git-delete-merged-on-remote

#!/usr/bin/env bash

set -e

#
# This script takes the name of a remote, and of a local branch or ref
# (defaulting to "master"). It then iterates over all branches available on
# the remote, and checks whether that remote branch has been merged or rebased
# into the given local branch.
#

while test $# -ne 0
do
    case "$1" in
    -n|--dry-run)
        # -n, --dry-run
        #    Don't actually remove anything, just show what would be done.
        dry_run=1
        ;;
    --)
        shift
        break;;
    *)
        break;;
    esac
    shift
done

if test $# -eq 1 ; then
    remote=$1
    base_branch=$(git get-mainbranch $remote)
elif test $# -eq 2 ; then
    remote=$1
    base_branch=$2
else
    echo "Error, usage: $(basename $0) [-n | --dry-run] <REMOTE> [<LOCAL-BRANCH>]"
    exit 1
fi

# ensure the given remote name is valid
remote_url=$(git remote get-url $remote)

# ensure the given base branch is a valid ref
base_rev=$(git rev-list -n1 $base_branch)

# make sure we have an up-to-date list of branches on that remote
#echo "Fetching remote $remote"
git fetch --prune --quiet $remote

# iterate over the remote branches
#echo "Iterating over branches of remote $remote..."
to_delete=""
for branch in $(git for-each-ref --format='%(refname:short)' refs/remotes/$remote); do
    case $branch  in
      "$remote" ) continue ;;
    esac
    remote_branch=${branch#$remote/}  # remove prefix
    case $remote_branch in
      $base_branch | HEAD | stable* | bisect* | master | trunk | gh-pages ) continue ;;
    esac
    echo -n "." # progress bar

    diff=$(git rev-list -n1 --cherry-pick --right-only --no-merges "$base_branch"..."$branch")
    if [ -z "$diff" ]; then
        #echo $branch
        to_delete="$to_delete $remote_branch"
        # TODO: actually delete? or perhaps leave that to the user...
        # git push --delete $remote $remote_branch
    fi
done
printf "\r\033[0K" # clear progress bar

if [[ -z $to_delete ]] ; then
    echo "No merged or rebased remote branches found"
else
#    echo "To delete merged branches on remote $remote, enter this command:"
    echo "git push --delete $remote$to_delete"
    if test -z "$dry_run" ; then
        git push ${dry_run} --delete $remote$to_delete
    fi
fi