#!/bin/bash
#
# From https://blog.filippo.io/git-fixup-amending-an-older-commit/

set -e

function usage() {
  name=$(basename "$0")
  echo "Usage: ${name} <commit-ish> [git commit arguments]" >&2
  exit 1
}

[[ -z "$1" ]] && usage

target=$(git rev-parse "$1")
git commit --fixup="$target" "${@:2}"
VISUAL=true EDITOR=true git rebase -i --autostash --autosquash "$target^"