SH_MAIN_NAME="main.sh"
SH_NAME="sh"
SH_SHELL="$(cat /proc/${$}/comm)"

SH_ROOT="/etc/${SH_NAME}"
SH_USER="${HOME}/${SH_NAME}"

SH_MAIN="${SH_ROOT}/${SH_MAIN_NAME}"

[ -n "${ENV}" ] || export ENV="${SH_MAIN}"

sh_source_check() {
	local file=".shellcheck.sh"
	find \
		"." \
		-type "f" \
		-name "*.sh" \
		-not \
		-name "${file}" \
		-printf ". \"%P\"\n" \
		>"${file}"
	shellcheck \
		--check-sourced \
		"${file}"
	rm "${file}"
}

sh_source_find() {
	local root="${1}"
	local file="${2}"
	set -- \
		"${root}" \
		-name "*.sh" \
		-type "f"
	[ -n "${file}" ] &&
		set -- "${@}" \
			-not \
			-name "${file}"
	find "${@}" \
		-printf "%P\n" |
		sort
}

_sh_main_commands() {
	local file="${1}"
	grep "()" "${file}" |
		cut --delimiter "(" --fields 1
}

_sh_main_log() {
	case "${-}" in
	*i*)
		local argument
		for argument in "${@}"; do
			echo "${argument}"
		done
		;;
	*) ;;
	esac
}

main_source_directory() {
	local path="${1}"
	if [ -d "${path}" ]; then
		local cmd count ifs module modules
		modules="$(sh_source_find "${path}" "${SH_MAIN_NAME}")"
		ifs="${IFS}"
		IFS="
"
		count=0
		_sh_main_log "" \
			". ${path}"
		for module in ${modules}; do
			count=$((count + 1))
			#printf "%02d" "${count}"
			_sh_main_log "${module%.sh}"
			module="${path}/${module}"
			# shellcheck disable=SC1090
			. "${module}"
			cmd="$(_sh_main_commands "${module}")"
			if [ -n "${cmd}" ]; then
				[ -n "${CMD}" ] && CMD="${CMD}
"
				CMD="${CMD}${cmd}"
			fi
		done
		IFS="${ifs}"
	else
		_sh_main_log "Not a directory: ${path}"
		return 1
	fi
}

main_source_file() {
	local path="${1}"
	if [ -f "${path}" ]; then
		main_source_directory "$(dirname "${path}")"
	else
		_sh_main_log "Not a file: ${path}"
		return 1
	fi
}

_sh_main() {
	main_source_file "${ENV}"
	main_source_directory "${SH_USER}"
	_sh_main_log "" \
		"sh_… = shell functions" \
		"a__… = aliases" \
		"u__… = user"
}

_sh_main