Basic lsp and precompiler header support

2025-12-24 11:08:25 +00:00
parent 85d4039a5e
commit a10dd92249
20 changed files with 1499 additions and 389 deletions
--- a/39
+++ b/39
@@ -1,10 +1,14 @@
 SRC_DIR := src
 BIN_DIR := bin
 OBJ_DIR := build
+INCLUDE_DIR := include

 TARGET_DEBUG := $(BIN_DIR)/crib-dbg
 TARGET_RELEASE := $(BIN_DIR)/crib

+PCH_DEBUG := $(OBJ_DIR)/debug/pch.h.gch
+PCH_RELEASE := $(OBJ_DIR)/release/pch.h.gch
+
 CCACHE := ccache
 CXX_DEBUG := $(CCACHE) g++
 CXX_RELEASE := $(CCACHE) clang++
@@ -18,6 +22,9 @@ CFLAGS_RELEASE := -std=c++20 -O3 -march=native -flto=thin \
 	-mllvm -vectorize-loops \
 	-fno-unwind-tables -fno-asynchronous-unwind-tables

+PCH_CFLAGS_DEBUG := $(CFLAGS_DEBUG) -x c++-header
+PCH_CFLAGS_RELEASE := $(CFLAGS_RELEASE) -x c++-header
+
 UNICODE_SRC := $(wildcard libs/unicode_width/*.c)

 UNICODE_OBJ_DEBUG := $(patsubst libs/unicode_width/%.c,$(OBJ_DIR)/debug/unicode_width/%.o,$(UNICODE_SRC))
@@ -50,21 +57,29 @@ test: $(TARGET_DEBUG)

 release: $(TARGET_RELEASE)

-$(TARGET_DEBUG): $(OBJ_DEBUG) $(UNICODE_OBJ_DEBUG)
-	mkdir -p $(BIN_DIR)
-	$(CXX_DEBUG) $(CFLAGS_DEBUG) -o $@ $^ $(LIBS)
-
-$(TARGET_RELEASE): $(OBJ_RELEASE) $(UNICODE_OBJ_RELEASE)
-	mkdir -p $(BIN_DIR)
-	$(CXX_RELEASE) $(CFLAGS_RELEASE) -o $@ $^ $(LIBS)
-
-$(OBJ_DIR)/debug/%.o: $(SRC_DIR)/%.cc
+$(PCH_DEBUG): $(INCLUDE_DIR)/pch.h
 	mkdir -p $(dir $@)
-	$(CXX_DEBUG) $(CFLAGS_DEBUG) -MMD -MP -c $< -o $@
+	$(CXX_DEBUG) $(PCH_CFLAGS_DEBUG) -o $@ $<

-$(OBJ_DIR)/release/%.o: $(SRC_DIR)/%.cc
+$(PCH_RELEASE): $(INCLUDE_DIR)/pch.h
 	mkdir -p $(dir $@)
-	$(CXX_RELEASE) $(CFLAGS_RELEASE) -MMD -MP -c $< -o $@
+	$(CXX_RELEASE) $(PCH_CFLAGS_RELEASE) -o $@ $<
+
+$(TARGET_DEBUG): $(PCH_DEBUG) $(OBJ_DEBUG) $(UNICODE_OBJ_DEBUG)
+	mkdir -p $(BIN_DIR)
+	$(CXX_DEBUG) $(CFLAGS_DEBUG) -o $@ $(OBJ_DEBUG) $(UNICODE_OBJ_DEBUG) $(LIBS)
+
+$(TARGET_RELEASE): $(PCH_RELEASE) $(OBJ_RELEASE) $(UNICODE_OBJ_RELEASE)
+	mkdir -p $(BIN_DIR)
+	$(CXX_RELEASE) $(CFLAGS_RELEASE) -o $@ $(OBJ_RELEASE) $(UNICODE_OBJ_RELEASE) $(LIBS)
+
+$(OBJ_DIR)/debug/%.o: $(SRC_DIR)/%.cc $(PCH_DEBUG)
+	mkdir -p $(dir $@)
+	$(CXX_DEBUG) $(CFLAGS_DEBUG) -include $(INCLUDE_DIR)/pch.h -MMD -MP -c $< -o $@
+
+$(OBJ_DIR)/release/%.o: $(SRC_DIR)/%.cc $(PCH_RELEASE)
+	mkdir -p $(dir $@)
+	$(CXX_RELEASE) $(CFLAGS_RELEASE) -include $(INCLUDE_DIR)/pch.h -MMD -MP -c $< -o $@

