First code commit

example/templates/_messages.html

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+{%- with messages = get_flashed_messages(with_categories=true) -%}
+  {% if messages %}
+    <ul class=flashes>
+    {% for category, message in messages %}
+      <li class="{{ category }}">{{ message }}</li>
+    {% endfor %}
+    </ul>
+  {% endif %}
+{%- endwith %}

example/templates/_nav.html

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+{%- if current_user.is_authenticated() -%}
+  <p>Hello {{ current_user.email }}</p>
+{%- endif %}
+<ul>
+  <li><a href="{{ url_for('index') }}">Index</a></li>
+  <li><a href="{{ url_for('profile') }}">Profile</a></li>
+  {% if current_user.has_role('admin') -%}
+  <li><a href="{{ url_for('admin') }}">Admin</a></li>
+  {% endif -%}
+  {% if current_user.has_role('admin') or current_user.has_role('editor') -%}
+  <li><a href="{{ url_for('admin_or_editor') }}">Admin or Editor</a></li>
+  {% endif -%}
+  <li>
+    {%- if current_user.is_authenticated() -%}
+      <a href="{{ url_for('auth.logout') }}">Log out</a>
+    {%- else -%}
+      <a href="{{ url_for('login') }}">Log in</a>
+    {%- endif -%}
+  </li>
+</ul>

example/templates/index.html

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+{% include "_messages.html" %}
+{% include "_nav.html" %}
+<p>{{ content }}</p>

example/templates/login.html

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+{% include "_messages.html" %}
+{% include "_nav.html" %}
+<form action="{{ url_for('auth.authenticate') }}" method="POST" name="login_form">
+  {{ form.hidden_tag() }}
+  {{ form.username.label }} {{ form.username }}<br/>
+  {{ form.password.label }} {{ form.password }}<br/>
+  {{ form.remember.label }} {{ form.remember }}<br/>
+  {{ form.submit }}
+</form>
+<p>{{ content }}</p>