better dev command

bin/dev

@@ -27,6 +27,9 @@ class DevHelper:
     # Core logic
     def call(self, *args, **kwargs):
         if not args:
+            print("Usage: dev <command> [args...]\n\nCommands:")
+            for command in self._commands():
+                print(f"  {command}")
             return
 
         command, rest = args[0], args[1:]
@@ -136,14 +139,16 @@ class DevHelper:
             raise NotImplementedError(f"Not implemented for platform {sys.platform}")
 
     def bash_completions(self, *args, **kwargs):
-        completions = sorted(
+        print(" ".join(self._commands()))
+
+    # Private helpers
+    def _commands(self):
+        return sorted(
             METHOD_TO_COMMAND.get(name, name)
             for name in vars(DevHelper)
             if not name.startswith("_") and name != "call" and callable(getattr(DevHelper, name))
         )
-        print(" ".join(completions))
 
-    # Private helpers
     def _parse_issue_url(self, url):
         match = re.match(r"^(https?://[^/]+)/([^/]+)/([^/]+)/issues/(\d+)", url)
         if match is None: