talk_page_generator.rb

module SpeakingPagePlugin

  class TalkPageGenerator < Jekyll::Generator

    def generate(site)

      events = site.data['talk']

      events_by_year = events.group_by do |event|
        event['end-date'].strftime('%Y')
      end

      current_year = Date.today.strftime('%Y')

      # Generate the main speaking page if the build occurs when no talks have been done yet
      if !events_by_year.has_key?(current_year)

        previous_year = (current_year.to_i - 1).to_s

        events_by_year.each do |year, events|
          generateTalkPage(site, previous_year, year, events_by_year)
        end

        else

        events_by_year.each do |year, events|
          generateTalkPage(site, current_year, year, events_by_year)
        end

      end
    end

    def generateTalkPage(site, current_year, year, events_by_year)

      if year == current_year
        site.pages << CurrentTalkPage.new(site, current_year, year, events_by_year)
      else
        site.pages << TalkPage.new(site, current_year, year, events_by_year)
      end
    end

  end

  class AbstractTalkPage < Jekyll::Page

    def initialize(site, current_year, year, events_by_year)

      @site = site
      @base = site.source
      @ext = '.html'

      self.read_yaml(Jekyll::PathManager.join(@base, '_layouts'), 'talk.html')

      years = events_by_year.keys.sort.reverse
      link_by_year = years.map do |year|
         { 'year' => year, 'link' => year == current_year ? 'speaking' : "speaking/#{year}" }
      end

      events = events_by_year[year]

      self.data['talks_count'] = events.inject(0) { |count, event| count + event['talks'].size }
      self.data['year'] = year
      self.data['years'] = link_by_year
      self.data['events'] = events

      data.default_proc = proc do |_, key|
        site.frontmatter_defaults.find(relative_path, type, key)
      end

       Jekyll::Hooks.trigger :pages, :post_init, self
    end
  end

  class CurrentTalkPage < AbstractTalkPage

    def initialize(site, current_year, year, events_by_year)

      super
      @dir = 'speaking'
      self.data['title'] = 'Speaking'
    end

  end

  class TalkPage < AbstractTalkPage

    def initialize(site, current_year, year, events_by_year)

      super
      @dir = Jekyll::PathManager.join('speaking', year)
      self.data['title'] = "Speaking in #{year}"
    end
  end
end