plaintext-slides.rb

# frozen_string_literal: true

module Jekyll
  module Generators
    # Convert our slides to plaintext
    # It's not a great convesion, the CSS classes are retained which are ugly
    # But there's no good way to parse those out since they use a wildly nonstandard syntax
    class PlaintextSlidesGenerator < Generator
      SLIDE_LAYOUTS = %w[
        tutorial_slides
        base_slides
        introduction_slides
        tutorial_slides_ai4life
      ].freeze

      ##
      # Generate a plaintext version of the slides
      # Params:
      # +site+:: The +Jekyll::Site+ object
      def generate(site)
        # layout: tutorial_slides
        # layout: base_slides

        site.pages.select { |page| SLIDE_LAYOUTS.include? page.data['layout'] }.each do |page|
          dir = File.dirname(File.join('.', page.url))
          page2 = Jekyll::Page.new(site, site.source, dir, page.name)
          page2.data['layout'] = 'slides-plain'
          page2.basename = if page2.data.key?('lang')
                             "slides-plain_#{page2.data['lang'].upcase}"
                           else
                             'slides-plain'
                           end
          page2.content = page2.content.gsub(/^name:\s*([^ ]+)\s*$/) do
            anchor = ::Regexp.last_match(1)

            "<span id=\"#{anchor.strip}\"><i class=\"fas fa-link\" aria-hidden=\"true\"></i> #{anchor}</span>"
          end
          if page2.data.key?('redirect_from')
            page2.data['redirect_from'].map { |x| x.gsub!(%r{/slides}, '/slides-plain') }
          end

          site.pages << page2
        end
      end
    end
  end
end