diff --git a/.zed/settings.json b/.zed/settings.json
new file mode 100644
index 0000000..31a49c4
--- /dev/null
+++ b/.zed/settings.json
@@ -0,0 +1,8 @@
+// Folder-specific settings
+//
+// For a full list of overridable settings, and general information on folder-specific settings,
+// see the documentation: https://zed.dev/docs/configuring-zed#settings-files
+{
+  "hard_tabs": true,
+  "tab_size": 4
+}
diff --git a/src/rt/rfwfs/fs/library.ts b/src/rt/rfwfs/fs/library.ts
index 6257ee6..1c73023 100644
--- a/src/rt/rfwfs/fs/library.ts
+++ b/src/rt/rfwfs/fs/library.ts
@@ -1,23 +1,59 @@
 import { ReadStatus } from "../enum"
-import rfwfs, { type EntryCollection, type Entry } from "../main"
+import rfwfs, { type EntryCollection, type Entry, RfwfsDirectory } from "../main"
 
+import wrap, { wrap_none, WrapResult, WrapResultEntry, WrapResultNone } from "../wrap"
 import fs from "./root"
 
+const enum TraverseStatus {
+	Ok,
+	Denied,
+	TargetMissing,
+	NotFound,
+}
+
 let username: string = "user"
+
 const libhome = {} as LibHome
 
 interface WorkingDir<T extends Entry> {
 	entry?: EntryCollection<T>,
-	path: string[]
+
 }
 interface LibHome {
 	path: () => string[],
 	get: <T extends Entry>() => EntryCollection<T>,
 }
 
-function traverse_to_goal(path: string[]) {
-	if (working_dir.entry) {
+function working_path_result(find: WrapResultEntry<EntryCollection<Entry>, ReadStatus>): WrapResult<TraverseStatus> {
+	// switch(find.some) {
+	// 	case ReadStatus.Ok: {
+	// 		return wrap(TraverseStatus.Ok, find.result)
+	// 	}
+	// 	case ReadStatus.NotFound: {
+	// 	}
+	// 	case ReadStatus.Denied: {
 
+	// 	}
+	// }
+	if (find.some === ReadStatus.Ok) {
+		if (find.result) {
+			return wrap(TraverseStatus.Ok)
+		} else {
+		}
+	} else if (find.some === ReadStatus.Denied) {
+
+	} else if (find.some === ReadStatus.NotFound) {
+
+	}
+	return wrap_none(TraverseStatus.NotFound)
+}
+
+function traverse_to_goal(working_path: string[]) {
+	let working_dir = fs.inner
+
+	for (const dir_name of working_path) {
+		const find = working_dir.find(dir_name)
+		const h = working_path_result(find)
 	}
 }
 
diff --git a/src/rt/rfwfs/fs/root.ts b/src/rt/rfwfs/fs/root.ts
index 524147b..6079ab7 100644
--- a/src/rt/rfwfs/fs/root.ts
+++ b/src/rt/rfwfs/fs/root.ts
@@ -5,13 +5,14 @@ import rfwfs from "../main"
 const time_now = (Date.now()/1000)|0
 
 // ------------ Home ------------
-const config    = rfwfs.directory(".config",   Permissions.rw, time_now)
-const local     = rfwfs.directory(".local",    Permissions.rw, time_now)
-const downloads = rfwfs.directory("Downloads", Permissions.rw, time_now)
-const pictures  = rfwfs.directory("Pictures",  Permissions.rw, time_now)
-const desktop   = rfwfs.directory("Desktop",   Permissions.rw, time_now)
-const videos    = rfwfs.directory("Videos",    Permissions.rw, time_now)
-const music     = rfwfs.directory("Music",     Permissions.rw, time_now)
+const
+	config    = rfwfs.directory(".config",   Permissions.rw, time_now),
+	local     = rfwfs.directory(".local",    Permissions.rw, time_now),
+	downloads = rfwfs.directory("Downloads", Permissions.rw, time_now),
+	pictures  = rfwfs.directory("Pictures",  Permissions.rw, time_now),
+	desktop   = rfwfs.directory("Desktop",   Permissions.rw, time_now),
+	videos    = rfwfs.directory("Videos",    Permissions.rw, time_now),
+ 	music     = rfwfs.directory("Music",     Permissions.rw, time_now);
 
 const user = rfwfs.directory("user", Permissions.r, time_now, [
 	config,
diff --git a/src/rt/rfwfs/result.ts b/src/rt/rfwfs/result.ts
new file mode 100644
index 0000000..94fcbce
--- /dev/null
+++ b/src/rt/rfwfs/result.ts
@@ -0,0 +1,24 @@
+const enum Status {
+	Ok,
+	Err
+}
+
+type OkResult<T> = [Status.Ok, T];
+type ErrResult<T extends Error> = [Status.Err, T]
+
+type Result<T, U extends Error> = OkResult<T> | ErrResult<U>;
+
+const Ok = <T>(value: T) => [Status.Ok, value] satisfies OkResult<T>;
+const Err = <T extends Error>(value: T) => [Status.Err, value] satisfies ErrResult<T>;
+
+const execute = <T>(value: T): Result<T, Error> => {
+	return Math.random() > 0.5 ? Ok(value) : Err(new Error("boom"));
+}
+
+const result = execute("whatever");
+
+if (result[0] === Status.Ok) {
+	const value = result[1]; // it have to be string
+} else {
+	const value = result[1]; // it have to be error
+}
\ No newline at end of file