#!/usr/bin/env python3
# vim: set noet sw=4 ts=4:

import subprocess
import sys
import time

force = len(sys.argv) == 2 and sys.argv[1] == '-f'

output = subprocess.check_output(['git', 'branch', '--merged', 'origin/master', '-a'], universal_newlines=True)
branches = []
for line in output.split('\n'):
	if not line.startswith('  ') or ' -> ' in line:
		continue
	line = line[2:]
	if line.startswith('remotes/origin/'):
		line = line[8:]
	branches.append(line)

day_seconds = 24 * 60 * 60
now = time.time()
cutoff = now - 30 * day_seconds
for branch in branches:
	if branch == 'origin/master':
		continue
	output = subprocess.check_output(['git', 'show', branch, '-s', '--format=%at %ct'], universal_newlines=True)
	if not output.endswith('\n'):
		raise Exception()
	timestamp = max(map(int, output[:-1].split(' ', 2)))
	if timestamp > cutoff:
		print('ignoring', branch)
		continue

	print('deleting %s (%.1f days old)' % (branch, (now - timestamp) / day_seconds))
	if branch.startswith('origin/'):
		subprocess.check_call(['git', 'push', 'origin', ':' + branch[7:]])
	else:
		subprocess.check_call(['git', 'branch', '-d', branch])