Add Cmd.py

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

tools/python/jwutils/Cmd.py

@@ -0,0 +1,48 @@
+from abc import ABCMeta, abstractmethod
+import argparse
+import os
+import sys
+import inspect
+import re
+
+import Object
+
+class Cmd(Object.Object): # export
+
+    __metaclass__=ABCMeta
+
+    @abstractmethod
+    def run(self, args):
+        pass
+
+    def __init__(self, name, help):
+	self.name = name
+        self.help = help
+
+    def _run(self, args):
+        pass
+
+    def add_parser(self, parsers):
+	r = parsers.add_parser(self.name, help=self.help,
+            formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+	r.set_defaults(func=self.run)
+        return r
+
+def run_sub_commands(description = '', prefix = 'Cmd'): # export
+
+    classes = inspect.getmembers(sys.modules["__main__"], inspect.isclass)
+    parser = argparse.ArgumentParser(usage=os.path.basename(sys.argv[0]) + ' [command] [options]',
+	formatter_class=argparse.ArgumentDefaultsHelpFormatter, description=description)
+    parser.add_argument('--log-level', help='Log level', default='notice')
+    subparsers = parser.add_subparsers(title='Available commands', metavar='')
+
+    for (name, cls) in classes:
+	if not re.match('^Cmd.', name):
+	    continue
+	if inspect.isabstract(cls):
+	    continue
+	cls().add_parser(subparsers)
+
+    args=parser.parse_args()
+    jwutils.log.set_level(args.log_level)
+    args.func(args)