major refactoring of post sets and pagination, incomplete

app/presenters/paginators/numbered.rb

@@ -0,0 +1,58 @@
+module Paginators
+  class Numbered
+    attr_reader :template, :source
+    delegate :url, :total_pages, :current_page, :to => :source
+    
+    def initialize(template, source)
+      @template = template
+      @source = source
+    end
+    
+    def pagination_html
+      html = "<menu>"
+      window = 3
+      if total_pages <= (window * 2) + 5
+        1.upto(total_pages) do |page|
+          html << pagination_item(page, current_page)
+        end
+      elsif current_page <= window + 2
+        1.upto(current_page + window) do |page|
+          html << pagination_item(page, current_page)
+        end
+        html << pagination_item("...", current_page)
+        html << pagination_item(total_pages, current_page)
+      
+      elsif current_page >= total_pages - (window + 1)
+        html << pagination_item(1, current_page)
+        html << pagination_item("...", current_page)
+        (current_page - window).upto(total_pages) do |page|
+          html << pagination_item(page, current_page)
+        end
+      else
+        html << pagination_item(1, current_page)
+        html << pagination_item("...", current_page)
+        (current_page - window).upto(current_page + window) do |page|
+          html << pagination_item(page, current_page)
+        end
+        html << pagination_item("...", current_page)
+        html << pagination_item(total_pages, current_page)
+      end
+      html << "</menu>"
+      html.html_safe
+    end
+
+  protected
+    def pagination_item(page, current_page)
+      html = "<li>"
+      if page == "..."
+        html << "..."
+      elsif page == current_page
+        html << page.to_s
+      else
+        html << template.link_to(page, url(template, :page => page))
+      end
+      html << "</li>"
+      html.html_safe
+    end
+  end
+end

app/presenters/paginators/post.rb

@@ -15,6 +15,7 @@ module Paginators
         [1, post_set.page].max
       end
       
+      # TODO: this is not compatible with paginating favorites
       def sequential_link(template)
         template.posts_path(:tags => template.params[:tags], before_id => post_set.posts[-1].id, :page => nil)
       end

app/presenters/paginators/sequential.rb

@@ -0,0 +1,29 @@
+module Paginators
+  class Sequential
+    attr_reader :template, :source
+    delegate :url, :to => :source
+    
+    def initialize(template, source)
+      @template = template
+      @source = source
+    end
+    
+    def pagination_html
+      html = "<menu>"
+      html << '<li>' + template.link_to("&laquo; Previous", prev_url) + '</li>'
+      if next_url
+        html << '<li>' + template.link_to("Next &raquo;", next_url) + '</li>'
+      end
+      html << "</menu>"
+      html.html_safe
+    end
+    
+    def prev_url
+      template.request.env["HTTP_REFERER"] 
+    end
+    
+    def next_url
+      @next_url ||= url(template)
+    end
+  end
+end