currentPath and add to API

src/app.js

@@ -569,6 +569,9 @@ function run () {
     fileProvider: (name) => {
       return self._api.filesProviders[name]
     },
+    currentPath: function () {
+      return fileManager.currentPath()
+    },
     getBalance: (address, callback) => {
       udapp.getBalance(address, (error, balance) => {
         if (error) {

src/app/files/fileManager.js

@@ -79,6 +79,13 @@ class FileManager {
     this.refreshTabs()
   }
 
+  currentPath () {
+    var currentFile = this.opt.config.get('currentFile')
+    var reg = /(.*\/).*/
+    var path = reg.exec(currentFile)
+    return path ? path[1] : null
+  }
+
   fileRemovedEvent (path) {
     if (path === this.opt.config.get('currentFile')) {
       this.opt.config.set('currentFile', '')