unixorn/git-extra-commands

#!/usr/bin/env bash
#
# git-rename-branches - rename multiple branches that start with a given name
#
#    Copyright (C) 2012 Rodrigo Silva (MestreLion) <linux@rodrigosilva.com>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program. If not, see <http://www.gnu.org/licenses/gpl.html>

usage() {
cat <<- USAGE
    Usage: $self [options] BRANCH_PREFIX  NEW_PREFIX
USAGE
if [[ "$1" ]] ; then
    cat <<- USAGE
        Try '$self --help' for more information.
    USAGE
    exit 1
fi
cat <<-USAGE

    Batch renames branches with a matching prefix to another prefix

    Options:
    -h|--help     - show this page.
    -v|--verbose  - print more details about what is being done.
    -n|--dry-run  - do not actually renames the branches.

    BRANCH_PREFIX - a prefix that matches the start of branch names
    NEW_PREFIX    - the new prefix for the branch names

    Examples:
    $ git-rename-branches bug bugfix
    bug/128  -> bugfix/128
    bug_test -> bugfix_test

    $ git-rename-branches ma backup/ma
    master -> backup/master
    main   -> backup/main

    Copyright (C) 2012 Rodrigo Silva (MestreLion) <linux@rodrigosilva.com>
    License: GPLv3 or later. See <http://www.gnu.org/licenses/gpl.html>
USAGE
exit 0
}
invalid() { echo "$self: invalid option $1" ; usage 1 ; }
missing() { echo "$self: missing ${1:+$1 }operand" ; usage 1 ; }

self="${0##*/}"
verbose=0
dry_run=0

# Loop options
while (( $# )); do
    case "$1" in
    -h|--help     ) usage                ;;
    -v|--verbose  ) verbose=1            ;;
    -n|--dry-run  ) dry_run=1            ;;
    --            ) shift        ; break ;;
    -*            ) invalid "$1" ; break ;;
    *             )                break ;;
    esac
    shift
done

[[ "$1" && "$2" ]] || missing

while read -r branch; do
    if (($dry_run)) ; then
        (($verbose)) && echo "$branch -> ${2}${branch#$1}"
    else
        git branch -m "$branch" "${2}${branch#$1}" &&
            (($verbose)) && echo "$branch -> ${2}${branch#$1}"
    fi
done < <(git branch | awk -v branches="${1/\\/\\\\}" '$NF ~ "^" branches {print $NF}')