edit-git-log

#!/usr/bin/python

import sys
import re
import os
import tempfile
import subprocess

def do_user():
  if len(sys.argv) != 2:
    raise Exception("usage: %s fromcommit..tocommit")
  commit_range = sys.argv[1]
  tmp = tempfile.NamedTemporaryFile(mode="w+")

  subprocess.check_call([
    "git", "log", "-z", commit_range],
    stdout=tmp)
  tmp.flush()
  
  # Allow user to edit log
  subprocess.check_call([
    os.getenv("EDITOR", "vim"),
    tmp.name])

  # Run filter branch
  subprocess.check_call([
    "git", "filter-branch",
    "-f",
    "--msg-filter",
    "ACT_AS=filter %s %s" % (sys.argv[0], tmp.name),
    commit_range])
  tmp.close()

def apply_changes():
  """Called by filter-branch to apply the changes"""
  method = sys.argv[1]
  
  f = file(sys.argv[1])
  data = f.read()
  f.close()
  
  lookfor = os.getenv("GIT_COMMIT")
  
  entries = data.split("\0")
  by_hash = dict()
  for e in entries:
    if lookfor not in e:
      next
    meta,log = e.split("\n\n", 1)
    meta_lines = meta.split("\n")
    commit = meta_lines[0].split(" ")[1]
    if commit == lookfor:
      print re.sub(r'(?m)^ {0,4}', '', log)


act_as = os.getenv("ACT_AS", "user")

if act_as == "filter":
  apply_changes()
elif act_as == "user":
  do_user()
else:
  raise Exception("Unknown call type: " + act_as)