Show secure input indicator on active tab

docs/changelog.rst

@@ -173,6 +173,11 @@ consumption to do the same tasks.
 Detailed list of changes
 -------------------------------------
 
+0.50.0 [future]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- macOS: Show a key symbol on the active tab if the macOS Secure Input feature is enabled
+
 0.47.2 [2026-06-07]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

kitty/cocoa_window.m

@@ -1412,6 +1412,12 @@ cocoa_clear_dock_badge_if_set(void) {
 
 // }}}
 
+static PyObject*
+cocoa_is_secure_input_enabled(PyObject *self UNUSED, PyObject *args UNUSED) {
+    SecureKeyboardEntryController *k = [SecureKeyboardEntryController sharedInstance];
+    return Py_NewRef(k.isDesired ? Py_True : Py_False);
+}
+
 static PyObject*
 cocoa_get_machine_id(PyObject *self UNUSED, PyObject *args UNUSED) {
     static char ans[1024] = {0};
@@ -1439,6 +1445,7 @@ static PyMethodDef module_methods[] = {
     {"cocoa_play_system_sound_by_id_async", play_system_sound_by_id_async, METH_O, ""},
     {"cocoa_get_lang", (PyCFunction)cocoa_get_lang, METH_NOARGS, ""},
     {"cocoa_get_machine_id", (PyCFunction)cocoa_get_machine_id, METH_NOARGS, ""},
+    {"cocoa_is_secure_input_enabled", (PyCFunction)cocoa_is_secure_input_enabled, METH_NOARGS, ""},
     {"cocoa_set_global_shortcut", (PyCFunction)cocoa_set_global_shortcut, METH_VARARGS, ""},
     {"cocoa_send_notification", (PyCFunction)(void(*)(void))cocoa_send_notification, METH_VARARGS | METH_KEYWORDS, ""},
     {"cocoa_remove_delivered_notification", (PyCFunction)cocoa_remove_delivered_notification, METH_O, ""},

kitty/options/definition.py

@@ -1753,7 +1753,7 @@ A value of zero means that no limit is applied.
 '''
     )
 
-opt('tab_title_template', '"{fmt.fg.red}{bell_symbol}{activity_symbol}{fmt.fg.tab}{tab.last_focused_progress_percent}{title}"',
+opt('tab_title_template', '"{fmt.fg.red}{bell_symbol}{activity_symbol}{secure_input_symbol}{fmt.fg.tab}{tab.last_focused_progress_percent}{title}"',
     option_type='tab_title_template',
     long_text='''
 A template to render the tab title. The default just renders the title with
@@ -1776,6 +1776,8 @@ use :code:`{sup.index}`. All data available is:
     The number of windows in the tab.
 :code:`num_window_groups`
     The number of window groups (a window group is a window and all of its overlay windows) in the tab.
+:code:`secure_input_symbol`
+    A key symbol when secure input is enabled on macOS and the tab is the active tab, empty otherwise.
 :code:`tab.active_wd`
     The working directory of the currently active window in the tab
     (expensive, requires syscall). Use :code:`tab.active_oldest_wd` to get

kitty/tab_bar.py

@@ -12,7 +12,7 @@ from typing import (
 )
 
 from .borders import Border, BorderColor
-from .constants import config_dir
+from .constants import config_dir, is_macos
 from .fast_data_types import (
     BOTTOM_EDGE,
     DECAWM,
@@ -35,6 +35,8 @@ from .types import WindowGeometry, run_once
 from .typing_compat import EdgeLiteral, PowerlineStyle
 from .utils import color_as_int, log_error, sgr_sanitizer_pat
 
+if is_macos:
+    from .fast_data_types import cocoa_is_secure_input_enabled  # type: ignore
 
 class TabBarData(NamedTuple):
     title: str
@@ -268,11 +270,13 @@ def apply_title_template(draw_data: DrawData, tab: TabBarData, index: int, max_t
     if tab.tab_id < 0:
         return tab.title  # synthetic tab — render title literally, skip user template
     ta = TabAccessor(tab.tab_id)
+    si = ('🔑' if cocoa_is_secure_input_enabled() else '') if is_macos and tab.is_active else ''
     data = {
         'index': index,
         'layout_name': tab.layout_name,
         'num_windows': tab.num_windows,
         'num_window_groups': tab.num_window_groups,
+        'secure_input_symbol': si,
         'title': tab.title,
         'tab': ta,
     }