#!/usr/bin/env bash
#
# Find local branches that have been merged
set -euo pipefail
IFS=$'\n\t'
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

: ${MAIN_BRANCH:="main"}

git checkout -q ${MAIN_BRANCH} && git for-each-ref refs/heads/ "--format=%(refname:short)" | while read branch; do mergeBase=$(git merge-base ${MAIN_BRANCH} $branch) && [[ $(git cherry ${MAIN_BRANCH} $(git commit-tree $(git rev-parse "$branch^{tree}") -p $mergeBase -m _)) == "-"* ]] && echo "$branch"; done