 $(OBJ_DIR)/debug/unicode_width/%.o: libs/unicode_width/%.c
 	mkdir -p $(dir $@)
--- a/README.md
+++ b/README.md
@@ -19,6 +19,7 @@ A TUI IDE.
        - `textDocument/foldingRange` - i will never use this for folding but it might be useful for other things.
        - `textDocument/rename` & `textDocument/prepareRename` - probably useful
        - And a lot more (just go through each for `clangd` and then expand to say `solargraph`).
+    - Make incremental edits apply.
    - Make a universal plug for lsp. So focus more on making a general purpose solid communication interface. Instead of something specific.
        - With a 4ish pass system. (more like each returned value from the lsp is used in 4 ways)
            1. One for stuff like jump to x position. or rename symbol x to y. (stuff that explicitly requires user request to do something)
@@ -52,3 +53,4 @@ A TUI IDE.
 - [ ] Add this thing where selection double click on a bracket selects whole block.
    - (only on the first time) and sets mode to `WORD`.
 - [ ] Redo folding system and its relation to move_line_* functions. (Currently its a mess)
+- [ ] Make whole thing event driven and not clock driven.
--- a/grammar/cpp.scm
+++ b/grammar/cpp.scm
@@ -0,0 +1,613 @@
+;; #ffffff #000000 0 0 0 1
+((identifier) @variable
+  (#set! priority 95))
+
+(preproc_def
+  (preproc_arg) @variable)
+
+;; #fbb152 #000000 0 0 0 1
+[
+  "default"
+  "goto"
+  "asm"
+  "__asm__"
+] @keyword
+
+[
+  "enum"
+  "struct"
+  "union"
+  "typedef"
+] @keyword.type
+
+[
+  "sizeof"
+  "offsetof"
+] @keyword.operator
+
+(alignof_expression
+  .
+  _ @keyword.operator)
+
+;; #fbb152 #000000 0 0 0 1
+"return" @keyword.return
+
+;; #fbb152 #000000 0 0 0 1
+[
+  "while"
+  "for"
+  "do"
+  "continue"
+  "break"
+] @keyword.repeat
+
+;; #fbb152 #000000 0 0 0 1
+[
+  "if"
+  "else"
+  "case"
+  "switch"
+] @keyword.conditional
+
+;; #fbb152 #000000 0 0 0 1
+[
+  "#if"
+  "#ifdef"
+  "#ifndef"
+  "#else"
+  "#elif"
+  "#endif"
+  "#elifdef"
+  "#elifndef"
+  (preproc_directive)
+] @keyword.directive
+
+;; #fbb152 #000000 0 0 0 1
+"#define" @keyword.directive.define
+
+;; #fbb152 #000000 0 0 0 1
+"#include" @keyword.import
+
+;; #bd9ae6 #000000 0 0 0 1
+[
+  ";"
+  ":"
+  ","
+  "."
+  "::"
+] @punctuation.delimiter
+
+;; #e6a24c #000000 0 0 0 2
+"..." @punctuation.special
+
+;; #bd9ae6 #000000 0 0 0 1
+[
+  "("
+  ")"
+  "["
+  "]"
+  "{"
+  "}"
+] @punctuation.bracket
+
+;; #ffffff #000000 0 0 0 1
+[
+  "="
+  "-"
+  "*"
+  "/"
+  "+"
+  "%"
+  "~"
+  "|"
+  "&"
+  "^"
+  "<<"
+  ">>"
+  "->"
+  "<"
+  "<="
+  ">="
+  ">"
+  "=="
+  "!="
+  "!"
+  "&&"
+  "||"
+  "-="
+  "+="
+  "*="
+  "/="
+  "%="
+  "|="
+  "&="
+  "^="
+  ">>="
+  "<<="
+  "--"
+  "++"
+] @operator
+
+;; #ffffff #000000 0 0 0 1
+(comma_expression
+  "," @operator)
+
+;; #51eeba #000000 0 0 0 1
+[
+  (true)
+  (false)
+] @boolean
+
+;; #fbb152 #000000 0 0 0 1
+(conditional_expression
+  [
+    "?"
+    ":"
+  ] @keyword.conditional.ternary)
+
+;; #aad84c #000000 0 0 0 1
+(string_literal) @string
+
+(system_lib_string) @string
+
+;; #e6a24c #000000 0 0 0 2
+(escape_sequence) @string.escape
+
+;; #ebda8c #000000 0 0 0 1
+(null) @constant.builtin
+
+;; #ebda8c #000000 0 0 0 1
+(number_literal) @number
+
+;; #ebda8c #000000 0 0 0 1
+(char_literal) @character
+
+;; #aad84c #000000 0 0 0 1
+(preproc_defined) @function.macro
+
+;; #ffffff #000000 0 0 0 1
+((field_expression
+  (field_identifier) @property) @_parent)
+
+(field_designator) @property
+
+((field_identifier) @property)
+
+;; #fbb152 #000000 0 0 0 1
+(statement_identifier) @label
+
+(declaration
+  type: (type_identifier) @_type
+  declarator: (identifier) @label
+  (#match? @_type "^__label__$"))
+
+;; #aad84c #000000 0 0 0 1
+[
+  (type_identifier)
+  (type_descriptor)
+] @type
+
+;; #fbb152 #000000 0 0 0 1
+(storage_class_specifier) @keyword.modifier
+
+[
+  (type_qualifier)
+  (gnu_asm_qualifier)
+  "__extension__"
+] @keyword.modifier
+
+;; #fbb152 #000000 0 0 0 1
+(linkage_specification
+  "extern" @keyword.modifier)
+
+;; #aad84c #000000 0 0 0 1
+(type_definition
+  declarator: (type_identifier) @type.definition)
+
+;; #aad84c #000000 0 0 0 1
+(primitive_type) @type.builtin
+
+(sized_type_specifier
+  _ @type.builtin
+  type: _?)
+
+;; #ebda8c #000000 0 0 0 1
+((identifier) @constant
+  (#match? @constant "^[A-Z][A-Z0-9_]+$"))
+
+(preproc_def
+  (preproc_arg) @constant
+  (#match? @constant "^[A-Z][A-Z0-9_]+$"))
+
+(enumerator
+  name: (identifier) @constant)
+
+(case_statement
+  value: (identifier) @constant)
+
+;; #ebda8c #000000 0 0 0 1
+((identifier) @constant.builtin
+  (#match? @constant.builtin "^(stderr|stdin|stdout|__FILE__|__LINE__|__DATE__|__TIME__|__STDC__|__STDC_VERSION__|__STDC_HOSTED__|__cplusplus|__OBJC__|__ASSEMBLER__|__BASE_FILE__|__FILE_NAME__|__INCLUDE_LEVEL__|__TIMESTAMP__|__clang__|__clang_major__|__clang_minor__|__clang_patchlevel__|__clang_version__|__clang_literal_encoding__|__clang_wide_literal_encoding__|__FUNCTION__|__func__|__PRETTY_FUNCTION__|__VA_ARGS__|__VA_OPT__)$"))
+
+(preproc_def
+  (preproc_arg) @constant.builtin
+  (#match? @constant.builtin "^(stderr|stdin|stdout|__FILE__|__LINE__|__DATE__|__TIME__|__STDC__|__STDC_VERSION__|__STDC_HOSTED__|__cplusplus|__OBJC__|__ASSEMBLER__|__BASE_FILE__|__FILE_NAME__|__INCLUDE_LEVEL__|__TIMESTAMP__|__clang__|__clang_major__|__clang_minor__|__clang_patchlevel__|__clang_version__|__clang_literal_encoding__|__clang_wide_literal_encoding__|__FUNCTION__|__func__|__PRETTY_FUNCTION__|__VA_ARGS__|__VA_OPT__)$"))
+
+;; #ffffff #000000 0 0 0 1
+(attribute_specifier
+  (argument_list
+    (identifier) @variable.builtin))
+
+(attribute_specifier
+  (argument_list
+    (call_expression
+      function: (identifier) @variable.builtin)))
+
+;; #aad84c #000000 0 0 0 1
+((call_expression
+  function: (identifier) @function.builtin)
+  (#match? @function.builtin "^__builtin_"))
+
+((call_expression
+  function: (identifier) @function.builtin))
+
+;; #ebda8c #000000 0 0 0 1
+(preproc_def
+  name: (_) @constant.macro)
+
+(preproc_call
+  directive: (preproc_directive) @_u
+  argument: (_) @constant.macro
+  (#match? @_u "^#undef$"))
+
+(preproc_ifdef
+  name: (identifier) @constant.macro)
+
+(preproc_elifdef
+  name: (identifier) @constant.macro)
+
+(preproc_defined
+  (identifier) @constant.macro)
+
+;; #aad84c #000000 0 0 0 3
+(call_expression
+  function: (identifier) @function.call)
+
+(call_expression
+  function: (field_expression
+    field: (field_identifier) @function.call))
+
+;; #aad84c #000000 0 0 0 3
+(function_declarator
+  declarator: (identifier) @function)
+
+(function_declarator
+  declarator: (parenthesized_declarator
