Finish serialization to session file

kitty/boss.py

@@ -501,6 +501,16 @@ class Boss:
                         'background_opacity': bo,
                     }
 
+    def serialize_state_as_session(self) -> Iterator[str]:
+        s = {current_focused_os_window_id(): 2, last_focused_os_window_id(): 1}
+
+        def skey(os_window_id: int) -> int:
+            return s.get(os_window_id, 0)
+
+        for os_window_id in sorted(self.os_window_map, key=skey):
+            tm = self.os_window_map[os_window_id]
+            yield from tm.serialize_state_as_session()
+
     @property
     def all_tab_managers(self) -> Iterator[TabManager]:
         yield from self.os_window_map.values()

kitty/tabs.py

@@ -1186,6 +1186,22 @@ class TabManager:  # {{{
             'active_tab_idx': self.active_tab_idx,
         }
 
+    def serialize_state_as_session(self) -> list[str]:
+        tmap = {tab.id: tab for tab in self}
+        ans = []
+        for tab_id in self.active_tab_history:
+            tab = tmap.get(tab_id)
+            if tab is not None:
+                ans.extend(tab.serialize_state_as_session())
+        if ans:
+            prefix = ['new_os_window']
+            if self.wm_class:
+                prefix.append(f'os_window_class {self.wm_class}')
+            if self.wm_name:
+                prefix.append(f'os_window_name {self.wm_name}')
+            ans = prefix + ans
+        return ans
+
     @property
     def active_tab(self) -> Tab | None:
         try: