unixorn/git-extra-commands

#!/usr/bin/env python3

# git-changelog
#
# version 2.0, by John Wiegley
#
# The purpose of this code is to turn "git log" output into a complete
# ChangeLog, for projects who wish to begin using a ChangeLog, but haven't
# been.
#
# This version of git-changelog depends on GitPython:
#   git://gitorious.org/git-python/mainline.git

import time
import sys
import re
import os

from git import *  # GitPython
from subprocess import *

repo = Repo(os.getcwd())
ref = "origin/main.."
path = ""

# Usage: git changelog [COMMITISH] [-- [PATH]]

saw_dashdash = False
if len(sys.argv) > 1:
    for arg in sys.argv[1:]:
        if arg == "--":
            saw_dashdash = True
        elif saw_dashdash:
            path = arg
        else:
            ref = arg

for commit in repo.iter_commits(ref, paths=path):
    author = commit.author
    date = commit.committed_date
    log_text = commit.message.split("\n")[0]

    log_text_remainder = commit.message.split("\n\n")[1:]
    while len(log_text_remainder) > 0 and not log_text_remainder[0]:
        log_text_remainder = log_text_remainder[1:]
    log_text_remainder = "\n\t".join(log_text_remainder)
    if log_text_remainder:
        log_text_remainder = "\n\t" + log_text_remainder

    diff = commit.diff(commit.parents[0])
    files = []
    for f in diff:
        if not f.a_blob:
            p = f.b_blob.path
        elif not f.b_blob:
            p = f.a_blob.path
        else:
            continue

        p2 = re.sub("^" + path + "/", "", p)
        if p != p2:
            files.append(p2)

    fp = Popen(["fmt", "-72"], shell=True, stdin=PIPE, stdout=PIPE)
    if files:
        fp.stdin.write(bytes("  * %s: %s" % (",\n\t".join(files), log_text), "utf-8"))
    else:
        fp.stdin.write(bytes(f" * {log_text}", "utf-8"))
    fp.stdin.close()
    log_text = fp.stdout.read()
    del fp

    print(
        f"{time.strftime('%Y-%m-%d', time.gmtime(date))}  {author.name}  <{author.email}>\n"
    )

    if path:
        log_text = re.sub(" " + path + "/", " ", log_text)
        log_text_remainder = re.sub(" " + path + "/", " ", log_text_remainder)

    # If the log_text_remainder already begins with a *, then use that as the
    # changelog text.
    if re.match("\s+\* ", log_text_remainder):
        if log_text_remainder[0] == "\n":
            print(log_text_remainder[1:])
        else:
            print(log_text_remainder)
    else:
        print("%s%s" % (log_text.decode("utf-8"), log_text_remainder))

# git-changelog ends here