Allow hiding the tab bar completely, by setting :opt:tab_bar_style to `hidden`.

Fixes #1014

docs/changelog.rst

@@ -20,6 +20,9 @@ Changelog
   ``goto_tab`` now accepts negative numbers to go to previously active tabs
   (:iss:`1040`)
 
+- Allow hiding the tab bar completely, by setting :opt:`tab_bar_style` to
+  ``hidden``. (:iss:`1014`)
+
 - Fix the ``*_with_cwd`` actions using the cwd of the overlay window rather
   than the underlying window's cwd (:iss:`1045`)
 

kitty/config_data.py

@@ -572,8 +572,8 @@ Which edge to show the tab bar on, top or bottom'''))
 o('tab_bar_margin_width', 0.0, option_type=positive_float, long_text=_('''
 The margin to the left and right of the tab bar (in pts)'''))
 
-o('tab_bar_style', 'fade', option_type=choices('fade', 'separator'), long_text=_('''
-The tab bar style, can be one of: :code:`fade` or :code:`separator`. In the fade style,
+o('tab_bar_style', 'fade', option_type=choices('fade', 'separator', 'hidden'), long_text=_('''
+The tab bar style, can be one of: :code:`fade`, :code:`separator` or :code:`hidden`. In the fade style,
 each tab's edges fade into the background color, in the separator style, tabs are
 separated by a configurable separator.
 '''))

kitty/state.c

@@ -249,7 +249,7 @@ add_borders_rect(id_type os_window_id, id_type tab_id, uint32_t left, uint32_t t
 
 void
 os_window_regions(OSWindow *os_window, Region *central, Region *tab_bar) {
-    if (os_window->num_tabs > 1) {
+    if (!global_state.tab_bar_hidden && os_window->num_tabs > 1) {
         switch(OPT(tab_bar_edge)) {
             case TOP_EDGE:
                 central->left = 0; central->top = os_window->fonts_data->cell_height; central->right = os_window->viewport_width - 1;
@@ -395,6 +395,11 @@ PYWRAP1(set_options) {
     S(macos_hide_from_tasks, PyObject_IsTrue);
     S(macos_thicken_font, PyFloat_AsDouble);
 
+    GA(tab_bar_style); if (!ret) return NULL;
+    global_state.tab_bar_hidden = PyUnicode_CompareWithASCIIString(ret, "hidden") == 0 ? true: false;
+    Py_CLEAR(ret);
+    if (PyErr_Occurred()) return NULL;
+
     PyObject *chars = PyObject_GetAttrString(opts, "select_by_word_characters");
     if (chars == NULL) return NULL;
     for (size_t i = 0; i < MIN((size_t)PyUnicode_GET_LENGTH(chars), sizeof(OPT(select_by_word_characters))/sizeof(OPT(select_by_word_characters[0]))); i++) {

kitty/state.h

@@ -143,6 +143,7 @@ typedef struct {
     bool debug_gl, debug_font_fallback;
     bool has_pending_resizes;
     bool in_sequence_mode;
+    bool tab_bar_hidden;
     double font_sz_in_pts;
     struct { double x, y; } default_dpi;
     id_type active_drag_in_window;

kitty/tabs.py

@@ -358,6 +358,7 @@ class TabManager:  # {{{
         self.os_window_id = os_window_id
         self.last_active_tab_id = None
         self.opts, self.args = opts, args
+        self.tab_bar_hidden = self.opts.tab_bar_style == 'hidden'
         self.tabs = []
         self.active_tab_history = deque()
         self.tab_bar = TabBar(self.os_window_id, opts)
@@ -395,7 +396,8 @@ class TabManager:  # {{{
                     w.focus_changed(True)
 
     def refresh_sprite_positions(self):
-        self.tab_bar.screen.refresh_sprite_positions()
+        if not self.tab_bar_hidden:
+            self.tab_bar.screen.refresh_sprite_positions()
 
     def _add_tab(self, tab):
         before = len(self.tabs)
@@ -415,12 +417,13 @@ class TabManager:  # {{{
         set_active_tab(self.os_window_id, idx)
 
     def tabbar_visibility_changed(self):
-        self.tab_bar.layout()
-        self.resize(only_tabs=True)
-        glfw_post_empty_event()
+        if not self.tab_bar_hidden:
+            self.tab_bar.layout()
+            self.resize(only_tabs=True)
+            glfw_post_empty_event()
 
     def mark_tab_bar_dirty(self):
-        if len(self.tabs) > 1:
+        if len(self.tabs) > 1 and not self.tab_bar_hidden:
             mark_tab_bar_dirty(self.os_window_id)
 
     def update_tab_bar_data(self):
@@ -428,8 +431,9 @@ class TabManager:  # {{{
 
     def resize(self, only_tabs=False):
         if not only_tabs:
-            self.tab_bar.layout()
-            self.mark_tab_bar_dirty()
+            if not self.tab_bar_hidden:
+                self.tab_bar.layout()
+                self.mark_tab_bar_dirty()
         for tab in self.tabs:
             tab.relayout()