zooppa/administrate-field-simple_markdown

# frozen_string_literal: true

require 'rails'
require 'administrate/field/text'
require 'administrate/engine'
require 'redcarpet'
require 'redcarpet/render_strip'

module Administrate
  module Field
    class SimpleMarkdown < Administrate::Field::Text
      class Engine < ::Rails::Engine
        Administrate::Engine.add_javascript 'administrate-field-simple_markdown/application'
        Administrate::Engine.add_stylesheet 'administrate-field-simple_markdown/application'
      end

      def data
        @data || ''
      end

      def easymde_options
        options.fetch(:easymde_options, {})
               .transform_keys { |key| key.to_s.camelize(:lower) }
               .to_json
      end

      def to_html
        markdown(html_renderer).render(data).html_safe
      end

      def to_s
        markdown(plaintext_renderer).render(data)
      end

      def html_id
        [
          resource.class.name.underscore.gsub('/', '_'),
          attribute
        ].join('_')
      end

      private

      def html_renderer
        @html_renderer ||= Redcarpet::Render::HTML.new({
                                                         safe_links_only: options.fetch(:safe_links_only, true),
                                                         filter_html: options.fetch(:filter_html, true),
                                                         with_toc_data: options.fetch(:with_toc_data, true),
                                                         hard_wrap: options.fetch(:hard_wrap, true),
                                                         link_attributes: options.fetch(:link_attributes,
                                                                                        { rel: 'nofollow' })
                                                       })
      end

      def plaintext_renderer
        @plaintext_renderer ||= Redcarpet::Render::StripDown
      end

      def markdown(renderer)
        @markdown ||= Redcarpet::Markdown.new(renderer, {
                                                autolink: options.fetch(:autolink, true),
                                                tables: options.fetch(:tables, true),
                                                no_intra_emphasis: options.fetch(:no_intra_emphasis, true),
                                                strikethrough: options.fetch(:strikethrough, true),
                                                highlight: options.fetch(:highlight, true),
                                                space_after_headers: options.fetch(:space_after_headers, true)
                                              })
      end
    end
  end
end