related.rb

# Copyright (c) 2014-2017 Yegor Bugayenko
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the 'Software'), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so. The Software doesn't include files with .md extension.
# That files you are not allowed to copy, distribute, modify, publish, or sell.
#
# THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

module Yegor
  class RelatedBlock < Liquid::Tag
    def render(context)
      page = context.registers[:page]
      site = context.registers[:site]
      page['related'].map do |p|
        html(site, p)
      end.join('')
    end
    def html(site, name)
      file = "_posts/#{name}.md"
      page = site.posts.docs.detect do |p|
        p.relative_path == file
      end
      "<p><a href='#{page.url}'><strong>" +
        CGI::escapeHTML(page['title']) +
        '</strong></a> <br/>' +
        CGI::escapeHTML(page['description']) +
        '</p>'
    end
  end
end

Liquid::Template.register_tag('related_posts', Yegor::RelatedBlock)