clean git branches

git-clean-branches

#!/usr/bin/env bash
set -eu

# http://docopt.org/
usage() {
    cat << EOT
Clean local branches except for master.

Usage: git-clean-branches [options...]

Options:
  -d, --dry-run                 only print what would be cleaned
  -m, --merged                  only clean those branches that were merged into HEAD
  -i <branch>, --into <branch>  only clean those branches that were merged into <branch>
  -h, --help                    show this help and exit

EOT
    exit "$1"
}

args=()
dry_run=false

while (( $# > 0 )); do
    case "$1" in
        -d|--dry-run)
            dry_run=true
            shift 1
            ;;
        -h|--help)
            usage 0
            ;;
        -m|--merged)
            args+=(--merged HEAD)
            shift 1
            ;;
        -i|--into)
            args+=(--merged)
            if (( $# > 0 )); then
                args+=("$2")
            else
                usage 1 >&2
            fi
            shift 2
            ;;
        *)
            shift 1
            ;;
    esac
done

current_branch=$(git rev-parse --abbrev-ref HEAD)
readonly args current_branch dry_run

branches=()
for branch in $(git for-each-ref --format '%(refname:short)' "${args[@]}" refs/heads/); do
    if [[ "${branch}" != master && "${branch}" != "${current_branch}" ]]; then
        branches+=("${branch}")
    fi
done

if (( ${#branches[@]} )); then
    if [[ "${dry_run}" == true ]]; then
        printf '%s\n' "${branches[@]}"
    else
        git branch -D "${branches[@]}"
    fi
fi