feat(completion): store received completions in a buffer

src/tui/editor.zig

@@ -273,8 +273,8 @@ pub const Editor = struct {
     pause_undo: bool = false,
     pause_undo_root: ?Buffer.Root = null,
 
-    cursels: CurSel.List,
-    cursels_saved: CurSel.List,
+    cursels: CurSel.List = .empty,
+    cursels_saved: CurSel.List = .empty,
     selection_mode: SelectMode = .char,
     clipboard: ?[]const u8 = null,
     target_column: ?Cursor = null,
@@ -291,7 +291,7 @@ pub const Editor = struct {
         eol_mode: Buffer.EolMode = .lf,
         utf8_sanitized: bool = false,
     } = null,
-    matches: Match.List,
+    matches: Match.List = .empty,
     match_token: usize = 0,
     match_done_token: usize = 0,
     last_find_query: ?[]const u8 = null,
@@ -339,12 +339,14 @@ pub const Editor = struct {
     style_cache: ?StyleCache = null,
     style_cache_theme: []const u8 = "",
 
-    diagnostics: std.ArrayListUnmanaged(Diagnostic),
+    diagnostics: std.ArrayListUnmanaged(Diagnostic) = .empty,
     diag_errors: usize = 0,
     diag_warnings: usize = 0,
     diag_info: usize = 0,
     diag_hints: usize = 0,
 
+    completions: std.ArrayListUnmanaged(u8) = .empty,
+
     need_save_after_filter: ?struct {
         then: ?struct {
             cmd: []const u8,
@@ -452,12 +454,8 @@ pub const Editor = struct {
             .animation_lag = get_animation_max_lag(),
             .animation_frame_rate = frame_rate,
             .animation_last_time = time.microTimestamp(),
-            .cursels = .empty,
-            .cursels_saved = .empty,
-            .matches = .empty,
             .enable_terminal_cursor = tui.config().enable_terminal_cursor,
             .render_whitespace = from_whitespace_mode(tui.config().whitespace_mode),
-            .diagnostics = .empty,
         };
     }
 
@@ -467,6 +465,7 @@ pub const Editor = struct {
         if (self.buffer) |_| self.write_state(meta.writer(self.allocator)) catch {};
         for (self.diagnostics.items) |*d| d.deinit(self.allocator);
         self.diagnostics.deinit(self.allocator);
+        self.completions.deinit(self.allocator);
         if (self.syntax) |syn| syn.destroy(tui.query_cache());
         self.cursels.deinit(self.allocator);
         self.matches.deinit(self.allocator);
@@ -5284,6 +5283,7 @@ pub const Editor = struct {
     pub fn completion(self: *Self, _: Context) Result {
         const file_path = self.file_path orelse return;
         const primary = self.get_primary();
+        self.completions.clearRetainingCapacity();
         return project_manager.completion(file_path, primary.cursor.row, primary.cursor.col);
     }
     pub const completion_meta: Meta = .{ .description = "Language: Show completions at cursor" };
@@ -5481,11 +5481,10 @@ pub const Editor = struct {
     }
 
     pub fn add_completion(self: *Self, row: usize, col: usize, is_incomplete: bool, msg: tp.message) Result {
-        _ = self;
+        try self.completions.appendSlice(self.allocator, msg.buf);
         _ = row;
         _ = col;
         _ = is_incomplete;
-        _ = msg;
     }
 
     pub fn select(self: *Self, ctx: Context) Result {