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cli.py
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cli.py
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#!/usr/bin/env python3
# Copyright (c) 2021 InSeven Limited
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import argparse
import functools
import logging
COMMANDS = {}
class Command(object):
def __init__(self, name, help, arguments, epilog, formatter_class, callback):
self.name = name
self.help = help
self.arguments = arguments
self.epilog = epilog
self.formatter_class = formatter_class
self.callback = callback
class Argument(object):
def __init__(self, *args, **kwargs):
self.args = args
self.kwargs = kwargs
def command(name, help="", arguments=[], epilog=None, formatter_class=argparse.HelpFormatter):
def wrapper(fn):
@functools.wraps(fn)
def inner(*args, **kwargs):
return fn(*args, **kwargs)
COMMANDS[name] = Command(name, help, arguments, epilog, formatter_class, inner)
return inner
return wrapper
class CommandParser(object):
def __init__(self, *args, **kwargs):
self.parser = argparse.ArgumentParser(*args, **kwargs)
subparsers = self.parser.add_subparsers(help="command")
for name, command in COMMANDS.items():
subparser = subparsers.add_parser(command.name,
help=command.help,
epilog=command.epilog,
formatter_class=command.formatter_class)
for argument in command.arguments:
subparser.add_argument(*(argument.args), **(argument.kwargs))
subparser.set_defaults(fn=command.callback)
def add_argument(self, *args, **kwargs):
self.parser.add_argument(*args, **kwargs)
def run(self):
options = self.parser.parse_args()
if 'fn' not in options:
logging.error("No command specified.")
exit(1)
options.fn(options)