out_pipe[2];
-  if (pipe(in_pipe) == -1 || pipe(out_pipe) == -1) {
-    perror("pipe");
-    return false;
-  }
-  pid_t pid = fork();
-  if (pid == -1) {
-    perror("fork");
-    return false;
-  }
-  if (pid == 0) {
-    dup2(in_pipe[0], STDIN_FILENO);
-    dup2(out_pipe[1], STDOUT_FILENO);
-    int devnull = open("/dev/null", O_WRONLY);
-    if (devnull >= 0) {
-      dup2(devnull, STDERR_FILENO);
-      close(devnull);
-    }
-    close(in_pipe[0]);
-    close(in_pipe[1]);
-    close(out_pipe[0]);
-    close(out_pipe[1]);
-    std::vector<char *> argv;
-    argv.push_back(const_cast<char *>(lsp->lsp->command.c_str()));
-    for (auto &arg : lsp->lsp->args)
-      argv.push_back(const_cast<char *>(arg.c_str()));
-    argv.push_back(nullptr);
-    execvp(lsp->lsp->command.c_str(), argv.data());
-    perror("execvp");
-    _exit(127);
-  }
-  lsp->pid = pid;
-  lsp->stdin_fd = in_pipe[1];
-  lsp->stdout_fd = out_pipe[0];
-  close(in_pipe[0]);
-  close(out_pipe[1]);
-  return true;
-}
-
-std::shared_ptr<LSPInstance> get_or_init_lsp(std::string lsp_id) {
-  std::unique_lock lock(active_lsps_mtx);
-  auto it = active_lsps.find(lsp_id);
-  if (it == active_lsps.end()) {
-    auto map_it = lsps.find(lsp_id);
-    if (map_it == lsps.end())
-      return nullptr;
-    std::shared_ptr<LSPInstance> lsp = std::make_shared<LSPInstance>();
-    lsp->lsp = &map_it->second;
-    if (!init_lsp(lsp))
-      return nullptr;
-    LSPPending *pending = new LSPPending();
-    pending->editor = nullptr;
-    pending->callback = [lsp, lsp_id](Editor *, const json &msg) {
-      if (msg.contains("result") && msg["result"].contains("capabilities")) {
-        auto &caps = msg["result"]["capabilities"];
-        // if (caps.contains("positionEncoding")) {
-        //   std::string s = caps["positionEncoding"].get<std::string>();
-        //   if (s == "utf-8")
-        //     lsp->is_utf8 = true;
-        //   log("Lsp name: %s, supports: %s", lsp->lsp->command.c_str(),
-        //       s.c_str());
-        // }
-        if (caps.contains("textDocumentSync")) {
-          auto &sync = caps["textDocumentSync"];
-          if (sync.is_number()) {
-            int change_type = sync.get<int>();
-            lsp->incremental_sync = (change_type == 2);
-          } else if (sync.is_object() && sync.contains("change")) {
-            int change_type = sync["change"].get<int>();
-            lsp->incremental_sync = (change_type == 2);
-          }
-        }
-        lsp->allow_formatting = caps.value("documentFormattingProvider", false);
-        if (lsp_id != "lua-language-server" /* Lua ls gives terrible ontype
-                                               formatting so disable */
-            && caps.contains("documentOnTypeFormattingProvider")) {
-          auto &fmt = caps["documentOnTypeFormattingProvider"];
-          if (fmt.is_object()) {
-            if (fmt.contains("firstTriggerCharacter")) {
-              std::string s = fmt["firstTriggerCharacter"].get<std::string>();
-              if (s.size() == 1)
-                lsp->format_chars.push_back(s[0]);
-            }
-            if (fmt.contains("moreTriggerCharacter")) {
-              for (auto &c : fmt["moreTriggerCharacter"]) {
-                std::string s = c.get<std::string>();
-                if (s.size() == 1)
-                  lsp->format_chars.push_back(s[0]);
-              }
-            }
-            lsp->allow_formatting_on_type = true;
-          } else if (fmt.is_boolean()) {
-            lsp->allow_formatting_on_type = fmt.get<bool>();
-          }
-        }
-        if (caps.contains("hoverProvider")) {
-          auto &hover = caps["hoverProvider"];
-          lsp->allow_hover =
-              hover.is_boolean() ? hover.get<bool>() : hover.is_object();
-        } else {
-          lsp->allow_hover = false;
-        }
-        if (caps.contains("completionProvider")) {
-          lsp->allow_completion = true;
-          if (caps["completionProvider"].contains("resolveProvider"))
-            lsp->allow_resolve =
-                caps["completionProvider"]["resolveProvider"].get<bool>();
-          if (caps["completionProvider"].contains("triggerCharacters")) {
-            auto &chars = caps["completionProvider"]["triggerCharacters"];
-            if (chars.is_array()) {
-              for (auto &c : chars) {
-                std::string str = c.get<std::string>();
-                if (str.size() != 1)
-                  continue;
-                lsp->trigger_chars.push_back(str[0]);
-              }
-            }
-          }
-          if (caps["completionProvider"].contains("allCommitCharacters")) {
-            auto &chars = caps["completionProvider"]["allCommitCharacters"];
-            if (chars.is_array()) {
-              for (auto &c : chars) {
-                std::string str = c.get<std::string>();
-                if (str.size() != 1)
-                  continue;
-                lsp->end_chars.push_back(str[0]);
-              }
-            }
-          }
-        }
-      }
-      lsp->initialized = true;
-      json initialized = {{"jsonrpc", "2.0"},
-                          {"method", "initialized"},
-                          {"params", json::object()}};
-      lsp_send(lsp, initialized, nullptr);
-    };
-    json init_message = {
-        {"jsonrpc", "2.0"},
-        {"method", "initialize"},
-        {"params",
-         {{"processId", getpid()},
-          {"rootUri", "file://" + percent_encode(path_abs("."))},
-          {"capabilities", client_capabilities}}}};
-    lsp_send(lsp, init_message, pending);
-    active_lsps[lsp_id] = lsp;
-    return lsp;
-  }
-  return it->second;
-}
-
-void close_lsp(std::string lsp_id) {
-  std::shared_ptr<LSPInstance> lsp;
-  {
-    std::shared_lock lock(active_lsps_mtx);
-    auto it = active_lsps.find(lsp_id);
-    if (it == active_lsps.end())
-      return;
-    lsp = it->second;
-  }
-  if (!lsp || lsp->pid == -1 || lsp->exited)
-    return;
-  lsp->exited = true;
-  lsp->initialized = false;
-  auto send_raw = [&](const json &msg) {
-    std::string payload = msg.dump();
-    std::string header =
-        "Content-Length: " + std::to_string(payload.size()) + "\r\n\r\n";
-    std::string out = header + payload;
-    const char *ptr = out.data();
-    size_t remaining = out.size();
-    while (remaining > 0) {
-      ssize_t n = write(lsp->stdin_fd, ptr, remaining);
-      if (n <= 0) {
-        if (errno == EINTR)
-          continue;
-        break;
-      }
-      ptr += n;
-      remaining -= n;
-    }
-  };
-  json shutdown = {{"jsonrpc", "2.0"}, {"id", 1}, {"method", "shutdown"}};
-  send_raw(shutdown);
-  {
-    pollfd pfd{lsp->stdout_fd, POLLIN, 0};
-    int timeout_ms = 300;
-    if (poll(&pfd, 1, timeout_ms) > 0) {
-      auto msg = read_lsp_message(lsp->stdout_fd);
-      (void)msg;
-    }
-  }
-  json exit_msg = {{"jsonrpc", "2.0"}, {"method", "exit"}};
-  send_raw(exit_msg);
-  const int max_wait_ms = 500;
-  int waited = 0;
-  while (waited < max_wait_ms) {
-    int status;
-    pid_t res = waitpid(lsp->pid, &status, WNOHANG);
-    if (res == lsp->pid)
-      break;
-    std::this_thread::sleep_for(std::chrono::milliseconds(10));
-    waited += 10;
-  }
-  if (kill(lsp->pid, 0) == 0) {
-    kill(lsp->pid, SIGKILL);
-    waitpid(lsp->pid, nullptr, 0);
-  }
-  close(lsp->stdin_fd);
-  close(lsp->stdout_fd);
-  {
-    std::unique_lock lock(lsp->mtx);
-    for (auto &kv : lsp->pending)
-      delete kv.second;
-    lsp->pending.clear();
-  }
-  for (auto &editor : lsp->editors) {
-    std::unique_lock editor_lock(editor->lsp_mtx);
