diff --git a/src/app/files.js b/src/app/files.js
index 53b53451e1..42aa3f6c90 100644
--- a/src/app/files.js
+++ b/src/app/files.js
@@ -107,6 +107,47 @@ function Files (storage) {
     return files
   }
 
+  //
+  // Tree model for files
+  // {
+  //   'a': { }, // empty directory 'a'
+  //   'b': {
+  //     'c': {}, // empty directory 'b/c'
+  //     'd': { '/readonly': true, '/content': 'Hello World' } // files 'b/c/d'
+  //     'e': { '/readonly': false, '/path': 'b/c/d' } // symlink to 'b/c/d'
+  //     'f': { '/readonly': false, '/content': '<executable>', '/mode': 0755 }
+  //   }
+  // }
+  //
+  this.listAsTree = function () {
+    function hashmapize (obj, path, val) {
+      var nodes = path.split('/')
+      var i = 0
+
+      for (; i < nodes.length - 1; i++) {
+        var node = nodes[i]
+        if (obj[node] === undefined) {
+          obj[node] = {}
+        }
+        obj = obj[node]
+      }
+
+      obj[nodes[i]] = val
+    }
+
+    var tree = {}
+
+    var self = this
+    storage.keys().forEach(function (path) {
+      hashmapize(tree, path, {
+        '/readonly': self.isReadOnly(path),
+        '/content': self.get(path)
+      })
+    })
+
+    return tree
+  }
+
   // rename .browser-solidity.json to .remix.config
   if (this.exists('.browser-solidity.json')) {
     this.rename('.browser-solidity.json', '.remix.config')