Ensure a kitty executable is on PATH even when running from source

__main__.py

@@ -4,8 +4,6 @@
 
 import sys
 
-first_arg = '' if len(sys.argv) < 2 else sys.argv[1]
-
 
 def icat(args):
     from kitty.icat import main
@@ -17,6 +15,8 @@ def list_fonts(args):
     main(args)
 
 
+def main():
+    first_arg = '' if len(sys.argv) < 2 else sys.argv[1]
     if first_arg in ('icat', '+icat'):
         icat(sys.argv[1:])
     elif first_arg in ('list-fonts', '+list-fonts'):
@@ -30,3 +30,7 @@ elif first_arg == '+' and len(sys.argv) > 2:
     else:
         from kitty.main import main
         main()
+
+
+if __name__ == '__main__':
+    main()

kitty/main.py

@@ -109,12 +109,19 @@ def main():
             locale.setlocale(locale.LC_ALL, '')
         except Exception:
             print('Failed to set locale with no LANG, ignoring', file=sys.stderr)
+
+    # Ensure kitty is in PATH
     rpath = getattr(sys, 'bundle_exe_dir', None)
-    if rpath:
-        # Ensure kitty bin directory is in PATH
     items = frozenset(os.environ['PATH'].split(os.pathsep))
-        if rpath not in items:
+    if not rpath:
+        for candidate in items:
+            if os.access(os.path.join(candidate, 'kitty'), os.X_OK):
+                break
+        else:
+            rpath = os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), 'launcher')
+    if rpath and rpath not in items:
         os.environ['PATH'] += os.pathsep + rpath
+
     if os.environ.pop('KITTY_LAUNCHED_BY_LAUNCH_SERVICES',
                       None) == '1' and getattr(sys, 'frozen', True):
         os.chdir(os.path.expanduser('~'))

launcher/kitty

@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+# vim:fileencoding=utf-8
+# License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
+
+import os
+import sys
+
+base = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+sys.path.insert(0, base)
+with open(os.path.join(base, '__main__.py')) as f:
+    src = f.read()
+code = compile(src, f.name, 'exec')
+exec(code, {'__name__': '__main__'})