jw-pkg.sh: Print help for missing subcommands

Print a help message if no subcommand is specified for one of the
comamnds "distro" and "projects".

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/cmds/CmdDistro.py

@@ -43,4 +43,6 @@ class CmdDistro(CmdBase): # export
         return self.__interactive
 
     async def _run(self, args):
-        raise Exception("Running with args", args)
+        # Missing subcommand
+        self.parser.print_help()
+        sys.exit(1)

src/python/jw/pkg/cmds/CmdProjects.py

@@ -16,4 +16,6 @@ class CmdProjects(CmdBase): # export
         super().add_arguments(p)
 
     async def _run(self, args):
-        raise Exception("Running with args", args)
+        # Missing subcommand
+        self.parser.print_help()
+        sys.exit(1)

src/python/jw/pkg/lib/App.py

@@ -22,6 +22,7 @@ class App: # export
             parser = parsers.add_parser(cmd.name, help=cmd.help, formatter_class=argparse.ArgumentDefaultsHelpFormatter)
             parser.set_defaults(func=cmd.run)
             cmd.add_arguments(parser)
+            cmd.set_parser(parser)
             return parser
 
         def add_cmds_to_parser(parent, parser, cmds, all=False):

src/python/jw/pkg/lib/Cmd.py

@@ -20,6 +20,7 @@ class Cmd(abc.ABC): # export
         self.__help = help
         self.__children: list[Cmd] = []
         self.__child_classes: list[type[Cmd]] = []
+        self.__parser: ArgumentParser|None = None
 
     @abc.abstractmethod
     async def _run(self, args) -> None:
@@ -50,6 +51,14 @@ class Cmd(abc.ABC): # export
                 parent = parent.__parent
         return self.__app
 
+    # Don't use a setter decorator to force using a grepable method
+    def set_parser(self, parser: ArgumentParser):
+        self.__parser = parser
+
+    @property
+    def parser(self) -> str:
+        return self.__parser
+
     @property
     def name(self) -> str:
         return self.__name