-    editor->lsp = nullptr;
-  }
-  {
-    std::unique_lock lock(active_lsps_mtx);
-    active_lsps.erase(lsp_id);
-  }
-}
-
-void clean_lsp(std::shared_ptr<LSPInstance> lsp, std::string lsp_id) {
-  for (auto &kv : lsp->pending)
-    delete kv.second;
-  lsp->pid = -1;
-  close(lsp->stdin_fd);
-  close(lsp->stdout_fd);
-  for (auto &editor : lsp->editors) {
-    std::unique_lock editor_lock(editor->lsp_mtx);
-    editor->lsp = nullptr;
-  }
-  active_lsps.erase(lsp_id);
-}
diff --git a/src/lsp/worker.cc b/src/lsp/worker.cc
new file mode 100644
index 0000000..9a2281f
--- /dev/null
+++ b/src/lsp/worker.cc
@@ -0,0 +1,44 @@
+#include "lsp/lsp.h"
+
+namespace lsp {
+std::mutex lsp_mutex;
+std::unordered_map<std::string, std::unique_ptr<LSPInstance>> active_lsps;
+std::unordered_set<std::string> opened;
+Queue<std::string> need_opening;
+std::vector<Editor *> new_editors;
+} // namespace lsp
+
+void lsp_worker() {
+  std::lock_guard lock(lsp::lsp_mutex);
+  while (!lsp::need_opening.empty()) {
+    auto lsp_id = *lsp::need_opening.front();
+    if (!lsp::opened.contains(lsp_id)) {
+      lsp::active_lsps[lsp_id] = std::make_unique<LSPInstance>(lsp_id);
+      lsp::opened.insert(lsp_id);
+    }
+    lsp::need_opening.pop();
+  }
+  for (auto it = lsp::new_editors.begin(); it != lsp::new_editors.end();) {
+    auto ed = *it;
+    auto lsp_id = ed->lang.lsp_name;
+    if (lsp::opened.contains(lsp_id)) {
+      auto a_it = lsp::active_lsps.find(lsp_id);
+      if (a_it != lsp::active_lsps.end())
+        a_it->second->add(ed);
+      it = lsp::new_editors.erase(it);
+    } else {
+      lsp::need_opening.push(lsp_id);
+      it++;
+    }
+  }
+  for (auto it = lsp::active_lsps.begin(); it != lsp::active_lsps.end();) {
+    auto &lsp_inst = it->second;
+    if (!lsp_inst || lsp_inst->pid == -1 || lsp_inst->editors.empty() ||
+        lsp_inst->exited) {
+      it = lsp::active_lsps.erase(it);
+      continue;
+    }
+    lsp_inst->work();
+    ++it;
+  }
+}
diff --git a/src/lsp/workers.cc b/src/lsp/workers.cc
deleted file mode 100644
index 8a6132d..0000000
--- a/src/lsp/workers.cc
+++ /dev/null
@@ -1,170 +0,0 @@
-#include "lsp/lsp.h"
-
-std::shared_mutex active_lsps_mtx;
-std::unordered_map<std::string, std::shared_ptr<LSPInstance>> active_lsps;
-
-void lsp_send(std::shared_ptr<LSPInstance> lsp, json message,
-              LSPPending *pending) {
-  if (!lsp || lsp->stdin_fd == -1)
-    return;
-  std::unique_lock lock(lsp->mtx);
-  if (pending) {
-    message["id"] = lsp->last_id++;
-    uint32_t id = message["id"].get<uint32_t>();
-    lsp->pending[id] = pending;
-  }
-  lsp->outbox.push(message);
-}
-
-std::optional<json> read_lsp_message(int fd) {
-  std::string header;
-  char c;
-  while (true) {
-    ssize_t n = read(fd, &c, 1);
-    if (n <= 0)
-      return std::nullopt;
-    header.push_back(c);
-    if (header.size() >= 4 && header.substr(header.size() - 4) == "\r\n\r\n")
-      break;
-  }
-  size_t pos = header.find("Content-Length:");
-  if (pos == std::string::npos)
-    return std::nullopt;
-  pos += strlen("Content-Length:");
-  while (pos < header.size() && std::isspace(header[pos]))
-    pos++;
-  size_t end = pos;
-  while (end < header.size() && std::isdigit(header[end]))
-    end++;
-  size_t len = std::stoul(header.substr(pos, end - pos));
-  std::string body(len, '\0');
-  size_t got = 0;
-  while (got < len) {
-    ssize_t n = read(fd, &body[got], len - got);
-    if (n <= 0)
-      return std::nullopt;
-    got += n;
-  }
-  return json::parse(body);
-}
-
-static Editor *editor_for_uri(std::shared_ptr<LSPInstance> lsp,
-                              std::string uri) {
-  if (uri.empty())
-    return nullptr;
-  for (auto &editor : lsp->editors)
-    if (editor->uri == uri)
-      return editor;
-  return nullptr;
-}
-
-void lsp_worker() {
-  LSPOpenRequest request;
-  while (lsp_open_queue.pop(request))
-    add_to_lsp(request.language, request.editor);
-  std::unique_lock active_lsps_lock(active_lsps_mtx);
-  for (auto &kv : active_lsps) {
-    std::shared_ptr<LSPInstance> lsp = kv.second;
-    std::unique_lock lock(lsp->mtx);
-    int status;
-    pid_t res = waitpid(lsp->pid, &status, WNOHANG);
-    if (res == lsp->pid) {
-      clean_lsp(lsp, kv.first);
-      return;
-    }
-    if (lsp->initialized) {
-      std::pair<Language, Editor *> request;
-      while (lsp->open_queue.pop(request)) {
-        lock.unlock();
-        open_editor(lsp, request);
-        lock.lock();
-      }
-    }
-    while (!lsp->outbox.empty()) {
-      json message = lsp->outbox.front();
-      std::string m = message.value("method", "");
-      if (lsp->exited) {
-        if (m != "exit" && m != "shutdown") {
-          lsp->outbox.pop(message);
-          continue;
-        }
-      }
-      if (!lsp->initialized) {
-        if (m != "initialize" && m != "exit" && m != "shutdown")
-          break;
-      }
-      lsp->outbox.pop(message);
-      std::string payload = message.dump();
-      std::string header =
-          "Content-Length: " + std::to_string(payload.size()) + "\r\n\r\n";
-      std::string out = header + payload;
-      const char *ptr = out.data();
-      size_t remaining = out.size();
-      while (remaining > 0) {
-        int status;
-        pid_t res = waitpid(lsp->pid, &status, WNOHANG);
-        if (res == lsp->pid) {
-          clean_lsp(lsp, kv.first);
-          return;
-        }
-        ssize_t written = write(lsp->stdin_fd, ptr, remaining);
-        if (written == 0)
-          break;
-        else if (written == -1) {
-          if (errno == EINTR)
-            continue;
-          perror("write");
-          clean_lsp(lsp, kv.first);
-          return;
-        } else {
-          ptr += written;
-          remaining -= written;
-        }
-      }
-    }
-    pollfd pfd{lsp->stdout_fd, POLLIN | POLLHUP | POLLERR, 0};
-    int r = poll(&pfd, 1, 0);
-    if (r > 0 && pfd.revents & (POLLHUP | POLLERR)) {
-      clean_lsp(lsp, kv.first);
-      return;
-    }
-    while ((r = poll(&pfd, 1, 0) > 0)) {
-      if (r > 0 && pfd.revents & (POLLHUP | POLLERR)) {
-        clean_lsp(lsp, kv.first);
-        return;
-      }
-      auto msg = read_lsp_message(lsp->stdout_fd);
-      if (!msg)
-        break;
-      if (msg->contains("id")) {
-        uint32_t id = msg->at("id").get<uint32_t>();
-        auto it = lsp->pending.find(id);
-        if (it != lsp->pending.end()) {
-          LSPPending *pend = it->second;
-          lock.unlock();
-          if (pend->callback)
-            pend->callback(pend->editor, *msg);
-          delete pend;
-          lock.lock();
-          lsp->pending.erase(it);
-        }
-      } else if (msg->contains("method")) {
-        std::string uri;
-        if (msg->contains("params")) {
-          auto &p = (*msg)["params"];
-          if (p.contains("textDocument") && p["textDocument"].contains("uri"))
-            uri = p["textDocument"]["uri"].get<std::string>();
-          else if (p.contains("uri"))
-            uri = p["uri"].get<std::string>();
-        }
-        Editor *ed = editor_for_uri(lsp, uri);
-        lock.unlock();
-        if (ed)
-          editor_lsp_handle(ed, *msg);
-        else
-          lsp_handle(lsp, *msg);
-        lock.lock();
-      }
-    }
-  }
-}
diff --git a/src/main.cc b/src/main.cc
index d70d002..0893134 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -1,42 +1,28 @@
 #include "main.h"
 #include "editor/editor.h"
+#include "extentions/hover.h"
 #include "io/sysio.h"
 #include "lsp/lsp.h"
 #include "ruby/decl.h"
 #include "ui/bar.h"
 #include "utils/utils.h"
+#include "windows/decl.h"
 
