use flask-bootstrap util to display flashed messages

prolefeeder.py

@@ -28,10 +28,10 @@ def download():
         form.start_time.data = datetime.now() - timedelta(hours=1)
         form.length.data = 60
     elif form.validate_on_submit():
-        flash('The download should start immediately.')
+        flash('The download should start immediately.', 'success')
         return render_template('download.html', form=form, filename='test.mp3')
     else:
-        flash('Error')
+        flash('Error', 'warning')
     return render_template('download.html', form=form)
 
 

templates/base.html

@@ -1,16 +1,11 @@
 {% extends "bootstrap/base.html" %}
+{% import "bootstrap/utils.html" as utils %}
 
 {% block title %}Prolefeeder{% endblock %}
 {% block content %}
 <div class="container">
 
-{% with messages = get_flashed_messages() %}
+{{ utils.flashed_messages() }}
-{% if messages %}
-    {% for message in messages %}
-    <div class="alert alert-info" role="alert">{{ message }}</div>
-    {% endfor %}
-{% endif %}
-{% endwith %}
 
 {% block app_content %}
 {% endblock %}