#!/usr/bin/env bash
# nerf-gh-pr-diff -- Show the diff for a pull request.
# Generated from gh manifest. Do not edit directly.
# nerf:threat:read=remote
# nerf:threat:write=none

if [[ "${BASH_VERSINFO[0]:-0}" -lt 4 ]]; then
  echo "error: nerf-gh-pr-diff requires bash 4+. Found bash ${BASH_VERSION:-unknown}" >&2
  echo "  hint: on macOS, install a newer bash via 'brew install bash'" >&2
  exit 1
fi

set -euo pipefail

_NERF_DRY_RUN=""

usage() {
  cat >&2 <<'EOF'
Usage: nerf-gh-pr-diff <pr>

Arguments:
  <pr> (required)
      PR number, URL, or branch name

Maps to: gh pr diff <pr>

Show the diff for a pull request.
EOF
  exit 1
}

while [[ $# -gt 0 ]]; do
  case "$1" in
    --nerf-dry-run) _NERF_DRY_RUN="true"; shift 1 ;;
    -h|--help) usage ;;
    --) shift; break ;;
    *) break ;;
  esac
done

_PR_SET=""
if [[ $# -gt 0 ]]; then
  PR="$1"
  _PR_SET=true
  shift
else
  PR=""
fi
if [[ $# -gt 0 ]]; then
  echo "error: nerf-gh-pr-diff: unexpected extra arguments: $*" >&2
  echo "  hint: switches and options must come before positional arguments" >&2
  exit 1
fi

if [[ -n "${_PR_SET}" ]] && [[ "${PR}" == -* ]]; then
  echo "error: nerf-gh-pr-diff: <pr> cannot start with '-'" >&2
  echo "  hint: use -- before positional arguments if needed" >&2
  exit 1
fi

if [[ -z "${PR}" ]]; then
  echo "error: nerf-gh-pr-diff: missing required argument <pr>" >&2
  echo "  hint: provide a value for <pr>" >&2
  usage
fi

if [[ "$_NERF_DRY_RUN" == "true" ]]; then
  _NERF_DRY_CMD=(gh pr diff "${PR}")
  printf 'dry-run:'
  for _a in "${_NERF_DRY_CMD[@]}"; do printf " %q" "$_a"; done
  echo
  exit 0
fi

exec gh pr diff "${PR}"
