diff --git a/sh/main.sh b/sh/main.sh
index 75036ef..8d950b0 100755
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -1,5 +1,4 @@
 #! /usr/bin/env sh
-# main module
 
 # ╭──────╮
 # │ main │
@@ -9,7 +8,6 @@
 # │ main │ constants │
 # ╰──────┴───────────╯
 
-# name of the entrypoint file
 RWX_MAIN_NAME="main.sh"
 RWX_SELF_NAME="rwx"
 
@@ -63,20 +61,44 @@ rwx_main() {
 # │ main │ cache │
 # ╰──────┴───────╯
 
-RWX_CODE=""
-
-# cache source code of a module
 rwx_cache() {
 	local root="${1}"
 	local module="${2}"
 	local name="${module%.sh}"
 	local path="${root}/${module}"
-	local text
+	local fill text
+	fill="$(rwx_fill "${#name}" ─)"
 	text="$(cat "${path}")"
-	RWX_CODE="${RWX_CODE}\
-#↓ ${name}
-${text}
-"
+	case "${text}" in
+	"#!"*)
+		RWX_CODE="${text}
+
+# ╭───┬────┬─${fill}─╮
+# │ ↖ │ sh │ ${name} │
+# ╰───┴────┴─${fill}─╯"
+		;;
+	*)
+		RWX_CODE="${RWX_CODE}
+
+# ╭───┬────┬─${fill}─╮
+# │ ↙ │ sh │ ${name} │
+# ╰───┴────┴─${fill}─╯
+
+${text}"
+		;;
+	esac
+}
+
+# ╭──────┬──────╮
+# │ main │ fill │
+# ╰──────┴──────╯
+
+rwx_fill() {
+	local index="${1}"
+	while [ "${index}" -gt 0 ]; do
+		printf "%s" "${2}"
+		index=$((index - 1))
+	done
 }
 
 # ╭──────┬────────╮
@@ -93,17 +115,16 @@ rwx_source() {
 	count=0
 	__rwx_log "" \
 		". ${root}"
-	local modules="$(rwx_find_shell "${root}" "${file}")"
-	while IFS= read -r module; do
+	rwx_ifs_set
+	for module in $(rwx_find_shell "${root}" "${file}"); do
 		count=$((count + 1))
 		__rwx_log "$(printf "%02d" "${count}") ${module%.sh}"
 		# shellcheck disable=SC1090
 		. "${root}/${module}"
 		# cache code
 		rwx_cache "${root}" "${module}"
-	done <<EOF
-${modules}
-EOF
+	done
+	rwx_ifs_unset
 }
 
 # ╭──────┬─────╮
@@ -188,22 +209,22 @@ rwx_parse() {
 	local func="${ws}(${ws})${ws}{.*"
 	local id="[_a-zA-Z][_a-z0-9A-Z]*"
 	local line
+	rwx_ifs_set
 	RWX_CONSTANTS=""
-	printf "%s\n" "${RWX_CODE}" |
+	for line in $(echo "${RWX_CODE}" |
 		grep "${start}${constant}${setting}" |
-		sed "s|${start}\\(${constant}\\)${setting}|\\1|" |
-		while IFS= read -r line; do
+		sed "s|${start}\\(${constant}\\)${setting}|\\1|"); do
 		RWX_CONSTANTS="${RWX_CONSTANTS}${line}
 "
 	done
 	RWX_FUNCTIONS=""
-	printf "%s\n" "${RWX_CODE}" |
+	for line in $(echo "${RWX_CODE}" |
 		grep "${start}${id}${func}" |
-		sed "s|${start}\\(${id}\\)${func}|\\1|" |
-		while IFS= read -r line; do
+		sed "s|${start}\\(${id}\\)${func}|\\1|"); do
 		RWX_FUNCTIONS="${RWX_FUNCTIONS}${line}
 "
 	done
+	rwx_ifs_unset
 }
 
 # ╭──────┬─────╮
diff --git a/sh/self.sh b/sh/self.sh
index a7ebca2..0a8f33e 100644
--- a/sh/self.sh
+++ b/sh/self.sh
@@ -1,50 +1,22 @@
-# self module
-
 # meta doc
 rwx_doc() {
 	local name="${1}"
 	[ -n "${name}" ] || return
-	local constant doc func line module
-	printf "%s\n" "${RWX_CODE}" | while IFS= read -r line; do
-		case "${line}" in
-			"#!"*) doc="" ;;
-			"#↓"*)
-				doc=""
-				module="$(echo "${line}" | sed "s|#↓ \\(.*\\)|\\1|")"
+	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 "${doc}"
+				return
 				;;
-			"#"*)
-				[ -n "${doc}" ] && doc="${doc}
-"
-				doc="${doc}${line}"
-				;;
-			*"="*)
-				constant="$(echo "${line}" | sed "s|^\\(.*\\)=.*|\\1|")"
-				if [ "${constant}" = "${name}" ]; then
-					echo "${doc}"
-					return
-				else
-					doc=""
-				fi
-				;;
-			*"("*")"*"{"*)
-				func="$(echo "${line}" | sed "s|^\\(.*\\)() {.*|\\1|")"
-				if [ "${func}" = "${name}" ]; then
-					echo "${doc}"
-					return
-				else
-					doc=""
-				fi
-				;;
-			*)
-				if [ "${module}" = "${name}" ]; then
-					echo "${doc}"
-					return
-				else
-					doc=""
-				fi
-				;;
-		esac
+			*) doc="" ;;
+			esac
+		done <"${RWX_ROOT_SYSTEM}/${module}"
 	done
+	rwx_ifs_unset
 }
 
 # ╭──────┬───────╮
@@ -155,17 +127,16 @@ export ENV=\"${RWX_MAIN_PATH}\"
 # ╰──────┴────────╯
 
 rwx_self_subset() {
-	local argument file root
+	local argument path
 	for argument in "${@}"; do
-		root="${RWX_ROOT_SYSTEM}/${argument}"
-		file="${argument}.sh"
-		if [ -d "${root}" ]; then
+		path="${RWX_ROOT_SYSTEM}/${argument}"
+		if [ -d "${path}" ]; then
 			local file
-			for file in $(rwx_find_shell "${root}"); do
+			for file in $(rwx_find_shell "${path}"); do
 				echo "${argument}/${file}"
 			done
-		elif [ -f "${RWX_ROOT_SYSTEM}/${file}" ]; then
-			echo "${file}"
+		elif [ -f "${path}" ]; then
+			echo "${argument}"
 		fi
 	done
 }