.bin/git-rb-all

   1 #!/usr/bin/env python3
   2
   3 """Helper to rebase all local branches."""
   4
   5 import argparse
   6 import functools
   7 import os
   8 from pathlib import Path
   9 import re
  10 import subprocess
  11 import sys
  12
  13
  14 # Not sure if newer features are used.
  15 assert sys.version_info >= (3, 6), f'Python 3.6+ required but found {sys.version}'
  16
  17
  18 PROG = os.path.basename(__file__)
  19
  20
  21 class Terminal:
  22     """Terminal escape sequences."""
  23
  24     CSI_PREFIX = '\033['
  25     SGR_SUFFIX = 'm'
  26     NORMAL = ''
  27     BOLD = '1'
  28     _BLACK, _RED, _GREEN, _YELLOW, _BLUE, _MAGENTA, _CYAN, _WHITE = range(0, 8)
  29     _FG = 30
  30     _BG = 40
  31     FG_BLACK = str(_FG + _BLACK)
  32     FG_RED = str(_FG + _RED)
  33     FG_GREEN = str(_FG + _GREEN)
  34     FG_YELLOW = str(_FG + _YELLOW)
  35     FG_BLUE = str(_FG + _BLUE)
  36     FG_MAGENTA = str(_FG + _MAGENTA)
  37     FG_CYAN = str(_FG + _CYAN)
  38     FG_WHITE = str(_FG + _WHITE)
  39
  40
  41 class Color:
  42     """Helper colors."""
  43
  44     _combine = lambda *args: Terminal.CSI_PREFIX + ';'.join(args) + Terminal.SGR_SUFFIX
  45     NORMAL = _combine(Terminal.NORMAL)
  46     GOOD = _combine(Terminal.FG_GREEN)
  47     WARN = _combine(Terminal.FG_YELLOW)
  48     BAD = _combine(Terminal.FG_RED)
  49     HILITE = _combine(Terminal.BOLD, Terminal.FG_CYAN)
  50     BRACKET = _combine(Terminal.BOLD, Terminal.FG_BLUE)
  51
  52
  53 def fatal(msg):
  54     """Show an error |msg| then exit."""
  55     print(f'{Color.BAD}{PROG}: error: {msg}{Color.NORMAL}', file=sys.stderr)
  56     sys.exit(1)
  57
  58
  59 def git(args, **kwargs):
  60     """Run git."""
  61     kwargs.setdefault('check', True)
  62     kwargs.setdefault('stdout', subprocess.PIPE)
  63     kwargs.setdefault('stderr', subprocess.STDOUT)
  64     kwargs.setdefault('encoding', 'utf-8')
  65     #print('+', 'git', *args)
  66     return subprocess.run(['git'] + args, **kwargs)
  67
  68
  69 @functools.lru_cache(maxsize=None)
  70 def checkout_is_dirty():
  71     """Determine whether the checkout is dirty (e.g. modified files)."""
  72     output = git(['status', '--porcelain']).stdout
  73     return any(x for x in output.splitlines() if '?' not in x[0:2])
  74
  75
  76 @functools.lru_cache(maxsize=None)
  77 def rebase_inprogress():
  78     """Determine whether a rebase is already in progress."""
  79     output = git(['rev-parse', '--git-path', 'rebase-merge']).stdout.strip()
  80     if Path(output).exists():
  81         return True
  82
  83     output = git(['rev-parse', '--git-path', 'rebase-apply']).stdout.strip()
  84     if Path(output).exists():
  85         return True
  86
  87     return False
  88
  89
  90 class AppendOption(argparse.Action):
  91     """Append the command line option (with no arguments) to dest.
  92
  93     parser.add_argument('-b', '--barg', dest='out', action='append_option')
  94     options = parser.parse_args(['-b', '--barg'])
  95     options.out == ['-b', '--barg']
  96     """
  97
  98     def __init__(self, option_strings, dest, **kwargs):
  99         if 'nargs' in kwargs:
 100             raise ValueError('nargs is not supported for append_option action')
 101         super().__init__(option_strings, dest, nargs=0, **kwargs)
 102
 103     def __call__(self, parser, namespace, values, option_string=None):
 104         if getattr(namespace, self.dest, None) is None:
 105             setattr(namespace, self.dest, [])
 106         getattr(namespace, self.dest).append(option_string)
 107
 108
 109 def get_parser():
 110     """Get CLI parser."""
