Add unpack state, command not found errors

app/classes/logical/UniversalPath.js

@@ -63,6 +63,16 @@ class UniversalPath extends Injectable {
         return path.dirname(this.path)
     }
 
+    async parent() {
+        await this.classify()
+        if ( this.is_directory() ) return path.resolve(this.path, '..')
+        return this.directory()
+    }
+
+    name() {
+        return path.basename(this.path)
+    }
+
     async classify() {
         const dir_result = await this._host.execute(`${this._directory_classify_command} ${this._path}`)
         if ( dir_result.exit_code === 0 ) {

app/classes/logical/error/CommandNotFoundError.js

@@ -0,0 +1,5 @@
+class CommandNotFoundError extends Error {
+
+}
+
+module.exports = exports = CommandNotFoundError