cli: cd command - allow tab completion for subdirectories as well

Example:

[/]$ cd
dev tmp tests   usr etc console java
[/]$ cd usr/{TAB}
lib share
[/]$ cd usr/lib/{TAB}
jvm jni
[/]$ cd usr/lib/jv{TAB}m/{TAB}jre/{TAB}lib/{TAB}amd64/{ENTER}
headless    server
[/usr/lib/jvm/jre/lib/amd64]$

console/cd.js

@@ -39,7 +39,34 @@ var cd = {
     },
     
     tab: function(inp) {
-        return (ls.ls_dirs());
+        if (inp.length == 1) {
+            return (ls.ls_dirs());
+        }
+        
+        if (inp.length > 2) {
+            return ([]);
+        }
+        
+        arg = inp[1];
+        if (arg.indexOf('/') == -1) {
+            return (ls.ls_dirs());
+        }
+        
+        last_slash = arg.lastIndexOf('/');
+        dir = arg.substring(0, last_slash);
+        
+        dirs = ls.ls_dirs(dir);
+        arr = [];
+        for (var i=0; i<dirs.length; i++) {
+            arr[i] = dir + '/' + dirs[i];
+        }
+        
+        return (arr);
+    },
+    
+    tab_pretty: function(arg) {
+        last_slash = arg.lastIndexOf('/');
+        return (arg.substring(last_slash+1));
     },
     
     tab_final: function(found_match) {