 std::atomic<bool> running{true};
 Queue<KeyEvent> event_queue;
-std::vector<Editor *> editors;
-Bar bar;
-
-uint8_t current_editor = 0;
+fs::path pwd;
 std::atomic<uint8_t> mode = NORMAL;
 
+namespace ui {
+Bar bar;
+TileRoot *hover_popup = nullptr;
+} // namespace ui
+
 void background_lsp() {
   while (running)
     throttle(8ms, lsp_worker);
 }
 
-inline Editor *editor_at(uint8_t x, uint8_t y) {
-  for (Editor *ed : editors) {
-    Coord pos = ed->position;
-    Coord size = ed->size;
-    if (x >= pos.col && x < pos.col + size.col && y >= pos.row &&
-        y < pos.row + size.row)
-      return ed;
-  }
-  return nullptr;
-}
-
-inline uint8_t index_of(Editor *ed) {
-  for (uint8_t i = 0; i < editors.size(); i++)
-    if (editors[i] == ed)
-      return i;
-  return 0;
-}
-
 int main(int argc, char *argv[]) {
   ruby_start();
   load_theme();
@@ -46,54 +32,45 @@ int main(int argc, char *argv[]) {
   Coord screen = start_screen();
   const char *filename = (argc > 1) ? argv[1] : "";
   uint8_t eol = read_line_endings();
-  Editor *editor =
-      new_editor(filename, {0, 0}, {screen.row - 2, screen.col}, eol);
-  bar.init(screen);
 
-  if (!editor) {
-    end_screen();
-    fprintf(stderr, "Failed to load editor\n");
-    return 1;
-  }
+  ui::hover_popup = init_hover();
 
-  editors.push_back(editor);
-  current_editor = editors.size() - 1;
+  root_tile.size = {screen.row - 2, screen.col - 1};
+  root_tile.pos = {0, 0};
+
+  root_tile.tile = std::make_unique<Editor>(filename, eol);
+  focused_window = static_cast<Editor *>(root_tile.tile.get());
+  ui::bar.init(screen);
 
   std::thread lsp_thread(background_lsp);
 
   while (running) {
     KeyEvent event = throttle(1ms, read_key);
-    if (event.key_type == KEY_NONE)
-      goto render;
-    if (event.key_type == KEY_CHAR && event.len == 1 &&
-        event.c[0] == CTRL('q')) {
-      free(event.c);
-      running = false;
-      break;
-    }
-    if (mode != RUNNER) {
-      if (event.key_type == KEY_MOUSE) {
-        Editor *target = editor_at(event.mouse_x, event.mouse_y);
-        if (target) {
-          if (event.mouse_state == PRESS)
-            current_editor = index_of(target);
-          event.mouse_x -= target->position.col;
-          event.mouse_y -= target->position.row;
-          handle_editor_event(target, event);
+    if (event.key_type != KEY_NONE) {
+      if (event.key_type == KEY_CHAR && event.len == 1 &&
+          event.c[0] == CTRL('q')) {
+        free(event.c);
+        running = false;
+        break;
+      }
+      if (mode != RUNNER) {
+        if (event.key_type == KEY_MOUSE) {
+          handle_click(event);
+        } else {
+          focused_window->handle_event(event);
         }
       } else {
-        handle_editor_event(editors[current_editor], event);
+        ui::bar.handle_event(event);
       }
-    } else {
-      bar.handle(event);
+      if ((event.key_type == KEY_CHAR || event.key_type == KEY_PASTE) &&
+          event.c)
+        free(event.c);
     }
-    if ((event.key_type == KEY_CHAR || event.key_type == KEY_PASTE) && event.c)
-      free(event.c);
-  render:
-    throttle(4ms, editor_worker, editors[current_editor]);
-    bar.render();
-    render_editor(editors[current_editor]);
+    for (auto &lsp_inst : lsp::active_lsps)
+      lsp_inst.second->callbacks();
+    focused_window->work();
     throttle(4ms, render);
+    throttle(4ms, io_render);
   }
 
   if (lsp_thread.joinable())
@@ -101,9 +78,6 @@ int main(int argc, char *argv[]) {
 
   end_screen();
 
-  for (auto editor : editors)
-    free_editor(editor);
-
   ruby_shutdown();
 
   return 0;
diff --git a/src/ruby/process.cc b/src/ruby/process.cc
index 2117ee3..182ac2e 100644
--- a/src/ruby/process.cc
+++ b/src/ruby/process.cc
@@ -89,8 +89,8 @@ static mrb_value sym_flags;
 static mrb_value sym_start;
 static mrb_value sym_length;
 static mrb_value sym_mode;
-static mrb_value sym_lang_name;
-static mrb_value sym_filename;
+static mrb_value sym_data;
+static mrb_value sym_foldername;
 static mrb_value sym_width;
 static mrb_value sym_normal;
 static mrb_value sym_insert;
@@ -105,8 +105,8 @@ inline void initialize_symbols() {
   sym_start = mrb_symbol_value(mrb_intern_cstr(mrb, "start"));
   sym_length = mrb_symbol_value(mrb_intern_cstr(mrb, "length"));
   sym_mode = mrb_symbol_value(mrb_intern_cstr(mrb, "mode"));
-  sym_lang_name = mrb_symbol_value(mrb_intern_cstr(mrb, "lang_name"));
-  sym_filename = mrb_symbol_value(mrb_intern_cstr(mrb, "filename"));
+  sym_data = mrb_symbol_value(mrb_intern_cstr(mrb, "data"));
+  sym_foldername = mrb_symbol_value(mrb_intern_cstr(mrb, "foldername"));
   sym_width = mrb_symbol_value(mrb_intern_cstr(mrb, "width"));
   sym_normal = mrb_symbol_value(mrb_intern_cstr(mrb, "normal"));
   sym_insert = mrb_symbol_value(mrb_intern_cstr(mrb, "insert"));
@@ -146,10 +146,8 @@ convert_highlights(mrb_state *mrb, mrb_value highlights_val) {
   return result;
 }
 
