unixorn/git-extra-commands

#!/usr/bin/env bash
#
# git-prune-branches
#
# Simple script that cleans up unnecessary branches.
#
# First it deletes each fully merged branch after prompting
# for confirmation.
#
# Then it prunes all branches that no longer exist at each upstream
# remote.
#
# Author: Michael Demmer https://github.com/demmer
# License: MIT
# Original source: https://github.com/jut-io/git-scripts/blob/master/bin/git-prune-branches

PRIMARY_BRANCH=$(git remote show origin | awk '/HEAD branch/ {print $3}')
if [[ -z "$PRIMARY_BRANCH" ]]; then
  echo "Could not determine primary branch"
  exit 13
fi

merged=$(git branch --no-color --merged "$PRIMARY_BRANCH" | grep -v "$PRIMARY_BRANCH" | sed 's/\*/ /')

if [ -n "$merged" ] ; then
  echo "Deleting the following merged branches:"
  for branch in $merged ; do
    echo "    " "$branch"
  done

  all=n
  delete=n
  for branch in $merged ; do
  if [ $all = 'n' ] ; then
    delete=n
    # shellcheck disable=SC2162
    read -p "Delete $branch (y=yes, n=no, a=all)? " prompt
    echo "all=$all delete=$delete prompt=$prompt"
    if [ "$prompt" = 'a' ] ; then
      delete=y
      all=y
    elif [ "$prompt" = 'y' ]; then
      delete=y
    fi
  fi

  if [ "$delete" = 'y' ] ; then
    git branch -d "$branch"
  fi
  done
fi

remotes=$(git remote)
for remote in $remotes ; do
  prompt=n
  # shellcheck disable=SC2162
  read -p "Prune deleted branches from remote '$remote' (y=yes n=no)? " prompt
  if [ "$prompt" = 'y' ] ; then
    git remote prune "$remote"
  fi
done