Utility to show squash-merged branches that should be pruned

git-prune-squashed

#!/bin/bash

git for-each-ref refs/heads/ "--format=%(refname:short)" |
  while read branch; do 
    mergeBase=$(git merge-base HEAD "${branch}" )
    tree=$(git rev-parse "${branch}^{tree}")
    tempCommit=$(git commit-tree "${tree}" -p "${mergeBase}" -m "_" )
    if [[ $(git cherry HEAD "${tempCommit}") == "-"* ]]; then
        echo "git branch -D ${branch}"
    fi
done
git prune