-BarLine bar_contents(uint8_t mode, std::string lang_name, uint32_t warnings,
-                     std::string lsp_name, std::string filename,
-                     std::string foldername, uint32_t line, uint32_t max_line,
-                     uint32_t width) {
+BarLine bar_contents(uint8_t mode, uint32_t width, std::string foldername,
+                     Window *window) {
   BarLine bar_line;
   static bool initialed = false;
   if (!initialed) {
@@ -158,7 +156,6 @@ BarLine bar_contents(uint8_t mode, std::string lang_name, uint32_t warnings,
   }
   int ai = mrb_gc_arena_save(mrb);
   mrb_value info = mrb_hash_new(mrb);
-  mrb_value key_mode = sym_mode;
   mrb_value val_mode;
   switch (mode) {
   case NORMAL:
@@ -177,18 +174,20 @@ BarLine bar_contents(uint8_t mode, std::string lang_name, uint32_t warnings,
     val_mode = sym_jumper;
     break;
   }
-  mrb_hash_set(mrb, info, key_mode, val_mode);
-  mrb_value key_lang_name = sym_lang_name;
-  mrb_value val_lang_name =
-      mrb_symbol_value(mrb_intern_cstr(mrb, lang_name.c_str()));
-  mrb_hash_set(mrb, info, key_lang_name, val_lang_name);
-  mrb_value key_filename = sym_filename;
-  mrb_value val_filename =
-      mrb_str_new(mrb, filename.c_str(), filename.length());
-  mrb_hash_set(mrb, info, key_filename, val_filename);
-  mrb_value key_width = sym_width;
+  mrb_hash_set(mrb, info, sym_mode, val_mode);
+  mrb_value val_foldername =
+      mrb_str_new(mrb, foldername.c_str(), foldername.length());
+  mrb_hash_set(mrb, info, sym_foldername, val_foldername);
+  std::array<std::string, 5> arr = window->bar_info();
+  mrb_value ary = mrb_ary_new(mrb);
+  mrb_ary_push(mrb, ary, mrb_str_new(mrb, arr[0].c_str(), arr[0].length()));
+  mrb_ary_push(mrb, ary, mrb_str_new(mrb, arr[1].c_str(), arr[1].length()));
+  mrb_ary_push(mrb, ary, mrb_str_new(mrb, arr[2].c_str(), arr[2].length()));
+  mrb_ary_push(mrb, ary, mrb_str_new(mrb, arr[3].c_str(), arr[3].length()));
+  mrb_ary_push(mrb, ary, mrb_str_new(mrb, arr[4].c_str(), arr[4].length()));
+  mrb_hash_set(mrb, info, sym_data, ary);
   mrb_value val_width = mrb_fixnum_value(width);
-  mrb_hash_set(mrb, info, key_width, val_width);
+  mrb_hash_set(mrb, info, sym_width, val_width);
   mrb_value mod_val = mrb_obj_value(C_module);
   mrb_value block = mrb_funcall(mrb, mod_val, "b_bar", 0);
   mrb_value val_line = mrb_funcall(mrb, block, "call", 1, info);
diff --git a/src/syntax/parser.cc b/src/syntax/parser.cc
index da7e554..454392e 100644
--- a/src/syntax/parser.cc
+++ b/src/syntax/parser.cc
@@ -74,7 +74,6 @@ void Parser::work() {
     line_count = line_tree.count();
     if (c_line > 0 && c_line < line_count)
       prev_state = line_tree.at(c_line - 1)->out_state;
-    std::shared_lock k_lock(editor->knot_mtx);
     LineIterator *it = begin_l_iter(editor->root, c_line);
     if (!it)
       continue;
diff --git a/src/ui/bar.cc b/src/ui/bar.cc
index 79d003c..583a3df 100644
--- a/src/ui/bar.cc
+++ b/src/ui/bar.cc
@@ -3,17 +3,24 @@
 #include "lsp/lsp.h"
 #include "main.h"
 #include "syntax/decl.h"
+#include "windows/decl.h"
 
 void Bar::log(std::string message) { log_line = message; }
 
-void Bar::render() {
+void Bar::render(std::vector<ScreenCell> &buffer) {
   USING(LSPInstance);
-  Editor *editor = editors[current_editor];
-  BarLine bar_line =
-      bar_contents(mode, editor->lang.name, editor->warnings.size(),
-                   editor->lsp ? editor->lsp->lsp->command : "",
-                   editor->filename, editor->filename, editor->cursor.row + 1,
-                   editor->root->line_count + 1, screen.col);
+  BarLine bar_line;
+  bar_line = bar_contents(mode, screen.col, pwd.string(), focused_window);
+  auto update = [&](uint32_t row, uint32_t col, std::string text, uint32_t fg,
+                    uint32_t bg, uint8_t flags, uint32_t width) {
+    ScreenCell &c = buffer[row * screen.col + col];
+    c.utf8 = text;
+    c.width = width;
+    c.fg = fg;
+    c.bg = bg;
+    c.flags = flags;
+    c.ul_color = 0;
+  };
   uint32_t row = screen.row - 2;
   uint32_t width = screen.col;
   std::string &line = bar_line.line;
@@ -26,43 +33,46 @@ void Bar::render() {
     int width = display_width(cluster.c_str(), cluster_len);
     Highlight highlight = bar_line.get_highlight(col);
     update(row, col, cluster.c_str(), highlight.fg, highlight.bg,
-           highlight.flags);
+           highlight.flags, width);
     col += width;
     i += cluster_len;
     for (int w = 1; w < width; w++)
-      update(row, col - w, "\x1b", highlight.fg, highlight.bg, highlight.flags);
+      update(row, col - w, "\x1b", highlight.fg, highlight.bg, highlight.flags,
+             0);
   }
   while (col < width)
-    update(row, col++, " ", 0, 0, 0);
+    update(row, col++, " ", 0, 0, 0, 1);
   col = 0;
   row++;
   if (mode == RUNNER) {
-    update(row, col++, ":", 0xFFFFFF, 0, 0);
+    update(row, col++, ":", 0xFFFFFF, 0, 0, 1);
     for (char c : command)
-      update(row, col++, (char[2]){c, 0}, 0xFFFFFF, 0, 0);
+      update(row, col++, (char[2]){c, 0}, 0xFFFFFF, 0, 0, 1);
   } else {
     for (char c : log_line)
-      update(row, col++, (char[2]){c, 0}, 0xFFFFFF, 0, 0);
+      update(row, col++, (char[2]){c, 0}, 0xFFFFFF, 0, 0, 1);
   }
   while (col < width)
-    update(row, col++, " ", 0, 0, 0);
+    update(row, col++, " ", 0, 0, 0, 1);
 }
 
