async try 1, going to now rework

Author: lee-leonardo

lib/fileTools.js

@@ -11,6 +11,7 @@ var log = require('./log'),
     utils = require('./utils');
 
 var stat = Q.nfbind(fs.stat);
+var PromiseQueue = require('./promiseQueue');
 
 function readFile (source, options, callback) {
   return Q.nfcall(fs.readFile, source, options)
@@ -210,6 +211,42 @@ function folderScanSync(output, directory) {
   });
 }
 
+// utilizes a simple promise queue to
+function folderScan(rootDirectory) {
+  return Q.Promise(function (scanResolve, scanReject) {
+    let queue =  new PromiseQueue();
+    const folders = [];
+    const files = [];
+
+    queue.enqueue(folderScanPromise(queue, rootDirectory, folders, files))
+      .then(() => {
+        scanResolve({
+          folders: folders.reverse(),
+          files: files.reverse()
+        });
+      });
+  });
+}
+
+function folderScanPromise(promiseQueue, directory, folders, files) {
+  // readdir promise
+  return fs.promises.readdir(directory).then(directoryEntries => {
+    // Q.all on the files in the directory
+    return Q.all(directoryEntries.map(entry => {
+      // grab the stats, if directory, then put it in the queue and add it to folders, if a file, add it to files
+      const filePath = path.join(directory, entry);
+      return fs.promises.stat().then(stats => {
+        if (stats.isDirectory()) {
+          folders.push(filePath);
+          promiseQueue.enqueue(folderScanPromise(promiseQueue, filePath, folders, files));
+        } else {
+          files.push(filePath);
+        }
+      });
+    }));
+  });
+}
+
 // Copies the 'source' file to 'target' if it's missing after creating the
 // required directory structure.
 function syncFile (source, target, callback) {