Taskwarrior on-add antiduplicate hook

on-add-antiduplicate

#!/usr/bin/python

# Install tasklib from my hooks branch
# sudo pip install --force git+git://github.com/tbabej/tasklib@hooks2 

import sys
from tasklib.task import TaskWarrior, Task

tw = TaskWarrior()  # Use data_location for alternate locations, see docs
task = Task.from_input()

if task['parent']:
    if len(tw.tasks.filter(parent=task['parent'], due=task['due'])):
        print "Duplicate recurrent task blocked: %s" % task['description']
        sys.exit(1)

print task.export_data()