-void Bar::handle(KeyEvent event) {
+void Bar::handle_command(std::string &command) {
+  if (command == "q") {
+    running = false;
+    return;
+  }
+  if (focused_window)
+    focused_window->handle_command(command);
+}
+
+void Bar::handle_event(KeyEvent event) {
   if (event.key_type == KEY_CHAR && event.len == 1) {
     if (event.c[0] == 0x1B) {
       command = "";
       mode = NORMAL;
     } else if (event.c[0] == '\n' || event.c[0] == '\r') {
       command = trim(command);
-      if (command == "w") {
-        save_file(editors[current_editor]);
-      } else if (command == "q") {
-        running = false;
-      } else if (command == "wq") {
-        save_file(editors[current_editor]);
-        running = false;
-      }
+      handle_command(command);
       mode = NORMAL;
       command = "";
     } else if (isprint((unsigned char)(event.c[0]))) {
diff --git a/src/ui/completionbox.cc b/src/ui/completionbox.cc
index be39ae7..daa8cf6 100644
--- a/src/ui/completionbox.cc
+++ b/src/ui/completionbox.cc
@@ -1,187 +1,187 @@
-#include "ui/completionbox.h"
-#include "editor/completions.h"
-#include "io/sysio.h"
-#include "utils/utils.h"
-
-std::string item_kind_name(uint8_t kind) {
-  switch (kind) {
-  case 1:
-    return "Text";
-  case 2:
-    return "Method";
-  case 3:
-    return "Function";
-  case 4:
-    return "Constructor";
-  case 5:
-    return "Field";
-  case 6:
-    return "Variable";
-  case 7:
-    return "Class";
-  case 8:
-    return "Interface";
-  case 9:
-    return "Module";
-  case 10:
-    return "Property";
-  case 11:
-    return "Unit";
-  case 12:
-    return "Value";
-  case 13:
-    return "Enum";
-  case 14:
-    return "Keyword";
-  case 15:
-    return "Snippet";
-  case 16:
-    return "Color";
-  case 17:
-    return "File";
-  case 18:
-    return "Reference";
-  case 19:
-    return "Folder";
-  case 20:
-    return "EnumMember";
-  case 21:
-    return "Constant";
-  case 22:
-    return "Struct";
-  case 23:
-    return "Event";
-  case 24:
-    return "Operator";
-  case 25:
-    return "TypeParameter";
-  default:
-    return "Unknown";
-  }
-}
-
-const char *item_symbol(uint8_t kind) { return "●"; }
-
-uint32_t kind_color(uint8_t kind) { return 0x82AAFF; }
-
-void CompletionBox::render_update() {
-  if (hidden || session->visible.empty())
-    return;
-  std::unique_lock lock(mtx);
-  uint32_t max_label_len = 0;
-  uint32_t max_detail_len = 0;
-  uint32_t max_kind_len = 0;
-  for (uint32_t x = session->scroll;
-       x < session->scroll + 8 && x < session->visible.size(); x++) {
-    uint32_t i = session->visible[x];
-    if (i >= session->items.size())
-      continue;
-    auto &item = session->items[i];
-    max_label_len = MAX(max_label_len, (uint32_t)item.label.size());
-    if (item.detail)
-      max_detail_len = MAX(max_detail_len, (uint32_t)item.detail->size());
-    max_kind_len =
-        MAX(max_kind_len, (uint32_t)item_kind_name(item.kind).size());
-  }
-  uint32_t total = session->visible.size();
-  uint32_t rows = MIN(total, 8);
-  size.row = rows + 2;
-  size.col = 2 + 2 + max_label_len + 1 + max_detail_len + 2 + max_kind_len + 1;
-  cells.assign(size.row * size.col, {" ", 0, 0, 0, 0, 0});
-  auto set = [&](uint32_t r, uint32_t c, const char *text, uint32_t fg,
-                 uint32_t bg, uint8_t flags) {
-    if (r < size.row && c < size.col)
-      cells[r * size.col + c] = {std::string(text), 0, fg, bg, flags, 0};
-  };
-  uint32_t border_fg = 0x82AAFF;
-  uint32_t sel_bg = 0x174225;
-  set(0, 0, "┌", border_fg, 0, 0);
-  for (uint32_t c = 1; c < size.col - 1; c++)
-    set(0, c, "─", border_fg, 0, 0);
-  set(0, size.col - 1, "┐", border_fg, 0, 0);
-  uint32_t start = session->scroll;
-  uint32_t end = MIN(start + 8, session->visible.size());
-  for (uint32_t row_idx = start; row_idx < end; row_idx++) {
-    uint32_t r = (row_idx - start) + 1;
-    auto &item = session->items[session->visible[row_idx]];
-    uint32_t bg = (session->visible[row_idx] == session->select) ? sel_bg : 1;
-    uint32_t fg = 0xFFFFFF;
-    set(r, 0, "│", border_fg, 0, 0);
-    uint32_t c = 1;
-    const char *sym = item_symbol(item.kind);
-    set(r, c++, sym, kind_color(item.kind), bg, 0);
-    set(r, c++, " ", fg, bg, 0);
-    for (size_t i = 0; i < item.label.size(); i++)
-      set(r, c + i, (char[2]){item.label[i], 0}, fg, bg,
-          item.deprecated ? CF_STRIKETHROUGH : 0);
-    c += item.label.size();
-    set(r, c++, " ", fg, bg, 0);
-    uint32_t detail_fg = 0xAAAAAA;
-    if (item.detail) {
-      for (size_t i = 0; i < item.detail->size(); i++)
-        set(r, c + i, (char[2]){(*item.detail)[i], 0}, detail_fg, bg, 0);
-      c += item.detail->size();
-    }
-    uint32_t pad = size.col - 1 - c - max_kind_len;
-    for (uint32_t i = 0; i < pad; i++)
-      set(r, c + i, " ", fg, bg, 0);
-    c += pad;
-    std::string kind_name = item_kind_name(item.kind);
-    for (size_t i = 0; i < kind_name.size(); i++)
-      set(r, c + i, (char[2]){kind_name[i], 0}, kind_color(item.kind), bg, 0);
-    set(r, size.col - 1, "│", border_fg, 0, 0);
-  }
-  uint32_t bottom = size.row - 1;
-  set(bottom, 0, "└", border_fg, 0, 0);
-  for (uint32_t c = 1; c < size.col - 1; c++)
-    set(bottom, c, "─", border_fg, 0, 0);
-  set(bottom, size.col - 1, "┘", border_fg, 0, 0);
-  if (session->visible.size() > 8) {
-    std::string info = std::to_string(start + 1) + "-" + std::to_string(end) +
-                       "/" + std::to_string(session->visible.size());
-    for (size_t i = 0; i < info.size() && i < size.col - 2; i++)
-      set(bottom, 1 + i, (char[2]){info[i], 0}, border_fg, 0, 0);
-  }
-}
-
-void CompletionBox::render(Coord pos) {
-  if (hidden || session->visible.empty())
-    return;
-  std::shared_lock lock(mtx);
-  int32_t start_row = (int32_t)pos.row - (int32_t)size.row;
-  if (start_row < 0)
-    start_row = pos.row + 1;
-  int32_t start_col = pos.col;
-  Coord screen_size = get_size();
-  if (start_col + size.col > screen_size.col) {
-    start_col = screen_size.col - size.col;
-    if (start_col < 0)
-      start_col = 0;
-  }
-  position = {(uint32_t)start_row, (uint32_t)start_col};
-  for (uint32_t r = 0; r < size.row; r++)
-    for (uint32_t c = 0; c < size.col; c++)
-      update(start_row + r, start_col + c, cells[r * size.col + c].utf8,
-             cells[r * size.col + c].fg, cells[r * size.col + c].bg,
-             cells[r * size.col + c].flags);
-  if (session->items.size() > session->select &&
-      session->items[session->select].documentation &&
