Closes #35: Implemented logging

sublime/__main__.py

@@ -1,13 +1,50 @@
 #! /usr/bin/env python3
-import sys
+import argparse
+import logging
 
 import gi
 gi.require_version('Gtk', '3.0')
 from gi.repository import Gtk  # noqa: F401
 
+import sublime
 from .app import SublimeMusicApp
 
 
 def main():
+    parser = argparse.ArgumentParser(description='Sublime Music')
+    parser.add_argument(
+        '-v',
+        '--version',
+        help='show version and exit',
+        action='store_true',
+    )
+    parser.add_argument(
+        '-l',
+        '--logfile',
+        help='the filename to send logs to',
+    )
+    parser.add_argument(
+        '-m',
+        '--loglevel',
+        help='the minium level of logging to do',
+        default='WARNING',
+    )
+
+    args, unknown_args = parser.parse_known_args()
+    if args.version:
+        print(f'Sublime Music v{sublime.__version__}')
+        return
+
+    min_log_level = getattr(logging, args.loglevel.upper(), None)
+    if not isinstance(min_log_level, int):
+        logging.error(f'Invalid log level: {args.loglevel.upper()}.')
+        min_log_level = logging.WARNING
+
+    logging.basicConfig(
+        filename=args.logfile,
+        level=min_log_level,
+        format='%(asctime)s:%(levelname)s:%(name)s:%(module)s:%(message)s',
+    )
+
     app = SublimeMusicApp()
-    app.run(sys.argv)
+    app.run(unknown_args)