Cleanup

- switched to a sparse delta based map
- true lazy-loading to avoid any unneccessary allocations
- fixed windows management api

README.md

@@ -21,7 +21,7 @@ curl https://syedm.dev/crib | sh
 ```
 
 Currently only for Linux.<br>
-*Tested with arch linux and ubuntu and void*<br>
+*Tested with arch linux, ubuntu and void*<br>
 
 ## Building
 
@@ -134,6 +134,7 @@ crib ./filename.ext
 ```
 
 *If `filename.ext` does not exist, it will be created*<br>
+*memory usage is average case 10MB + 2x size of file*<br>
 
 ## Keybindings
 

TODO.md

@@ -2,48 +2,52 @@ Copyright 2025 Syed Daanish
 
 # TODO
 
-# memory usage for debug build (release build will be smaller by about 25%)
-```
-8K   ->    13.2M
-128K ->    13.2M (expected worst case 16.6M)
-128M ->   412.0M (expected worst case 2.3G)
-```
-
-## Next few super long boring things to do::
-* redo lsp threads such that no mutex needed for any rope stuff (done)
-    - Also make the classes own the methods in lsp (done)
-    - This will mean that parsers/renderers and keystrokes will not need to be individually locked (done)
-    - And so it will be much faster (done)
-    - 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) (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
-            - Thick and thin mode
-                - thin mode only shares screen diffing over the network - uses server settings / themes
-                - thick only shared fileio and lsp data with local used for all else - uses local settings / themes
-    - 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
-    - which is reused by scrollers/ensurers too
-    - this will then allow inlay hints to be possible
-    - and also make VAI easier to implement
+- And factorize renderer into its own class
+    - which is just managed by the renderer
+    - and adjusment.cc will call it
+- which is reused by scrollers/ensurers too (for knowing screen wrapped end)
+- this will then allow inlay hints to be possible
+- and also make VAI easier to implement
 * Allow keybinds to be set in ruby
 
-* then the fun part:
+* ruby file for project specific runs alongside any system wide ones
+
+- 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 libssh2 or child process stuff for remote editing (remote mode)
+    - Thick and thin mode (server mode) (through ssh or port) (for website only port + webhook)
+        - thin mode only shares screen diffing over the network - uses server settings / themes / shell
+            - only one user connects at a time
+            - provides data as a websocket with tui or gui/online modes where tui shares diffing as is (can be connected to by gui or website)
+            - and gui/online modes try to (if not then render onto a canvas) forward window.render_gui() and dedicated windowing system (i.e windowing is html divs)
+            - and window.render_gui() returns a markup code (custom markup)
+                - and for events i could either leave tui as-is and for markup have special event handling or i
+                - implement the widget system in both and have the same event handling then
+            - actually for true cross platform i need to make a ui lib with widgets etc. so it is workable on all platforms (so they all need only a single ui lib)
+        - thick only shared fileio and lsp data with local used for all else - uses local settings / themes
+            - multiple users connect at once but maybe either make them not be allowed to open same file or make vscode like multiediting (unsure how exactly)
+            - they all share same lsp instances
+            - they all have the same shell access
+        - allow having an instance that forwards thick mode to thin mode (to connect online mode to a thick server for code collaboration)
 * Then allow ruby code to create and handle windows as extentions
 * Then 3 inbuilt extentions being file manager, theme picker, tab selector
 
+* make another tile type called tile tabbed that has a tab switcher and shows only one of its children at once
+* it takes focus and takes some keybinds for switching and forwards the rest (it also forwards the info and adds one for itself - the selected/total tabs)
+* also implement info strings for all the stuff that take focus
+
+* Mode is a feild on a editor and there is no global "mode system" except in editors (enxtentions do their own thing)
+    * make mode normal and not atomic if it is truly unused across threads
+    * this means keybinds can be set to use the editor as insert mode only and so behave like vscode
+
+* split lsp stuff into multiple files (not a monolithic class as it is now)
 * Extentions can also be used as file openers (for like databases . diffing . images . audio etc)
 * Local cache for state management (like undo history, cursor positions etc) (location can be set in config)
 * make sure to write inbuilt extentions in cpp and not ruby
 * also move default bar and clipboard back into cpp
 * all lsp popups are no longer their own classes but instead windows (extention like) in popup mode
 
+* also **fix click handling to send mouse unclick to the same focus window as the click And also for drag to be same as the starter**
 * skip opening binary files
 * apply themeing in bg log bar lsp popus etc. to keep visual consistency
 * searching/replace/Multi-Cursor (for just one lsp command for all) with pcre2 with regex (started by a slash) (disabled for large files)
@@ -116,8 +120,6 @@ Copyright 2025 Syed Daanish
 
 * [ ] **Auto brace selection:** Add support for auto brace selection.
 
-* [ ] **Tree-sitter Indent:** Attempt to allow Tree-sitter to handle indentation if possible.
-
 ### UX
 
 * [ ] **Completion Filtering:**
@@ -126,7 +128,7 @@ Copyright 2025 Syed Daanish
 
 * [ ] **Basic Autocomplete:** Keep a list of words in the current buffer for non-LSP fallback.
 
-### Major Features
+### Features
 
 * [ ] **Search & Replace:**
     * [ ] Add Search/Replace UI.
@@ -160,3 +162,14 @@ Copyright 2025 Syed Daanish
     * [ ] Switch JSON parser to `RapidJSON` (or similar high-performance lib).
     * [ ] Decrease usage of `std::string` in UI, LSP, warnings etc.
     * [ ] Also for vectors into managed memory especially for completions/lsp-stuff.
+
+
+
+
+<!-- The pits of hell: -->
+<!-- * Replace perfectly working superfast rope with a structure that stores for small files everything -->
+<!--     - but for large ones it stores only what the user viewed / edited (by line number) -->
+<!--     - the rest is from the disk and not entirely loaded into memory (keep as option maybe they want everything in memory?) -->
+<!--     - also for the line mode still go through entire file to get and store line offsets -->
+<!--     - also it stores everything prolly still as rope tho (rope of lines) (or sparse map) -->
+<!--     - it stores the line text as-is which is only unicode / crlf normalized during usage -->

include/editor/editor.h

@@ -1,12 +1,15 @@
 #ifndef EDITOR_H
 #define EDITOR_H
 
+#include "editor/hooks.h"
 #include "editor/indents.h"
+#include "editor/visual.h"
+#include "extentions/diagnostics.h"
+#include "extentions/hover.h"
 #include "io/knot.h"
 #include "io/sysio.h"
 #include "syntax/extras.h"
 #include "syntax/parser.h"
-#include "ui/diagnostics.h"
 #include "utils/utils.h"
 #include "windows/decl.h"
 
@@ -30,17 +33,17 @@ struct Editor : Window {
   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::atomic<struct LSPInstance *> lsp = nullptr;
-  bool hover_active = false;
-  bool diagnostics_active = false;
+  HoverBox *hover_popup = init_hover();
+  DiagnosticBox *diagnostic_popup = init_diagnostic();
   std::atomic<int> lsp_version = 1;
   IndentationEngine indents = {};
+  HookEngine hooks = {};
   Parser *parser = nullptr;
   ExtraHighlighter extra_hl = {};
   bool is_css_color = false;
@@ -83,7 +86,6 @@ struct Editor : Window {
   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();
@@ -157,19 +159,6 @@ struct Editor : Window {
     free(it->buffer);
     free(it);
   }
-
-  inline void apply_hook_insertion(uint32_t line, uint32_t rows) {
-    for (auto &hook : this->hooks)
-      if (hook > line)
-        hook += rows;
-  }
-
-  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

