Implement window title stack

Used by new versions of vim

kitty/client.py

@@ -122,6 +122,10 @@ def draw(*a):
     write(' '.join(a))
 
 
+def screen_manipulate_title_stack(op, which):
+    write(CSI + '%d;%dt' % (op, which))
+
+
 def report_device_attributes(mode, char):
     x = CSI
     if char:

kitty/parser.c

@@ -703,21 +703,29 @@ dispatch_csi(Screen *screen, PyObject DUMP_UNUSED *dump_callback) {
             REPORT_ERROR("Unknown CSI s sequence with start and end modifiers: '%c' '%c' and %u parameters", start_modifier, end_modifier, num_params);
             break;
         case 't':
-            if (!start_modifier && !end_modifier && num_params == 1) {
+            if (!num_params) {
+                REPORT_ERROR("Unknown CSI t sequence with start and end modifiers: '%c' '%c' and no parameters", start_modifier, end_modifier);
+                break;
+            }
+            if (start_modifier || end_modifier) {
+                REPORT_ERROR("Unknown CSI t sequence with start and end modifiers: '%c' '%c', %u parameters and first parameter: %u", start_modifier, end_modifier, num_params, params[0]);
+                break;
+            }
             switch(params[0]) {
                 case 14:
                 case 16:
                 case 18:
                     CALL_CSI_HANDLER1(screen_report_size, 0);
                     break;
+                case 22:
+                case 23:
+                    CALL_CSI_HANDLER2(screen_manipulate_title_stack, 22, 0);
+                    break;
                 default:
-                        REPORT_ERROR("Unknown CSI t sequences with parameter: '%u'", params[0]);
+                    REPORT_ERROR("Unknown CSI t window manipulation sequence with %u parameters and first parameter: %u", num_params, params[0]);
                     break;
             }
             break;
-            }
-            REPORT_ERROR("Unknown CSI t sequence with start and end modifiers: '%c' '%c' and %u parameters", start_modifier, end_modifier, num_params);
-            break;
         case 'u':
             if (!start_modifier && !end_modifier && !num_params) {
                 REPORT_COMMAND(screen_restore_cursor);

kitty/screen.c

@@ -1254,6 +1254,15 @@ screen_report_size(Screen *self, unsigned int which) {
     }
 }
 
+void
+screen_manipulate_title_stack(Screen *self, unsigned int op, unsigned int which) {
+    CALLBACK("manipulate_title_stack", "OOO",
+        op == 23 ? Py_True : Py_False,
+        which == 0 || which == 2 ? Py_True : Py_False,
+        which == 0 || which == 1 ? Py_True : Py_False
+    );
+}
+
 void
 report_device_status(Screen *self, unsigned int which, bool private) {
     // We don't implement the private device status codes, since I haven't come

kitty/screen.h

@@ -191,6 +191,7 @@ bool screen_open_url(Screen*);
 void screen_dirty_sprite_positions(Screen *self);
 void screen_rescale_images(Screen *self);
 void screen_report_size(Screen *, unsigned int which);
+void screen_manipulate_title_stack(Screen *, unsigned int op, unsigned int which);
 void screen_draw_overlay_text(Screen *self, const char *utf8_text);
 #define DECLARE_CH_SCREEN_HANDLER(name) void screen_##name(Screen *screen);
 DECLARE_CH_SCREEN_HANDLER(bell)

kitty/window.py

@@ -110,6 +110,7 @@ class Window:
         self.overlay_for = None
         self.default_title = os.path.basename(child.argv[0] or appname)
         self.child_title = self.default_title
+        self.title_stack = deque(maxlen=10)
         self.allow_remote_control = child.allow_remote_control
         self.id = add_window(tab.os_window_id, tab.id, self.title)
         if not self.id:
@@ -413,6 +414,16 @@ class Window:
                         write('c', set_clipboard_string)
                 if 'write-primary' in self.opts.clipboard_control:
                     write('p', set_primary_selection)
+
+    def manipulate_title_stack(self, pop, title, icon):
+        if title:
+            if pop:
+                if self.title_stack:
+                    self.child_title = self.title_stack.popleft()
+                    self.title_updated()
+            else:
+                if self.child_title:
+                    self.title_stack.append(self.child_title)
     # }}}
 
     def text_for_selection(self):