+    (pointer_declarator
+      declarator: (field_identifier) @function)))
+
+;; #aad84c #000000 0 0 0 3
+(preproc_function_def
+  name: (identifier) @function.macro)
+
+;; #AAAAAA #000000 0 1 0 1
+(comment) @comment @spell
+
+;; #AAAAAA #000000 0 1 0 1
+((comment) @comment.documentation
+  (#match? @comment.documentation "^/[*][*][^*].*[*]/$"))
+
+;; #ffffff #000000 0 0 0 1
+(parameter_declaration
+  declarator: (identifier) @variable.parameter)
+
+(parameter_declaration
+  declarator: (array_declarator) @variable.parameter)
+
+(parameter_declaration
+  declarator: (pointer_declarator) @variable.parameter)
+
+(preproc_params
+  (identifier) @variable.parameter)
+
+;; #fbb152 #000000 0 0 0 1
+[
+  "__attribute__"
+  "__declspec"
+  "__based"
+  "__cdecl"
+  "__clrcall"
+  "__stdcall"
+  "__fastcall"
+  "__thiscall"
+  "__vectorcall"
+  (ms_pointer_modifier)
+  (attribute_declaration)
+] @attribute
+
+;; #ffffff #000000 0 0 0 1
+((identifier) @variable.member
+  (#match? @variable.member "^m_.*$"))
+
+(parameter_declaration
+  declarator: (reference_declarator) @variable.parameter)
+
+(variadic_parameter_declaration
+  declarator: (variadic_declarator
+    (_) @variable.parameter))
+
+(optional_parameter_declaration
+  declarator: (_) @variable.parameter)
+
+;; #ffffff #000000 0 0 0 1
+((field_expression
+  (field_identifier) @function.method) @_parent)
+
+(field_declaration
+  (field_identifier) @variable.member)
+
+(field_initializer
+  (field_identifier) @property)
+
+(function_declarator
+  declarator: (field_identifier) @function.method)
+
+;; #aad84c #000000 0 0 0 3
+(concept_definition
+  name: (identifier) @type.definition)
+
+(alias_declaration
+  name: (type_identifier) @type.definition)
+
+;; #aad84c #000000 0 0 0 1
+(auto) @type.builtin
+
+;; #aad84c #000000 0 0 0 1
+(namespace_identifier) @module
+
+;; #aad84c #000000 0 0 0 1
+((namespace_identifier) @type
+  (#match? @type "^[A-Z]"))
+
+;; #ebda8c #000000 0 0 0 1
+(case_statement
+  value: (qualified_identifier
+    (identifier) @constant))
+
+;; #fbb152 #000000 0 0 0 1
+(using_declaration
+  .
+  "using"
+  .
+  "namespace"
+  .
+  [
+    (qualified_identifier)
+    (identifier)
+  ] @module)
+
+;; #aad84c #000000 0 0 0 3
+(destructor_name
+  (identifier) @function.method)
+
+;; #aad84c #000000 0 0 0 3
+(function_declarator
+  (qualified_identifier
+    (identifier) @function))
+
+(function_declarator
+  (qualified_identifier
+    (qualified_identifier
+      (identifier) @function)))
+
+(function_declarator
+  (qualified_identifier
+    (qualified_identifier
+      (qualified_identifier
+        (identifier) @function))))
+
+((qualified_identifier
+  (qualified_identifier
+    (qualified_identifier
+      (qualified_identifier
+        (identifier) @function)))) @_parent)
+
+(function_declarator
+  (template_function
+    (identifier) @function))
+
+(operator_name) @function
+
+"operator" @function
+
+;; #aad84c #000000 0 0 0 3
+"static_assert" @function.builtin
+
+;; #aad84c #000000 0 0 0 3
+(call_expression
+  (qualified_identifier
+    (identifier) @function.call))
+
+(call_expression
+  (qualified_identifier
+    (qualified_identifier
+      (identifier) @function.call)))
+
+(call_expression
+  (qualified_identifier
+    (qualified_identifier
+      (qualified_identifier
+        (identifier) @function.call))))
+
+((qualified_identifier
+  (qualified_identifier
+    (qualified_identifier
+      (qualified_identifier
+        (identifier) @function.call)))) @_parent)
+
+(call_expression
+  (template_function
+    (identifier) @function.call))
+
+(call_expression
+  (qualified_identifier
+    (template_function
+      (identifier) @function.call)))
+
+(call_expression
+  (qualified_identifier
+    (qualified_identifier
+      (template_function
+        (identifier) @function.call))))
+
+(call_expression
+  (qualified_identifier
+    (qualified_identifier
+      (qualified_identifier
+        (template_function
+          (identifier) @function.call)))))
+
+((qualified_identifier
+  (qualified_identifier
+    (qualified_identifier
+      (qualified_identifier
+        (template_function
+          (identifier) @function.call))))) @_parent)
+
+(function_declarator
+  (template_method
+    (field_identifier) @function.method))
+
+;; #aad84c #000000 0 0 0 3
+(call_expression
+  (field_expression
+    (field_identifier) @function.method.call))
+
+(call_expression
+  (field_expression
+    (template_method
+      (field_identifier) @function.method.call)))
+
+;; #aad84c #000000 0 0 0 3
+((function_declarator
+  (qualified_identifier
+    (identifier) @constructor))
+  (#match? @constructor "^[A-Z]"))
+
+((call_expression
+  function: (identifier) @constructor)
+  (#match? @constructor "^[A-Z]"))
+
+((call_expression
+  function: (qualified_identifier
+    name: (identifier) @constructor))
+  (#match? @constructor "^[A-Z]"))
+
+((call_expression
+  function: (field_expression
+    field: (field_identifier) @constructor))
+  (#match? @constructor "^[A-Z]"))
+
+((field_initializer
+  (field_identifier) @constructor
+  (argument_list))
+  (#match? @constructor "^[A-Z]"))
+
+;; #ffffff #000000 0 0 0 1
+(this) @variable.builtin
+
+;; #ebda8c #000000 0 0 0 1
+(null
+  "nullptr" @constant.builtin)
+
+;; #51eeba #000000 0 0 0 2
+(true) @boolean_true
+
+;; #ee513a #000000 0 0 0 2
+(false) @boolean_false
+
+;; #aad84c #000000 0 0 0 1
+(raw_string_literal) @string
+
+;; #fbb152 #000000 0 0 0 1
+[
+  "try"
+  "catch"
+  "noexcept"
+  "throw"
+] @keyword.exception
+
+;; #fbb152 #000000 0 0 0 1
+[
+  "decltype"
+  "explicit"
+  "friend"
+  "override"
+  "using"
+  "requires"
+  "constexpr"
+] @keyword
+
+;; #fbb152 #000000 0 0 0 1
+[
+  "class"
+  "namespace"
+  "template"
+  "typename"
+  "concept"
+] @keyword.type
+
+;; #fbb152 #000000 0 0 0 1
+[
+  "co_await"
+  "co_yield"
+  "co_return"
+] @keyword.coroutine
+
+;; #fbb152 #000000 0 0 0 1
+[
+  "public"
+  "private"
+  "protected"
+  "final"
+  "virtual"
+] @keyword.modifier
+
+;; #fbb152 #000000 0 0 0 1
+[
+  "new"
+  "delete"
+  "xor"
+  "bitand"
+  "bitor"
+  "compl"
+  "not"
+  "xor_eq"
+  "and_eq"
+  "or_eq"
+  "not_eq"
+  "and"
+  "or"
+] @keyword.operator
+
+;; #ffffff #000000 0 0 0 1
+"<=>" @operator
+
+;; #bd9ae6 #000000 0 0 0 1
+"::" @punctuation.delimiter
+
+;; #bd9ae6 #000000 0 0 0 1
+(template_argument_list
+  [
+    "<"
+    ">"
+  ] @punctuation.bracket)
+
+(template_parameter_list
+  [
+    "<"
+    ">"
+  ] @punctuation.bracket)
+
+;; #ffffff #000000 0 0 0 1
+(literal_suffix) @operator
--- a/include/editor.h
+++ b/include/editor.h
@@ -1,23 +1,16 @@
 #ifndef EDITOR_H
 #define EDITOR_H

