_plugins/menu.rb

   1 module Jekyll
   2     module MenuFilter
   3         def menu(input, displayurl)
   4             def create_menu(pages, base, displayurl)
   5                 result = Array.new
   6                 for page in pages
   7                     cururl = page['url'].sub('/index.html', '')
   8                     if cururl.start_with?(base) and cururl.count('/') == base.count('/')
   9                         # figure out CSS class
  10                         if cururl == displayurl
  11                             css_class = 'current'
  12                         elsif cururl.start_with?(displayurl)
  13                             css_class = 'child'
  14                         elsif displayurl.start_with?(cururl)
  15                             css_class = 'parent'
  16                         else
  17                             css_class = 'sibling'
  18                         end
  19                         # create menu node
  20                         menu_node = { 'url' => page['url'], 'title' => page['title'], 'class' => css_class }
  21                         # potentially recurse
  22                         if (css_class == 'parent' or css_class == 'current')
  23                             sub_nodes = create_menu(pages, cururl + "/", displayurl)
  24                             if sub_nodes.size > 0
  25                                 menu_node['sub'] = sub_nodes
  26                             end
  27                         end
  28                         # store menu node
  29                         result.push(menu_node)
  30                     end
  31                 end
  32                 result
  33             end
  34
  35             create_menu(input, "", displayurl.sub('/index.html', ''))
  36         end
  37     end
  38 end
  39
  40 Liquid::Template.register_filter(Jekyll::MenuFilter)