Remove git merged branches with prompt for every remote branch

my.bashrc

function rmb {
  current_branch=$(git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/')
  if [ "$current_branch" != "master" ]; then
    echo "WARNING: You are on branch $current_branch, NOT master."
  fi
  echo "Pruning branches no longer on origin..."
  git remote prune origin
  echo "Fetching merged branches..."
  remote_branches=$(git branch -r --merged | grep -v '/master$' | grep -v "/$current_branch$")
  local_branches=$(git branch --merged | grep -v 'master$' | grep -v "$current_branch$")
  if [ -z "$remote_branches" ] && [ -z "$local_branches" ]; then
    echo "No existing branches have been merged into $current_branch."
  else
    if [ -n "$local_branches" ]; then
      echo "This will remove the following local branches:"
      echo "$local_branches"
      read -p "Continue? (y/n): " -n 1 choice
      echo
      if [ "$choice" == "y" ] || [ "$choice" == "Y" ]; then
        # Remove local branches
        git branch -d `git branch --merged | grep -v 'master$' | grep -v "$current_branch$" | sed 's/origin\///g' | tr -d '\n'`
      else
        echo "No local branches removed."
      fi
    fi
    if [ -n "$remote_branches" ]; then
      echo "Removing remote branches..."
      prefix="origin/"
      while read -r branch; do
        b=${branch#$prefix}
        read -p "Delete $branch? (y/n): " -n 1 choice </dev/tty
        echo
        if [ "$choice" == "y" ] || [ "$choice" == "Y" ]; then
          git push origin --delete "$b"
        fi
      done <<< "$remote_branches"
    fi
  fi
}

Based on script from http://rob.by/2013/remove-merged-branches-from-git/