on-add_annotate.py

#!/usr/bin/env python3
#
# Save as on-add_annotate.py in hooks directory, then:
#  $ chmod +x ~/.task/hooks/on-add_annotate.py
#
# Anything after "annotate:" in a new task's description is added as an
# annotation:
#  $ task add this is the description annotate:this is an annotation

import json
import sys

task = json.loads(sys.stdin.readline())

try:
    desc, anno = task["description"].split(" annotate:")
    task["description"] = desc
    task["annotations"] = [{"entry": task["entry"], "description": anno}]
except ValueError:
    pass

print(json.dumps(task))