on-modify.timewarrior

#!/usr/bin/env python
################################################################################
#
# Copyright 2015 - 2016, Paul Beckingham, Federico Hernandez, liloman
#
# 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.
#
# http://www.opensource.org/licenses/mit-license.php
#
################################################################################

import sys
import json
import os

# Hook should extract all of the following for use as Timewarrior tags:
#   Description and tags together 
#   Project prefixed with pro:

# Make no changes to the task, simply observe.
old = json.loads(sys.stdin.readline())
new = json.loads(sys.stdin.readline())
#don't modify any output
print(json.dumps(new))

#Extract attributes for use as tags.
desc = u''.join(new['description']).encode('utf-8').strip()
tags = ""
project = ""

if 'tags' in new:
  #if it has the notimew tag don't track it then ;)
  for tag in new['tags']:
    if tag == "notimew":
      exit(0)
    else:
      tags+=" +"+u''.join(tag).encode('utf-8').strip()

if 'project' in new:
    project = "pro:"+u''.join(new['project']).encode('utf-8').strip() 

# Started task.
if 'start' in new and not 'start' in old:
    os.system('timew start "'+ desc +'" "'+ project +'" '+ tags +' :yes ')

# Stopped task.
elif not 'start' in new and 'start' in old:
    os.system('timew stop ')