cli: move entrypoint and add propre debug flag

italianswirls/__main__.py

@@ -1,8 +0,0 @@
-from italianswirls.server import LS
-
-if __name__ == "__main__":
-    import logging
-    root_logger = logging.getLogger()
-    root_logger.setLevel(logging.DEBUG)
-    root_logger.addHandler(logging.FileHandler("/tmp/a.log"))
-    LS.start_io()

italianswirls/cli.py

@@ -0,0 +1,27 @@
+"""CLI to start the language server"""
+
+import argparse
+import logging
+
+from italianswirls.server import LS
+
+DESCRIPTION = "Italian Swirls, a minimal Python language server based on Jedi."
+DEFAULT_LOG_FILE = "/tmp/italianswirls.log"
+
+
+def main():
+    argparser = argparse.ArgumentParser(description=DESCRIPTION)
+    argparser.add_argument("-d", "--debug", nargs="?", const=DEFAULT_LOG_FILE,
+                           help=f"debug log (default: {DEFAULT_LOG_FILE})")
+    args = argparser.parse_args()
+
+    if debug_log_file := args.debug:
+        root_logger = logging.getLogger()
+        root_logger.setLevel(logging.DEBUG)
+        root_logger.addHandler(logging.FileHandler(debug_log_file))
+
+    LS.start_io()
+
+
+if __name__ == "__main__":
+    main()