-#include "../libs/tree-sitter/lib/include/tree_sitter/api.h"
 #include "./knot.h"
+#include "./pch.h"
 #include "./ui.h"
 #include "./utils.h"
-#include <algorithm>
-#include <cstdint>
-#include <map>
-#include <shared_mutex>
-#include <unordered_map>
-#include <vector>

 #define CHAR 0
 #define WORD 1
 #define LINE 2

 #define EXTRA_META 4
-
 #define INDENT_WIDTH 2

 struct Highlight {
@@ -125,7 +118,8 @@ struct VAI {
 };

 struct Editor {
-  const char *filename;
+  std::string filename;
+  std::string uri;
  Knot *root;
  std::shared_mutex knot_mtx;
  Coord cursor;
@@ -138,6 +132,7 @@ struct Editor {
  Coord scroll;
  TSTree *tree;
  TSParser *parser;
+  std::string query_file;
  TSQuery *query;
  const TSLanguage *language;
  Queue<TSInputEdit> edit_queue;
@@ -150,6 +145,8 @@ struct Editor {
  std::vector<VHint> hints;
  std::vector<VWarn> warnings;
  VAI ai;
+  std::shared_mutex lsp_mtx;
+  struct LSPInstance *lsp;
 };

 inline const Fold *fold_for_line(const std::vector<Fold> &folds,
@@ -217,6 +214,8 @@ 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);
+Coord move_left_pure(Editor *editor, Coord cursor, uint32_t number);
+Coord move_right_pure(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);
@@ -247,5 +246,6 @@ void apply_line_deletion(Editor *editor, uint32_t removal_start,
 uint32_t leading_indent(const char *line, uint32_t len);
 uint32_t get_indent(Editor *editor, Coord cursor);
 bool closing_after_cursor(const char *line, uint32_t len, uint32_t col);
+// void editor_lsp_handle(Editor *editor, json msg);

 #endif
--- a/include/knot.h
+++ b/include/knot.h
@@ -1,9 +1,8 @@
 #ifndef ROPE_H
 #define ROPE_H

+#include "./pch.h"
 #include "./utils.h"
-#include <cstdint>
-#include <vector>

 #define MIN_CHUNK_SIZE 64       // 64 Bytes
 #define MAX_CHUNK_SIZE 1024 * 8 // 8192 Bytes (8 KiB)
--- a/include/lsp.h
+++ b/include/lsp.h
@@ -0,0 +1,56 @@
+#ifndef LSP_H
+#define LSP_H
+
+#include "./editor.h"
+#include "./pch.h"
+#include "utils.h"
+
+struct LSP {
+  const char *command;
+  std::vector<const char *> args;
+};
+
+struct LSPPending {
+  std::string method;
+  Editor *editor = nullptr;
+
+  std::function<void(Editor *, std::string, json)> callback;
+};
+
+struct LSPOpenRequest {
+  Language language;
+  Editor *editor;
+};
+
+struct LSPInstance {
+  std::shared_mutex mtx;
+  LSP *lsp;
+  std::string root_dir;
+  int pid{-1};
+  int stdin_fd{-1};
+  int stdout_fd{-1};
+  bool initialized = false;
+  uint32_t last_id = 0;
+  Queue<json> inbox;
+  Queue<json> outbox;
+  std::unordered_map<uint32_t, LSPPending *> pending;
+  std::vector<Editor *> editors;
+};
+
+extern std::shared_mutex active_lsps_mtx;
+extern std::unordered_map<uint8_t, LSPInstance *> active_lsps;
+extern std::unordered_map<uint8_t, LSP> lsp_map;
+
+void lsp_worker();
+void lsp_handle(LSPInstance *lsp, json message);
+
+LSPInstance *get_or_init_lsp(uint8_t lsp_id);
+void close_lsp(uint8_t lsp_id);
+
+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_send(LSPInstance *lsp, json message, LSPPending *pending);
+
+#endif
--- a/include/main.h
+++ b/include/main.h
@@ -1,8 +1,7 @@
 #ifndef MAIN_H
 #define MAIN_H

-#include <atomic>
-#include <vector>
+#include "./pch.h"

 #define NORMAL 0
 #define INSERT 1
--- a/include/pch.h
+++ b/include/pch.h
@@ -0,0 +1,33 @@
+#ifndef PCH_H
+#define PCH_H
+
+#define PCRE2_CODE_UNIT_WIDTH 8
+#define PCRE_WORKSPACE_SIZE 512
+
+#include "../libs/tree-sitter/lib/include/tree_sitter/api.h"
+#include <algorithm>
+#include <atomic>
+#include <chrono>
+#include <cstdint>
+#include <deque>
+#include <functional>
+#include <map>
+#include <mutex>
+#include <nlohmann/json.hpp>
+#include <optional>
+#include <pcre2.h>
+#include <queue>
+#include <shared_mutex>
+#include <string.h>
+#include <string>
+#include <sys/ioctl.h>
+#include <termios.h>
+#include <thread>
+#include <unistd.h>
+#include <unordered_map>
+#include <vector>
+
+using json = nlohmann::json;
+using namespace std::chrono_literals;
+
+#endif
--- a/include/ts.h
+++ b/include/ts.h
@@ -2,8 +2,8 @@
 #define TS_H

 #include "./editor.h"
+#include "./pch.h"
 #include "./utils.h"
-#include <pcre2.h>

 #define HEX(s) (static_cast<uint32_t>(std::stoul(s, nullptr, 16)))

--- a/include/ts_def.h
+++ b/include/ts_def.h
@@ -1,9 +1,12 @@
-#include "../libs/tree-sitter/lib/include/tree_sitter/api.h"
-#include <string>
+#ifndef TS_DEF_H
+#define TS_DEF_H
+
+#include "./pch.h"

 struct Language {
  std::string name;
  const TSLanguage *(*fn)();
+  uint8_t lsp_id = 0;
 };

 extern "C" {
@@ -22,3 +25,5 @@ const TSLanguage *tree_sitter_make();
 const TSLanguage *tree_sitter_python();
 const TSLanguage *tree_sitter_ruby();
 }
+
+#endif
--- a/include/ui.h
+++ b/include/ui.h
@@ -1,16 +1,8 @@
 #ifndef UI_H
 #define UI_H

+#include "./pch.h"
 #include "./utils.h"
-#include <atomic>
-#include <cstdint>
-#include <mutex>
-#include <string.h>
-#include <string>
-#include <sys/ioctl.h>
-#include <termios.h>
-#include <unistd.h>
-#include <vector>

 #define KEY_CHAR 0
 #define KEY_SPECIAL 1
--- a/include/utils.h
+++ b/include/utils.h
@@ -1,16 +1,8 @@
 #ifndef UTILS_H
 #define UTILS_H

+#include "./pch.h"
 #include "./ts_def.h"
-#include <chrono>
-#include <functional>
-#include <mutex>
-#include <queue>
-#include <string>
-#include <thread>
-
-#define PCRE2_CODE_UNIT_WIDTH 8
-#define PCRE_WORKSPACE_SIZE 512

 template <typename T> struct Queue {
  std::queue<T> q;
@@ -20,6 +12,10 @@ template <typename T> struct Queue {
    std::lock_guard<std::mutex> lock(m);
    q.push(val);
  }
+  T front() {
+    std::lock_guard<std::mutex> lock(m);
+    return q.front();
+  }
  bool pop(T &val) {
    std::lock_guard<std::mutex> lock(m);
    if (q.empty())
@@ -28,6 +24,10 @@ template <typename T> struct Queue {
    q.pop();
    return true;
  }
+  void pop() {
+    std::lock_guard<std::mutex> lock(m);
+    q.pop();
+  }
  bool empty() {
    std::lock_guard<std::mutex> lock(m);
    return q.empty();
@@ -52,6 +52,7 @@ struct Coord {
  bool operator>=(const Coord &other) const { return !(*this < other); }
 };

