Cleanup folder before generating output

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/utils/fs.js b/lib/utils/fs.js
index 3f97096..da22fdb 100644
--- a/lib/utils/fs.js
+++ b/lib/utils/fs.js
@@ -129,6 +129,22 @@ function pickFile(rootFolder, fileName) {
     return undefined;
 }
 
+/**
+    Ensure that a directory exists and is empty
+
+    @param {String} folder
+    @return {Promise}
+*/
+function ensureFolder(rootFolder) {
+    return rmDir(rootFolder)
+    .fail(function() {
+        return Promise();
+    })
+    .then(function() {
+        return Promise.nfcall(mkdirp, rootFolder);
+    });
+}
+
 module.exports = {
     exists: fileExists,
     existsSync: fs.existsSync,
@@ -148,5 +164,6 @@ module.exports = {
     download: download,
     uniqueFilename: uniqueFilename,
     ensureFile: ensureFile,
+    ensureFolder: ensureFolder,
     rmDir: rmDir
 };