include/editor/hooks.h

@@ -0,0 +1,91 @@
+#ifndef EDITOR_HOOKS_H
+#define EDITOR_HOOKS_H
+
+#include "utils/utils.h"
+
+struct HookEngine {
+  uint32_t hooks[94];
+  std::vector<std::pair<uint32_t, char>> v;
+  std::vector<std::pair<uint32_t, char>>::iterator it;
+
+  HookEngine() {
+    for (int i = 0; i < 94; i++)
+      hooks[i] = UINT32_MAX;
+    v.reserve(94);
+  }
+
+  inline void edit(uint32_t line, uint32_t removed_rows,
+                   uint32_t inserted_rows) {
+
+    int64_t delta = (int64_t)inserted_rows - (int64_t)removed_rows;
+    for (int i = 0; i < 94; i++) {
+      uint32_t &h = hooks[i];
+      if (h == UINT32_MAX)
+        continue;
+      if (h < line)
+        continue;
+      if (removed_rows > 0 && h < line + removed_rows) {
+        h = UINT32_MAX;
+        continue;
+      }
+      h = (uint32_t)((int64_t)h + delta);
+    }
+  }
+
+  inline void set(char c, uint32_t line) {
+    if (c < '!' || c > '~')
+      return;
+    int idx = c - '!';
+    for (int i = 0; i < 94; i++) {
+      if (hooks[i] == line) {
+        hooks[i] = UINT32_MAX;
+        break;
+      }
+    }
+    hooks[idx] = line;
+  }
+
+  inline bool get(char c, uint32_t *out_line) const {
+    if (c < '!' || c > '~')
+      return false;
+    uint32_t h = hooks[c - '!'];
+    if (h == UINT32_MAX)
+      return false;
+    *out_line = h;
+    return true;
+  }
+
+  inline void clear_line(uint32_t line) {
+    for (int i = 0; i < 94; i++)
+      if (hooks[i] == line)
+        hooks[i] = UINT32_MAX;
+  }
+
+  inline void clear(char c) {
+    if (c < '!' || c > '~')
+      return;
+    hooks[c - '!'] = UINT32_MAX;
+  }
+
+  void start_iter(uint32_t scroll_line) {
+    for (int i = 0; i < 94; i++)
+      if (hooks[i] != UINT32_MAX)
+        v.push_back({hooks[i], (char)('!' + i)});
+    std::sort(v.begin(), v.end(),
+              [](const auto &a, const auto &b) { return a.first < b.first; });
+    it = std::lower_bound(
+        v.begin(), v.end(), scroll_line,
+        [](const auto &p, uint32_t line) { return p.first < line; });
+  }
+
+  char next(uint32_t line_index) {
+    if (it != v.end() && it->first == line_index) {
+      char c = it->second;
+      it++;
+      return c;
+    }
+    return '\0';
+  }
+};
+
+#endif

include/editor/visual.h

@@ -0,0 +1,113 @@
+#include "editor/decl.h"
+#include "io/knot.h"
+#include "io/sysio.h"
+#include "utils/utils.h"
+
+struct GraphemeIterator {
+  char *line{nullptr};
+  uint32_t len{0};
+
+  GraphemeIterator(char *line, uint32_t len) : line(line), len(len) {}
+
+  char *next(uint32_t *o_len, uint32_t *o_width) {
+    if (!line || len == 0)
+      return nullptr;
+    char *cur = line;
+    uint32_t g = grapheme_next_character_break_utf8(cur, len);
+    if (o_width)
+      *o_width = display_width(cur, g);
+    if (o_len)
+      *o_len = g;
+    line += g;
+    len -= g;
+    return cur;
+  }
+};
+
+struct VisualIterator {
+  LineIterator *it{nullptr};
+  uint32_t line_index{UINT32_MAX};
+  uint32_t offset{0};
+  uint32_t len{0};
+  bool first{true};
+  char *line{nullptr};
+  uint32_t render_width{io::cols};
+  std::stack<std::pair<Coord, Coord>> prev_stack;
+
+  VisualIterator(Knot *root, Coord pos, uint32_t width)
+      : it(begin_l_iter(root, pos.row)), line_index(pos.row - 1),
+        offset(pos.col), render_width(width) {}
+
+  std::pair<Coord, Coord> prev() {
+    if (!it)
+      return {{UINT32_MAX, UINT32_MAX}, {UINT32_MAX, UINT32_MAX}};
+    if (prev_stack.empty())
+      return _prev();
+    auto ret = prev_stack.top();
+    offset = ret.first.col;
+    prev_stack.pop();
+    return ret;
+  }
+
+  std::pair<Coord, Coord> _prev() {
+    if (!it)
+      return {{UINT32_MAX, UINT32_MAX}, {UINT32_MAX, UINT32_MAX}};
+    line_index--;
+    line = prev_line(it, &len);
+    if (!line)
+      return {{UINT32_MAX, UINT32_MAX}, {UINT32_MAX, UINT32_MAX}};
+    if (len > 0 && line[len - 1] == '\n')
+      len--;
+    offset = first ? offset : 0;
+    first = false;
+    GraphemeIterator g(line + offset, len - offset);
+    uint32_t o_len, o_width, rendered = 0, advance = 0;
+    while (g.next(&o_len, &o_width)) {
+      if (rendered + o_width > render_width) {
+        prev_stack.push({{line_index, offset}, {line_index, offset + advance}});
+        offset += advance;
+        rendered = 0;
+        advance = 0;
+      }
+      advance += o_len;
+      rendered += o_width;
+    }
+    return {{line_index, offset}, {line_index, offset + advance}};
+  }
+
+  std::pair<Coord, Coord> next() {
+    if (!it)
+      return {{UINT32_MAX, UINT32_MAX}, {UINT32_MAX, UINT32_MAX}};
+    if (!line) {
+      line_index++;
+      line = next_line(it, &len);
+      if (!line)
+        return {{UINT32_MAX, UINT32_MAX}, {UINT32_MAX, UINT32_MAX}};
+      if (len > 0 && line[len - 1] == '\n')
+        len--;
+      offset = first ? offset : 0;
+      first = false;
+    }
+    GraphemeIterator g(line + offset, len - offset);
+    uint32_t o_len, o_width, rendered = 0, advance = 0;
+    while (g.next(&o_len, &o_width)) {
+      if (rendered + o_width > render_width) {
+        offset += advance;
+        return {{line_index, offset - advance}, {line_index, offset}};
+      }
+      advance += o_len;
+      rendered += o_width;
+    }
+    offset += advance;
+    if (offset >= len)
+      line = nullptr;
+    return {{line_index, offset}, {line_index, offset + advance}};
+  }
+
+  ~VisualIterator() {
+    if (!it)
+      return;
+    free(it->buffer);
+    free(it);
+  }
+};

include/extentions/diagnostics.h

@@ -0,0 +1,22 @@
+#ifndef EXTENTION_DIAGNOSTICS_H
+#define EXTENTION_DIAGNOSTICS_H
+
+#include "editor/decl.h"
+#include "io/sysio.h"
+#include "pch.h"
+#include "utils/utils.h"
+#include "windows/decl.h"
+
+struct DiagnosticBox : Popup {
+  std::vector<VWarn> warnings;
+
+  DiagnosticBox() { this->hidden = true; }
+  void clear() { this->warnings.clear(); }
+  void render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) override;
+  void handle_click(KeyEvent, Coord) override { this->hidden = true; };
+  ~DiagnosticBox() {};
+};
+
+DiagnosticBox *init_diagnostic();
+
+#endif

include/extentions/hover.h

@@ -6,9 +6,7 @@
 #include "utils/utils.h"
 #include "windows/decl.h"
 
-TileRoot *init_hover();
-
-struct HoverBox : Window {
+struct HoverBox : Popup {
   std::string text;
   std::atomic<bool> is_markup;
   uint32_t scroll_;
@@ -24,8 +22,16 @@ struct HoverBox : Window {
   }
   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; };
+  void handle_click(KeyEvent ev, Coord) override {
+    if (ev.mouse_button == SCROLL_BTN && ev.mouse_state == SCROLL) {
+      this->scroll(ev.mouse_direction == SCROLL_UP ? -1 : 1);
+      return;
+    }
+    this->hidden = true;
+  };
   ~HoverBox() {};
 };
 
+HoverBox *init_hover();
+
 #endif

include/io/sysio.h

@@ -96,14 +96,19 @@ inline bool is_empty_cell(const ScreenCell &c) {
   return c.utf8.empty() || c.utf8 == " " || c.utf8 == "\x1b";
 }
 
