add cwd to TabBarData

this option add current working directory to the tab by using active windows child directory.

kitty/options/definition.py

@@ -1164,13 +1164,13 @@ optional symbols for bell and activity. If you wish to include the tab-index as
 well, use something like: :code:`{index}:{title}`. Useful if you have shortcuts
 mapped for :code:`goto_tab N`. If you prefer to see the index as a superscript,
 use :code:`{sup.index}`. In addition you can use :code:`{layout_name}` for the
-current layout name, :code:`{num_windows}` for the number of windows in the tab
-and :code:`{num_window_groups}` for the number of window groups (not counting
-overlay windows) in the tab. Note that formatting is done by Python's string
-formatting machinery, so you can use, for instance,
-:code:`{layout_name[:2].upper()}` to show only the first two letters of the
-layout name, upper-cased. If you want to style the text, you can use styling
-directives, for example:
+current layout name, :code:`{num_windows}` for the number of windows in the tab,
+:code:`{num_window_groups}` for the number of window groups (not counting
+overlay windows) in the tab, and {cwd} for current working directory.
+Note that formatting is done by Python's string formatting machinery, so you can
+use, for instance, :code:`{layout_name[:2].upper()}` to show only the first two
+letters of the layout name, upper-cased. If you want to style the text, you can
+use styling directives, for example:
 ``{fmt.fg.red}red{fmt.fg.tab}normal{fmt.bg._00FF00}greenbg{fmt.bg.tab}``.
 Similarly, for bold and italic:
 ``{fmt.bold}bold{fmt.nobold}normal{fmt.italic}italic{fmt.noitalic}``.

kitty/tab_bar.py

@@ -25,6 +25,7 @@ class TabBarData(NamedTuple):
     title: str
     is_active: bool
     needs_attention: bool
+    cwd: str
     num_windows: int
     num_window_groups: int
     layout_name: str
@@ -179,6 +180,7 @@ def draw_title(draw_data: DrawData, screen: Screen, tab: TabBarData, index: int)
         'num_windows': tab.num_windows,
         'num_window_groups': tab.num_window_groups,
         'title': tab.title,
+        'cwd': tab.cwd,
     }
     ColorFormatter.draw_data = draw_data
     ColorFormatter.tab_data = tab
@@ -188,6 +190,7 @@ def draw_title(draw_data: DrawData, screen: Screen, tab: TabBarData, index: int)
         'num_windows': tab.num_windows,
         'num_window_groups': tab.num_window_groups,
         'title': tab.title,
+        'cwd': tab.cwd,
         'fmt': Formatter,
         'sup': SupSub(data),
         'sub': SupSub(data, True),

kitty/tabs.py

@@ -230,6 +230,11 @@ class Tab:  # {{{
                 ans += 1
         return ans
 
+    @property
+    def get_cwd(self) -> str:
+        w = self.active_window
+        return w.cwd_of_child if w and w.cwd_of_child else self.cwd
+
     def set_title(self, title: str) -> None:
         self.name = title or ''
         self.mark_tab_bar_dirty()
@@ -1078,13 +1083,14 @@ class TabManager:  # {{{
             title = (t.name or t.title or appname).strip()
             needs_attention = False
             has_activity_since_last_focus = False
+            cwd = os.path.abspath(t.get_cwd)
             for w in t:
                 if w.needs_attention:
                     needs_attention = True
                 if w.has_activity_since_last_focus:
                     has_activity_since_last_focus = True
             ans.append(TabBarData(
-                title, t is at, needs_attention,
+                title, t is at, needs_attention, cwd,
                 len(t), t.num_window_groups, t.current_layout.name or '',
                 has_activity_since_last_focus, t.active_fg, t.active_bg,
                 t.inactive_fg, t.inactive_bg