-      *session->items[session->select].documentation != "" &&
-      !session->hover_dirty) {
-    if (session->doc != session->select) {
-      session->doc = session->select;
-      session->hover.clear();
-      session->hover.text = *session->items[session->select].documentation;
-      session->hover.is_markup = true;
-      session->hover_dirty = true;
-    } else {
-      if ((int32_t)position.col - (int32_t)session->hover.size.col > 0) {
-        session->hover.render({position.row + session->hover.size.row,
-                               position.col - session->hover.size.col});
-      } else {
-        session->hover.render(
-            {position.row + session->hover.size.row, position.col + size.col});
-      }
-    }
-  }
-}
+// #include "ui/completionbox.h"
+// #include "editor/completions.h"
+// #include "io/sysio.h"
+// #include "utils/utils.h"
+//
+// std::string item_kind_name(uint8_t kind) {
+//   switch (kind) {
+//   case 1:
+//     return "Text";
+//   case 2:
+//     return "Method";
+//   case 3:
+//     return "Function";
+//   case 4:
+//     return "Constructor";
+//   case 5:
+//     return "Field";
+//   case 6:
+//     return "Variable";
+//   case 7:
+//     return "Class";
+//   case 8:
+//     return "Interface";
+//   case 9:
+//     return "Module";
+//   case 10:
+//     return "Property";
+//   case 11:
+//     return "Unit";
+//   case 12:
+//     return "Value";
+//   case 13:
+//     return "Enum";
+//   case 14:
+//     return "Keyword";
+//   case 15:
+//     return "Snippet";
+//   case 16:
+//     return "Color";
+//   case 17:
+//     return "File";
+//   case 18:
+//     return "Reference";
+//   case 19:
+//     return "Folder";
+//   case 20:
+//     return "EnumMember";
+//   case 21:
+//     return "Constant";
+//   case 22:
+//     return "Struct";
+//   case 23:
+//     return "Event";
+//   case 24:
+//     return "Operator";
+//   case 25:
+//     return "TypeParameter";
+//   default:
+//     return "Unknown";
+//   }
+// }
+//
+// const char *item_symbol(uint8_t kind) { return "●"; }
+//
+// uint32_t kind_color(uint8_t kind) { return 0x82AAFF; }
+//
+// void CompletionBox::render_update() {
+//   if (hidden || session->visible.empty())
+//     return;
+//   std::unique_lock lock(mtx);
+//   uint32_t max_label_len = 0;
+//   uint32_t max_detail_len = 0;
+//   uint32_t max_kind_len = 0;
+//   for (uint32_t x = session->scroll;
+//        x < session->scroll + 8 && x < session->visible.size(); x++) {
+//     uint32_t i = session->visible[x];
+//     if (i >= session->items.size())
+//       continue;
+//     auto &item = session->items[i];
+//     max_label_len = MAX(max_label_len, (uint32_t)item.label.size());
+//     if (item.detail)
+//       max_detail_len = MAX(max_detail_len, (uint32_t)item.detail->size());
+//     max_kind_len =
+//         MAX(max_kind_len, (uint32_t)item_kind_name(item.kind).size());
+//   }
+//   uint32_t total = session->visible.size();
+//   uint32_t rows = MIN(total, 8);
+//   size.row = rows + 2;
+//   size.col = 2 + 2 + max_label_len + 1 + max_detail_len + 2 + max_kind_len +
+//   1; cells.assign(size.row * size.col, {" ", 0, 0, 0, 0, 0}); auto set =
+//   [&](uint32_t r, uint32_t c, const char *text, uint32_t fg,
+//                  uint32_t bg, uint8_t flags) {
+//     if (r < size.row && c < size.col)
+//       cells[r * size.col + c] = {std::string(text), 0, fg, bg, flags, 0};
+//   };
+//   uint32_t border_fg = 0x82AAFF;
+//   uint32_t sel_bg = 0x174225;
+//   set(0, 0, "┌", border_fg, 0, 0);
+//   for (uint32_t c = 1; c < size.col - 1; c++)
+//     set(0, c, "─", border_fg, 0, 0);
+//   set(0, size.col - 1, "┐", border_fg, 0, 0);
+//   uint32_t start = session->scroll;
+//   uint32_t end = MIN(start + 8, session->visible.size());
+//   for (uint32_t row_idx = start; row_idx < end; row_idx++) {
+//     uint32_t r = (row_idx - start) + 1;
+//     auto &item = session->items[session->visible[row_idx]];
+//     uint32_t bg = (session->visible[row_idx] == session->select) ? sel_bg :
+//     1; uint32_t fg = 0xFFFFFF; set(r, 0, "│", border_fg, 0, 0); uint32_t c =
+//     1; const char *sym = item_symbol(item.kind); set(r, c++, sym,
+//     kind_color(item.kind), bg, 0); set(r, c++, " ", fg, bg, 0); for (size_t i
+//     = 0; i < item.label.size(); i++)
+//       set(r, c + i, (char[2]){item.label[i], 0}, fg, bg,
+//           item.deprecated ? CF_STRIKETHROUGH : 0);
+//     c += item.label.size();
+//     set(r, c++, " ", fg, bg, 0);
+//     uint32_t detail_fg = 0xAAAAAA;
+//     if (item.detail) {
+//       for (size_t i = 0; i < item.detail->size(); i++)
+//         set(r, c + i, (char[2]){(*item.detail)[i], 0}, detail_fg, bg, 0);
+//       c += item.detail->size();
+//     }
+//     uint32_t pad = size.col - 1 - c - max_kind_len;
+//     for (uint32_t i = 0; i < pad; i++)
+//       set(r, c + i, " ", fg, bg, 0);
+//     c += pad;
+//     std::string kind_name = item_kind_name(item.kind);
+//     for (size_t i = 0; i < kind_name.size(); i++)
+//       set(r, c + i, (char[2]){kind_name[i], 0}, kind_color(item.kind), bg,
+//       0);
+//     set(r, size.col - 1, "│", border_fg, 0, 0);
+//   }
+//   uint32_t bottom = size.row - 1;
+//   set(bottom, 0, "└", border_fg, 0, 0);
+//   for (uint32_t c = 1; c < size.col - 1; c++)
+//     set(bottom, c, "─", border_fg, 0, 0);
+//   set(bottom, size.col - 1, "┘", border_fg, 0, 0);
+//   if (session->visible.size() > 8) {
+//     std::string info = std::to_string(start + 1) + "-" + std::to_string(end)
+//     +
+//                        "/" + std::to_string(session->visible.size());
+//     for (size_t i = 0; i < info.size() && i < size.col - 2; i++)
+//       set(bottom, 1 + i, (char[2]){info[i], 0}, border_fg, 0, 0);
+//   }
+// }
+//
+// void CompletionBox::render(Coord pos) {
+//   if (hidden || session->visible.empty())
+//     return;
+//   std::shared_lock lock(mtx);
+//   int32_t start_row = (int32_t)pos.row - (int32_t)size.row;
+//   if (start_row < 0)
+//     start_row = pos.row + 1;
+//   int32_t start_col = pos.col;
+//   Coord screen_size = get_size();
+//   if (start_col + size.col > screen_size.col) {
+//     start_col = screen_size.col - size.col;
+//     if (start_col < 0)
+//       start_col = 0;
+//   }
+//   position = {(uint32_t)start_row, (uint32_t)start_col};
+//   for (uint32_t r = 0; r < size.row; r++)
+//     for (uint32_t c = 0; c < size.col; c++)
+//       update(start_row + r, start_col + c, cells[r * size.col + c].utf8,