 111     parser = argparse.ArgumentParser(description=__doc__)
 112     parser.add_argument(
 113         '--catchup', action='store_true',
 114         help='run git-rb-catchup when rebasing')
 115     parser.add_argument(
 116         '-q', '--quiet', dest='git_options', action=AppendOption, default=['-q'],
 117         help='passthru to git rebase')
 118     return parser
 119
 120
 121 def main(argv):
 122     """The main entry point for scripts."""
 123     parser = get_parser()
 124     opts = parser.parse_args(argv)
 125
 126     # Skip if rebase is in progress.
 127     if rebase_inprogress():
 128         fatal('skipping due to active rebase')
 129
 130     # Switch to the top dir in case the working dir doesn't exist in every branch.
 131     topdir = git(['rev-parse', '--show-toplevel']).stdout.strip()
 132     os.chdir(topdir)
 133
 134     # Example output:
 135     #  ||m|refs/remotes/origin/master|ahead 2, behind 203
 136     # *||master|refs/remotes/origin/master|ahead 1
 137     #  |/usr/local/src/gnu/gdb/build/release|release||behind 10
 138     #  ||s-stash||
 139     state = git(
 140         ['for-each-ref', '--format=%(HEAD)|%(worktreepath)|%(refname:short)|%(upstream)|%(upstream:track,nobracket)',
 141          'refs/heads/*']).stdout.splitlines()
 142
 143     curr_state = None
 144     branch_width = 0
 145     local_count = 0
 146     for line in state:
 147         head, worktreepath, branch, tracking, ahead_behind = line.split('|')
 148         branch_width = max(branch_width, len(branch))
 149         if head == '*':
 150             curr_state = branch
 151         if not (worktreepath and worktreepath != topdir):
 152             local_count += 1
 153     # If there are no branches to rebase, go silently.
 154     if not local_count:
 155         return 0
 156     if not curr_state:
 157         fatal('unable to resolve current branch')
 158
 159     switched_head = False
 160     branches = {}
 161     for line in state:
 162         _, worktreepath, branch, tracking, ahead_behind = line.split('|')
 163
 164         # If it's a branch in another worktree, ignore it.
 165         if worktreepath and worktreepath != topdir:
 166             continue
 167
 168         print(f'{Color.BRACKET}### {Color.GOOD}{branch:{branch_width}}{Color.NORMAL} ',
 169               end='', flush=True)
 170         if not tracking:
 171             print(f'{Color.WARN}skipping{Color.NORMAL} due to missing merge branch')
 172             continue
 173
 174         m = re.match(r'ahead ([0-9]+)', ahead_behind)
 175         ahead = int(m.group(1)) if m else 0
 176         m = re.search(r'behind ([0-9]+)', ahead_behind)
 177         behind = int(m.group(1)) if m else 0
 178         if not behind:
 179             print('Up-to-date!')
 180             continue
 181         elif not ahead:
 182             # If we haven't switched the checkout, update-ref on current HEAD
 183             # will get us into a dirty checkout, so use merge to handle it.
 184             if switched_head or curr_state != branch:
 185                 git(['update-ref', f'refs/heads/{branch}', tracking])
 186                 print('fast forwarded [updated ref]')
 187             else:
 188                 result = git(['merge', '-q', '--ff-only'], check=False)
 189                 if result.returncode:
 190                     print(f'{Color.BAD}unable to merge{Color.NORMAL}\n' + result.stdout.strip())
 191                 else:
 192                     print('fast forwarded [merged]')
 193             continue
 194
 195         if checkout_is_dirty():
 196             print(f'{Color.BAD}unable to rebase: tree is dirty{Color.NORMAL}')
 197             continue
 198
 199         print(f'rebasing [{ahead_behind}] ', end='', flush=True)
 200         git(['checkout', '-q', branch])
 201         switched_head = True
 202         if opts.catchup:
 203             print()
 204             result = git(['rb-catchup'], capture_output=False, check=False)
 205         else:
 206             result = git(['rebase'] + opts.git_options, check=False)
 207             if result.returncode:
 208                 git(['rebase', '--abort'])
 209                 print(f'{Color.BAD}failed{Color.NORMAL}\n' + result.stdout.strip())
 210             else:
 211                 print('OK!')
 212
 213     if switched_head:
 214         git(['checkout', '-q', curr_state])
 215     return 0
 216
 217
 218 if __name__ == '__main__':
 219     sys.exit(main(sys.argv[1:]))