add current index method, fix #36

README.md

@@ -96,6 +96,7 @@ stop    | Stop the switching
 toggle  | Toggle between start/stop
 reset   | Return to the first switching
 select  | Select the switching at index
+current | Return current index
 next    | Go to the next switching
 prev    | Go to the previous switching
 destroy | !!Destroy BgSwitcher!!

jquery.bgswitcher.js

@@ -217,6 +217,13 @@
       this.switching();
     },
 
+    /**
+     * Return current index
+     */
+    current: function() {
+      return this.index
+    },
+
     /**
      * Switching the background image
      */

test/bg_switcher_spec.js

@@ -267,6 +267,19 @@ describe('jQuery.BgSwitcher', function() {
     });
   });
 
+  describe('#current', function() {
+    beforeEach(function() {
+      bs.setConfig({images: ['foo', 'bar', 'baz']});
+    });
+
+    it('return current index', function() {
+      bs.select(2);
+      expect(bs.current()).to.be(2);
+      bs.prev();
+      expect(bs.current()).to.be(1);
+    });
+  });
+
   describe('#switching', function() {
     beforeEach(function() {
       bs.setConfig({interval: INTERVAL});