added popular exploration, added order:rank

app/logical/pixiv_proxy.rb

@@ -4,7 +4,7 @@ class PixivProxy
   end
   
   def self.get(url)
-    if url =~ /\/(\d+)(_m)?\.(jpg|jpeg|png|gif)/i
+    if url =~ /\/(\d+)(_m|_p\d+)?\.(jpg|jpeg|png|gif)/i
       url = "http://www.pixiv.net/member_illust.php?mode=medium&illust_id=#{$1}"
       get_single(url)
     elsif url =~ /member_illust\.php/ && url =~ /illust_id=/

app/logical/post_sets/artist.rb

@@ -3,7 +3,7 @@ module PostSets
     attr_reader :artist
     
     def initialize(artist)
-      super(:tags => artist.name)
+      super(artist.name)
       @artist = artist
     end
     

app/logical/post_sets/base.rb

@@ -13,6 +13,7 @@ module PostSets
     end
     
     def artist
+      nil
     end
     
     def is_single_tag?

app/logical/post_sets/popular.rb

@@ -0,0 +1,48 @@
+module PostSets
+  class Popular < Base
+    attr_reader :date, :scale
+    
+    def initialize(date, scale)
+      @date = date.blank? ? Date.today : date.to_date
+      @scale = scale
+    end
+    
+    def posts
+      ::Post.where("created_at between ? and ?", min_date, max_date + 1).order("score desc").limit(limit)
+    end
+    
+    def limit
+      25
+    end
+    
+    def min_date
+      case scale
+      when "week"
+        date.beginning_of_week
+        
+      when "month"
+        date.beginning_of_month
+        
+      else
+        date
+      end
+    end
+    
+    def max_date
+      case scale
+      when "week"
+        date.end_of_week
+        
+      when "month"
+        date.end_of_month
+        
+      else
+        date
+      end
+    end
+
+    def presenter
+      ::PostSetPresenters::Popular.new(self)
+    end
+  end
+end