Add an option to set the window title

Fixes #201

CHANGELOG.rst

@@ -29,6 +29,7 @@ version 0.6.0 [future]
 - Add a command line switch to set the name part of the WM_CLASS window
   property independently.
 
+- Add a command line switch to set the window title.
 
 version 0.5.1 [2017-12-01]
 ---------------------------

kitty/cli.py

@@ -25,6 +25,11 @@ condition=not is_macos
 Set the name part of the |_ WM_CLASS| property (defaults to using the value from |_ --class|)
 
 
+--title
+Set the window title. This will override any title set by the program running inside kitty. So
+only use this if you are running a program that does not set titles.
+
+
 --config
 type=list
 default={config_path}
@@ -61,7 +66,8 @@ The window layout to use on startup. Choices are: {window_layout_choices}
 
 
 --session
-Path to a file containing the startup |_ session| (tabs, windows, layout, programs)
+Path to a file containing the startup |_ session| (tabs, windows, layout, programs).
+See the README file for details and an example.
 
 
 --single-instance -1

kitty/session.py

@@ -100,7 +100,11 @@ def create_session(opts, args=None, special_window=None):
     ans.tabs[-1].layout = current_layout
     if special_window is None:
         cmd = args.args if args and args.args else [shell_path]
-        ans.add_window(cmd)
+        if args.title:
+            from kitty.tabs import SpecialWindow
+            ans.add_window(SpecialWindow(cmd, override_title=args.title))
+        else:
+            ans.add_window(cmd)
     else:
         ans.add_special_window(special_window)
     return ans