moved related_posts to plugin

pelican/plugins/related_posts.py

@@ -0,0 +1,33 @@
+from pelican import signals
+
+"""
+Related posts plugin for Pelican
+================================
+
+Adds related_posts variable to article's context
+"""
+related_posts = []
+def add_related_posts(generator, metadata):
+    if 'tags' in metadata:
+        for tag in metadata['tags']:
+            #print tag
+            for related_article in generator.tags[tag]:
+                related_posts.append(related_article)
+        
+        if len(related_posts) < 1:
+            return
+        
+        relation_score = dict( \
+                zip(set(related_posts), \
+                map(related_posts.count, \
+                set(related_posts))))
+        ranked_related = sorted(relation_score, key=relation_score.get)
+        ranked_related.reverse()
+        
+        metadata["related_posts"] = ranked_related[:5]
+
+    else:
+        return
+
+def register():
+    signals.article_generate_context.connect(add_related_posts)