+namespace io {
 extern std::vector<ScreenCell> new_screen;
+extern uint32_t rows, cols;
+extern bool show_cursor;
+extern std::vector<ScreenCell> old_screen;
+extern termios orig_termios;
+} // namespace io
 
 Coord start_screen();
 void end_screen();
 void set_cursor(uint8_t row, uint8_t col, uint32_t type,
                 bool show_cursor_param);
 void io_render();
-Coord get_size();
 
 KeyEvent read_key();
 

include/lsp/lsp.h

@@ -2,19 +2,15 @@
 #define LSP_H
 
 #include "editor/editor.h"
+#include "main.h"
 #include "pch.h"
 #include "utils/utils.h"
+#include <cstdint>
+#include <sys/types.h>
 
-#define LSP_TIMEOUT 3000
-
-namespace lsp {
-extern std::mutex lsp_mutex;
-extern std::unordered_map<std::string, std::unique_ptr<LSPInstance>>
-    active_lsps;
-extern Queue<std::string> need_opening;
-extern std::unordered_set<std::string> opened;
-extern std::vector<Editor *> new_editors;
-} // namespace lsp
+#define LSP_TIMEOUT_START 3000
+#define LSP_TIMEOUT_QUIT_NORMAL 300
+#define LSP_TIMEOUT_QUIT_FORCE 80
 
 void lsp_worker();
 
@@ -48,6 +44,16 @@ struct LSPMessage {
   std::function<void(const LSPMessage &)> callback;
 };
 
+namespace lsp {
+extern std::mutex lsp_mutex;
+extern std::unordered_map<std::string, std::unique_ptr<LSPInstance>>
+    active_lsps;
+extern Queue<std::string> need_opening;
+extern std::unordered_set<std::string> opened;
+extern std::vector<Editor *> new_editors;
+extern Queue<std::unique_ptr<LSPMessage>> response_queue;
+} // namespace lsp
+
 struct LSPInstance {
   const LSP *lsp_info;
   std::string root_dir;
@@ -70,7 +76,6 @@ struct LSPInstance {
   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;
 
   LSPInstance(std::string lsp_id) {
@@ -89,7 +94,15 @@ struct LSPInstance {
           {"capabilities", client_capabilities}}}};
     send_raw(initialize_message);
     pollfd pfd{stdout_fd, POLLIN, 0};
-    poll(&pfd, 1, LSP_TIMEOUT);
+    uint32_t waited = 0;
+    while (waited < LSP_TIMEOUT_START) {
+      poll(&pfd, 1, 50);
+      if (pfd.revents & POLLIN)
+        break;
+      if (!running)
+        return;
+      waited += 50;
+    }
     if (!(pfd.revents & POLLIN)) {
       exited = true;
       return;
@@ -116,9 +129,7 @@ struct LSPInstance {
         }
       }
       allow_formatting = caps.value("documentFormattingProvider", false);
-      if (lsp_id != "lua-language-server" /* Lua ls gives terrible ontype
-                                             formatting so disable */
-          && caps.contains("documentOnTypeFormattingProvider")) {
+      if (caps.contains("documentOnTypeFormattingProvider")) {
         auto &fmt = caps["documentOnTypeFormattingProvider"];
         if (fmt.is_object()) {
           if (fmt.contains("firstTriggerCharacter")) {
@@ -181,34 +192,39 @@ struct LSPInstance {
     send_raw(initialized_message);
   }
   ~LSPInstance() {
+    uint32_t timeout =
+        running ? LSP_TIMEOUT_QUIT_NORMAL : LSP_TIMEOUT_QUIT_FORCE;
     for (auto &ed : editors)
       ed->lsp.store(nullptr);
     initialized = false;
     exited = true;
     if (pid == -1)
       return;
-    json shutdown = {{"id", ++last_id}, {"method", "shutdown"}};
+    json shutdown = {
+        {"jsonrpc", "2.0"}, {"id", ++last_id}, {"method", "shutdown"}};
     send_raw(shutdown);
     pollfd pfd{stdout_fd, POLLIN, 0};
-    poll(&pfd, 1, 500);
-    json exit_msg = {{"method", "exit"}};
-    send_raw(exit_msg);
-    int waited = 0;
-    while (waited < 100) {
-      int status;
-      pid_t res = waitpid(pid, &status, WNOHANG);
-      if (res == pid)
-        break;
-      std::this_thread::sleep_for(std::chrono::milliseconds(10));
-      waited += 10;
+    poll(&pfd, 1, timeout);
+    if (pfd.revents & POLLIN) {
+      json exit_msg = {{"jsonrpc", "2.0"}, {"method", "exit"}};
+      send_raw(exit_msg);
+      uint32_t waited = 0;
+      while (waited < timeout) {
+        int status;
+        pid_t res = waitpid(pid, &status, WNOHANG);
+        if (res == pid)
+          break;
+        std::this_thread::sleep_for(10ms);
+        waited += 10;
+      }
     }
+    close(stdin_fd);
+    close(stdout_fd);
     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];
@@ -314,7 +330,7 @@ struct LSPInstance {
         if (it != pending.end()) {
           if (it->second->editor) {
             it->second->message = *msg;
-            lsp_response_queue.push_back(std::move(it->second));
+            lsp::response_queue.push(std::move(it->second));
           } else {
             auto message = *std::move(it->second);
             message.message = *msg;
@@ -337,7 +353,7 @@ struct LSPInstance {
         response->message = *msg;
         response->callback = editor_handle_wrapper;
         if (ed)
-          lsp_response_queue.push_back(std::move(response));
+          lsp::response_queue.push(std::move(response));
         else
           lsp_handle(*msg);
       }
@@ -346,11 +362,6 @@ struct LSPInstance {
   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 =

include/main.h

@@ -16,7 +16,6 @@ extern fs::path pwd;
 
 namespace ui {
 extern Bar bar;
-extern TileRoot *hover_popup;
 } // namespace ui
 
 #endif

include/pch.h

@@ -31,6 +31,7 @@ extern "C" {
 #include <filesystem>
 #include <fstream>
 #include <functional>
+#include <immintrin.h>
 #include <limits.h>
 #include <map>
 #include <mutex>

include/syntax/decl.h

@@ -6,6 +6,8 @@
 #include "pch.h"
 #include "syntax/trie.h"
 
+#define MAX_LINES_LOOKAROUND 512
+
 struct Highlight {
   uint32_t fg{0xFFFFFF};
   uint32_t bg{0x000000};
@@ -35,10 +37,23 @@ struct Token {
   TokenKind type;
 };
 
+struct StateBase {
+  virtual ~StateBase() = default;
+  virtual std::unique_ptr<StateBase> clone() const = 0;
+};
+
+struct CustomState : StateBase {
+  std::string value;
+  explicit CustomState(std::string v) : value(std::move(v)) {}
+  std::unique_ptr<StateBase> clone() const override {
+    return std::make_unique<CustomState>(value);
+  }
+};
+
 struct LineData {
-  std::shared_ptr<void> in_state{nullptr};
+  std::unique_ptr<StateBase> out_state;
   std::vector<Token> tokens;
-  std::shared_ptr<void> out_state{nullptr};
+  std::unique_ptr<StateBase> in_state;
 };
 
 #endif

include/syntax/langs.h

@@ -4,29 +4,19 @@
 #include "syntax/decl.h"
 
 #define DEF_LANG(name)                                                         \
-  std::shared_ptr<void> name##_parse(                                          \
-      std::vector<Token> *tokens, std::shared_ptr<void> in_state,              \
-      const char *text, uint32_t len, uint32_t line_num);                      \
-  bool name##_state_match(std::shared_ptr<void> state_1,                       \
-                          std::shared_ptr<void> state_2);
+  std::unique_ptr<StateBase> name##_parse(                                     \
+      std::vector<Token> *tokens, StateBase *in_state, const char *text,       \
+      uint32_t len, uint32_t line_num);                                        \
+  bool name##_state_match(StateBase *state_1, StateBase *state_2);
 
