unixorn/git-extra-commands

#!/usr/bin/env bash
#
# ls branch files
#
# Copyright 2022, Joe Block <jpb@unixorn.net>

set -o pipefail
if [[ -n "$DEBUG" ]]; then
  set -x
fi

BASENAME=$(basename "${0}")

function fail() {
  printf '%s\n' "$1" >&2  ## Send message to stderr. Exclude >&2 if you don't want it that way.
  exit "${2-1}"  ## Return a code specified by $2 or 1 by default.
}

function usage() {
  echo "Usage:"
  echo
  echo "  ${BASENAME} <parent branch name>"
  echo
  echo "Lists files touched by the specified branch."
}

if [[ ${#} -ne 1 ]]; then
  fail "Only one argument required, the branch to compare."
fi

if [ "$1" == '-h' ] || [ "$1" == '--help' ] ; then
  usage
  exit 0
fi

branch="${1}"
current_branch=$(git rev-parse --abbrev-ref HEAD)
mergeSHA=$(git merge-base "${current_branch}" "${branch}")

exec git diff --name-status "${mergeSHA}" "${current_branch}"