+std::string path_to_file_uri(const std::string &path_str);
 int display_width(const char *str, size_t len);
 uint32_t get_visual_col_from_bytes(const char *line, uint32_t len,
                                   uint32_t byte_limit);
--- a/src/editor.cc
+++ b/src/editor.cc
@@ -2,10 +2,10 @@ extern "C" {
 #include "../libs/libgrapheme/grapheme.h"
 }
 #include "../include/editor.h"
+#include "../include/lsp.h"
 #include "../include/main.h"
 #include "../include/ts.h"
 #include "../include/utils.h"
-#include <cmath>

 Editor *new_editor(const char *filename, Coord position, Coord size) {
  Editor *editor = new Editor();
@@ -18,23 +18,26 @@ Editor *new_editor(const char *filename, Coord position, Coord size) {
    return nullptr;
  }
  editor->filename = filename;
+  editor->uri = path_to_file_uri(filename);
  editor->position = position;
  editor->size = size;
  editor->cursor_preffered = UINT32_MAX;
  editor->root = load(str, len, optimal_chunk_size(len));
  free(str);
  if (len <= (1024 * 128)) {
-    editor->parser = ts_parser_new();
    Language language = language_for_file(filename);
+    editor->parser = ts_parser_new();
    editor->language = language.fn();
    ts_parser_set_language(editor->parser, editor->language);
-    std::string query = get_exe_dir() + "/../grammar/" + language.name + ".scm";
-    editor->query = load_query(query.c_str(), editor);
+    editor->query_file =
+        get_exe_dir() + "/../grammar/" + language.name + ".scm";
+    request_add_to_lsp(language, editor);
  }
  return editor;
 }

 void free_editor(Editor *editor) {
+  remove_from_lsp(editor);
  ts_parser_delete(editor->parser);
  if (editor->tree)
    ts_tree_delete(editor->tree);
@@ -143,7 +146,6 @@ void render_editor(Editor *editor) {
  auto ai_line_span = [&](const VAI &ai,
                          uint32_t n) -> std::pair<const char *, uint32_t> {
    const char *p = ai.text;
-    uint32_t remaining = ai.len;
    uint32_t line_no = 0;
    const char *start = p;
    uint32_t len = 0;
--- a/src/editor_ctrl.cc
+++ b/src/editor_ctrl.cc
@@ -4,7 +4,6 @@ extern "C" {
 #include "../include/editor.h"
 #include "../include/main.h"
 #include "../include/utils.h"
-#include <cmath>

 uint32_t scan_left(const char *line, uint32_t len, uint32_t off) {
  if (off > len)
@@ -214,328 +213,6 @@ Coord editor_hit_test(Editor *editor, uint32_t x, uint32_t y) {
  return {last_line_index, last_col};
 }

