A git custom command to clean up unneeded local branches

git-remove-merged

#!/bin/bash

set -euo pipefail

for branch in $(git branch --format="%(refname:lstrip=2)" --merged)
do
  echo "Considering $branch"
  if git config branch.$branch.remote
  then
    # Branch has remote tracking
    ORIGIN_NAME=$(git config branch.$branch.remote)
    ORIGIN_REF=$(git config branch.$branch.merge)
    if git ls-remote --exit-code $ORIGIN_NAME $ORIGIN_REF
    then
      echo "Remote branch still exists, skipping"
    else
      echo "Removing branch"
      git branch -D $branch
    fi
  else
    echo "Tracking not presnt, assuming not yet pushed"
  fi
done