 #define LANG_A(name)                                                           \
   {                                                                            \
     #name, { name##_parse, name##_state_match }                                \
   }
 
-template <typename T>
-inline std::shared_ptr<T> ensure_state(std::shared_ptr<T> state) {
-  using U = typename T::full_state_type;
-  if (!state)
-    state = std::make_shared<T>();
-  if (!state.unique())
-    state = std::make_shared<T>(*state);
-  if (!state->full_state)
-    state->full_state = std::make_shared<U>();
-  else if (!state->full_state.unique())
-    state->full_state = std::make_shared<U>(*state->full_state);
-  return state;
+template <typename B, typename A>
+std::unique_ptr<B> static_unique_ptr_cast(std::unique_ptr<A> &&p) {
+  return std::unique_ptr<B>(static_cast<B *>(p.release()));
 }
 
 DEF_LANG(ruby);
@@ -34,11 +24,10 @@ DEF_LANG(bash);
 
 inline static const std::unordered_map<
     std::string,
-    std::tuple<std::shared_ptr<void> (*)(
-                   std::vector<Token> *tokens, std::shared_ptr<void> in_state,
+    std::tuple<std::unique_ptr<StateBase> (*)(
+                   std::vector<Token> *tokens, StateBase *in_state,
                    const char *text, uint32_t len, uint32_t line_num),
-               bool (*)(std::shared_ptr<void> state_1,
-                        std::shared_ptr<void> state_2)>>
+               bool (*)(StateBase *state_1, StateBase *state_2)>>
     parsers = {
         LANG_A(ruby),
         LANG_A(bash),

include/syntax/line_map.h

@@ -0,0 +1,136 @@
+#ifndef LINE_MAP_H
+#define LINE_MAP_H
+
+#include "syntax/decl.h"
+
+struct LineKey {
+  uint32_t line;
+  uint32_t version;
+  bool operator==(const LineKey &other) const {
+    return line == other.line && version == other.version;
+  }
+};
+
+struct LineKeyHash {
+  size_t operator()(const LineKey &key) const {
+    uint64_t combined = (uint64_t(key.line) << 32) | key.version;
+    return std::hash<uint64_t>()(combined);
+  }
+};
+
+struct EditDelta {
+  uint32_t start_line;
+  int64_t delta;
+};
+
+struct LineMap {
+  LineMap() : current_version(0) { edit_log.push_back({0, 0}); }
+
+  LineData *at(uint32_t line) {
+    auto key_opt = resolve_line(line);
+    if (!key_opt)
+      return nullptr;
+    LineKey key = *key_opt;
+    if (key.version == current_version)
+      return lines[key].get();
+    auto data_ptr = std::move(lines[key]);
+    lines.erase(key);
+    key = {line, current_version};
+    lines[key] = std::move(data_ptr);
+    return lines[key].get();
+  }
+
+  LineData *create_at(uint32_t line) {
+    auto key_opt = resolve_line(line);
+    LineKey key;
+    std::unique_ptr<LineData> data_ptr;
+    if (key_opt) {
+      key = *key_opt;
+      if (key.version == current_version)
+        return lines[key].get();
+      data_ptr = std::move(lines[key]);
+      lines.erase(key);
+    } else {
+      data_ptr = std::make_unique<LineData>();
+    }
+    key = {line, current_version};
+    lines[key] = std::move(data_ptr);
+    return lines[key].get();
+  }
+
+  void apply_edit(uint32_t start, int64_t delta) {
+    if (delta < 0)
+      batch_remove(start, -delta);
+    current_version++;
+    edit_log.push_back({start, delta});
+  }
+
+private:
+  std::unordered_map<LineKey, std::unique_ptr<LineData>, LineKeyHash> lines;
+
+  std::vector<EditDelta> edit_log;
+
+  uint32_t current_version;
+
+  void batch_remove(uint32_t line, uint32_t count) {
+    std::vector<uint32_t> lines_t;
+    lines_t.reserve(count);
+    for (uint32_t i = 0; i < count; i++)
+      lines_t.push_back(line + i);
+    for (int64_t v = current_version; v >= 0; v--) {
+      for (auto &l : lines_t) {
+        if (l == UINT32_MAX)
+          continue;
+        LineKey key = {l, (uint32_t)v};
+        if (lines.find(key) != lines.end()) {
+          lines.erase(key);
+          l = UINT32_MAX;
+        }
+      }
+      bool all_removed = true;
+      const auto &edit = edit_log[v];
+      for (auto &l : lines_t) {
+        if (l == UINT32_MAX)
+          continue;
+        all_removed = false;
+        if (edit.delta > 0) {
+          if (l >= edit.start_line) {
+            if (l < edit.start_line + edit.delta)
+              l = UINT32_MAX;
+            else
+              l -= edit.delta;
+          }
+        } else {
+          if (l >= edit.start_line)
+            l -= edit.delta;
+        }
+      }
+      if (all_removed)
+        break;
+    }
+    return;
+  }
+
+  std::optional<LineKey> resolve_line(uint32_t line) {
+    uint32_t current_line = line;
+    for (int64_t v = current_version; v >= 0; v--) {
+      LineKey key = {current_line, (uint32_t)v};
+      if (lines.find(key) != lines.end())
+        return key;
+      const auto &edit = edit_log[v];
+      if (edit.delta > 0) {
+        if (current_line >= edit.start_line) {
+          if (current_line < edit.start_line + edit.delta)
+            return std::nullopt;
+          current_line -= edit.delta;
+        }
+      } else {
+        if (current_line >= edit.start_line)
+          current_line -= edit.delta;
+      }
+    }
+    return std::nullopt;
+  }
+};
+
+#endif

