Указание lastmod в файле sitemap.xml [closes #24]

flatfilecms/templates/sitemap.jinja2

@@ -1,8 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
-   {%- for item in pages %}
+   {%- for item, lastmod in pages %}
    <url>
      <loc>{{data.base_url}}/{{item}}</loc>
+     {%- if lastmod %}
+     <lastmod>{{lastmod}}</lastmod>
+     {%- endif %}
    </url>
    {%- endfor %}
 </urlset>

flatfilecms/views/__init__.py

@@ -53,7 +53,13 @@ def sitemap(self, options={}):
     for name, item in root.walk():
         if not isinstance(item, Folder) and name != 'sitemap.xml' and not next(
             (True for r in ignore if r.match(name)), False):
-            post['pages'].append(name)
+            lastmod = None
+            if isinstance(item,
+                          (YAML, Markdown)) and ('published' in item.page
+                                                 or 'updated' in item.page):
+                lastmod = (item.page.get('updated')
+                           or item.page.get('published')).strftime('%Y-%m-%d')
+            post['pages'].append((name, lastmod))
     set_content_type(self, 'text/xml')
     return render_to_response(
         '{0}.jinja2'.format(post.get('template', 'sitemap')),