#!/usr/bin/python

"""Modify a dependency listed in a package.json file"""

# Copyright 2013 T.C. Hollingsworth <tchollingsworth@gmail.com>
#
# 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 json
import os
import shutil
import sys

if not os.path.exists('package.json~'):
    shutil.copy2('package.json', 'package.json~')

md = json.load(open('package.json'))

if 'dependencies' not in md: 
    md['dependencies'] = {}

if sys.argv[1] == '-r':
    dep = sys.argv[2]
    del md['dependencies'][dep]
else:
    dep = sys.argv[1]

    if len(sys.argv) > 2:
        ver = sys.argv[2]
    else:
        ver = '*'

    md['dependencies'][dep] = ver

fh = open('package.json', 'w')
data = json.JSONEncoder(indent=4).encode(md)
fh.write(data)
fh.close()