git2changelog.py

   1 #!/usr/bin/env python
   2
   3 # Copyright (C) 2013 nu774
   4 # For conditions of distribution and use, see copyright notice in COPYING
   5
   6 import sys
   7 import re
   8 from subprocess import Popen, PIPE
   9 from itertools import groupby
  10 from collections import namedtuple
  11
  12 GITLOG_FMT = 'commit %H%nauthor %cn <%ae>%ndate %ad%nsubject %s%nref %d%n%n'
  13 GITLOG_CMD = ['git','log','--date=short','--format={0}'.format(GITLOG_FMT)]
  14
  15 Commit = namedtuple('Commit', 'commit author date subject ref')
  16
  17 def parse_gitlog(stream):
  18     re_decode_tag = re.compile(r'(?<=\()([^,)]+)')
  19     commit = dict()
  20     for line in stream:
  21         fields = line.decode('utf-8').rstrip('\r\n').split(' ', 1)
  22         if len(fields) == 2:
  23             key, value = fields
  24             if key == 'ref':
  25                 m = re_decode_tag.search(value)
  26                 value = ' [{0}]'.format(m.group()) if m else ''
  27             commit[key] = value
  28         elif commit:
  29             yield Commit(**commit)
  30             commit = dict()
  31
  32 output=sys.stdout.write
  33
  34 with Popen(GITLOG_CMD, shell=False, stdout=PIPE).stdout as pipe:
  35     commits = parse_gitlog(pipe)
  36     commits_by_date_author = groupby(commits, key=lambda x: (x.date, x.author))
  37     for (date, author), commits in commits_by_date_author:
  38         output('{0}  {1}\n\n'.format(date, author))
  39         for c in commits:
  40             output('  * {0}{1}\n\n'.format(c.subject, c.ref))