Allow getting the exe name of the active foreground process in the tab title template

kitty/child.py

@@ -444,6 +444,15 @@ class Child:
                 return cwd_of_process(pid) or None
         return None
 
+    def get_foreground_exe(self, oldest: bool = False) -> Optional[str]:
+        with suppress(Exception):
+            pid = self.get_pid_for_cwd(oldest)
+            if pid is not None:
+                c = cmdline_of_pid(pid)
+                if c:
+                    return c[0]
+        return None
+
     @property
     def foreground_cwd(self) -> Optional[str]:
         return self.get_foreground_cwd()

kitty/options/definition.py

@@ -1177,7 +1177,10 @@ use :code:`{sup.index}`. All data available is:
     The number of window groups (not counting overlay windows) in the tab.
 :code:`tab.active_wd`
     The working directory of the currently active window in the tab (expensive,
-    requires syscall).
+    requires syscall). Use :code:`active_oldest_wd` to get the directory of the oldest foreground process rather than the newest.
+:code:`tab.active_exe`
+    The name of the executable running in the foreground of the currently active window in the tab (expensive,
+    requires syscall). Use :code:`active_oldest_exe` for the oldest foreground process.
 :code:`max_title_length`
     The maximum title length available.
 

kitty/tab_bar.py

@@ -188,6 +188,21 @@ class TabAccessor:
         tab = get_boss().tab_for_id(self.tab_id)
         return (tab.get_cwd_of_active_window() if tab else '') or ''
 
+    @property
+    def active_oldest_wd(self) -> str:
+        tab = get_boss().tab_for_id(self.tab_id)
+        return (tab.get_cwd_of_active_window(oldest=True) if tab else '') or ''
+
+    @property
+    def active_exe(self) -> str:
+        tab = get_boss().tab_for_id(self.tab_id)
+        return os.path.basename((tab.get_exe_of_active_window() if tab else '') or '')
+
+    @property
+    def active_oldest_exe(self) -> str:
+        tab = get_boss().tab_for_id(self.tab_id)
+        return os.path.basename((tab.get_exe_of_active_window(oldest=True) if tab else '') or '')
+
 
 safe_builtins = {
     'max': max, 'min': min, 'str': str, 'repr': repr, 'abs': abs, 'len': len, 're': re,

kitty/tabs.py

@@ -235,6 +235,10 @@ class Tab:  # {{{
         w = self.active_window
         return w.get_cwd_of_child(oldest) if w else None
 
+    def get_exe_of_active_window(self, oldest: bool = False) -> Optional[str]:
+        w = self.active_window
+        return w.get_exe_of_child(oldest) if w else None
+
     def set_title(self, title: str) -> None:
         self.name = title or ''
         self.mark_tab_bar_dirty()

kitty/window.py

@@ -1391,6 +1391,9 @@ class Window:
     def get_cwd_of_root_child(self) -> Optional[str]:
         return self.child.current_cwd
 
+    def get_exe_of_child(self, oldest: bool = False) -> str:
+        return self.child.get_foreground_exe(oldest) or self.child.argv[0]
+
     @property
     def cwd_of_child(self) -> Optional[str]:
         return self.get_cwd_of_child()