Look for config file in stabdard location on startup

kitty/constants.py

@@ -2,6 +2,28 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
+import os
+from PyQt5.QtCore import QStandardPaths
+
 appname = 'kitty'
 version = (0, 1, 0)
 str_version = '.'.join(map(str, version))
+
+
+def _get_config_dir():
+    # This must be called before calling setApplicationName
+    if 'KITTY_CONFIG_DIRECTORY' in os.environ:
+        return os.path.abspath(os.path.expanduser(os.environ['VISE_CONFIG_DIRECTORY']))
+
+    candidate = QStandardPaths.writableLocation(QStandardPaths.ConfigLocation)
+    if not candidate:
+        raise RuntimeError(
+            'Failed to find path for application config directory')
+    ans = os.path.join(candidate, appname)
+    try:
+        os.makedirs(ans)
+    except FileExistsError:
+        pass
+    return ans
+config_dir = _get_config_dir()
+del _get_config_dir