#!/bin/bash
# Find local branches that have been squash-merged into a target branch.
# Usage: git-find-merged [target-branch]
# Default target branch: main

target="${1:-main}"

git for-each-ref refs/heads/ --format='%(refname:short)' | while read branch; do
  [[ "$branch" == "$target" ]] && continue
  merge_base=$(git merge-base "$target" "$branch" 2>/dev/null) || continue
  tree=$(git rev-parse "$branch^{tree}" 2>/dev/null) || continue
  squash_commit=$(git commit-tree "$tree" -p "$merge_base" -m "test" 2>/dev/null) || continue
  cherry_result=$(git cherry "$target" "$squash_commit" 2>/dev/null)
  if [[ "$cherry_result" == "-"* ]]; then
    echo "$branch"
  fi
done