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_ref = re.compile(r'(?<=\()([^,)]+)')
  19     re_strip_tag = re.compile(r'^tag: ')
  20     commit = dict()
  21     for line in stream:
  22         fields = line.decode('utf-8').rstrip('\r\n').split(' ', 1)
  23         if len(fields) == 2:
  24             key, value = fields
  25             if key == 'ref':
  26                 m = re_decode_ref.search(value)
  27                 if m:
  28                     value = ' [{0}]'.format(re_strip_tag.sub('', m.group()))
  29                 else:
  30                     value = ''
  31             commit[key] = value
  32         elif commit:
  33             yield Commit(**commit)
  34             commit = dict()
  35
  36 output=sys.stdout.write
  37
  38 with Popen(GITLOG_CMD, shell=False, stdout=PIPE).stdout as pipe:
  39     commits = parse_gitlog(pipe)
  40     commits_by_date_author = groupby(commits, key=lambda x: (x.date, x.author))
  41     for (date, author), commits in commits_by_date_author:
  42         output(u'{0}  {1}\n\n'.format(date, author).encode('utf-8'))
  43         for c in commits:
  44             output(u'  * {0}{1}\n\n'.format(c.subject, c.ref).encode('utf-8'))