Add assets_ignore init keyword, regex filter for the assets files.

T4rk1n · T4rk1n · commit 520d00b48644 · 2018-08-17T16:36:08.000-04:00
diff --git a/dash/dash.py b/dash/dash.py
@@ -73,9 +73,10 @@ def __init__(
             static_folder='static',
             assets_folder=None,
             assets_url_path='/assets',
+            assets_ignore='',
+            include_assets_files=True,
+            url_base_pathname='/',
             assets_external_path=None,
-            include_assets_files=None,
-            url_base_pathname=None,
             requests_pathname_prefix=None,
             routes_pathname_prefix=None,
             compress=True,
@@ -158,6 +159,8 @@ def _handle_error(error):
         self._external_scripts = external_scripts or []
         self._external_stylesheets = external_stylesheets or []
 
+        self.assets_ignore = assets_ignore
+
         self.registered_paths = {}
 
         # urls
@@ -898,6 +901,8 @@ def _setup_server(self):
     def _walk_assets_directory(self):
         walk_dir = self._assets_folder
         slash_splitter = re.compile(r'[\\/]+')
+        ignore_filter = re.compile(self.assets_ignore) \
+            if self.assets_ignore else None
 
         def add_resource(p, filepath):
             res = {'asset_path': p, 'filepath': filepath}
@@ -917,7 +922,10 @@ def add_resource(p, filepath):
                 else:
                     base = splitted[0]
 
-            for f in sorted(files):
+            files_gen = (x for x in files if not ignore_filter.search(x)) \
+                if ignore_filter else files
+
+            for f in sorted(files_gen):
                 if base:
                     path = '/'.join([base, f])
                 else:
diff --git a/tests/assets/load_ignored.js b/tests/assets/load_ignored.js
@@ -0,0 +1 @@
+window.tested = 'IGNORED'; // Break the chain.
diff --git a/tests/test_integration.py b/tests/test_integration.py
@@ -363,7 +363,8 @@ def test_index_customization(self):
         self.percy_snapshot('custom-index')
 
     def test_assets(self):
-        app = dash.Dash(assets_folder='tests/assets')
+        app = dash.Dash(assets_folder='tests/assets',
+                        assets_ignore='.*ignored.*')
         app.index_string = '''
         <!DOCTYPE html>
         <html>

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+window.tested = 'IGNORED'; // Break the chain.`