Support multiple scss include paths

Based on a new settings variable called SCSS_INCLUDE_PATHS. By default hshassets/assets/sass/lib is preconfigured.

hshassets/management/commands/watchassets.py

@@ -10,12 +10,16 @@ from watchdog.observers import Observer
 
 class AssetBuildHandler(events.PatternMatchingEventHandler):
 
+    def __init__(self, scss_include_paths, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.scss_include_paths = scss_include_paths
+
     def on_modified(self, event):
         if isinstance(event, events.FileModifiedEvent):
             print('File modified: \033[35m{}\033[0m'.format(event.src_path))
             try:
                 app_name, app_directories = utils.discover_app(event.src_path)
-                utils.build_specific(app_name, app_directories, event.src_path)
+                utils.build_specific(app_name, app_directories, event.src_path, self.scss_include_paths)
             except Exception as e:
                 print('Failed! \033[31m(✖_✖)\033[0m\n')
                 traceback.print_exc()
@@ -47,10 +51,12 @@ class Command(BaseCommand):
 
         observer = Observer()
 
-        build_handler = AssetBuildHandler(patterns=['*.js', '*.sass', '*.scss', '*.css'])
-        image_handler = ImageHandler(patterns=['*'])
+        asset_directories = utils.get_asset_directories()
+        scss_include_paths = utils.get_scss_include_paths(asset_directories)
 
-        for app_name, app_directories in utils.get_asset_directories().items():
+        build_handler = AssetBuildHandler(scss_include_paths, patterns=['*.js', '*.sass', '*.scss', '*.css'])
+        image_handler = ImageHandler(patterns=['*'])
+        for app_name, app_directories in asset_directories.items():
 
             if not os.path.isdir(app_directories['static_path']):
                 os.makedirs(app_directories['static_path'])