-Coord move_right_pure(Editor *editor, Coord cursor, uint32_t number) {
-  Coord result = cursor;
-  if (!editor || !editor->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);
-  if (!it)
-    return result;
-  char *line = next_line(it, &line_len);
-  if (!line) {
-    free(it->buffer);
-    free(it);
-    return result;
-  }
-  if (line_len > 0 && line[line_len - 1] == '\n')
-    --line_len;
-  while (number > 0) {
-    if (col >= line_len) {
-      uint32_t next_row = row + 1;
-      if (next_row >= editor->root->line_count) {
-        col = line_len;
-        break;
-      }
-      row = next_row;
-      col = 0;
-      line = next_line(it, &line_len);
-      if (!line)
-        break;
-      if (line_len > 0 && line[line_len - 1] == '\n')
-        --line_len;
-    } else {
-      uint32_t inc =
-          grapheme_next_character_break_utf8(line + col, line_len - col);
-      if (inc == 0)
-        break;
-      col += inc;
-    }
-    number--;
-  }
-  free(it->buffer);
-  free(it);
-  result.row = row;
-  result.col = col;
-  return result;
-}
-
-Coord move_left_pure(Editor *editor, Coord cursor, uint32_t number) {
-  Coord result = cursor;
-  if (!editor || !editor->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);
-  char *line = next_line(it, &len);
-  if (!line) {
-    free(it->buffer);
-    free(it);
-    return result;
-  }
-  if (len > 0 && line[len - 1] == '\n')
-    --len;
-  bool iterator_ahead = true;
-  while (number > 0) {
-    if (col == 0) {
-      if (row == 0)
-        break;
-      if (iterator_ahead) {
-        prev_line(it, nullptr);
-        iterator_ahead = false;
-      }
-      line = nullptr;
-      row--;
-      line = prev_line(it, &len);
-      if (!line)
-        break;
-      if (len > 0 && line[len - 1] == '\n')
-        --len;
-      col = len;
-    } else {
-      uint32_t new_col = 0;
-      while (new_col < col) {
-        uint32_t inc =
-            grapheme_next_character_break_utf8(line + new_col, len - new_col);
-        if (new_col + inc >= col)
-          break;
-        new_col += inc;
-      }
-      col = new_col;
-    }
-    number--;
-  }
-  free(it->buffer);
-  free(it);
-  result.row = row;
-  result.col = col;
-  return result;
-}
-
-Coord move_right(Editor *editor, Coord cursor, uint32_t number) {
-  Coord result = cursor;
-  if (!editor || !editor->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);
-  if (!it)
-    return result;
-  uint32_t target_row = next_unfolded_row(editor, row);
-  while (row < target_row) {
-    if (!next_line(it, &line_len)) {
-      free(it->buffer);
-      free(it);
-      return result;
-    }
-    ++row;
-  }
-  char *line = next_line(it, &line_len);
-  if (!line) {
-    free(it->buffer);
-    free(it);
-    return result;
-  }
-  if (line_len > 0 && line[line_len - 1] == '\n')
-    --line_len;
-  while (number > 0) {
-    if (col >= line_len) {
-      uint32_t next_row = next_unfolded_row(editor, row + 1);
-      if (next_row >= editor->root->line_count) {
-        col = line_len;
-        break;
-      }
-      while (row < next_row) {
-        line = next_line(it, &line_len);
-        if (!line) {
-          free(it->buffer);
-          free(it);
-          result.row = row;
-          result.col = col;
-          return result;
-        }
-        ++row;
-      }
-      if (line_len > 0 && line[line_len - 1] == '\n')
-        --line_len;
-      col = 0;
-      --number;
-      continue;
-    } else {
-      uint32_t inc =
-          grapheme_next_character_break_utf8(line + col, line_len - col);
-      if (inc == 0)
-        break;
-      col += inc;
-      --number;
-    }
-  }
-  free(it->buffer);
-  free(it);
-  result.row = row;
-  result.col = col;
-  return result;
-}
-
-Coord move_left(Editor *editor, Coord cursor, uint32_t number) {
-  Coord result = cursor;
-  if (!editor || !editor->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);
-  char *line = next_line(it, &len);
-  if (!line) {
-    free(it->buffer);
-    free(it);
-    return result;
-  }
-  if (len > 0 && line[len - 1] == '\n')
-    --len;
-  bool iterator_ahead = true;
-  while (number > 0) {
-    if (col == 0) {
-      if (row == 0)
-        break;
-      if (iterator_ahead) {
-        prev_line(it, nullptr);
-        iterator_ahead = false;
-      }
-      line = nullptr;
-      while (row > 0) {
-        row--;
-        line = prev_line(it, &len);
-        if (!line)
-          break;
-        const Fold *fold = fold_for_line(editor->folds, row);
-        if (fold) {
-          while (line && row > fold->start) {
-            line = prev_line(it, &len);
-            row--;
-          }
-          line = nullptr;
-          continue;
-        }
-        break;
-      }
-      if (!line)
-        break;
-      if (len > 0 && line[len - 1] == '\n')
-        --len;
-      col = len;
-    } else {
-      uint32_t new_col = 0;
-      while (new_col < col) {
-        uint32_t inc =
-            grapheme_next_character_break_utf8(line + new_col, len - new_col);
-        if (new_col + inc >= col)
-          break;
-        new_col += inc;
-      }
-      col = new_col;
-    }
-    number--;
-  }
-  free(it->buffer);
-  free(it);
-  result.row = row;
-  result.col = col;
-  return result;
-}
-
-void cursor_down(Editor *editor, uint32_t number) {
-  if (!editor || !editor->root || number == 0)
-    return;
-  uint32_t len;
-  LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
-  char *line_content = next_line(it, &len);
-  if (line_content == nullptr)
-    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;
-  free(it->buffer);
-  free(it);
-  uint32_t target_row = editor->cursor.row;
-  while (number > 0 && target_row < editor->root->line_count - 1) {
-    target_row = next_unfolded_row(editor, target_row + 1);
-    if (target_row >= editor->root->line_count) {
-      target_row = editor->root->line_count - 1;
-      break;
-    }
-    number--;
-  }
-  it = begin_l_iter(editor->root, target_row);
-  line_content = next_line(it, &len);
-  if (!line_content)
-    return;
-  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);
-  free(it->buffer);
-  free(it);
-}
-
-void cursor_up(Editor *editor, uint32_t number) {
-  if (!editor || !editor->root || number == 0 || editor->cursor.row == 0)
-    return;
-  uint32_t len;
-  LineIterator *it = begin_l_iter(editor->root, editor->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;
-  free(it->buffer);
-  free(it);
-  uint32_t target_row = editor->cursor.row;
-  while (number > 0 && target_row > 0) {
-    target_row = prev_unfolded_row(editor, target_row - 1);
-    if (target_row == 0) {
-      number--;
-      break;
-    }
-    number--;
-  }
-  it = begin_l_iter(editor->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);
-  } else {
-    editor->cursor.row = 0;
-    editor->cursor.col = 0;
-  }
-  free(it->buffer);
-  free(it);
-}
-
-void cursor_right(Editor *editor, uint32_t number) {
-  if (!editor || !editor->root || number == 0)
-    return;
-  editor->cursor = move_right(editor, editor->cursor, number);
-  editor->cursor_preffered = UINT32_MAX;
-}
-
-void cursor_left(Editor *editor, uint32_t number) {
-  if (!editor || !editor->root || number == 0)
-    return;
-  editor->cursor = move_left(editor, editor->cursor, number);
-  editor->cursor_preffered = UINT32_MAX;
-}
-
 void move_line_up(Editor *editor) {
  if (!editor || !editor->root || editor->cursor.row == 0)
    return;
--- a/src/editor_cursor.cc
+++ b/src/editor_cursor.cc
@@ -0,0 +1,327 @@
+extern "C" {
+#include "../libs/libgrapheme/grapheme.h"
+}
+#include "../include/editor.h"
+#include "../include/utils.h"
+
+Coord move_right_pure(Editor *editor, Coord cursor, uint32_t number) {
+  Coord result = cursor;
+  if (!editor || !editor->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);
+  if (!it)
+    return result;
+  char *line = next_line(it, &line_len);
+  if (!line) {
+    free(it->buffer);
+    free(it);
+    return result;
+  }
+  if (line_len > 0 && line[line_len - 1] == '\n')
+    --line_len;
+  while (number > 0) {
+    if (col >= line_len) {
+      uint32_t next_row = row + 1;
+      if (next_row >= editor->root->line_count) {
+        col = line_len;
+        break;
+      }
+      row = next_row;
+      col = 0;
+      line = next_line(it, &line_len);
+      if (!line)
+        break;
+      if (line_len > 0 && line[line_len - 1] == '\n')
+        --line_len;
+    } else {
+      uint32_t inc =
+          grapheme_next_character_break_utf8(line + col, line_len - col);
+      if (inc == 0)
+        break;
+      col += inc;
+    }
+    number--;
+  }
+  free(it->buffer);
+  free(it);
+  result.row = row;
+  result.col = col;
+  return result;
+}
+
+Coord move_left_pure(Editor *editor, Coord cursor, uint32_t number) {
+  Coord result = cursor;
+  if (!editor || !editor->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);
+  char *line = next_line(it, &len);
+  if (!line) {
+    free(it->buffer);
+    free(it);
+    return result;
+  }
+  if (len > 0 && line[len - 1] == '\n')
+    --len;
+  bool iterator_ahead = true;
+  while (number > 0) {
+    if (col == 0) {
+      if (row == 0)
+        break;
+      if (iterator_ahead) {
+        prev_line(it, nullptr);
+        iterator_ahead = false;
+      }
+      line = nullptr;
+      row--;
+      line = prev_line(it, &len);
+      if (!line)
+        break;
+      if (len > 0 && line[len - 1] == '\n')
+        --len;
+      col = len;
+    } else {
+      uint32_t new_col = 0;
+      while (new_col < col) {
+        uint32_t inc =
+            grapheme_next_character_break_utf8(line + new_col, len - new_col);
+        if (new_col + inc >= col)
+          break;
+        new_col += inc;
+      }
+      col = new_col;
+    }
+    number--;
+  }
+  free(it->buffer);
+  free(it);
+  result.row = row;
+  result.col = col;
+  return result;
+}
+
+Coord move_right(Editor *editor, Coord cursor, uint32_t number) {
+  Coord result = cursor;
+  if (!editor || !editor->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);
+  if (!it)
+    return result;
+  uint32_t target_row = next_unfolded_row(editor, row);
+  while (row < target_row) {
+    if (!next_line(it, &line_len)) {
+      free(it->buffer);
+      free(it);
+      return result;
+    }
+    ++row;
+  }
+  char *line = next_line(it, &line_len);
+  if (!line) {
+    free(it->buffer);
+    free(it);
+    return result;
+  }
+  if (line_len > 0 && line[line_len - 1] == '\n')
+    --line_len;
+  while (number > 0) {
+    if (col >= line_len) {