+//              cells[r * size.col + c].fg, cells[r * size.col + c].bg,
+//              cells[r * size.col + c].flags);
+//   if (session->items.size() > session->select &&
+//       session->items[session->select].documentation &&
+//       *session->items[session->select].documentation != "" &&
+//       !session->hover_dirty) {
+//     if (session->doc != session->select) {
+//       session->doc = session->select;
+//       session->hover.clear();
+//       session->hover.text = *session->items[session->select].documentation;
+//       session->hover.is_markup = true;
+//       session->hover_dirty = true;
+//     } else {
+//       if ((int32_t)position.col - (int32_t)session->hover.size.col > 0) {
+//         session->hover.render({position.row + session->hover.size.row,
+//                                position.col - session->hover.size.col});
+//       } else {
+//         session->hover.render(
+//             {position.row + session->hover.size.row, position.col +
+//             size.col});
+//       }
+//     }
+//   }
+// }
diff --git a/src/ui/diagnostics.cc b/src/ui/diagnostics.cc
index ad54561..ae98033 100644
--- a/src/ui/diagnostics.cc
+++ b/src/ui/diagnostics.cc
@@ -1,162 +1,164 @@
-#include "ui/diagnostics.h"
-
-void DiagnosticBox::clear() {
-  warnings.clear();
-  cells.clear();
-  size = {0, 0};
-};
-
-void DiagnosticBox::render_first() {
-  if (warnings.empty())
-    return;
-  uint32_t longest_line = 8 + warnings[0].source.length();
-  for (auto &warn : warnings) {
-    uint32_t longest = 0;
-    uint32_t cur = 0;
-    for (char ch : warn.text_full)
-      if (ch == '\n') {
-        longest = MAX(longest, cur);
-        cur = 0;
-      } else {
-        if (ch == '\t')
-          cur += 3;
-        ++cur;
-      }
-    longest = MAX(longest, cur);
-    longest_line = MAX(longest_line, longest + 7);
-    longest_line = MAX(longest_line, (uint32_t)warn.code.length() + 4);
-    for (auto &see_also : warn.see_also)
-      longest_line = MAX(longest_line, (uint32_t)see_also.length() + 4);
-  }
-  uint32_t content_width = MIN(longest_line, 150u);
-  size.col = content_width + 2;
-  cells.assign(size.col * 25, {" ", 0, 0, 0, 0, 0});
-  auto set = [&](uint32_t r, uint32_t c, const char *text, uint32_t fg,
-                 uint32_t bg, uint8_t flags) {
-    cells[r * size.col + c] = {std::string(text), 0, fg, bg, flags, 0};
-  };
-  uint32_t base_bg = 0;
-  uint32_t border_fg = 0x82AAFF;
-  uint32_t r = 0;
-  if (warnings[0].source != "") {
-    std::string src_txt = "Source: ";
-    for (uint32_t i = 0; i < src_txt.length() && i < content_width; i++)
-      set(1, i + 1, (char[2]){src_txt[i], 0}, 0x3EAAFF, base_bg, 0);
-    for (uint32_t i = 0; i < warnings[0].source.length() && i < content_width;
-         i++)
-      set(1, i + 1 + src_txt.length(), (char[2]){warnings[0].source[i], 0},
-          0xffffff, base_bg, 0);
-    r++;
-  }
-  int idx = 1;
-  for (auto &warn : warnings) {
-    char buf[4];
-    std::snprintf(buf, sizeof(buf), "%2d", idx % 100);
-    std::string line_txt = std::string(buf) + ". ";
-    for (uint32_t i = 0; i < line_txt.length(); i++)
-      set(r + 1, i + 1, (char[2]){line_txt[i], 0}, 0xffffff, base_bg, 0);
-    if (r >= 23)
-      break;
-    const char *err_sym = "";
-    uint32_t c_sym = 0xAAAAAA;
-    switch (warn.type) {
-    case 1:
-      err_sym = "";
-      c_sym = 0xFF0000;
-      break;
-    case 2:
-      err_sym = "";
-      c_sym = 0xFFFF00;
-      break;
-    case 3:
-      err_sym = "";
-      c_sym = 0xFF00FF;
-      break;
-    case 4:
-      err_sym = "";
-      c_sym = 0xAAAAAA;
-      break;
-    }
-    std::string text = warn.text_full + " " + err_sym;
-    uint32_t i = 0;
-    while (i < text.length() && r < 23) {
-      uint32_t c = 4;
-      while (c < content_width && i < text.length()) {
-        if (text[i] == '\n') {
-          while (i < text.length() && text[i] == '\n')
-            i++;
-          break;
-        }
-        uint32_t cluster_len = grapheme_next_character_break_utf8(
-            text.c_str() + i, text.length() - i);
-        std::string cluster = text.substr(i, cluster_len);
-        int width = display_width(cluster.c_str(), cluster_len);
-        if (c + width > content_width)
-          break;
-        set(r + 1, c + 1, cluster.c_str(), c_sym, base_bg, 0);
-        c += width;
-        i += cluster_len;
-        for (int w = 1; w < width; w++)
-          set(r + 1, c - w + 1, "\x1b", c_sym, base_bg, 0);
-      }
-      r++;
-    }
-    if (r >= 23)
-      break;
-    if (warn.code != "") {
-      for (uint32_t i = 0; i < warn.code.length() && i + 5 < content_width; i++)
-        set(r + 1, i + 5, (char[2]){warn.code[i], 0}, 0x81cdc6, base_bg, 0);
-      r++;
-    }
-    if (r >= 23)
-      break;
-    for (std::string &see_also : warn.see_also) {
-      uint32_t fg = 0xB55EFF;
-      uint8_t colon_count = 0;
-      for (uint32_t i = 0; i < see_also.length() && i + 5 < content_width;
-           i++) {
-        set(r + 1, i + 5, (char[2]){see_also[i], 0}, fg, base_bg, 0);
-        if (see_also[i] == ':')
-          colon_count++;
-        if (colon_count == 2)
-          fg = 0xFFFFFF;
-      }
-      r++;
-      if (r >= 23)
-        break;
-    };
-    idx++;
-  }
-  size.row = 2 + r;
-  set(0, 0, "┌", border_fg, base_bg, 0);
-  for (uint32_t i = 1; i < size.col - 1; i++)
-    set(0, i, "─", border_fg, base_bg, 0);
-  set(0, size.col - 1, "┐", border_fg, base_bg, 0);
-  for (uint32_t r = 1; r < size.row - 1; r++) {
-    set(r, 0, "│", border_fg, base_bg, 0);
-    set(r, size.col - 1, "│", border_fg, base_bg, 0);
-  }
-  set(size.row - 1, 0, "└", border_fg, base_bg, 0);
-  for (uint32_t i = 1; i < size.col - 1; i++)
-    set(size.row - 1, i, "─", border_fg, base_bg, 0);
-  set(size.row - 1, size.col - 1, "┘", border_fg, base_bg, 0);
-  cells.resize(size.col * size.row);
-}
-
-void DiagnosticBox::render(Coord pos) {
-  int32_t start_row = (int32_t)pos.row - (int32_t)size.row;
-  if (start_row < 0)
-    start_row = pos.row + 1;
-  int32_t start_col = pos.col;
-  Coord screen_size = get_size();
-  if (start_col + size.col > screen_size.col) {
-    start_col = screen_size.col - size.col;
-    if (start_col < 0)
-      start_col = 0;
-  }
-  for (uint32_t r = 0; r < size.row; r++)
-    for (uint32_t c = 0; c < size.col; c++)
-      update(start_row + r, start_col + c, cells[r * size.col + c].utf8,
-             cells[r * size.col + c].fg, cells[r * size.col + c].bg,
-             cells[r * size.col + c].flags);
