Filter Taskwarrior tasks completed before a certain time. Reads from STDIN, outputs to STDOUT. Backups recommended ;)

datefilter.py

#!/usr/bin/env python
import re
import sys
import time

if len(sys.argv) < 2:
    print "Example usage:"
    print sys.argv[0], "2013-05-05 < ~/.task/completed.data > ~/.task/completed.data.tmp && mv ~/.task/completed.data.tmp ~/.task/completed.data"
    sys.exit(1)

# Date before which entries are to be filtered out.
filter_date = time.mktime(time.strptime(sys.argv[1], "%Y-%m-%d"))

for line in sys.stdin:
    m = re.match('.*(?:\[| )end:"([^"]+)"', line)
    if m and int(m.group(1)) > filter_date:
        sys.stdout.write(line)