add callback when existing files are skipped

Readme.md

@@ -364,6 +364,13 @@ Type: `function`
 This function gets called with the S3 keyname as the first parameter if the uploaded file is a new file in the bucket, much like `onChange`.
 
 
+##### onSkippedExisting
+
+Type: `function`
+
+This function gets called with the S3 keyname as the first parameter if the file was skipped because `uploadNewFilesOnly` is set to `true` and a different file with the same name exists on S3.
+
+
 #### uploadNewFilesOnly
 
 Type: `boolean`

index.js

@@ -259,6 +259,10 @@ gulpPrefixer = function (AWS) {
                     } else {
                         fancyLog(colors.gray("Skipping Upload of Existing File ..... "), keyname);
 
+                        if (options.onSkippedExisting && typeof options.onSkippedExisting === 'function') {
+                            options.onSkippedExisting.call(this, keyname);
+                        }
+
                         callback(null);
                     }
 

src/helper.js

@@ -27,6 +27,7 @@ module.exports = {
             'onChange',
             'onNoChange',
             'onNew',
+            'onSkippedExisting',
             'uploadNewFilesOnly',
             'verbose'
         ];