include/syntax/line_tree.h

@@ -1,232 +0,0 @@
-#ifndef LINE_TREE_H
-#define LINE_TREE_H
-
-#include "syntax/decl.h"
-
-struct LineTree {
-  void clear() {
-    clear_node(root);
-    root = nullptr;
-    stack_size = 0;
-  }
-  void build(uint32_t x) { root = build_node(x); }
-  LineData *at(uint32_t x) {
-    LineNode *n = root;
-    while (n) {
-      uint32_t left_size = n->left ? n->left->size : 0;
-      if (x < left_size) {
-        n = n->left;
-      } else if (x < left_size + n->data.size()) {
-        return &n->data[x - left_size];
-      } else {
-        x -= left_size + n->data.size();
-        n = n->right;
-      }
-    }
-    return nullptr;
-  }
-  LineData *start_iter(uint32_t x) {
-    stack_size = 0;
-    LineNode *n = root;
-    while (n) {
-      uint32_t left_size = n->left ? n->left->size : 0;
-      if (x < left_size) {
-        push(n, 0);
-        n = n->left;
-      } else if (x < left_size + n->data.size()) {
-        push(n, x - left_size + 1);
-        return &n->data[x - left_size];
-      } else {
-        x -= left_size + n->data.size();
-        push(n, UINT32_MAX);
-        n = n->right;
-      }
-    }
-    return nullptr;
-  }
-  void end_iter() { stack_size = 0; }
-  LineData *next() {
-    while (stack_size) {
-      auto &f = stack[stack_size - 1];
-      LineNode *n = f.node;
-      if (f.index < n->data.size())
-        return &n->data[f.index++];
-      stack_size--;
-      if (n->right) {
-        n = n->right;
-        while (n) {
-          push(n, 0);
-          if (!n->left)
-            break;
-          n = n->left;
-        }
-        return &stack[stack_size - 1].node->data[0];
-      }
-    }
-    return nullptr;
-  }
-  void insert(uint32_t x, uint32_t y) {
-    if (x > subtree_size(root))
-      x = subtree_size(root);
-    root = insert_node(root, x, y);
-  }
-  void erase(uint32_t x, uint32_t y) {
-    if (x + y > subtree_size(root))
-      x = subtree_size(root) - y;
-    root = erase_node(root, x, y);
-  }
-  uint32_t count() { return subtree_size(root); }
-  ~LineTree() { clear(); }
-
-private:
-  struct LineNode {
-    LineNode *left = nullptr;
-    LineNode *right = nullptr;
-    uint8_t depth = 1;
-    uint32_t size = 0;
-    std::vector<LineData> data;
-  };
-  struct Frame {
-    LineNode *node;
-    uint32_t index;
-  };
-  void push(LineNode *n, uint32_t x) {
-    stack[stack_size].node = n;
-    stack[stack_size].index = x;
-    stack_size++;
-  }
-  static void clear_node(LineNode *n) {
-    if (!n)
-      return;
-    clear_node(n->left);
-    clear_node(n->right);
-    delete n;
-  }
-  LineNode *root = nullptr;
-  Frame stack[32];
-  std::atomic<uint8_t> stack_size = 0;
-  static constexpr uint32_t LEAF_TARGET = 256;
-  LineTree::LineNode *erase_node(LineNode *n, uint32_t x, uint32_t y) {
-    if (!n || y == 0)
-      return n;
-    uint32_t left_sz = subtree_size(n->left);
-    uint32_t mid_sz = n->data.size();
-    if (x < left_sz) {
-      uint32_t len = std::min(y, left_sz - x);
-      n->left = erase_node(n->left, x, len);
-      y -= len;
-      x = left_sz;
-    }
-    if (y > 0 && x < left_sz + mid_sz) {
-      uint32_t mid_x = x - left_sz;
-      uint32_t len = std::min(y, mid_sz - mid_x);
-      n->data.erase(n->data.begin() + mid_x, n->data.begin() + mid_x + len);
-      y -= len;
-      x += len;
-    }
-    if (y > 0) {
-      n->right = erase_node(n->right, x - left_sz - n->data.size(), y);
-    }
-    if (n->left && n->right &&
-        subtree_size(n->left) + subtree_size(n->right) < 256) {
-      return merge(n->left, n->right);
-    }
-    return rebalance(n);
-  }
-  LineTree::LineNode *insert_node(LineNode *n, uint32_t x, uint32_t y) {
-    if (!n) {
-      auto *leaf = new LineNode();
-      leaf->data.resize(y);
-      leaf->size = y;
-      return leaf;
-    }
-    if (!n->left && !n->right) {
-      n->data.insert(n->data.begin() + x, y, LineData());
-      fix(n);
-      if (n->data.size() > 512)
-        return split_leaf(n);
-      return n;
-    }
-    uint32_t left_size = subtree_size(n->left);
-    if (x <= left_size)
-      n->left = insert_node(n->left, x, y);
-    else
-      n->right = insert_node(n->right, x - left_size - n->data.size(), y);
-    return rebalance(n);
-  }
-  LineNode *build_node(uint32_t count) {
-    if (count <= LEAF_TARGET) {
-      auto *n = new LineNode();
-      n->data.resize(count);
-      n->size = count;
-      return n;
-    }
-    uint32_t left_count = count / 2;
-    uint32_t right_count = count - left_count;
-    auto *n = new LineNode();
-    n->left = build_node(left_count);
-    n->right = build_node(right_count);
-    fix(n);
-    return n;
-  }
-  static LineNode *split_leaf(LineNode *n) {
-    auto *right = new LineNode();
-    size_t mid = n->data.size() / 2;
-    right->data.assign(n->data.begin() + mid, n->data.end());
-    n->data.resize(mid);
-    fix(n);
-    fix(right);
-    auto *parent = new LineNode();
-    parent->left = n;
-    parent->right = right;
-    fix(parent);
-    return parent;
-  }
-  static LineNode *merge(LineNode *a, LineNode *b) {
-    a->data.insert(a->data.end(), b->data.begin(), b->data.end());
-    delete b;
-    fix(a);
-    return a;
-  }
-  static void fix(LineNode *n) {
-    n->depth = 1 + MAX(height(n->left), height(n->right));
-    n->size = subtree_size(n->left) + n->data.size() + subtree_size(n->right);
-  }
-  static LineNode *rotate_right(LineNode *y) {
-    LineNode *x = y->left;
-    LineNode *T2 = x->right;
-    x->right = y;
-    y->left = T2;
-    fix(y);
-    fix(x);
-    return x;
-  }
-  static LineNode *rotate_left(LineNode *x) {
-    LineNode *y = x->right;
-    LineNode *T2 = y->left;
-    y->left = x;
-    x->right = T2;
-    fix(x);
-    fix(y);
-    return y;
-  }
-  static LineNode *rebalance(LineNode *n) {
-    fix(n);
-    int balance = int(height(n->left)) - int(height(n->right));
-    if (balance > 1) {
-      if (height(n->left->left) < height(n->left->right))
-        n->left = rotate_left(n->left);
-      return rotate_right(n);
-    }
-    if (balance < -1) {
-      if (height(n->right->right) < height(n->right->left))
-        n->right = rotate_right(n->right);
-      return rotate_left(n);
-    }
-    return n;
-  }
-  static uint8_t height(LineNode *n) { return n ? n->depth : 0; }
-  static uint32_t subtree_size(LineNode *n) { return n ? n->size : 0; }
-};
-
-#endif

include/syntax/parser.h

@@ -3,24 +3,22 @@
 
 #include "ruby/decl.h"
 #include "syntax/decl.h"
-#include "syntax/line_tree.h"
+#include "syntax/line_map.h"
 
 struct Parser {
   struct Editor *editor = nullptr;
   std::string lang;
-  std::shared_ptr<void> (*parse_func)(std::vector<Token> *tokens,
-                                      std::shared_ptr<void> in_state,
-                                      const char *text, uint32_t len,
-                                      uint32_t line_num);
-  bool (*state_match_func)(std::shared_ptr<void> state_1,
-                           std::shared_ptr<void> state_2);
+  std::unique_ptr<StateBase> (*parse_func)(std::vector<Token> *tokens,
+                                           StateBase *in_state,
+                                           const char *text, uint32_t len,
+                                           uint32_t line_num);
+  bool (*state_match_func)(StateBase *state_1, StateBase *state_2);
   mrb_value parser_block = mrb_nil_value();
   mrb_value match_block = mrb_nil_value();
   bool is_custom{false};
   std::atomic<uint32_t> scroll_max{0};
   std::atomic<bool> scroll_dirty{false};
-  LineTree line_tree;
-  UniqueQueue<uint32_t> dirty_lines;
+  LineMap line_map = LineMap();
 
   Parser(Editor *editor, std::string n_lang, uint32_t n_scroll_max);
   void edit(uint32_t start_line, uint32_t removed_rows, uint32_t inserted_rows);

include/ui/diagnostics.h

@@ -1,19 +0,0 @@
-#ifndef UI_DIAGNOSTICS_H
-#define UI_DIAGNOSTICS_H
-
-#include "editor/decl.h"
-#include "io/sysio.h"
-#include "pch.h"
-#include "utils/utils.h"
-
-struct DiagnosticBox {
-  std::vector<VWarn> warnings;
-  std::vector<ScreenCell> cells;
-  Coord size;
-
-  void clear();
-  void render_first();
-  void render(Coord pos);
-};
-
-#endif

include/utils/utils.h

@@ -6,18 +6,19 @@
 template <typename T> struct Queue {
   void push(T val) {
     std::lock_guard<std::mutex> lock(m);
-    q.push(val);
+    q.push(std::move(val));
   }
   std::optional<T> front() {
+    std::lock_guard<std::mutex> lock(m);
     if (q.empty())
       return std::nullopt;
-    return q.front();
+    return std::move(q.front());
   }
   bool pop(T &val) {
     std::lock_guard<std::mutex> lock(m);
     if (q.empty())
       return false;
-    val = q.front();
+    val = std::move(q.front());
     q.pop();
     return true;
   }
@@ -92,6 +93,11 @@ struct Coord {
   bool operator>=(const Coord &other) const { return !(*this < other); }
 };
 
