added is_preload flag

Author: Petr Glotov

webpack_loader/templatetags/webpack_loader.py

@@ -8,8 +8,8 @@
 
 
 @register.simple_tag
-def render_bundle(bundle_name, extension=None, config='DEFAULT', attrs=''):
-    tags = utils.get_as_tags(bundle_name, extension=extension, config=config, attrs=attrs)
+def render_bundle(bundle_name, extension=None, config='DEFAULT', attrs='', is_preload=False):
+    tags = utils.get_as_tags(bundle_name, extension=extension, config=config, attrs=attrs, is_preload=is_preload)
     return mark_safe('\n'.join(tags))
 
 
@@ -19,6 +19,8 @@ def webpack_static(asset_name, config='DEFAULT'):
 
 
 assignment_tag = register.simple_tag if VERSION >= (1, 9) else register.assignment_tag
+
+
 @assignment_tag
 def get_files(bundle_name, extension=None, config='DEFAULT'):
     """

webpack_loader/utils.py

@@ -2,7 +2,6 @@
 
 from .loader import WebpackLoader
 
-
 _loaders = {}
 
 
@@ -31,7 +30,7 @@ def get_files(bundle_name, extension=None, config='DEFAULT'):
     return list(_get_bundle(bundle_name, extension, config))
 
 
-def get_as_tags(bundle_name, extension=None, config='DEFAULT', attrs=''):
+def get_as_tags(bundle_name, extension=None, config='DEFAULT', attrs='', is_preload=False):
     '''
     Get a list of formatted <script> & <link> tags for the assets in the
     named bundle.
@@ -51,8 +50,8 @@ def get_as_tags(bundle_name, extension=None, config='DEFAULT', attrs=''):
             ).format(chunk['url'], attrs))
         elif chunk['name'].endswith(('.css', '.css.gz')):
             tags.append((
-                '<link type="text/css" href="{0}" rel="stylesheet" {1}/>'
-            ).format(chunk['url'], attrs))
+                '<link type="text/css" href="{0}" rel={2} {1}/>'
+            ).format(chunk['url'], attrs, '"stylesheet"' if not is_preload else '"preload" as="style"'))
     return tags