add the ability to specify the content license in the footer

e.g. for marking all pages as CC BY-SA 4.0

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

incorporealcms/templates/base.html

@@ -44,7 +44,11 @@ SPDX-License-Identifier: GPL-3.0-or-later
     </div>
     <footer>
         {% if extra_footer %}<div class="extra-footer"><i>{{ extra_footer|safe }}</i></div>{% endif %}
-        <div class="footer"><i>Last modified: {{ mtime }}</i></div>
+        <div class="footer">
+            <i>Last modified: {{ mtime }}.<br />
+               {% if config.LICENSE %} Available via {{ config.LICENSE|safe }}{% endif %}.
+            </i>
+        </div>
     </footer>
     {% endblock %}
 </div>

tests/test_markdown.py

@@ -217,3 +217,15 @@ def test_index_in_source_link_is_stripped():
     assert '<a href=".#anchor">Anchored This Index</a>' in content
     assert '<a href="../">Parent</a>' in content
     assert '<a href="../#anchor">Anchored Parent</a>' in content
+
+
+def test_license_link():
+    """Test that the config's license HTML is displayed in the footer."""
+    with patch('incorporealcms.Config.LICENSE',
+               '<a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>', create=True):
+        assert 'Available via <a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.'\
+            in handle_markdown_file_path('index.md', PAGES_DIR)
+
+    # default, no config
+    assert '<a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>'\
+        not in handle_markdown_file_path('index.md', PAGES_DIR)