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Prepare release 23.9.0 (#3863)
[etc/vim.git] / scripts / migrate-black.py
1 #!/usr/bin/env python3
2 # check out every commit added by the current branch, blackify them,
3 # and generate diffs to reconstruct the original commits, but then
4 # blackified
5 import logging
6 import os
7 import sys
8 from subprocess import PIPE, Popen, check_output, run
9
10
11 def git(*args: str) -> str:
12     return check_output(["git"] + list(args)).decode("utf8").strip()
13
14
15 def blackify(base_branch: str, black_command: str, logger: logging.Logger) -> int:
16     current_branch = git("branch", "--show-current")
17
18     if not current_branch or base_branch == current_branch:
19         logger.error("You need to check out a feature branch to work on")
20         return 1
21
22     if not os.path.exists(".git"):
23         logger.error("Run me in the root of your repo")
24         return 1
25
26     merge_base = git("merge-base", "HEAD", base_branch)
27     if not merge_base:
28         logger.error(
29             "Could not find a common commit for current head and %s" % base_branch
30         )
31         return 1
32
33     commits = git(
34         "log", "--reverse", "--pretty=format:%H", "%s~1..HEAD" % merge_base
35     ).split()
36     for commit in commits:
37         git("checkout", commit, "-b%s-black" % commit)
38         check_output(black_command, shell=True)
39         git("commit", "-aqm", "blackify")
40
41     git("checkout", base_branch, "-b%s-black" % current_branch)
42
43     for last_commit, commit in zip(commits, commits[1:]):
44         allow_empty = (
45             b"--allow-empty" in run(["git", "apply", "-h"], stdout=PIPE).stdout
46         )
47         quiet = b"--quiet" in run(["git", "apply", "-h"], stdout=PIPE).stdout
48         git_diff = Popen(
49             [
50                 "git",
51                 "diff",
52                 "--binary",
53                 "--find-copies",
54                 "%s-black..%s-black" % (last_commit, commit),
55             ],
56             stdout=PIPE,
57         )
58         git_apply = Popen(
59             [
60                 "git",
61                 "apply",
62             ]
63             + (["--quiet"] if quiet else [])
64             + [
65                 "-3",
66                 "--intent-to-add",
67             ]
68             + (["--allow-empty"] if allow_empty else [])
69             + [
70                 "-",
71             ],
72             stdin=git_diff.stdout,
73         )
74         if git_diff.stdout is not None:
75             git_diff.stdout.close()
76         git_apply.communicate()
77         git("commit", "--allow-empty", "-aqC", commit)
78
79     for commit in commits:
80         git("branch", "-qD", "%s-black" % commit)
81
82     return 0
83
84
85 if __name__ == "__main__":
86     import argparse
87
88     parser = argparse.ArgumentParser()
89     parser.add_argument("base_branch")
90     parser.add_argument("--black_command", default="black -q .")
91     parser.add_argument("--logfile", type=argparse.FileType("w"), default=sys.stdout)
92     args = parser.parse_args()
93     logger = logging.getLogger(__name__)
94     logger.addHandler(logging.StreamHandler(args.logfile))
95     logger.setLevel(logging.INFO)
96     sys.exit(blackify(args.base_branch, args.black_command, logger))