diff --git a/sh/main.sh b/sh/main.sh
index 63ca6bf..d75695b 100755
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -37,13 +37,17 @@ RWX_MAIN_PATH="${RWX_ROOT_SYSTEM}/${RWX_MAIN_NAME}"
 
 # run initial steps
 rwx_main() {
+	# cache main
+	rwx_cache "${RWX_ROOT_SYSTEM}" "${RWX_MAIN_NAME}"
 	# source system root
-	if ! rwx_source "${RWX_ROOT_SYSTEM}"; then
+	if ! rwx_source "${RWX_ROOT_SYSTEM}" "${RWX_MAIN_NAME}"; then
 		__rwx_log "Not a directory: ${RWX_ROOT_SYSTEM}"
 		return 1
 	fi
 	# source user root
 	rwx_source "${RWX_SELF_USER}"
+	# parse code cache
+	rwx_parse
 	# context / command
 	if [ -n "${RWX_COMMAND_NAME}" ]; then
 		"${RWX_SELF_COMMAND}${RWX_COMMAND_NAME}" "${@}"
@@ -53,26 +57,72 @@ rwx_main() {
 	fi
 }
 
+# ╭──────┬───────╮
+# │ main │ cache │
+# ╰──────┴───────╯
+
+rwx_cache() {
+	local root="${1}"
+	local module="${2}"
+	local name="${module%.sh}"
+	local path="${root}/${module}"
+	local fill text
+	fill="$(rwx_fill "${#name}" ─)"
+	text="$(cat "${path}")"
+	case "${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
+}
+
 # ╭──────┬────────╮
 # │ main │ source │
 # ╰──────┴────────╯
 
 # source code from file path
 rwx_source() {
-	local path="${1}"
-	[ -d "${path}" ] ||
+	local root="${1}"
+	[ -d "${root}" ] ||
 		return 1
+	local file="${2}"
 	local count module
 	count=0
 	__rwx_log "" \
-		". ${path}"
+		". ${root}"
 	rwx_ifs_set
-	for module in $(rwx_find_shell "${path}" "${RWX_MAIN_NAME}"); do
+	for module in $(rwx_find_shell "${root}" "${file}"); do
 		count=$((count + 1))
 		__rwx_log "$(printf "%02d" "${count}") ${module%.sh}"
-		module="${path}/${module}"
 		# shellcheck disable=SC1090
-		. "${module}"
+		. "${root}/${module}"
+		# cache code
+		rwx_cache "${root}" "${module}"
 	done
 	rwx_ifs_unset
 }
@@ -147,6 +197,36 @@ rwx_find_shell() {
 	rwx_find_extension "sh" "${@}"
 }
 
+# ╭──────┬───────╮
+# │ main │ parse │
+# ╰──────┴───────╯
+
+rwx_parse() {
+	local ws="[[:space:]]*"
+	local start="^${ws}"
+	local constant="[_A-Z][_0-9A-Z]*"
+	local setting="=.*"
+	local fn="${ws}(${ws})${ws}{"
+	local id="[_a-zA-Z][_a-z0-9A-Z]*"
+	local line
+	rwx_ifs_set
+	RWX_CONSTANTS=""
+	for line in $(echo "${RWX_CODE}" |
+		grep "${start}${constant}${setting}" |
+		sed "s|${start}\\(${constant}\\)${setting}|\\1|"); do
+		RWX_CONSTANTS="${RWX_CONSTANTS}${line}
+"
+	done
+	RWX_FUNCTIONS=""
+	for line in $(echo "${RWX_CODE}" |
+		grep "${start}${id}${fn}" |
+		sed "s|${start}\\(${id}\\)${fn}.*|\\1|"); do
+		RWX_FUNCTIONS="${RWX_FUNCTIONS}${line}
+"
+	done
+	rwx_ifs_unset
+}
+
 # ╭──────┬─────╮
 # │ main │ run │
 # ╰──────┴─────╯
diff --git a/sh/util.sh b/sh/util.sh
index 38fe29a..13c70f5 100644
--- a/sh/util.sh
+++ b/sh/util.sh
@@ -49,11 +49,9 @@ rwx_remove() {
 }
 
 rwx_root() {
-	if [ "$(id --user)" -eq 0 ]; then
-		return 0
-	else
-		return 1
-	fi
+	local user_id
+	user_id="$(id --user)"
+	[ "${user_id}" -eq 0 ] || return 1
 }
 
 rwx_warn_wipe() {