+static inline bool inside(Coord c, Coord pos, Coord size) {
+  return c.row >= pos.row && c.col >= pos.col && c.row - pos.row < size.row &&
+         c.col - pos.col < size.col;
+}
+
 struct Match {
   size_t start;
   size_t end;
@@ -132,6 +138,7 @@ std::string percent_encode(const std::string &s);
 std::string percent_decode(const std::string &s);
 uint32_t count_clusters(const char *line, size_t len, size_t from, size_t to);
 std::string trim(const std::string &s);
+std::string strip_newlines(const std::string &s);
 std::string substitute_fence(const std::string &documentation,
                              const std::string &lang);
 

include/windows/decl.h

@@ -22,6 +22,12 @@ struct Window : Tile {
   virtual std::array<std::string, 5> bar_info() { return {}; };
 };
 
+struct Popup : Window {
+  Coord pos;
+  Coord size;
+  virtual ~Popup() = default;
+};
+
 struct TileBlock : Tile {
   bool vertical;
   std::vector<std::unique_ptr<Tile>> tiles;
@@ -82,11 +88,12 @@ struct TileBlock : Tile {
   }
 };
 
-struct TileRoot {
+struct TileBase {
   std::unique_ptr<Tile> tile;
   Coord pos;
   Coord size;
 
+  inline bool hidden() { return this->tile->hidden; }
   void render(std::vector<ScreenCell> &buffer) {
     if (this->tile->hidden)
       return;
@@ -97,22 +104,14 @@ struct TileRoot {
     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;
+namespace layout {
+extern TileBase root_tile;
 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);
-}
+extern std::vector<std::unique_ptr<Popup>> popups;
+extern std::vector<std::unique_ptr<TileBase>> floating_tiles;
+} // namespace layout
 
 void render();
 void handle_click(KeyEvent event);

samples/ruby.rb

@@ -339,6 +339,5 @@ puts 'Ruby syntax highlighting test complete.'
 
 __END__
 
-
 Anything here should be ignored >><<
 {{{}}}[[[]]](((000)))

src/editor/adjustment.cc

@@ -2,72 +2,27 @@
 
 void Editor::ensure_cursor() {
   if (this->cursor < this->scroll) {
-    this->cursor.row = this->scroll.row;
-    this->cursor.col = this->scroll.col;
+    this->cursor = this->scroll;
     this->cursor_preffered = UINT32_MAX;
     return;
   }
   uint32_t 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 = this->scroll.row;
-  bool first_visual_line = true;
-  LineIterator *it = begin_l_iter(this->root, line_index);
-  if (!it)
-    return;
-  Coord last_visible = this->scroll;
-  while (true) {
-    if (visual_rows >= this->size.row)
-      break;
-    uint32_t line_len;
-    char *line = next_line(it, &line_len);
-    if (!line)
-      break;
-    if (line_len > 0 && line[line_len - 1] == '\n')
-      line_len--;
-    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 >= this->size.row)
-        break;
-      uint32_t col = 0;
-      uint32_t advance = 0;
-      uint32_t left = line_len - offset;
-      while (left > 0 && col < render_width) {
-        uint32_t g =
-            grapheme_next_character_break_utf8(line + offset + advance, left);
-        int w = display_width(line + offset + advance, g);
-        if (col + w > render_width)
-          break;
-        advance += g;
-        left -= g;
-        col += w;
-      }
-      if (line_index == this->cursor.row) {
-        if (this->cursor.col >= offset &&
-            this->cursor.col <= offset + advance) {
-          free(it->buffer);
-          free(it);
-          return;
-        }
-      }
-      if (advance == 0)
-        break;
-      offset += advance;
-      if (line_len == 0)
-        break;
-    }
-    line_index++;
+  uint32_t render_height = 0;
+  VisualIterator vis(root, scroll, render_width);
+  std::pair<Coord, Coord> vline;
+  Coord last_visible = scroll;
+  while ((vline = vis.next()).first.row != UINT32_MAX &&
+         render_height < this->size.row) {
+    render_height++;
+    last_visible = vline.first;
+    if (cursor >= vline.first && cursor < vline.second)
+      return;
   }
-  this->cursor.row = last_visible.row;
-  this->cursor.col = last_visible.col;
+  cursor = last_visible;
+  cursor_preffered = UINT32_MAX;
   this->cursor_preffered = UINT32_MAX;
-  free(it->buffer);
-  free(it);
 }
 
 void Editor::ensure_scroll() {

src/editor/click.cc

@@ -1,13 +1,10 @@
 #include "editor/editor.h"
-#include "main.h"
 
 Coord Editor::click_coord(uint32_t x, uint32_t y) {
-  if (mode == INSERT)
-    x++;
   uint32_t 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;
+  x = MAX(x, numlen) - numlen - 1;
   uint32_t target_visual_row = y;
   uint32_t visual_row = 0;
   uint32_t line_index = this->scroll.row;

src/editor/edit.cc

@@ -44,10 +44,10 @@ void Editor::edit_erase(Coord pos, int64_t len) {
     }
     uint32_t start_row = point.row;
     uint32_t end_row = pos.row;
-    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);
+    this->hooks.edit(start_row, end_row - start_row, 0);
     if (do_lsp) {
       auto lsp = this->lsp.load();
       if (lsp->incremental_sync) {
@@ -113,10 +113,10 @@ void Editor::edit_erase(Coord pos, int64_t len) {
     }
     uint32_t start_row = pos.row;
     uint32_t end_row = point.row;
-    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);
+    this->hooks.edit(start_row, end_row - start_row, 0);
     if (do_lsp) {
       auto lsp = this->lsp.load();
       if (lsp->incremental_sync) {
@@ -169,9 +169,9 @@ void Editor::edit_insert(Coord pos, char *data, uint32_t len) {
   for (uint32_t i = 0; i < len; i++)
     if (data[i] == '\n')
       rows++;
-  this->apply_hook_insertion(pos.row, rows);
   if (this->parser)
     this->parser->edit(pos.row, 0, rows);
+  this->hooks.edit(pos.row, 0, rows);
   auto lsp = this->lsp.load();
   if (lsp) {
     if (lsp->incremental_sync) {
@@ -232,10 +232,9 @@ void Editor::edit_replace(Coord start, Coord end, const char *text,
   for (uint32_t i = 0; i < len; i++)
     if (text[i] == '\n')
       rows++;
-  if (rows > 0)
-    rows--;
   if (this->parser)
     this->parser->edit(start.row, end.row - start.row, rows);
+  this->hooks.edit(start.row, end.row - start.row, rows);
   auto lsp = this->lsp.load();
   if (lsp) {
     if (lsp->incremental_sync) {

src/editor/events.cc

@@ -6,8 +6,8 @@
 
 void Editor::handle_event(KeyEvent event) {
   uint8_t old_mode = mode;
-  if (this->hover_active)
-    this->hover_active = false;
+  if (!this->hover_popup->hidden)
+    this->hover_popup->hidden = true;
   if (event.key_type == KEY_SPECIAL) {
     switch (event.special_modifier) {
     case 0:
@@ -67,12 +67,12 @@ void Editor::handle_event(KeyEvent event) {
         this->select_all();
         break;
       case CTRL('h'):
-        static_cast<HoverBox *>(ui::hover_popup->tile.get())->scroll(-1);
-        this->hover_active = true;
+        this->hover_popup->scroll(-1);
+        this->hover_popup->hidden = false;
         break;
       case CTRL('l'):
-        static_cast<HoverBox *>(ui::hover_popup->tile.get())->scroll(1);
-        this->hover_active = true;
+        this->hover_popup->scroll(1);
+        this->hover_popup->hidden = false;
         break;
       case 'h':
         this->fetch_lsp_hover();
@@ -96,7 +96,7 @@ void Editor::handle_event(KeyEvent event) {
         this->jumper_set = false;
         break;
       case 'N':
-        this->clear_hooks_at_line(this->cursor.row);
+        this->hooks.clear_line(this->cursor.row);
         break;
       case 's':
       case 'v':
@@ -218,18 +218,11 @@ void Editor::handle_event(KeyEvent event) {
     if (event.key_type == KEY_CHAR && event.len == 1 &&
         (event.c[0] >= '!' && event.c[0] <= '~')) {
       if (this->jumper_set) {
-        for (uint8_t i = 0; i < 94; i++)
-          if (this->hooks[i] == this->cursor.row + 1) {
-            this->hooks[i] = 0;
-            break;
-          }
-        this->hooks[event.c[0] - '!'] = this->cursor.row + 1;
+        this->hooks.set(event.c[0], this->cursor.row);
       } else {
-        uint32_t line = this->hooks[event.c[0] - '!'] - 1;
-        if (line > 0) {
+        uint32_t line;
+        if (this->hooks.get(event.c[0], &line))
           this->cursor = {line, 0};
-          this->cursor_preffered = UINT32_MAX;
-        }
       }
     }
     mode = NORMAL;

src/editor/helpers.cc

@@ -312,14 +312,6 @@ void Editor::delete_next_word() {
     this->edit_erase(this->cursor, next_col_cluster);
 }
 
