[sync] updated

utils/Sync/sync/data/__init__.py

@@ -1,6 +1,8 @@
 import os
 from io import BytesIO
 
+from utils.fn import combine, lmap
+
 
 class Provider:
     def __init__(self, root):
@@ -29,12 +31,36 @@ class Provider:
         return 0
 
     def get_abs(self, path):
-        abs = os.path.join(self.root, path)
-        return os.path.normpath(abs)
+        a = os.path.join(self.root, path)
+        return os.path.normpath(a)
 
     def get_rel(self, path):
         rel = os.path.relpath(path, self.root)
         return rel
 
     def is_dir(self, path):
-        return False
+        return False
+
+
+def scan_subdirs(provider, ext, path='.'):
+    """
+    Creates flat list of files with specific ext
+    It iterates only one level of sub directories
+    :param provider: instance of Provider
+    :param ext: file extension like .jpg of .pdf for file filtering
+    :param path: optional path prefix
+    :return: list of files relative to provider.root
+    """
+    items = provider.scan(path)
+    items = list(filter(
+        lambda i: provider.is_dir(i),
+        items
+    ))
+
+    items = lmap(
+        lambda folder: provider.type_filter(folder, ext),
+        items
+    )
+
+    items = combine(items)
+    return items