delete-squashed-branches

delete-squashed-branches.sh

#!/bin/sh

# Cribbed most of this from
# https://stackoverflow.com/questions/43489303/how-can-i-delete-all-git-branches-which-have-been-squash-and-merge-via-github

# Requirements:
# gh (https://cli.github.com/)

# Installation:
# touch ~/bin/delete-squashed-branches (or somewhere in your path)
# edit that file and paste this script into it
# chmod +x ~/bin/delete-squashed-branches

# Usage:
# delete-squashed-branches (will list any local branches that have been merged and can be deleted)
# delete-squashed-branches -D (to actually delete the branches)


# Determine which branch this repo considers the main branch
main=$(gh repo view --json defaultBranchRef --jq .defaultBranchRef.name)

# Switch to that main branch
git checkout -q $main;

# Loop through all branches and list any that have been squashed and merged
# Delete them if the -D flag is passed
git for-each-ref refs/heads/ "--format=%(refname:short)" | while read branch; do
  mergeBase=$(git merge-base $main $branch);
  revParse=$(git rev-parse "$branch^{tree}");
  commitTree=$(git commit-tree $revParse -p $mergeBase -m _);
  if [[ $(git cherry $main $commitTree) == "-"* ]]; then
    if [[ $1 == '-D' ]]; then
      git branch -D $branch;
    else
      echo "$branch is merged into $main and can be deleted";
    fi
  fi
done