diff --git a/desktop/sources/index.html b/desktop/sources/index.html
index d3a5353..955ce4b 100644
--- a/desktop/sources/index.html
+++ b/desktop/sources/index.html
@@ -45,6 +45,7 @@
       ronin.controller.add("default","View","Zoom Out",() => { ronin.modZoom(-0.25) },"CmdOrCtrl+-")
       ronin.controller.add("default","View","Zoom Reset",() => { ronin.modZoom(1,true) },"CmdOrCtrl+0")
       ronin.controller.add("default","View","Toggle Commander",() => { ronin.commander.toggle(); },"CmdOrCtrl+K");
+      ronin.controller.add("default","View","Expand Commander",() => { ronin.commander.toggle(true); },"CmdOrCtrl+Shift+K");
       ronin.controller.add("default","Project","Run",() => { ronin.commander.run(); },"CmdOrCtrl+R");
       ronin.controller.add("default","Project","Reload Run",() => { ronin.source.revert(); ronin.commander.run(); },"CmdOrCtrl+Shift+R");
       ronin.controller.add("default","Project", "Animate",() => { ronin.animate(!ronin.always); },"CmdOrCtrl+Shift+T");
diff --git a/desktop/sources/links/main.css b/desktop/sources/links/main.css
index 8abe5c2..4a9d7de 100644
--- a/desktop/sources/links/main.css
+++ b/desktop/sources/links/main.css
@@ -7,6 +7,7 @@ body { margin:0px; padding:0px; overflow:hidden; font-family:"input_mono_regular
 #ronin #wrapper #commander { z-index: 9000;position: relative;width: 310px;height: calc(100vh - 60px);-webkit-app-region: no-drag;padding-right: 30px;transition: margin-left 250ms;}
 #ronin #wrapper #commander textarea { background: none; width: 100%; height: calc(100vh - 105px); resize: none; font-size: 12px;line-height: 15px; padding-right: 15px}
 #ronin #wrapper #commander div#status { position: absolute; bottom: 0px; text-transform: lowercase;}
+#ronin.expand #wrapper #commander { width:100%; }
 #ronin.hidden #wrapper #commander { margin-left:-331px; }
 
 #ronin canvas#surface,#ronin canvas#guide { position: absolute; top:0px; -webkit-user-select: none;-webkit-app-region: no-drag; background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='20' height='20'><circle cx='10' cy='10' r='1' fill='%23555'></circle></svg>"); background-size: 10px 10px; background-position: -4px -4px; width:100%; height:100%; left:340px; transition: left 250ms}
diff --git a/desktop/sources/scripts/commander.js b/desktop/sources/scripts/commander.js
index b7aae9b..5dbbbf7 100644
--- a/desktop/sources/scripts/commander.js
+++ b/desktop/sources/scripts/commander.js
@@ -188,9 +188,9 @@ function Commander (ronin) {
 
   // Display
 
-  this.show = function () {
+  this.show = function (expand = false) {
     if (this.isVisible === true) { return }
-    ronin.el.className = ''
+    ronin.el.className = expand ? 'expand' : ''
     this.isVisible = true
   }
 
@@ -200,9 +200,9 @@ function Commander (ronin) {
     this.isVisible = false
   }
 
-  this.toggle = function () {
+  this.toggle = function (expand = false) {
     if (this.isVisible !== true) {
-      this.show()
+      this.show(expand)
     } else {
       this.hide()
     }
diff --git a/desktop/sources/scripts/library.js b/desktop/sources/scripts/library.js
index 7bd7b3e..f15c2bd 100644
--- a/desktop/sources/scripts/library.js
+++ b/desktop/sources/scripts/library.js
@@ -60,6 +60,12 @@ function Library (ronin) {
     return rect
   }
 
+  // Strings
+
+  this.concat = function (...items) {
+    return items.reduce((acc, item) => { return `${acc}${item}` }, '')
+  }
+
   // Math
 
   this.add = (...args) => { // Adds values.
@@ -319,7 +325,17 @@ function Library (ronin) {
     return ronin.surface.open(path)
   }
 
-  this.folder = (path = ronin.source.path) => { // Returns the content of a folder path.
+  // File System
+
+  this.path = (path = ronin.source.path) => { // Returns the content of a folder path.
+    return path
+  }
+
+  this.folder = (path = this.path()) => { // Returns the path of the current folder.
+    return require('path').dirname(path)
+  }
+
+  this.ls = (path = this.folder()) => { // Returns the content of a folder path.
     return fs.existsSync(path) ? fs.readdirSync(path) : []
   }
 
diff --git a/examples/animate.lisp b/examples/animate.lisp
index ed3eadf..4adaf64 100644
--- a/examples/animate.lisp
+++ b/examples/animate.lisp
@@ -1,13 +1,17 @@
 ; animate
-
 (
-  (clear)
-  (def t (sin (div (time) 100)))
-
-  (def pos (add 200 30 (mul 30 t)))
-  (defn square (a) (rect a a a a))
-  (stroke (square pos) 1 "red")
-
+  (clear) 
+  (def t 
+    (sin 
+      (div 
+        (time) 100))) 
+  (def pos 
+    (add 200 30 
+      (mul 30 t))) 
+  (defn square 
+    (a) 
+    (rect a a a a)) 
+  (stroke 
+    (square pos) 1 "red") 
   ; set false to stop 
-  (animate true)
-)
\ No newline at end of file
+  (animate true))
\ No newline at end of file
diff --git a/examples/fs.lisp b/examples/fs.lisp
new file mode 100644
index 0000000..0c624bb
--- /dev/null
+++ b/examples/fs.lisp
@@ -0,0 +1,11 @@
+; filesystem
+( 
+  ; get files 
+  (def files 
+    (ls 
+      (folder))) 
+  ; print files count 
+  (echo 
+    (concat "Current folder: " 
+      (folder) " contains " 
+      (len files) " files"))))
\ No newline at end of file