add support for saved search metatag + tests

app/logical/post_query_builder.rb

@@ -101,6 +101,27 @@ class PostQueryBuilder
     relation
   end
 
+  def add_saved_search_relation(saved_searches, relation)
+    saved_searches.each do |saved_search|
+      if saved_search =~ /^(.+?):(.+)$/
+        user_name = $1
+        name = $2
+        user = User.find_by_name(user_name)
+        return relation if user.nil?
+        post_ids = SavedSearch.post_ids(user.id, name)
+      else
+        user = User.find_by_name(saved_search)
+        return relation if user.nil?
+        post_ids = SavedSearch.post_ids(user.id, nil)
+      end
+
+      post_ids = [0] if post_ids.empty?
+      relation = relation.where(["posts.id IN (?)", post_ids])
+    end
+
+    relation
+  end
+
   def build(relation = nil)
     unless query_string.is_a?(Hash)
       q = Tag.parse_query(query_string)
@@ -208,6 +229,11 @@ class PostQueryBuilder
       has_constraints!
     end
 
+    if q[:saved_searches]
+      relation = add_saved_search_relation(q[:saved_searches], relation)
+      has_constraints!
+    end
+
     if q[:uploader_id_neg]
       relation = relation.where("posts.uploader_id not in (?)", q[:uploader_id_neg])
     end