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Diffstat (limited to 'examples/decorator_example.py')
-rwxr-xr-x | examples/decorator_example.py | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/examples/decorator_example.py b/examples/decorator_example.py new file mode 100755 index 00000000..5b8b303b --- /dev/null +++ b/examples/decorator_example.py @@ -0,0 +1,112 @@ +#!/usr/bin/env python +# coding=utf-8 +"""A sample application showing how to use cmd2's argparse decorators to +process command line arguments for your application. + +Thanks to cmd2's built-in transcript testing capability, it also +serves as a test suite when used with the exampleSession.txt transcript. + +Running `python decorator_example.py -t exampleSession.txt` will run +all the commands in the transcript against decorator_example.py, +verifying that the output produced matches the transcript. +""" +import argparse +import sys + +import cmd2 + + +class CmdLineApp(cmd2.Cmd): + """ Example cmd2 application. """ + def __init__(self, ip_addr=None, port=None, transcript_files=None): + self.multiline_commands = ['orate'] + self.shortcuts.update({'&': 'speak'}) + self.maxrepeats = 3 + + # Add stuff to settable and/or shortcuts before calling base class initializer + self.settable['maxrepeats'] = 'Max number of `--repeat`s allowed' + + # Set use_ipython to True to enable the "ipy" command which embeds and interactive IPython shell + super().__init__(use_ipython=False, transcript_files=transcript_files) + + # Disable cmd's usage of command-line arguments as commands to be run at invocation + # self.allow_cli_args = False + + # Example of args set from the command-line (but they aren't being used here) + self._ip = ip_addr + self._port = port + + # Setting this true makes it run a shell command if a cmd2/cmd command doesn't exist + # self.default_to_shell = True + + speak_parser = argparse.ArgumentParser() + speak_parser.add_argument('-p', '--piglatin', action='store_true', help='atinLay') + speak_parser.add_argument('-s', '--shout', action='store_true', help='N00B EMULATION MODE') + speak_parser.add_argument('-r', '--repeat', type=int, help='output [n] times') + speak_parser.add_argument('words', nargs='+', help='words to say') + + @cmd2.with_argparser(speak_parser) + def do_speak(self, args): + """Repeats what you tell me to.""" + words = [] + for word in args.words: + if args.piglatin: + word = '%s%say' % (word[1:], word[0]) + if args.shout: + word = word.upper() + words.append(word) + repetitions = args.repeat or 1 + for i in range(min(repetitions, self.maxrepeats)): + self.poutput(' '.join(words)) + + do_say = do_speak # now "say" is a synonym for "speak" + do_orate = do_speak # another synonym, but this one takes multi-line input + + tag_parser = argparse.ArgumentParser() + tag_parser.add_argument('tag', help='tag') + tag_parser.add_argument('content', nargs='+', help='content to surround with tag') + + @cmd2.with_argparser(tag_parser) + def do_tag(self, args): + """create a html tag""" + self.poutput('<{0}>{1}</{0}>'.format(args.tag, ' '.join(args.content))) + + + @cmd2.with_argument_list + def do_tagg(self, arglist): + """verion of creating an html tag using arglist instead of argparser""" + if len(arglist) >= 2: + tag = arglist[0] + content = arglist[1:] + self.poutput('<{0}>{1}</{0}>'.format(tag, ' '.join(content))) + else: + self.perror("tagg requires at least 2 arguments") + + +if __name__ == '__main__': + # You can do your custom Argparse parsing here to meet your application's needs + parser = argparse.ArgumentParser(description='Process the arguments however you like.') + + # Add a few arguments which aren't really used, but just to get the gist + parser.add_argument('-p', '--port', type=int, help='TCP port') + parser.add_argument('-i', '--ip', type=str, help='IPv4 address') + + # Add an argument which enables transcript testing + args, unknown_args = parser.parse_known_args() + + port = None + if args.port: + port = args.port + + ip_addr = None + if args.ip: + ip_addr = args.ip + + # Perform surgery on sys.argv to remove the arguments which have already been processed by argparse + sys.argv = sys.argv[:1] + unknown_args + + # Instantiate your cmd2 application + c = CmdLineApp() + + # And run your cmd2 application + c.cmdloop() |