# meta doc
rwx_doc() {
	local name="${1}"
	[ -n "${name}" ] || return
	local doc line module
	rwx_ifs_set
	for module in $(rwx_find_shell "${RWX_ROOT_SYSTEM}"); do
		while read -r line; do
			case "${line}" in
			"#"*) doc="${doc}${line}" ;;
			"${name}() {")
				echo "${doc}"
				return
				;;
			*) doc="" ;;
			esac
		done <"${RWX_ROOT_SYSTEM}/${module}"
	done
	rwx_ifs_unset
}

# ╭──────┬───────╮
# │ self │ check │
# ╰──────┴───────╯

# check source code
rwx_self_check() {
	# check format
	rwx_log
	rwx_shfmt "${RWX_ROOT_SYSTEM}"
	# check syntax
	rwx_log
	rwx_shellcheck "${RWX_ROOT_SYSTEM}"
}

# ╭──────┬──────────╮
# │ self │ commands │
# ╰──────┴──────────╯

# get commands from root
rwx_self_commands() {
	grep \
		--directories "recurse" \
		--no-filename \
		"^${RWX_SELF_COMMAND}" "${RWX_ROOT_SYSTEM}" |
		cut --delimiter "(" --fields 1 |
		sed "s|^${RWX_SELF_COMMAND}||"
}

# ╭──────┬───────────╮
# │ self │ functions │
# ╰──────┴───────────╯

# get functions from root
rwx_self_functions() {
	grep \
		--directories "recurse" \
		--no-filename \
		"()" "${RWX_ROOT_SYSTEM}" |
		cut --delimiter "(" --fields 1
}

# ╭──────┬──────╮
# │ self │ help │
# ╰──────┴──────╯

# output help message
rwx_self_help() {
	rwx_log \
		"rwx_… = functions" \
		" a__… = aliases" \
		" u__… = user"
}

# ╭──────┬──────╮
# │ self │ init │
# ╰──────┴──────╯

rwx_self_init() {
	# run interactive extras
	if rwx_shell_interactive; then
		# help
		rwx_log
		rwx_self_help
	fi
}

# ╭──────┬─────────╮
# │ self │ install │
# ╰──────┴─────────╯

_rwx_cmd_rwx_install() { rwx_self_install "${@}"; }
rwx_self_install() {
	local target="${1}"
	local command file root
	# code
	if [ -n "${target}" ]; then
		root="${target}${RWX_ROOT_SYSTEM}"
		rwx_remove "${root}"
		cp --recursive "${RWX_ROOT_SYSTEM}" "${root}"
	fi
	# commands
	root="${target}/usr/local/bin"
	for command in $(rwx_self_commands); do
		file="${root}/${command}"
		rwx_remove "${file}"
		rwx_link "${file}" "${RWX_MAIN_PATH}"
	done
	# sh
	file="${target}/etc/profile.d/${RWX_SELF_NAME}.sh"
	rwx_remove "${file}"
	rwx_file_write "${file}" "\
export ENV=\"${RWX_MAIN_PATH}\"
"
	# bash
	file="${target}/etc/bash.bashrc"
	rwx_remove "${file}"
	rwx_link "${file}" "${RWX_MAIN_PATH}"
}

# ╭──────┬────────╮
# │ self │ subset │
# ╰──────┴────────╯

rwx_self_subset() {
	local argument path
	for argument in "${@}"; do
		path="${RWX_ROOT_SYSTEM}/${argument}"
		if [ -d "${path}" ]; then
			local file
			for file in $(rwx_find_shell "${path}"); do
				echo "${argument}/${file}"
			done
		elif [ -f "${path}" ]; then
			echo "${argument}"
		fi
	done
}

# ╭──────┬───────╮
# │ self │ write │
# ╰──────┴───────╯

rwx_self_write() {
	local target="${1}"
	if [ -n "${target}" ]; then
		shift
		local file text
		text="#! /usr/bin/env sh
"
		rwx_ifs_set
		for file in $(rwx_self_subset "${@}"); do
			text="${text}
$(cat "${RWX_ROOT_SYSTEM}/${file}")
"
		done
		rwx_ifs_unset
		rwx_file_write "${target}" "${text}"
		rwx_shfmt "${target}"
		rwx_shellcheck_file "${target}"
	fi
}