Allow setting OS window size in session files

docs/changelog.rst

@@ -26,6 +26,8 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
 
 - Allow creating new OS windows in session files (:iss:`1514`)
 
+- Allow setting OS window size in session files
+
 - Allow specifying a value of ``none`` for the :opt:`selection_foreground`
   which will cause kitty to not change text color in selections (:iss:`1358`)
 

docs/index.rst

@@ -345,6 +345,8 @@ For example:
 
     # Create a new OS window
     new_os_window
+    # set new window size to 80x25 cells
+    os_window_size 80c 25c
     launch sh
     # Make the current window the active (focused) window
     focus

kitty/boss.py

@@ -146,7 +146,7 @@ class Boss:
 
     def add_os_window(self, startup_session, 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 self.opts
+            opts_for_size = opts_for_size or startup_session.os_window_size 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(

kitty/session.py

@@ -3,6 +3,7 @@
 # License: GPL v3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 import shlex
+from collections import namedtuple
 
 from .config_data import to_layout_names
 from .constants import shell_path, kitty_exe
@@ -10,6 +11,10 @@ from .layout import all_layouts
 from .utils import log_error
 
 
+WindowSizeOpts = namedtuple(
+    'WindowSizeOpts', 'initial_window_width initial_window_height window_margin_width window_padding_width remember_window_size')
+
+
 class Tab:
 
     def __init__(self, opts, name):
@@ -28,6 +33,7 @@ class Session:
         self.tabs = []
         self.active_tab_idx = 0
         self.default_title = default_title
+        self.os_window_size = None
 
     def add_tab(self, opts, name=''):
         if self.tabs and not self.tabs[-1].windows:
@@ -90,7 +96,7 @@ def parse_session(raw, opts, default_title=None):
     for line in raw.splitlines():
         line = line.strip()
         if line and not line.startswith('#'):
-            cmd, rest = line.partition(' ')[::2]
+            cmd, rest = line.split(maxsplit=1)
             cmd, rest = cmd.strip(), rest.strip()
             if cmd == 'new_tab':
                 ans.add_tab(opts, rest)
@@ -110,6 +116,10 @@ def parse_session(raw, opts, default_title=None):
                 ans.set_cwd(rest)
             elif cmd == 'title':
                 ans.set_next_title(rest)
+            elif cmd == 'os_window_size':
+                from kitty.config_data import window_size
+                w, h = map(window_size, rest.split(maxsplit=1))
+                ans.os_window_size = WindowSizeOpts(w, h, opts.window_margin_width, opts.window_padding_width, False)
             else:
                 raise ValueError('Unknown command in session file: {}'.format(cmd))
     yield finalize_session(ans)