Expand environment variables in config file include directives

kitty/config_utils.py

@@ -48,7 +48,7 @@ def parse_line(line, type_map, special_handling, ans, all_keys, base_path_for_in
         if special_handling(key, val, ans):
             return
         if key == 'include':
-            val = val.strip()
+            val = os.path.expandvars(os.path.expanduser(val.strip()))
             if not os.path.isabs(val):
                 val = os.path.join(base_path_for_includes, val)
             try:

kitty/kitty.conf

@@ -2,7 +2,9 @@
 
 # You can include secondary config files via the "include" directive.
 # If you use a relative path for include, it is resolved with respect to the
-# location of the current config file. For example:
+# location of the current config file. Note that environment variables
+# are expanded, so ${USER}.conf becomes name.conf if USER=name
+# For example:
 # include other.conf
 
 # Fonts {{{