tj.git-extras/bin/git-delete-squashed-branches

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#!/usr/bin/env bash
set -euo pipefail
if [[ $# -eq 0 ]]; then
targetBranch=$(git rev-parse --abbrev-ref HEAD)
else
targetBranch=$1
git checkout "$targetBranch"
fi
git for-each-ref refs/heads/ "--format=%(refname:short)" | while read -r branch; do
mergeBase=$(git merge-base "$targetBranch" "$branch")
if [[ $(git cherry $targetBranch $(git commit-tree $(git rev-parse $branch\^{tree}) -p $mergeBase -m _)) == "-"* ]]; then
git branch -D "$branch"
fi
done