Add load from user config in XDG_CONFIG_HOME if available

auto_cpufreq/bin/auto_cpufreq.py

@@ -28,7 +28,7 @@
 @click.option(
     "--config",
     is_flag=False,
-    default="/etc/auto-cpufreq.conf",
+    required=False,
     help="Use config file at defined path",
 )
 @click.option("--debug", is_flag=True, help="Show debug info (include when submitting bugs)")
@@ -41,8 +41,10 @@ def main(config, daemon, debug, update, install, remove, live, log, monitor, sta
 
     # display info if config file is used
     def config_info_dialog():
-        if get_config(config) and hasattr(get_config, "using_cfg_file"):
-            print("\nUsing settings defined in " + config + " file")
+
+        config_file = find_config_file(config)
+        if get_config(config_file) and hasattr(get_config, "using_cfg_file"):
+            print("\nUsing settings defined in " + config_file + " file")
 
     # set governor override unless None or invalid
     if force is not None:

auto_cpufreq/core.py

@@ -84,6 +84,40 @@ def file_stats():
     auto_cpufreq_stats_file = open(auto_cpufreq_stats_path, "w")
     sys.stdout = auto_cpufreq_stats_file
 
+
+def find_config_file(args_config_file):
+    """
+    Find the config file to use.
+
+    Look for a config file in the following priorization order:
+    1. Command line argument
+    2. User config file
+    3. System config file
+
+    :param args_config_file: Path to the config file provided as a command line argument
+    :return: The path to the config file to use
+    """
+
+    # Prepare paths
+    home = os.getenv("HOME")
+    user_config_dir = os.getenv("XDG_CONFIG_HOME", default=os.path.join(home, ".config"))
+    user_config_file = os.path.join(user_config_dir, "auto-cpufreq/auto-cpufreq.conf")
+    system_config_file = "/etc/auto-cpufreq.conf"
+
+    # If config file is provided as a command line argument but is invalid, exit with error message
+    if args_config_file is not None:
+        if not os.path.isfile(args_config_file):
+            print(f"Config file specified with '--config {args_config_file}' not found.")
+            sys.exit(1)
+
+    if args_config_file and os.path.isfile(args_config_file):  # (1) Command line argument
+        return args_config_file
+    elif os.path.isfile(os.path.join(user_config_file)):  # (2) User config file
+        return user_config_file
+    else:  # (3) System config file (default if nothing else is found)
+        return system_config_file
+
+
 def get_config(config_file=""):
     if not hasattr(get_config, "config"):
         get_config.config = configparser.ConfigParser()