update createNonClashingName and caller

src/app.js

@@ -3,6 +3,7 @@
 var $ = require('jquery')
 var csjs = require('csjs-inject')
 var yo = require('yo-yo')
+var async = require('async')
 var remixLib = require('remix-lib')
 var EventManager = remixLib.EventManager
 
@@ -463,15 +464,21 @@ Please make a backup of your contracts and start using http://remix.ethereum.org
   function loadFiles (filesSet, fileProvider) {
     if (!fileProvider) fileProvider = 'browser'
 
-    for (var f in filesSet) {
-      var name = helper.createNonClashingName(f, filesProviders[fileProvider])
-      if (helper.checkSpecialChars(name)) {
+    async.each(Object.keys(filesSet), (file, callback) => {
+      helper.createNonClashingName(file, filesProviders[fileProvider],
+      (error, name) => {
+        if (error) {
+          modalDialogCustom.alert('Unexpected error loading the file ' + error)
+        } else if (helper.checkSpecialChars(name)) {
           modalDialogCustom.alert('Special characters are not allowed')
-        return
-      }
-      filesProviders[fileProvider].set(name, filesSet[f].content)
+        } else {
+          filesProviders[fileProvider].set(name, filesSet[file].content)
         }
-    fileManager.switchFile()
+        callback()
+      })
+    }, (error) => {
+      if (!error) fileManager.switchFile()
+    })
   }
 
   // Replace early callback with instant response

src/app/panels/file-panel.js

@@ -224,13 +224,15 @@ function filepanel (appAPI, filesProvider) {
 
   function createNewFile () {
     modalDialogCustom.prompt(null, 'File Name', 'Untitled.sol', (input) => {
-      var newName = filesProvider['browser'].type + '/' + helper.createNonClashingName(input, filesProvider['browser'])
+      filesProvider['browser'].type + '/' + helper.createNonClashingName(input, filesProvider['browser'], (error, newName) => {
+        if (error) return modalDialogCustom.alert('Failed to create file ' + newName + ' ' + error)
         if (!filesProvider['browser'].set(newName, '')) {
           modalDialogCustom.alert('Failed to create file ' + newName)
         } else {
           appAPI.switchFile(newName)
         }
       })
+    })
   }
 
   /**

src/app/tabs/run-tab.js

@@ -161,12 +161,14 @@ function makeRecorder (events, appAPI, appEvents) {
       var fileProvider = appAPI.fileProviderOf(path)
       if (fileProvider) {
         var newFile = path + input
-        newFile = helper.createNonClashingName(newFile, fileProvider, '.json')
+        helper.createNonClashingName(newFile, fileProvider, (error, newFile) => {
+          if (error) return modalDialogCustom.alert('Failed to create file. ' + newFile + ' ' + error)
           if (!fileProvider.set(newFile, txJSON)) {
             modalDialogCustom.alert('Failed to create file ' + newFile)
           } else {
             appAPI.switchFile(newFile)
           }
+        })
       }
     })
   }

src/lib/helper.js

+var async = require('async')
+
 module.exports = {
   shortenAddress: function (address, etherBalance) {
     var len = address.length
@@ -9,7 +11,7 @@ module.exports = {
     var len = data.length
     return data.slice(0, 5) + '...' + data.slice(len - 5, len)
   },
-  createNonClashingName (name, fileProvider) {
+  createNonClashingName (name, fileProvider, cb) {
     var counter = ''
     var ext = 'sol'
     var reg = /(.*)\.([^.]+)/g
@@ -18,10 +20,22 @@ module.exports = {
       name = split[1]
       ext = split[2]
     }
-    while (fileProvider.exists(name + counter + '.' + ext)) {
-      counter = (counter | 0) + 1
+    var exist = true
+    async.whilst(
+      () => { return exist },
+      (callback) => {
+        fileProvider.exists(name + counter + '.' + ext, (error, currentExist) => {
+          if (error) {
+            callback(error)
+          } else {
+            exist = currentExist
+            if (exist) counter = (counter | 0) + 1
+            callback()
           }
-    return name + counter + '.' + ext
+        })
+      },
+      (error) => { cb(error, name + counter + '.' + ext) }
+    )
   },
   checkSpecialChars (name) {
     return name.match(/[/:*?"<>\\'|]/) != null