#!/bin/sh
##
## SPDX-FileCopyrightText: 2023 Benjamin Grande M. S. <ben.grande.b@gmail.com>
##
## SPDX-License-Identifier: CC-BY-SA-3.0
##
## Credits: https://stackoverflow.com/a/44644933
## From any file, get its current directory.
## usage: get-script-dir $0
set -eu
test -n "${1-}" || exit 1

prg="$1"
if ! test -e "$prg"; then
  case "$prg" in
    (*/*) exit 1;;
    (*) prg=$(command -v -- "$prg") || exit 1;;
  esac
fi
dir="$(cd -P -- "$(dirname -- "$prg")" && pwd -P)" || exit 1
prg="$dir/$(basename -- "$prg")" || exit 1
printf '%s\n' "$dir"

exit 0