echo "${BASH_SOURCE[0]}"
    nix run nixpkgs#shellcheck -- -S style -x "${BASH_SOURCE[0]}" || return 1
    echo "$(dirname "${BASH_SOURCE[0]}")/bash/libdemo.sh"
    nix run nixpkgs#shellcheck -- -S style -x "$(dirname "${BASH_SOURCE[0]}")/bash/libdemo.sh" || return 1
    local f

        demoheader "$(dirname "${f}" | sed 's|^\./||')"
        shellcheck_dir "$(dirname "${f}")" || return 1

        echo "${f}"
        nix run nixpkgs#shellcheck -- -S style -x "${f}" || return 1

    local f

lint || exit 1
run

usage() {
    echo "$0: run all 'demo.sh' scripts using libdemo"
    echo "  -l|--lint: run linter first"
    echo "  -a|--auto: run in automatic mode"
    echo "  -h|--help|-?: Show usage"
}
do_lint=0
do_interactive=1
while [[ $# -gt 0 ]]; do
  case $1 in
      -l|--lint)
          do_lint=1
          shift
          ;;
      -a|--auto)
          do_interactive=0
          shift
          ;;
      -h|--help|-\?)
          usage
          exit 0
          ;;
      -*)
          echo "Unknown option $1"
          exit 1
          ;;
      *)
          POSITIONAL_ARGS+=("$1") # save positional arg
          shift
          ;;
  esac
done
if [ "${do_lint}" = 1 ]; then
    lint || exit 1
else
    LIBDEMO_INTERACTIVE="${do_interactive}" run
fi

    shellcheck_dir() {
        local path="${1}"
        shift
        pushd "${path}" > /dev/null || return 1
        set +e
        local retval=0
        while IFS= read -r f; do
            if shellcheck -S style -x "${f}"; then
                :
            else
                retval=1
            fi
        done < <(grep --exclude-dir .git "${@}" -l -R -e '^#\!.*sh' -e '^# shellcheck shell' | sort)
        popd > /dev/null || return 1
        return "${retval}"
    }

# https://github.com/koalaman/shellcheck/blob/master/shellcheck.1.md
# Look for 'source'd files relative to the checked script
source-path=SCRIPTDIR
# Suggest adding a default case in `case` statements
enable=add-default-case
# Suggest explicitly using -n in `[ $var ]`
enable=avoid-nullary-conditions
# Turn on warnings for unassigned uppercase variables
# enable=check-unassigned-uppercase
# Turn on warnings for unquoted variables with safe values
enable=quote-safe-variables
# Suggest putting braces around all variable references
enable=require-variable-braces