added rake profile for easier invokation

performance/shopify/paginate.rb

@@ -0,0 +1,93 @@
+class Paginate < Liquid::Block
+  Syntax     = /(#{Liquid::QuotedFragment})\s*(by\s*(\d+))?/
+
+  def initialize(tag_name, markup, tokens)
+    @nodelist = []
+    
+    if markup =~ Syntax
+      @collection_name = $1
+      @page_size = if $2
+        $3.to_i
+      else
+        20
+      end
+      
+      @attributes = { 'window_size' => 3 }
+      markup.scan(Liquid::TagAttributes) do |key, value|
+        @attributes[key] = value
+      end        
+    else
+      raise SyntaxError.new("Syntax Error in tag 'paginate' - Valid syntax: paginate [collection] by number")
+    end
+  
+    super
+  end
+
+  def render(context)
+    @context = context
+
+    context.stack do                      
+      current_page  = context['current_page'].to_i
+
+      pagination = {
+        'page_size'      => @page_size,
+        'current_page'   => 5,
+        'current_offset' => @page_size * 5
+      }
+      
+      context['paginate'] = pagination      
+      
+      collection_size  = context[@collection_name].size      
+
+      raise ArgumentError.new("Cannot paginate array '#{@collection_name}'. Not found.") if collection_size.nil?
+    
+      page_count = (collection_size.to_f / @page_size.to_f).to_f.ceil + 1 
+
+      pagination['items']      = collection_size
+      pagination['pages']      = page_count -1
+      pagination['previous']   = link('&laquo; Previous', current_page-1 )  unless 1 >= current_page
+      pagination['next']       = link('Next &raquo;', current_page+1 )      unless page_count <= current_page+1
+      pagination['parts']      = []
+      
+      hellip_break = false
+      
+      if page_count > 2
+        1.upto(page_count-1) do |page|          
+        
+          if current_page == page
+            pagination['parts'] << no_link(page)        
+          elsif page == 1 
+            pagination['parts'] << link(page, page)
+          elsif page == page_count -1
+            pagination['parts'] << link(page, page)
+          elsif page <= current_page - @attributes['window_size'] or page >= current_page + @attributes['window_size']
+            next if hellip_break
+            pagination['parts'] << no_link('&hellip;') 
+            hellip_break = true
+            next
+          else
+            pagination['parts'] << link(page, page)
+          end
+        
+          hellip_break = false
+        end 
+      end
+      
+      render_all(@nodelist, context)      
+    end
+  end
+    
+  private
+  
+  def no_link(title)
+    { 'title' => title, 'is_link' => false}
+  end
+  
+  def link(title, page)
+    { 'title' => title, 'url' => current_url + "?page=#{page}", 'is_link' => true}
+  end
+  
+  def current_url
+    "/collections/frontpage"
+  end
+end