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@hartwork
Created November 22, 2023 16:41
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Finds Git branches that were tracking a remote branch that no longer exists today
# Finds Git branches that were tracking a remote branch that no longer exists today.
# For Python >=3.8, all else is end-of-life.
#
# Copyright (c) 2023 Sebastian Pipping <sebastian@pipping.org>
# Licensed under GPL v3 or later
import re
from subprocess import check_output
# NOTE: See "man git-check-ref-format" for colon (":") being disallowed in references
git_branch_output = check_output(['git', 'branch', '-a', '--format=%(refname):%(upstream)'], text=True)
upstream_of_refname = dict(
# %(refname) format (Git 2.43.0): refs/heads/<branch_name>
# %(upstream) format (Git 2.43.0): refs/remotes/<remote>/<branch_name>
entry.split(':')
for entry
in git_branch_output.split('\n')
if entry
)
for refname, upstream in upstream_of_refname.items():
expected_prefix = 'refs/heads/'
if not refname.startswith(expected_prefix):
continue
if upstream not in upstream_of_refname:
branch_name = refname[len(expected_prefix):]
print(branch_name)
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