-}
+// #include "ui/diagnostics.h"
+//
+// void DiagnosticBox::clear() {
+//   warnings.clear();
+//   cells.clear();
+//   size = {0, 0};
+// };
+//
+// void DiagnosticBox::render_first() {
+//   if (warnings.empty())
+//     return;
+//   uint32_t longest_line = 8 + warnings[0].source.length();
+//   for (auto &warn : warnings) {
+//     uint32_t longest = 0;
+//     uint32_t cur = 0;
+//     for (char ch : warn.text_full)
+//       if (ch == '\n') {
+//         longest = MAX(longest, cur);
+//         cur = 0;
+//       } else {
+//         if (ch == '\t')
+//           cur += 3;
+//         ++cur;
+//       }
+//     longest = MAX(longest, cur);
+//     longest_line = MAX(longest_line, longest + 7);
+//     longest_line = MAX(longest_line, (uint32_t)warn.code.length() + 4);
+//     for (auto &see_also : warn.see_also)
+//       longest_line = MAX(longest_line, (uint32_t)see_also.length() + 4);
+//   }
+//   uint32_t content_width = MIN(longest_line, 150u);
+//   size.col = content_width + 2;
+//   cells.assign(size.col * 25, {" ", 0, 0, 0, 0, 0});
+//   auto set = [&](uint32_t r, uint32_t c, const char *text, uint32_t fg,
+//                  uint32_t bg, uint8_t flags) {
+//     cells[r * size.col + c] = {std::string(text), 0, fg, bg, flags, 0};
+//   };
+//   uint32_t base_bg = 0;
+//   uint32_t border_fg = 0x82AAFF;
+//   uint32_t r = 0;
+//   if (warnings[0].source != "") {
+//     std::string src_txt = "Source: ";
+//     for (uint32_t i = 0; i < src_txt.length() && i < content_width; i++)
+//       set(1, i + 1, (char[2]){src_txt[i], 0}, 0x3EAAFF, base_bg, 0);
+//     for (uint32_t i = 0; i < warnings[0].source.length() && i <
+//     content_width;
+//          i++)
+//       set(1, i + 1 + src_txt.length(), (char[2]){warnings[0].source[i], 0},
+//           0xffffff, base_bg, 0);
+//     r++;
+//   }
+//   int idx = 1;
+//   for (auto &warn : warnings) {
+//     char buf[4];
+//     std::snprintf(buf, sizeof(buf), "%2d", idx % 100);
+//     std::string line_txt = std::string(buf) + ". ";
+//     for (uint32_t i = 0; i < line_txt.length(); i++)
+//       set(r + 1, i + 1, (char[2]){line_txt[i], 0}, 0xffffff, base_bg, 0);
+//     if (r >= 23)
+//       break;
+//     const char *err_sym = "";
+//     uint32_t c_sym = 0xAAAAAA;
+//     switch (warn.type) {
+//     case 1:
+//       err_sym = "";
+//       c_sym = 0xFF0000;
+//       break;
+//     case 2:
+//       err_sym = "";
+//       c_sym = 0xFFFF00;
+//       break;
+//     case 3:
+//       err_sym = "";
+//       c_sym = 0xFF00FF;
+//       break;
+//     case 4:
+//       err_sym = "";
+//       c_sym = 0xAAAAAA;
+//       break;
+//     }
+//     std::string text = warn.text_full + " " + err_sym;
+//     uint32_t i = 0;
+//     while (i < text.length() && r < 23) {
+//       uint32_t c = 4;
+//       while (c < content_width && i < text.length()) {
+//         if (text[i] == '\n') {
+//           while (i < text.length() && text[i] == '\n')
+//             i++;
+//           break;
+//         }
+//         uint32_t cluster_len = grapheme_next_character_break_utf8(
+//             text.c_str() + i, text.length() - i);
+//         std::string cluster = text.substr(i, cluster_len);
+//         int width = display_width(cluster.c_str(), cluster_len);
+//         if (c + width > content_width)
+//           break;
+//         set(r + 1, c + 1, cluster.c_str(), c_sym, base_bg, 0);
+//         c += width;
+//         i += cluster_len;
+//         for (int w = 1; w < width; w++)
+//           set(r + 1, c - w + 1, "\x1b", c_sym, base_bg, 0);
+//       }
+//       r++;
+//     }
+//     if (r >= 23)
+//       break;
+//     if (warn.code != "") {
+//       for (uint32_t i = 0; i < warn.code.length() && i + 5 < content_width;
+//       i++)
+//         set(r + 1, i + 5, (char[2]){warn.code[i], 0}, 0x81cdc6, base_bg, 0);
+//       r++;
+//     }
+//     if (r >= 23)
+//       break;
+//     for (std::string &see_also : warn.see_also) {
+//       uint32_t fg = 0xB55EFF;
+//       uint8_t colon_count = 0;
+//       for (uint32_t i = 0; i < see_also.length() && i + 5 < content_width;
+//            i++) {
+//         set(r + 1, i + 5, (char[2]){see_also[i], 0}, fg, base_bg, 0);
+//         if (see_also[i] == ':')
+//           colon_count++;
+//         if (colon_count == 2)
+//           fg = 0xFFFFFF;
+//       }
+//       r++;
+//       if (r >= 23)
+//         break;
+//     };
+//     idx++;
+//   }
+//   size.row = 2 + r;
+//   set(0, 0, "┌", border_fg, base_bg, 0);
+//   for (uint32_t i = 1; i < size.col - 1; i++)
+//     set(0, i, "─", border_fg, base_bg, 0);
+//   set(0, size.col - 1, "┐", border_fg, base_bg, 0);
+//   for (uint32_t r = 1; r < size.row - 1; r++) {
+//     set(r, 0, "│", border_fg, base_bg, 0);
+//     set(r, size.col - 1, "│", border_fg, base_bg, 0);
+//   }
+//   set(size.row - 1, 0, "└", border_fg, base_bg, 0);
+//   for (uint32_t i = 1; i < size.col - 1; i++)
+//     set(size.row - 1, i, "─", border_fg, base_bg, 0);
+//   set(size.row - 1, size.col - 1, "┘", border_fg, base_bg, 0);
+//   cells.resize(size.col * size.row);
+// }
+//
+// void DiagnosticBox::render(Coord pos) {
+//   int32_t start_row = (int32_t)pos.row - (int32_t)size.row;
+//   if (start_row < 0)
+//     start_row = pos.row + 1;
+//   int32_t start_col = pos.col;
+//   Coord screen_size = get_size();
+//   if (start_col + size.col > screen_size.col) {
+//     start_col = screen_size.col - size.col;
+//     if (start_col < 0)
+//       start_col = 0;
+//   }
+//   for (uint32_t r = 0; r < size.row; r++)
+//     for (uint32_t c = 0; c < size.col; c++)
+//       update(start_row + r, start_col + c, cells[r * size.col + c].utf8,
+//              cells[r * size.col + c].fg, cells[r * size.col + c].bg,
+//              cells[r * size.col + c].flags);
+// }
diff --git a/src/windows/renderer.cc b/src/windows/renderer.cc
new file mode 100644
index 0000000..bed82e8
--- /dev/null
+++ b/src/windows/renderer.cc
@@ -0,0 +1,23 @@
+#include "main.h"
+#include "windows/decl.h"
+
+TileRoot root_tile;
+std::vector<std::unique_ptr<TileRoot>> popups;
+Window *focused_window;
+
+void render() {
+  ui::bar.render(new_screen);
+  root_tile.render(new_screen);
+  for (auto &popup : popups)
+    popup->render(new_screen);
+}
+
+void handle_click(KeyEvent event) {
+  for (auto &popup : popups) {
+    if (popup->inside(event.mouse_x, event.mouse_y)) {
+      popup->handle_click(event);
+      return;
+    }
+  }
+  root_tile.handle_click(event);
+}