Interlink - MediaWiki-style link generation for Webby

interlink.rb

module Webby
class Renderer
  attr_reader :page
end
end

# To use add interlink to the list of filters in the layout.
# Creates links to pages using a MediaWiki-style syntax:
#
# [[main-page]]
# <a href="/main-page.html">Main Page Title</a>
#
# [[Main Page Title]]
# <a href="/main-page.html">Main Page Title</a>
#
# [[main-page|other text]]
# <a href="/main-page.html">other text</a>
Webby::Filters.register :interlink do |input, cursor|

  renderer = cursor.renderer
  page = cursor.page
  pages = Webby::Resources.pages
  input.gsub %r/\[\[([^\]|\|]+)\|?(.*)\]\]/ do
    name = $1.strip
    display_name = $2.strip
        
    found_page = nil
    comps = page.dir.split('/')
    
    # Walk up the directory tree searching for a match.
    # We do this so that if there are multiple files with the same name we
    # find the most closely related match rather than the first match in the
    # entire tree.
    begin
      search_dir = comps.join('/')
      found_page = pages.find(:name => name, :in_directory => search_dir, :recursive => true)
      found_page = pages.find(:title => name, :in_directory => search_dir, :recursive => true) if found_page.nil?
    end until found_page || comps.delete_at(-1) == nil
    
    if found_page
      display_name = found_page.title if display_name.nil? || display_name.empty?
      renderer.link_to_page(display_name, :path => found_page.path)
    else
      display_name = name if display_name.nil? || display_name.empty?
      %Q(#{display_name})
    end
  end

end