+      uint32_t next_row = next_unfolded_row(editor, row + 1);
+      if (next_row >= editor->root->line_count) {
+        col = line_len;
+        break;
+      }
+      while (row < next_row) {
+        line = next_line(it, &line_len);
+        if (!line) {
+          free(it->buffer);
+          free(it);
+          result.row = row;
+          result.col = col;
+          return result;
+        }
+        ++row;
+      }
+      if (line_len > 0 && line[line_len - 1] == '\n')
+        --line_len;
+      col = 0;
+      --number;
+      continue;
+    } else {
+      uint32_t inc =
+          grapheme_next_character_break_utf8(line + col, line_len - col);
+      if (inc == 0)
+        break;
+      col += inc;
+      --number;
+    }
+  }
+  free(it->buffer);
+  free(it);
+  result.row = row;
+  result.col = col;
+  return result;
+}
+
+Coord move_left(Editor *editor, Coord cursor, uint32_t number) {
+  Coord result = cursor;
+  if (!editor || !editor->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);
+  char *line = next_line(it, &len);
+  if (!line) {
+    free(it->buffer);
+    free(it);
+    return result;
+  }
+  if (len > 0 && line[len - 1] == '\n')
+    --len;
+  bool iterator_ahead = true;
+  while (number > 0) {
+    if (col == 0) {
+      if (row == 0)
+        break;
+      if (iterator_ahead) {
+        prev_line(it, nullptr);
+        iterator_ahead = false;
+      }
+      line = nullptr;
+      while (row > 0) {
+        row--;
+        line = prev_line(it, &len);
+        if (!line)
+          break;
+        const Fold *fold = fold_for_line(editor->folds, row);
+        if (fold) {
+          while (line && row > fold->start) {
+            line = prev_line(it, &len);
+            row--;
+          }
+          line = nullptr;
+          continue;
+        }
+        break;
+      }
+      if (!line)
+        break;
+      if (len > 0 && line[len - 1] == '\n')
+        --len;
+      col = len;
+    } else {
+      uint32_t new_col = 0;
+      while (new_col < col) {
+        uint32_t inc =
+            grapheme_next_character_break_utf8(line + new_col, len - new_col);
+        if (new_col + inc >= col)
+          break;
+        new_col += inc;
+      }
+      col = new_col;
+    }
+    number--;
+  }
+  free(it->buffer);
+  free(it);
+  result.row = row;
+  result.col = col;
+  return result;
+}
+
+void cursor_down(Editor *editor, uint32_t number) {
+  if (!editor || !editor->root || number == 0)
+    return;
+  uint32_t len;
+  LineIterator *it = begin_l_iter(editor->root, editor->cursor.row);
+  char *line_content = next_line(it, &len);
+  if (line_content == nullptr)
+    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;
+  free(it->buffer);
+  free(it);
+  uint32_t target_row = editor->cursor.row;
+  while (number > 0 && target_row < editor->root->line_count - 1) {
+    target_row = next_unfolded_row(editor, target_row + 1);
+    if (target_row >= editor->root->line_count) {
+      target_row = editor->root->line_count - 1;
+      break;
+    }
+    number--;
+  }
+  it = begin_l_iter(editor->root, target_row);
+  line_content = next_line(it, &len);
+  if (!line_content)
+    return;
+  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);
+  free(it->buffer);
+  free(it);
+}
+
+void cursor_up(Editor *editor, uint32_t number) {
+  if (!editor || !editor->root || number == 0 || editor->cursor.row == 0)
+    return;
+  uint32_t len;
+  LineIterator *it = begin_l_iter(editor->root, editor->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;
+  free(it->buffer);
+  free(it);
+  uint32_t target_row = editor->cursor.row;
+  while (number > 0 && target_row > 0) {
+    target_row = prev_unfolded_row(editor, target_row - 1);
+    if (target_row == 0) {
+      number--;
+      break;
+    }
+    number--;
+  }
+  it = begin_l_iter(editor->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);
+  } else {
+    editor->cursor.row = 0;
+    editor->cursor.col = 0;
+  }
+  free(it->buffer);
+  free(it);
+}
+
+void cursor_right(Editor *editor, uint32_t number) {
+  if (!editor || !editor->root || number == 0)
+    return;
+  editor->cursor = move_right(editor, editor->cursor, number);
+  editor->cursor_preffered = UINT32_MAX;
+}
+
+void cursor_left(Editor *editor, uint32_t number) {
+  if (!editor || !editor->root || number == 0)
+    return;
+  editor->cursor = move_left(editor, editor->cursor, number);
+  editor->cursor_preffered = UINT32_MAX;
+}
--- a/src/editor_events.cc
+++ b/src/editor_events.cc
@@ -535,6 +535,8 @@ static Highlight HL_UNDERLINE = {0, 0, 1 << 2, 100};
 void editor_worker(Editor *editor) {
  if (!editor || !editor->root)
    return;
+  if (editor->query_file != "" && !editor->query)
+    editor->query = load_query(editor->query_file.c_str(), editor);
  if (editor->parser && editor->query)
    ts_collect_spans(editor);
  uint32_t prev_col, next_col;
--- a/src/lsp.cc
+++ b/src/lsp.cc
@@ -0,0 +1,345 @@
+#include "../include/lsp.h"
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/poll.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+std::shared_mutex active_lsps_mtx;
+std::unordered_map<uint8_t, LSPInstance *> active_lsps;
+
+Queue<LSPOpenRequest> lsp_open_queue;
+
+std::unordered_map<uint8_t, LSP> lsp_map = {
+    {
+        1,
+        {"clangd",
+         {
+             "clangd",
+             "--background-index",
+             "--clang-tidy",
+             "--completion-style=detailed",
+             "--header-insertion=iwyu",
+             "--log=error",
+             nullptr,
+         }},
+    },
+};
+
+static bool init_lsp(LSPInstance *lsp) {
+  log("starting %s\n", lsp->lsp->command);
+  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[1]);
+    close(out_pipe[0]);
+    execvp(lsp->lsp->command, (char *const *)(lsp->lsp->args.data()));
+    perror("execvp");
+    return false;
+  }
+  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;
+}
+
+LSPInstance *get_or_init_lsp(uint8_t lsp_id) {
+  std::unique_lock lock(active_lsps_mtx);
+  auto it = active_lsps.find(lsp_id);
+  if (it == active_lsps.end()) {
+    auto map_it = lsp_map.find(lsp_id);
+    if (map_it == lsp_map.end())
+      return nullptr;
+    LSPInstance *lsp = new LSPInstance();
+    lsp->lsp = &map_it->second;
+    if (!init_lsp(lsp)) {
+      delete lsp;
+      return nullptr;
+    }
+    LSPPending *pending = new LSPPending();
+    pending->method = "initialize";
+    pending->editor = nullptr;
+    pending->callback = [lsp]([[maybe_unused]] Editor *_e,
+                              [[maybe_unused]] std::string _m,
+                              [[maybe_unused]] json _j) {
+      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://" + std::filesystem::current_path().string()},
+          {"capabilities", json::object()}}}};
+    lsp_send(lsp, init_message, pending);
+    active_lsps[lsp_id] = lsp;
+    return lsp;
+  }
+  return it->second;
+}
+
+void lsp_send(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);
+}
+
+void close_lsp(uint8_t lsp_id) {
+  std::shared_lock active_lsps_lock(active_lsps_mtx);
+  auto it = active_lsps.find(lsp_id);
+  if (it == active_lsps.end())
+    return;
+  LSPInstance *lsp = it->second;
+  active_lsps_lock.unlock();
+  LSPPending *shutdown_pending = new LSPPending();
+  shutdown_pending->method = "shutdown";
+  shutdown_pending->callback = [lsp, lsp_id](Editor *, std::string, json) {
+    json exit = {{"jsonrpc", "2.0"}, {"method", "exit"}};
+    lsp_send(lsp, exit, nullptr);
+  };
+  json shutdown = {{"jsonrpc", "2.0"}, {"method", "shutdown"}};
+  lsp_send(lsp, shutdown, shutdown_pending);
+  std::thread t([lsp, lsp_id] {
+    std::this_thread::sleep_for(100ms);
+    std::unique_lock active_lsps_lock(active_lsps_mtx);
+    std::unique_lock lock(lsp->mtx);
+    if (kill(lsp->pid, 0) == 0)
+      kill(lsp->pid, SIGKILL);
+    waitpid(lsp->pid, nullptr, 0);
+    close(lsp->stdin_fd);
+    close(lsp->stdout_fd);
+    while (!lsp->outbox.empty())
+      lsp->outbox.pop();
+    while (!lsp->inbox.empty())
+      lsp->inbox.pop();
+    for (auto &kv : lsp->pending)
+      delete kv.second;
+    delete lsp;
+    active_lsps.erase(lsp_id);
+  });
+  t.detach();
+}
+
+static 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(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::shared_lock active_lsps_lock(active_lsps_mtx);
+  for (auto &kv : active_lsps) {
+    LSPInstance *lsp = kv.second;
+    std::unique_lock lock(lsp->mtx);
+    while (!lsp->outbox.empty()) {
+      json message;
+      message = lsp->outbox.front();
+      if (!lsp->initialized) {
+        std::string m = message.value("method", "");
+        if (m != "initialize")
+          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) {
+        ssize_t written = write(lsp->stdin_fd, ptr, remaining);
+        if (written == 0)
+          break;
+        else if (written == -1) {
+          if (errno == EINTR)
+            continue;
+          perror("write");
+          break;
+        } else {
+          ptr += written;
+          remaining -= written;
+        }
+      }
+    }
+    pollfd pfd{lsp->stdout_fd, POLLIN, 0};
+    while (poll(&pfd, 1, 0) > 0) {
+      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, pend->method, *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();
+      }
+    }
+  }
+}
+
+void request_add_to_lsp(Language language, Editor *editor) {
+  lsp_open_queue.push({language, editor});
+}
+
+void add_to_lsp(Language language, Editor *editor) {
+  LSPInstance *lsp = get_or_init_lsp(language.lsp_id);
+  if (!lsp)
+    return;
+  std::unique_lock lock(lsp->mtx);
+  if (editor->lsp == lsp)
+    return;
+  lsp->editors.push_back(editor);
+  lock.unlock();
+  std::unique_lock lock2(editor->lsp_mtx);
+  editor->lsp = lsp;
+  lock2.unlock();
+  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 uint8_t find_lsp_id(LSPInstance *needle) {
+  for (const auto &[id, lsp] : active_lsps)
+    if (lsp == needle)
+      return id;
+  return 0;
+}
+
+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);
+  uint8_t lsp_id = find_lsp_id(lsp);
+  if (lsp_id && lsp->editors.empty())
+    close_lsp(lsp_id);
+}
+
+void lsp_handle([[maybe_unused]] LSPInstance *lsp, 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());
+    }
+  }
+}
--- a/src/main.cc
+++ b/src/main.cc
@@ -1,5 +1,6 @@
 #include "../include/main.h"
 #include "../include/editor.h"
+#include "../include/lsp.h"
 #include "../include/ts.h"
 #include "../include/ui.h"
 #include <atomic>
@@ -7,8 +8,6 @@
 #include <sys/ioctl.h>
 #include <thread>

