#! /usr/bin/env bash
set -e

main() {
  local ref="$1"
  local commits
  local files

  [ -z "$ref" ] && ref="HEAD"
  commits="$(git rev-list "$ref")"

  for commit in $commits; do
    files="$(git diff-tree --no-commit-id --name-only -r "$commit")"
    for file in $files; do
      echo "${commit}: $file"
    done
  done
}

main "$@"