Layout: Add themes

youtube/__init__.py

@@ -1,7 +1,22 @@
 import flask
+import settings
 yt_app = flask.Flask(__name__)
 yt_app.url_map.strict_slashes = False
 
 @yt_app.route('/')
 def homepage():
     return flask.render_template('home.html', title="Youtube local")
+
+
+theme_names = {
+    0: 'light_theme',
+    1: 'gray_theme',
+    2: 'dark_theme',
+}
+
+@yt_app.context_processor
+def inject_theme_preference():
+    return {
+        'theme_path': '/youtube.com/static/' + theme_names[settings.theme] + '.css',
+    }
+