-using namespace std::chrono_literals;
-
 std::atomic<bool> running{true};
 Queue<KeyEvent> event_queue;
 std::vector<Editor *> editors;
@@ -18,7 +17,12 @@ uint8_t mode = NORMAL;

 void background_worker() {
  while (running)
-    throttle(16ms, editor_worker, editors[current_editor]);
+    throttle(8ms, editor_worker, editors[current_editor]);
+}
+
+void background_lsp() {
+  while (running)
+    throttle(8ms, lsp_worker);
 }

 void input_listener() {
@@ -71,6 +75,7 @@ int main(int argc, char *argv[]) {

  std::thread input_thread(input_listener);
  std::thread work_thread(background_worker);
+  std::thread lsp_thread(background_lsp);

  while (running) {
    KeyEvent event;
@@ -98,9 +103,22 @@ int main(int argc, char *argv[]) {
  if (work_thread.joinable())
    work_thread.join();

+  if (lsp_thread.joinable())
+    lsp_thread.join();
+
  end_screen();

-  free_editor(editor);
+  for (auto editor : editors)
+    free_editor(editor);
+
+  while (true) {
+    std::unique_lock lk(active_lsps_mtx);
+    if (active_lsps.empty())
+      break;
+    lk.unlock();
+    throttle(16ms, lsp_worker);
+  }
+
  clear_regex_cache();
  return 0;
 }
--- a/src/renderer.cc
+++ b/src/renderer.cc
@@ -1,4 +1,3 @@
-// includes
 #include "../include/ui.h"

 uint32_t rows, cols;
--- a/src/utils.cc
+++ b/src/utils.cc
@@ -4,11 +4,13 @@ extern "C" {
 }
 #include "../include/utils.h"
 #include <algorithm>
+#include <cctype>
 #include <cstdarg>
 #include <cstdint>
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
+#include <filesystem>
 #include <fstream>
 #include <limits.h>
 #include <magic.h>
@@ -17,6 +19,29 @@ extern "C" {
 #include <unistd.h>
 #include <unordered_map>

+static std::string percent_encode(const std::string &s) {
+  static const char *hex = "0123456789ABCDEF";
+  std::string out;
+  for (unsigned char c : s) {
+    if (std::isalnum(c) || c == '-' || c == '_' || c == '.' || c == '~' ||
+        c == '/') {
+      out.push_back(c);
+    } else {
+      out.push_back('%');
+      out.push_back(hex[c >> 4]);
+      out.push_back(hex[c & 0xF]);
+    }
+  }
+  return out;
+}
+
+std::string path_to_file_uri(const std::string &path_str) {
+  namespace fs = std::filesystem;
+  fs::path p = fs::weakly_canonical(fs::absolute(fs::path(path_str)));
+  std::string generic = p.generic_string();
+  return "file://" + percent_encode(generic);
+}
+
 uint64_t fnv1a_64(const char *s, size_t len) {
  uint64_t hash = 1469598103934665603ull;
  for (size_t i = 0; i < len; ++i) {
@@ -234,14 +259,14 @@ char *detect_file_type(const char *filename) {
 static const std::unordered_map<std::string, Language> ext_map = {
    {"sh", {"bash", tree_sitter_bash}},
    {"bash", {"bash", tree_sitter_bash}},
-    {"c", {"c", tree_sitter_c}},
-    {"cpp", {"cpp", tree_sitter_cpp}},
-    {"cxx", {"cpp", tree_sitter_cpp}},
-    {"cc", {"cpp", tree_sitter_cpp}},
-    {"hpp", {"cpp", tree_sitter_cpp}},
-    {"hh", {"cpp", tree_sitter_cpp}},
-    {"hxx", {"cpp", tree_sitter_cpp}},
-    {"h", {"cpp", tree_sitter_cpp}},
+    {"c", {"c", tree_sitter_c, 1}},
+    {"cpp", {"cpp", tree_sitter_cpp, 1}},
+    {"cxx", {"cpp", tree_sitter_cpp, 1}},
+    {"cc", {"cpp", tree_sitter_cpp, 1}},
+    {"hpp", {"cpp", tree_sitter_cpp, 1}},
+    {"hh", {"cpp", tree_sitter_cpp, 1}},
+    {"hxx", {"cpp", tree_sitter_cpp, 1}},
+    {"h", {"cpp", tree_sitter_cpp, 1}},
    {"css", {"css", tree_sitter_css}},
    {"fish", {"fish", tree_sitter_fish}},
    {"go", {"go", tree_sitter_go}},
@@ -258,8 +283,8 @@ static const std::unordered_map<std::string, Language> ext_map = {
 };

 static const std::unordered_map<std::string, Language> mime_map = {
-    {"text/x-c", {"c", tree_sitter_c}},
-    {"text/x-c++", {"cpp", tree_sitter_cpp}},
+    {"text/x-c", {"c", tree_sitter_c, 1}},
+    {"text/x-c++", {"cpp", tree_sitter_cpp, 1}},
    {"text/x-shellscript", {"bash", tree_sitter_bash}},
    {"application/json", {"json", tree_sitter_json}},
    {"text/javascript", {"javascript", tree_sitter_javascript}},