Lsp completion logic

include/editor/completions.h

@@ -0,0 +1,44 @@
+#ifndef EDITOR_COMPLETIONS_H
+#define EDITOR_COMPLETIONS_H
+
+#include "editor/decl.h"
+#include "pch.h"
+#include "ui/completionbox.h"
+#include "utils/utils.h"
+
+struct CompletionItem {
+  std::string label;                        // Shown in the autocomplete box
+  uint8_t kind;                             // Function, variable, class, etc.
+  std::optional<std::string> detail;        // Shown greyed in autocomplete box
+  std::optional<std::string> documentation; // Hover box (can be lazy-loaded)
+  bool is_markup = false;
+  bool deprecated = false; // Shown with strikethrough, may push down in list
+  std::string sort;        // Used for sorting
+  std::string filter;      // Used for filtering (default: label)
+  bool snippet = false;
+  std::vector<TextEdit> edits;
+  json original;
+  std::vector<char> end_chars; // Ends completion session if typed
+};
+
+struct CompletionSession {
+  std::shared_mutex mtx;
+
+  bool active = false;
+  Coord hook;                        // set to start of word
+  std::optional<std::string> prefix; // text between hook and cursor
+  uint8_t select = 0; // index of selected item (defualts to preselcted one
+                      // when data requested)
+  std::vector<CompletionItem> items;
+  std::vector<uint8_t> visible;
+  bool complete = true; // If false, client may request more items on filter
+                        // (but doesnt try filtering on its own)
+  std::optional<char> trigger_char; // Character that triggered completion sent
+                                    // to lsp for isIncomplete resolving
+  uint8_t trigger = 0; // Type of trigger (1: manual, 2: trigger char, 3: auto)
+  CompletionBox box;
+
+  CompletionSession() : box(this) {}
+};
+
+#endif

include/editor/decl.h

@@ -3,6 +3,14 @@
 
 #include "utils/utils.h"
 
+struct TextEdit {
+  // NOTE: start.col is in utf16 index and not clusters or utf8
+  Coord start;
+  // NOTE: end.col is in utf16 index and not clusters or utf8
+  Coord end;
+  std::string text;
+};
+
 struct Fold {
   uint32_t start;
   uint32_t end;

include/editor/editor.h

@@ -1,10 +1,12 @@
 #ifndef EDITOR_H
 #define EDITOR_H
 
+#include "editor/completions.h"
 #include "editor/spans.h"
 #include "io/knot.h"
 #include "io/sysio.h"
 #include "ts/decl.h"
+#include "ui/completionbox.h"
 #include "ui/diagnostics.h"
 #include "ui/hover.h"
 #include "utils/utils.h"
@@ -49,6 +51,7 @@ struct Editor {
   bool diagnostics_active;
   DiagnosticBox diagnostics;
   int lsp_version = 1;
+  CompletionSession completion;
 };
 
 Editor *new_editor(const char *filename_arg, Coord position, Coord size);
@@ -73,6 +76,8 @@ void ensure_scroll(Editor *editor);
 void handle_editor_event(Editor *editor, KeyEvent event);
 void edit_erase(Editor *editor, Coord pos, int64_t len);
 void edit_insert(Editor *editor, Coord pos, char *data, uint32_t len);
+void edit_replace(Editor *editor, Coord start, Coord end, const char *text,
+                  uint32_t len);
 Coord editor_hit_test(Editor *editor, uint32_t x, uint32_t y);
 char *get_selection(Editor *editor, uint32_t *out_len, Coord *out_start);
 void editor_worker(Editor *editor);
@@ -90,6 +95,13 @@ 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);
+void apply_lsp_edits(Editor *editor, std::vector<TextEdit> edits);
+void completion_resolve_doc(Editor *editor);
+void complete_accept(Editor *editor);
+void complete_next(Editor *editor);
+void complete_prev(Editor *editor);
+void complete_select(Editor *editor, uint8_t index);
+void handle_completion(Editor *editor, KeyEvent event);
 
 inline void apply_hook_insertion(Editor *editor, uint32_t line, uint32_t rows) {
   for (auto &hook : editor->hooks)