parser: print help when no args

Also create utility script for testing

run.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env sh
+
+# Utility script for rebuilding and running caelestia
+
+cd $(dirname $0) || exit
+
+sudo rm -r dist /usr/bin/caelestia /usr/lib/python3.*/site-packages/caelestia* 2> /dev/null
+python -m build --wheel --no-isolation > /dev/null
+sudo python -m installer --destdir=/ dist/*.whl > /dev/null
+
+/usr/bin/caelestia "$@"

src/caelestia/__init__.py

@@ -2,12 +2,12 @@ from caelestia.parser import parse_args
 
 
 def main() -> None:
-    args = parse_args()
+    parser, args = parse_args()
     if "cls" in args:
         args.cls(args).run()
     else:
-        import sys
-        print("No arguments given", file=sys.stderr)
+        parser.print_help()
+
 
 if __name__ == "__main__":
     main()

src/caelestia/parser.py

@@ -16,7 +16,7 @@ from caelestia.subcommands import (
 )
 
 
-def parse_args() -> argparse.Namespace:
+def parse_args() -> (argparse.ArgumentParser, argparse.Namespace):
     parser = argparse.ArgumentParser(prog="caelestia", description="Main control script for the Caelestia dotfiles")
 
     # Add subcommand parsers
@@ -122,4 +122,4 @@ def parse_args() -> argparse.Namespace:
     pip_parser.set_defaults(cls=pip.Command)
     pip_parser.add_argument("-d", "--daemon", action="store_true", help="start the daemon")
 
-    return parser.parse_args()
+    return parser, parser.parse_args()