fix renaming/removal

src/app.js

@@ -281,6 +281,7 @@ var run = function () {
         if (!files.rename(originalName, newName)) {
           alert('Error while renaming file')
         } else {
+          currentFile = null
           switchToFile(newName)
           editor.discard(originalName)
         }
@@ -301,6 +302,7 @@ var run = function () {
       if (!files.remove(name)) {
         alert('Error while removing file')
       } else {
+        currentFile = null
         switchToNextFile()
         editor.discard(name)
       }
@@ -666,23 +668,28 @@ var run = function () {
 
   function runCompiler () {
     var files = {}
+    if (currentFile) {
       var target = currentFile
-
       files[target] = editor.get(currentFile)
-
       compiler.compile(files, target)
     }
+  }
 
   function editorSyncFile () {
+    if (currentFile) {
       var input = editor.get(currentFile)
       files.set(currentFile, input)
     }
+  }
 
   var previousInput = ''
   var compileTimeout = null
   var saveTimeout = null
 
   function editorOnChange () {
+    if (!currentFile) {
+      return
+    }
     var input = editor.get(currentFile)
 
     // if there's no change, don't do anything

src/app/files.js

@@ -58,7 +58,7 @@ function Files (storage) {
   }
 
   this.isReadOnly = function (path) {
-    return !!readonly[path]
+    return readonly[path] !== undefined
   }
 
   this.remove = function (path) {

src/app/storage.js

@@ -2,7 +2,7 @@
 
 function Storage () {
   this.exists = function (name) {
-    return !!this.get(name)
+    return this.get(name) !== null
   }
 
   this.get = function (name) {