Script that interactively cleans up remote Git branches already merged into master

git_delete_merged.sh

#!/usr/bin/env bash

# This script will show you all of the branches in the current Git repo that are already
# merged into $dest_branch.
#
# Afterward you will be prompted with whether you want to proceed with deleting those remote
# branches (automatically).
#
# Finally you will be prompted with whether you want to prune local branches.
#
# Note if you `ln -s` this (or just save it) as `git-delete-merged` you can run it with 
# `git delete-merged`.

# allow passing the destination branch as an argument
dest_branch=$1

# default to master if no argument
if [ "$dest_branch" == "" ] ; then
    dest_branch="master"
fi

prompt_confirm() {
    while true ; do
        read -r -p "${1:-Continue?} [y/n]: " reply
        case $reply in
            [yY]) return 0 ;;
            [nN]) return 1 ;;
        esac
    done
}

merged_branches=`git branch -r --merged $dest_branch | egrep -v "upstream\/|master|develop|release\/" | sed 's/origin\///' | xargs -0 -n 1 echo`

if [ ! "$merged_branches" == "" ] ; then
    read -p "Press any key to preview the branches that have already been merged into the $dest_branch branch."
    echo "$merged_branches" | more

    prompt_confirm "Do you want to delete above branches?" || exit 0
    echo "$merged_branches" | xargs -n 1 git push origin --delete

    prompt_confirm "Do you want to prune your local branches?" || exit 0
    git remote prune origin
else
    echo "There are no outstanding branches merged into $dest_branch - ensure you have the latest changes to $dest_branch by performing a git fetch & pull."
fi