-void Editor::clear_hooks_at_line(uint32_t line) {
-  for (uint8_t i = 0; i < 94; i++)
-    if (this->hooks[i] == line + 1) {
-      this->hooks[i] = 0;
-      break;
-    }
-}
-
 void Editor::cursor_prev_word() {
   uint32_t prev_col;
   word_boundaries(this->cursor, &prev_col, nullptr, nullptr, nullptr);
@@ -410,11 +402,10 @@ void Editor::fetch_lsp_hover() {
           hover_text += contents.get<std::string>();
         }
         if (!hover_text.empty()) {
-          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;
+          message.editor->hover_popup->clear();
+          message.editor->hover_popup->text = clean_text(hover_text);
+          message.editor->hover_popup->is_markup = is_markup;
+          message.editor->hover_popup->hidden = false;
         }
       }
     };
@@ -423,12 +414,14 @@ void Editor::fetch_lsp_hover() {
 }
 
 void Editor::handle_click(KeyEvent event, Coord size) {
-  focused_window = this;
+  layout::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;
   static Coord last_click_pos = {UINT32_MAX, UINT32_MAX};
+  if (!this->hover_popup->hidden)
+    this->hover_popup->hidden = true;
   if (event.key_type == KEY_MOUSE) {
     auto now = std::chrono::steady_clock::now();
     auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(

src/editor/renderer.cc

@@ -11,14 +11,7 @@ void Editor::render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) {
       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 (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 <= this->scroll.row)
-    ++hook_it;
+  this->hooks.start_iter(this->scroll.row);
   auto warn_it = this->warnings.begin();
   while (warn_it != this->warnings.end() && warn_it->line < this->scroll.row)
     ++warn_it;
@@ -31,7 +24,7 @@ void Editor::render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) {
         return (int)token.type;
     return 0;
   };
-  Coord screen = get_size();
+  Coord screen = {io::rows, io::cols};
   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) {
@@ -115,12 +108,8 @@ void Editor::render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) {
   while (rendered_rows < this->size.row) {
     uint32_t line_len;
     char *line = next_line(it, &line_len);
-    if (this->parser) {
-      if (line_data)
-        line_data = this->parser->line_tree.next();
-      else
-        line_data = this->parser->line_tree.start_iter(line_index);
-    }
+    if (this->parser)
+      line_data = this->parser->line_map.at(line_index);
     if (!line)
       break;
     if (line_len > 0 && line[line_len - 1] == '\n')
@@ -144,14 +133,9 @@ void Editor::render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) {
     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 = "";
-        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(pos.row + rendered_rows, pos.col, hook, 0xAAAAAA, 0, 0, 0, 1);
+        char hook = this->hooks.next(line_index);
+        update(pos.row + rendered_rows, pos.col, {hook, 0}, 0xAAAAAA, 0, 0, 0,
+               1);
         char buf[16];
         int len = snprintf(buf, sizeof(buf), "%*u ", numlen, line_index + 1);
         uint32_t num_color =
@@ -341,14 +325,8 @@ void Editor::render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) {
     if (line_len == 0 ||
         (current_byte_offset >= line_len && rendered_rows == 0)) {
       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(pos.row + rendered_rows, pos.col, hook, 0xAAAAAA, 0, 0, 0, 1);
+      char hook = this->hooks.next(line_index);
+      update(pos.row + rendered_rows, pos.col, {hook, 0}, 0xAAAAAA, 0, 0, 0, 1);
       char buf[16];
       int len = snprintf(buf, sizeof(buf), "%*u ", numlen, line_index + 1);
       uint32_t num_color = this->cursor.row == line_index ? 0xFFFFFF : 0x555555;
@@ -471,14 +449,10 @@ void Editor::render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) {
       break;
     }
     set_cursor(cursor.row, cursor.col, type, true);
-    // 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;
+    if (!this->hover_popup->hidden)
+      this->hover_popup->pos = cursor;
+    if (!this->diagnostic_popup->hidden)
+      this->diagnostic_popup->pos = cursor;
   }
   free(it->buffer);
   free(it);

src/editor/worker.cc

@@ -1,36 +1,33 @@
 #include "editor/editor.h"
 
-// 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 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->diagnostic_popup->hidden = true;
+    return;
+  }
+  editor->diagnostic_popup->clear();
+  editor->diagnostic_popup->warnings.swap(warnings_at_line);
+  editor->diagnostic_popup->hidden = false;
+}
 
 void Editor::work() {
   if (!this->root)
     return;
   if (this->parser)
     this->parser->work();
-  // hover_diagnostic(this);
+  hover_diagnostic(this);
   // if (this->completion.active && this->completion.hover_dirty) {
   //   this->completion.hover.render_first();
   //   this->completion.hover_dirty = false;

src/extentions/diagnostics.cc

@@ -0,0 +1,187 @@
+#include "extentions/diagnostics.h"
+#include <cstdint>
+
+DiagnosticBox *init_diagnostic() {
+  auto diagnostic = std::make_unique<DiagnosticBox>();
+  diagnostic->pos = {0, 0};
+  diagnostic->size = {1, 1};
+  diagnostic->hidden = true;
+  DiagnosticBox *ptr = diagnostic.get();
+  layout::popups.push_back(std::move(diagnostic));
+  return ptr;
+}
+
+void DiagnosticBox::render(std::vector<ScreenCell> &buffer, Coord n_size,
+                           Coord n_pos) {
+  pos = n_pos;
+  size = n_size;
+  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 = {io::rows, io::cols};
+  if (start_col + size.col > screen_size.col) {
+    start_col = screen_size.col - size.col;
+    if (start_col < 0)
+      start_col = 0;
+  }
+  pos.col = start_col;
+  pos.row = start_row;
+  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;
+  auto set = [&](uint32_t r, uint32_t c, std::string text, uint32_t fg,
+                 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;
+    if (r < 0 || r >= screen_size.row || c < 0 || c >= screen_size.col)
+      return;
+    ScreenCell &cell = buffer[r * screen_size.col + c];
+    cell.utf8 = std::move(text);
+    cell.width = width;
+    cell.fg = fg;
+    cell.bg = bg;
+    cell.flags = flags;
+    cell.ul_color = 0;
+  };
+  uint32_t base_bg = 0;
+  uint32_t border_fg = 0x82AAFF;
+  uint32_t r = 0;
+  if (warnings[0].source != "") {
+    std::string src_txt = "Source: ";
+    uint32_t i = 0;
+    for (; i < 8 && i < content_width; i++)
+      set(1, i + 1, (char[2]){src_txt[i], 0}, 0x3EAAFF, base_bg, 0, 1);
+    for (; i < 8 + warnings[0].source.length() && i < content_width; i++)
+      set(1, i + 1, (char[2]){warnings[0].source[i - 8], 0}, 0xffffff, base_bg,
+          0, 1);
+    while (i < content_width)
+      set(1, ++i, " ", 0xffffff, base_bg, 0, 1);
+    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, 1);
+    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, width);
+        c += width;
+        i += cluster_len;
+        for (int w = 1; w < width; w++)
+          set(r + 1, c - w + 1, "\x1b", c_sym, base_bg, 0, 0);
+      }
+      while (c < content_width)
+        set(r + 1, ++c, " ", 0xffffff, base_bg, 0, 1);
+      r++;
+    }
+    if (r >= 23)
+      break;
+    if (warn.code != "") {
+      uint32_t i = 0;
+      for (; i < 5 && i < content_width; i++)
+        set(r + 1, i, " ", 0x81cdc6, base_bg, 0, 1);
+      for (; i < warn.code.length() + 5 && i < content_width; i++)
+        set(r + 1, i, (char[2]){warn.code[i - 5], 0}, 0x81cdc6, base_bg, 0, 1);
+      while (i <= content_width)
+        set(r + 1, i++, " ", 0x81cdc6, base_bg, 0, 1);
+      r++;
+    }
+    if (r >= 23)
+      break;
+    for (std::string &see_also : warn.see_also) {
+      uint32_t fg = 0xB55EFF;
+      uint8_t colon_count = 0;
+      uint32_t i = 0;
+      for (; i < 5 && i < content_width; i++)
+        set(r + 1, i, " ", 0x81cdc6, base_bg, 0, 1);
+      for (; i < see_also.length() + 5 && i < content_width; i++) {
+        set(r + 1, i, (char[2]){see_also[i - 5], 0}, fg, base_bg, 0, 1);
+        if (see_also[i] == ':')
+          colon_count++;
+        if (colon_count == 2)
+          fg = 0xFFFFFF;
+      }
+      while (i <= content_width)
+        set(r + 1, i++, " ", fg, base_bg, 0, 1);
+      r++;
+      if (r >= 23)
+        break;
+    };
+    idx++;
+  }
+  size.row = 2 + r;
+  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, 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, 1);
+    set(r, size.col - 1, "│", border_fg, base_bg, 0, 1);
+  }
+  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, 1);
+  set(size.row - 1, size.col - 1, "┘", border_fg, base_bg, 0, 1);
+}

