Allow copying current window/tab/os window titles when creating new ones via the launch command. Fixes #4933

kitty/fast_data_types.pyi

@@ -1361,6 +1361,10 @@ def set_os_window_title(os_window_id: int, title: str) -> None:
     pass
 
 
+def get_os_window_title(os_window_id: int) -> Optional[str]:
+    pass
+
+
 def update_ime_position_for_window(window_id: int, force: bool = False, update_focus: int = 0) -> bool:
     pass
 

kitty/launch.py

@@ -9,7 +9,9 @@ from .child import Child
 from .cli import parse_args
 from .cli_stub import LaunchCLIOptions
 from .constants import kitty_exe, shell_path
-from .fast_data_types import patch_color_profiles, set_clipboard_string
+from .fast_data_types import (
+    get_os_window_title, patch_color_profiles, set_clipboard_string
+)
 from .options.utils import env as parse_env
 from .tabs import Tab, TabManager
 from .types import run_once
@@ -32,12 +34,14 @@ def options_spec() -> str:
     return '''
 --window-title --title
 The title to set for the new window. By default, title is controlled by the
-child process.
+child process. The special value :code:`current` will copy the title from the currently
+active window.
 
 
 --tab-title
 The title for the new tab if launching in a new tab. By default, the title
-of the active window in the tab is used as the tab title.
+of the active window in the tab is used as the tab title. The special value
+:code:`current` will copy the title form the title of the currently active tab.
 
 
 --type
@@ -175,7 +179,8 @@ Set the WM_NAME property on X11 for the newly created OS Window when using
 
 --os-window-title
 Set the title for the newly created OS window. This title will override any
-titles set by programs running in kitty.
+titles set by programs running in kitty. The special value :code:`current`
+will use the title of the current OS Window, if any.
 
 
 --logo
@@ -344,6 +349,14 @@ def launch(
         active_child = active.child
     else:
         active_child = None
+    if opts.window_title == 'current':
+        opts.window_title = active.title if active else None
+    if opts.tab_title == 'current':
+        atab = boss.active_tab
+        opts.tab_title = atab.title if atab else None
+    if opts.os_window_title == 'current':
+        tm = boss.active_tab_manager
+        opts.os_window_title = get_os_window_title(tm.os_window_id) if tm else None
     env = get_env(opts, active_child)
     kw: LaunchKwds = {
         'allow_remote_control': opts.allow_remote_control,

kitty/state.c

@@ -927,12 +927,15 @@ PYWRAP1(sync_os_window_title) {
 
 PYWRAP1(set_os_window_title) {
     id_type os_window_id;
-    const char *title;
-    PA("Ks", &os_window_id, &title);
+    PyObject *title;
+    PA("KU", &os_window_id, &title);
     WITH_OS_WINDOW(os_window_id)
-        if (strlen(title)) {
+        if (PyUnicode_GetLength(title)) {
             os_window->title_is_overriden = true;
-            set_os_window_title(os_window, title);
+            Py_XDECREF(os_window->window_title);
+            os_window->window_title = title;
+            Py_INCREF(title);
+            set_os_window_title(os_window, PyUnicode_AsUTF8(title));
         } else {
             os_window->title_is_overriden = false;
             if (os_window->window_title) set_os_window_title(os_window, PyUnicode_AsUTF8(os_window->window_title));
@@ -942,6 +945,15 @@ PYWRAP1(set_os_window_title) {
     Py_RETURN_NONE;
 }
 
+PYWRAP1(get_os_window_title) {
+    id_type os_window_id;
+    PA("K", &os_window_id);
+    WITH_OS_WINDOW(os_window_id)
+        if (os_window->window_title) return Py_BuildValue("O", os_window->window_title);
+    END_WITH_OS_WINDOW
+    Py_RETURN_NONE;
+}
+
 
 
 PYWRAP1(pt_to_px) {
@@ -1280,6 +1292,7 @@ static PyMethodDef module_methods[] = {
     MW(background_opacity_of, METH_O),
     MW(update_window_visibility, METH_VARARGS),
     MW(sync_os_window_title, METH_VARARGS),
+    MW(get_os_window_title, METH_VARARGS),
     MW(set_os_window_title, METH_VARARGS),
     MW(global_font_size, METH_VARARGS),
     MW(set_background_image, METH_VARARGS),

kitty/window.py

@@ -564,7 +564,7 @@ class Window:
         return dict(
             id=self.id,
             is_focused=is_focused,
-            title=self.override_title or self.title,
+            title=self.title,
             pid=self.child.pid,
             cwd=self.child.current_cwd or self.child.cwd,
             cmdline=self.child.cmdline,