feat: add toggle_completion_insert_mode command

src/config.zig

@@ -54,6 +54,7 @@ start_debugger_on_crash: bool = false,
 
 completion_trigger: CompletionTrigger = .automatic,
 completion_style: CompletionStyle = .dropdown,
+completion_insert_mode: CompletionInsertMode = .insert,
 
 widget_style: WidgetStyle = .compact,
 palette_style: WidgetStyle = .bars_top_bottom,
@@ -182,6 +183,11 @@ pub const CompletionStyle = enum {
     dropdown,
 };
 
+pub const CompletionInsertMode = enum {
+    insert,
+    replace,
+};
+
 pub const Alignment = enum {
     left,
     right,

src/tui/editor.zig

@@ -6408,6 +6408,19 @@ pub const Editor = struct {
         self.completion_is_complete = is_incomplete;
     }
 
+    pub fn get_completion_replacement_selection(self: *Self, replace: Selection) ?Selection {
+        var sel = replace.from_pos(self.buf_root() catch return null, self.metrics);
+        sel.normalize();
+        const cursor = self.get_primary().cursor;
+        return switch (tui.config().completion_insert_mode) {
+            .insert => if (self.get_primary().cursor.within(sel))
+                .{ .begin = sel.begin, .end = cursor }
+            else
+                sel,
+            .replace => sel,
+        };
+    }
+
     pub fn select(self: *Self, ctx: Context) Result {
         var sel: Selection = .{};
         if (!try ctx.args.match(.{ tp.extract(&sel.begin.row), tp.extract(&sel.begin.col), tp.extract(&sel.end.row), tp.extract(&sel.end.col) }))

src/tui/mode/overlay/completion_dropdown.zig

@@ -276,7 +276,7 @@ fn get_replace_selection(replace: Buffer.Selection) ?Buffer.Selection {
     return if (replace.empty())
         null
     else if (tui.get_active_editor()) |edt|
-        replace.from_pos(edt.buf_root() catch return null, edt.metrics)
+        edt.get_completion_replacement_selection(replace)
     else
         replace;
 }

src/tui/mode/overlay/completion_palette.zig

@@ -205,7 +205,7 @@ fn get_replace_selection(replace: Buffer.Selection) ?Buffer.Selection {
     return if (replace.empty())
         null
     else if (tui.get_active_editor()) |edt|
-        replace.from_pos(edt.buf_root() catch return null, edt.metrics)
+        edt.get_completion_replacement_selection(replace)
     else
         replace;
 }

src/tui/tui.zig

@@ -1150,6 +1150,17 @@ const cmds = struct {
     }
     pub const toggle_completion_trigger_meta: Meta = .{ .description = "Toggle auto completion" };
 
+    pub fn toggle_completion_insert_mode(self: *Self, _: Ctx) Result {
+        self.config_.completion_insert_mode = switch (self.config_.completion_insert_mode) {
+            .insert => .replace,
+            .replace => .insert,
+        };
+        defer self.logger.print("completion insert mode {t}", .{self.config_.completion_insert_mode});
+        try save_config();
+        resize();
+    }
+    pub const toggle_completion_insert_mode_meta: Meta = .{ .description = "Toggle completion insert mode" };
+
     pub fn toggle_keybind_hints(self: *Self, _: Ctx) Result {
         self.hint_mode = switch (self.hint_mode) {
             .all => .prefix,