more work

app/presenters/paginators/base.rb

@@ -0,0 +1,78 @@
+module Paginators
+  class Base < Presenter
+    def sequential_pagination_html(template)
+      html = "<menu>"
+      prev_url = template.request.env["HTTP_REFERER"]
+      next_url = sequential_link(template)
+      html << %{<li><a href="#{prev_url}">&laquo; Previous</a></li>}
+      if post_set.posts.any?
+        html << %{<li><a href="#{next_url}">Next &raquo;</a></li>}
+      end
+      html << "</menu>"
+      html.html_safe
+    end
+  
+    def numbered_pagination_html(template)
+      html = "<menu>"
+      window = 3
+      if total_pages <= (window * 2) + 5
+        1.upto(total_pages) do |page|
+          html << numbered_pagination_item(template, page, current_page)
+        end
+      elsif current_page <= window + 2
+        1.upto(current_page + window) do |page|
+          html << numbered_pagination_item(template, page, current_page)
+        end
+        html << numbered_pagination_item(template, "...", current_page)
+        html << numbered_pagination_item(template, total_pages, current_page)
+      
+      elsif current_page >= total_pages - (window + 1)
+        html << numbered_pagination_item(template, 1, current_page)
+        html << numbered_pagination_item(template, "...", current_page)
+        (current_page - window).upto(total_pages) do |page|
+          html << numbered_pagination_item(template, page, current_page)
+        end
+      else
+        html << numbered_pagination_item(template, 1, current_page)
+        html << numbered_pagination_item(template, "...", current_page)
+        (current_page - window).upto(current_page + window) do |page|
+          html << numbered_pagination_item(template, page, current_page)
+        end
+        html << numbered_pagination_item(template, "...", current_page)
+        html << numbered_pagination_item(template, total_pages, current_page)
+      end
+      html << "</menu>"
+      html.html_safe
+    end
+  
+    protected
+      def numbered_pagination_item(template, page, current_page)
+        html = "<li>"
+        if page == "..."
+          html << "..."
+        elsif page == current_page
+          html << page.to_s
+        else
+          html << link(template, page)
+        end
+        html << "</li>"
+        html.html_safe
+      end
+      
+      def total_pages
+        raise NotImplementedError
+      end
+      
+      def current_page
+        raise NotImplementedError
+      end
+    
+      def sequential_link(template)
+        raise NotImplementedError
+      end
+    
+      def paginated_link(template, page)
+        raise NotImplementedError
+      end
+  end
+end

app/presenters/paginators/post.rb

@@ -0,0 +1,26 @@
+module Paginators
+  class Post < Base
+    attr_accessor :post_set
+    
+    def initialize(post_set)
+      @post_set = post_set
+    end
+    
+    protected
+      def total_pages
+        (post_set.count.to_f / post_set.limit.to_f).ceil
+      end
+      
+      def current_page
+        [1, post_set.page].max
+      end
+      
+      def sequential_link(template)
+        template.posts_path(:tags => template.params[:tags], before_id => post_set.posts[-1].id, :page => nil)
+      end
+    
+      def paginated_link(template, page)
+        template.link_to(page, template.posts_path(:tags => template.params[:tags], :page => page))
+      end
+  end
+end