osh_dir_std 0.8.4

#!/usr/bin/env bash
# SPDX-FileCopyrightText: 2022 Robin Vobruba <hoijui.quaero@gmail.com>
# SPDX-License-Identifier: AGPL-3.0-or-later
#
# See the output of "$0 -h" for details.

# Exit immediately on each error and unset variable;
# see: https://vaneyckt.io/posts/safer_bash_scripts_with_set_euxo_pipefail/
set -Eeuo pipefail
#set -Eeu

#script_dir=$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")
build_dir="$(pwd)/build"

APP_NAME="Project build cleaner"

# parameters

function print_help() {

	script_name="$(basename "$0")"
	echo -e ""
	echo -e "$APP_NAME - Removes everything within the build dir."
	echo -e ""
	echo -e "Usage:"
	echo -e "\t$script_name"
	echo -e "Options:"
	echo -e "\t-h, --help"
	echo -e "\t\tPrint this usage help and exit"
	echo -e "Examples:"
	echo -e "\t$script_name"
	echo -e ""
}

# Process command line arguments
while [[ $# -gt 0 ]]
do
	arg="$1"
	shift # $2 -> $1, $3 -> $2, ...

	case "$arg" in
		-h|--help)
			print_help
			exit 0
			;;
		-*) # unknown switch
			>&2 echo "ERROR: Unknown switch '$arg'"
			exit 1
			;;
		*) # non-switch
			POSITIONAL+=("$arg") # save it in an array for later
			;;
	esac
done
set -- "${POSITIONAL[@]}" # restore positional parameters

if [ -d "$build_dir" ]
then
	rm -Rf "${build_dir:?}/"*
fi