Template for integrating argparse.ArgumentParsers from plugins

parser_from_plugin.py

# -*- coding: utf-8 -*-
"""
Created on Wed Mar 16 14:04:54 2016

@author: jenglish
"""

import argparse

parser = argparse.ArgumentParser('t', description="Todo Manager")
commands = parser.add_subparsers(title='commands',
                                 dest="command",
                                 help="supported commands",
                                 )
parser.add_argument('-i', '--interactive', '-l', '--loop', dest="interact",
                    action='store_true', default=False)

list_parser = commands.add_parser('list', help='list tasks',
                                  description="Tool for listing tasks",
                                  )
list_parser.add_argument('-n', action="store_false",
                         dest="by_pri", default=True,
                         help="Prints task list in numerical order, otherwise orders by priority")
list_parser.add_argument('-f', dest="filters", nargs="*",
                         help="Only lists tasks containing these words")
list_parser.add_argument('-y', dest="filterop", action="store_true",
                         default=False,
                         help="Shows tasks matching any filter word. Default is to match all")
list_parser.add_argument('-a', dest="showcomplete", action="store_true", default=False,
                         help="Show completed (but not archived) tasks.")
list_parser.add_argument('-x', dest="showext", action="store_true", default=False,
                         help="Shows hidden text extensions")


add_parser =commands.add_parser('add', help="add a task")
add_parser.add_argument(nargs="+", dest="text",
                        help="text of the new task")

do_parser = commands.add_parser('do', help="mark a task as complete")
do_parser.add_argument('tasknum', type=int,
                       help="number of the task to complete")
do_parser.add_argument('comment', nargs=argparse.REMAINDER,
                       help="comment to add to the completed task")


# assume report_parser is defined elsewhere and imported
report_parser = argparse.ArgumentParser('report')
report_parser.add_argument('text', nargs=argparse.REMAINDER)

# commands has a dictionary it uses to store the subcommands

name = report_parser.prog # assume no prefix commands have been put in

# update report_parser.prog
report_parser.prog = "%s %s" % (parser.prog, name)

commands.choices[name] = report_parser

# to include this in help we need a separate report_help string
choice_action = commands._ChoicesPseudoAction(name, (), "report on tasks")
commands._choices_actions.append(choice_action)



def t(stuff):
    args = parser.parse_args(stuff.split())
    return args

if __name__=='__main__':
    import sys
    args = parser.parse_args(sys.argv[1:])
    print(args)