git-delete-merged-branches

#!/usr/bin/env python3

import subprocess

if __name__ == "__main__":
    current_branch = subprocess.check_output(["git", "branch", "--show-current"]).rstrip()
    if not current_branch:
        raise Exception("need to be checked out to a named git branch")
    merged_branches_with_upstream = subprocess.check_output(
        ["git", "branch", "--format", "%(refname:short) %(upstream:short)", "--merged"]
    ).split(b"\n")
    for bu in merged_branches_with_upstream:
        if not bu:
            continue
        (branch, upstream) = bu.split(b" ")
        if branch == current_branch:
            continue
        print(f"deleting branch {branch}...")
        subprocess.check_call(["git", "branch", "-d", branch])