Add API to boss.py to move a window into a different tab

kitty/boss.py

@@ -146,9 +146,9 @@ class Boss:
             from .fast_data_types import cocoa_set_notification_activated_callback
             cocoa_set_notification_activated_callback(self.notification_activated)
 
-    def add_os_window(self, startup_session, os_window_id=None, wclass=None, wname=None, opts_for_size=None, startup_id=None):
+    def add_os_window(self, startup_session=None, os_window_id=None, wclass=None, wname=None, opts_for_size=None, startup_id=None):
         if os_window_id is None:
-            opts_for_size = opts_for_size or startup_session.os_window_size or self.opts
+            opts_for_size = opts_for_size or getattr(startup_session, 'os_window_size', None) or self.opts
             cls = wclass or self.args.cls or appname
             with startup_notification_handler(do_notify=startup_id is not None, startup_id=startup_id) as pre_show_callback:
                 os_window_id = create_os_window(
@@ -1102,3 +1102,30 @@ class Boss:
         opts, items = parse_subcommand_cli(cmd_set_colors, ['set-colors'] + list(args))
         payload = cmd_set_colors(None, opts, items)
         set_colors(self, self.active_window, payload)
+
+    def _move_window_to(self, window=None, target_tab_id=None, target_os_window_id=None):
+        src_tab = self.tab_for_window(window or self.active_window)
+        if src_tab is None:
+            return
+        if target_os_window_id == 'new':
+            target_os_window_id = self.add_os_window()
+            tm = self.os_window_map[target_os_window_id]
+            target_tab = tm.new_tab(empty_tab=True)
+        else:
+            target_os_window_id = target_os_window_id or current_os_window()
+            if target_tab_id == 'new':
+                tm = self.os_window_map[target_os_window_id]
+                target_tab = tm.new_tab(empty_tab=True)
+            else:
+                for tab in self.all_tabs:
+                    if tab.id == target_tab_id:
+                        target_tab = tab
+                        target_os_window_id = tab.os_window_id
+                        break
+                else:
+                    return
+
+        underlaid_window, overlaid_window = src_tab.detach_window(window)
+        target_tab.attach_window(underlaid_window)
+        if overlaid_window:
+            target_tab.attach_window(overlaid_window)

kitty/tabs.py

@@ -38,7 +38,7 @@ def add_active_id_to_history(items, item_id, maxlen=64):
 
 class Tab:  # {{{
 
-    def __init__(self, tab_manager, session_tab=None, special_window=None, cwd_from=None):
+    def __init__(self, tab_manager, session_tab=None, special_window=None, cwd_from=None, no_initial_window=False):
         self._active_window_idx = 0
         self.tab_manager_ref = weakref.ref(tab_manager)
         self.os_window_id = tab_manager.os_window_id
@@ -57,7 +57,9 @@ class Tab:  # {{{
         for i, which in enumerate('first second third fourth fifth sixth seventh eighth ninth tenth'.split()):
             setattr(self, which + '_window', partial(self.nth_window, num=i))
         self._last_used_layout = self._current_layout_name = None
-        if session_tab is None:
+        if no_initial_window:
+            pass
+        elif session_tab is None:
             self.cwd = self.args.directory
             sl = self.enabled_layouts[0]
             self._set_current_layout(sl)
@@ -420,7 +422,7 @@ class Tab:  # {{{
 
 class TabManager:  # {{{
 
-    def __init__(self, os_window_id, opts, args, startup_session):
+    def __init__(self, os_window_id, opts, args, startup_session=None):
         self.os_window_id = os_window_id
         self.last_active_tab_id = None
         self.opts, self.args = opts, args
@@ -430,9 +432,10 @@ class TabManager:  # {{{
         self.tab_bar = TabBar(self.os_window_id, opts)
         self._active_tab_idx = 0
 
-        for t in startup_session.tabs:
-            self._add_tab(Tab(self, session_tab=t))
-        self._set_active_tab(max(0, min(startup_session.active_tab_idx, len(self.tabs) - 1)))
+        if startup_session is not None:
+            for t in startup_session.tabs:
+                self._add_tab(Tab(self, session_tab=t))
+            self._set_active_tab(max(0, min(startup_session.active_tab_idx, len(self.tabs) - 1)))
 
     @property
     def active_tab_idx(self):
@@ -578,10 +581,10 @@ class TabManager:  # {{{
             self._set_active_tab(nidx)
             self.mark_tab_bar_dirty()
 
-    def new_tab(self, special_window=None, cwd_from=None, as_neighbor=False):
+    def new_tab(self, special_window=None, cwd_from=None, as_neighbor=False, empty_tab=False):
         nidx = self.active_tab_idx + 1
         idx = len(self.tabs)
-        self._add_tab(Tab(self, special_window=special_window, cwd_from=cwd_from))
+        self._add_tab(Tab(self, no_initial_window=True) if empty_tab else Tab(self, special_window=special_window, cwd_from=cwd_from))
         self._set_active_tab(idx)
         if len(self.tabs) > 2 and as_neighbor and idx != nidx:
             for i in range(idx, nidx, -1):