_LOADED_LIBS=()

include() {
	local file
	for file in "${@}"; do
		if [[ -f "${XDG_DATA_HOME}/buddy/lib/${file}.bash" ]]; then
			# shellcheck disable=SC1090
			source "${XDG_DATA_HOME}/buddy/lib/${file}.bash"
		elif [[ -f "${XDG_DATA_HOME}/buddy/lib/${file}.sh" ]]; then
			# shellcheck disable=SC1090
			source "${XDG_DATA_HOME}/buddy/lib/${file}.sh"
		else
			>&2 echo "include unknown: ${file}"
			exit 1
		fi
	done
}

require() {
	local file
	local previous
	for file in "${@}"; do
		for previous in "${_LOADED_LIBS[@]}"; do
			if [[ "${previous}" == "${file}" ]]; then
				continue 2
			fi
		done
		_LOADED_LIBS+=("${file}")
		include "${file}"
	done
}