delete-branch

#!/bin/bash

delete-branch() {
  local unwanted_branches current_branch mode
  current_branch="$(git symbolic-ref -q HEAD)"
  current_branch="${current_branch##refs/heads/}"
  current_branch="${current_branch:-HEAD}"

  case "${1}" in
    (--local)  shift 1; mode=local ;;
    (--remote) shift 1; mode=remote ;;
    (--both)   shift 1; mode=both ;;
    (*)        mode=local ;;
  esac

  case "${1}"  in
    ('')
      unwanted_branches=$(
        git branch |
          grep --invert-match '^\*' |
          cut -c 3- |
          fzf --multi --preview="git log {}"
      )
    ;;
    (*)  unwanted_branches="${*}" ;;
  esac

  case "${mode}" in
    (local)
      for branch in ${unwanted_branches}; do
        git branch --delete --force "${branch}"
      done
    ;;
    (remote)
      for branch in ${unwanted_branches}; do
        git push origin --delete "${branch}"
      done
    ;;
    (both)
      for branch in ${unwanted_branches}; do
        git branch --delete --force "${branch}"
        git push origin --delete "${branch}"
      done
    ;;
  esac
}

delete-branch --local leaf
delete-branch --remote leaf
delete-branch --both leaf
delete-branch leaf