src/extentions/hover.cc

@@ -1,15 +1,16 @@
 #include "extentions/hover.h"
+#include "io/sysio.h"
 #include "syntax/decl.h"
 #include "windows/decl.h"
 
-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();
+HoverBox *init_hover() {
+  auto hover = std::make_unique<HoverBox>();
+  hover->pos = {0, 0};
+  hover->size = {1, 1};
+  hover->hidden = true;
+  HoverBox *ptr = hover.get();
+  layout::popups.push_back(std::move(hover));
+  return ptr;
 }
 
 void HoverBox::scroll(int32_t number) {
@@ -25,20 +26,25 @@ void HoverBox::scroll(int32_t number) {
   scroll_dirty = true;
 }
 
-void HoverBox::render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) {
+void HoverBox::render(std::vector<ScreenCell> &buffer, Coord n_size,
+                      Coord n_pos) {
+  pos = n_pos;
+  size = n_size;
   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;
-  // }
+  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 = {io::rows, io::cols};
+  if (start_col + size.col > screen_size.col) {
+    start_col = screen_size.col - size.col;
+    if (start_col < 0)
+      start_col = 0;
+  }
+  pos.col = start_col;
+  pos.row = start_row;
   uint32_t longest_line = 0;
   uint32_t current_width = 0;
   for (size_t j = 0; j < text.length(); j++) {
@@ -69,6 +75,8 @@ void HoverBox::render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) {
       return;
     r += pos.row;
     c += pos.col;
+    if (r < 0 || r >= screen_size.row || c < 0 || c >= screen_size.col)
+      return;
     ScreenCell &cell = buffer[r * screen_size.col + c];
     cell.utf8 = text;
     cell.width = width;
@@ -103,6 +111,8 @@ void HoverBox::render(std::vector<ScreenCell> &buffer, Coord size, Coord pos) {
       for (int w = 1; w < width; w++)
         set(r + 1, c - w + 1, "\x1b", 0xFFFFFF, base_bg, 0, 0);
     }
+    while (c < content_width)
+      set(r + 1, ++c, " ", 0xFFFFFF, base_bg, 0, 0);
     r++;
   }
   if (scroll_dirty)

src/io/renderer.cc

@@ -1,15 +1,19 @@
 #include "io/sysio.h"
 
+namespace io {
 std::vector<ScreenCell> new_screen;
-static uint32_t rows, cols;
-static bool show_cursor = 0;
-static std::vector<ScreenCell> old_screen;
-static termios orig_termios;
+uint32_t rows, cols;
+bool show_cursor = 0;
+std::vector<ScreenCell> old_screen;
+termios orig_termios;
+} // namespace io
+
+using namespace io;
 
 void disable_raw_mode() {
   std::string os = "\x1b[?1049l\x1b[2 q\x1b[?1002l\x1b[?25h\x1b[?2004l";
   write(STDOUT_FILENO, os.c_str(), os.size());
-  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios) == -1) {
+  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &io::orig_termios) == -1) {
     perror("tcsetattr");
     exit(EXIT_FAILURE);
   }
@@ -45,8 +49,6 @@ Coord start_screen() {
 
 void end_screen() { disable_raw_mode(); }
 
-Coord get_size() { return {rows, cols}; }
-
 void io_render() {
   static bool first_render = true;
   uint32_t current_fg = 0;

src/lsp/worker.cc

@@ -6,6 +6,7 @@ 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;
+Queue<std::unique_ptr<LSPMessage>> response_queue;
 } // namespace lsp
 
 void lsp_worker() {

src/main.cc

@@ -1,6 +1,5 @@
 #include "main.h"
 #include "editor/editor.h"
-#include "extentions/hover.h"
 #include "io/sysio.h"
 #include "lsp/lsp.h"
 #include "ruby/decl.h"
@@ -9,18 +8,16 @@
 #include "windows/decl.h"
 
 std::atomic<bool> running{true};
-Queue<KeyEvent> event_queue;
-fs::path pwd;
 std::atomic<uint8_t> mode = NORMAL;
+fs::path pwd;
 
 namespace ui {
 Bar bar;
-TileRoot *hover_popup = nullptr;
 } // namespace ui
 
 void background_lsp() {
   while (running)
-    throttle(8ms, lsp_worker);
+    throttle(16ms, lsp_worker);
 }
 
 int main(int argc, char *argv[]) {
@@ -33,46 +30,57 @@ int main(int argc, char *argv[]) {
   const char *filename = (argc > 1) ? argv[1] : "";
   uint8_t eol = read_line_endings();
 
-  ui::hover_popup = init_hover();
+  layout::root_tile.pos = {0, 0};
+  layout::root_tile.size = {screen.row - 2, screen.col - 1};
+  auto editor = std::make_unique<Editor>(filename, eol);
+  layout::focused_window = editor.get();
+  auto block = std::make_unique<TileBlock>();
+  block->tiles.push_back(std::move(editor));
+  layout::root_tile.tile = std::move(block);
 
-  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) {
-      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);
+    layout::focused_window->work();
+    render();
+    throttle(16ms, io_render);
+    KeyEvent event;
+    while (running && lsp::response_queue.empty() &&
+           (event = read_key()).key_type == KEY_NONE)
+      std::this_thread::sleep_for(1ms);
+    uint8_t consumed = 0;
+    do {
+      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;
+          goto quit;
         }
-      } else {
-        ui::bar.handle_event(event);
+        if (mode != RUNNER) {
+          if (event.key_type == KEY_MOUSE) {
+            handle_click(event);
+          } else {
+            layout::focused_window->handle_event(event);
+          }
+        } else {
+          ui::bar.handle_event(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);
-    }
-    for (auto &lsp_inst : lsp::active_lsps)
-      lsp_inst.second->callbacks();
-    focused_window->work();
-    throttle(4ms, render);
-    throttle(4ms, io_render);
+    } while (++consumed < 32 && (event = read_key()).key_type != KEY_NONE);
+    std::unique_ptr<LSPMessage> msg;
+    while (lsp::response_queue.pop(msg)) {
+      msg->callback(*msg);
+    };
   }
 
+quit:
+
   if (lsp_thread.joinable())
     lsp_thread.join();