discourse/plugins/discourse-local-dates/plugin.rb

# name: discourse-local-dates
# about: Display a date in your local timezone
# version: 0.1
# author: Joffrey Jaffeux
hide_plugin if self.respond_to?(:hide_plugin)

register_asset 'javascripts/discourse-local-dates.js.no-module.es6'
register_asset 'stylesheets/common/discourse-local-dates.scss'
register_asset 'moment.js', :vendored_core_pretty_text
register_asset 'moment-timezone.js', :vendored_core_pretty_text

enabled_site_setting :discourse_local_dates_enabled

after_initialize do
  module ::DiscourseLocalDates
    PLUGIN_NAME ||= 'discourse-local-dates'.freeze
    POST_CUSTOM_FIELD ||= 'local_dates'.freeze
  end

  %w[../lib/discourse_local_dates/engine.rb].each do |path|
    load File.expand_path(path, __FILE__)
  end

  register_post_custom_field_type(DiscourseLocalDates::POST_CUSTOM_FIELD, :json)

  on(:before_post_process_cooked) do |doc, post|
    dates =
      doc.css('span.discourse-local-date').map do |cooked_date|
        date = {}
        cooked_date.attributes.values.each do |attribute|
          data_name = attribute.name&.gsub('data-', '')
          if data_name && %w[date time timezone recurring].include?(data_name)
            unless attribute.value == 'undefined'
              date[data_name] = CGI.escapeHTML(attribute.value || '')
            end
          end
        end
        date
      end

    if dates.present?
      post.custom_fields[DiscourseLocalDates::POST_CUSTOM_FIELD] = dates
      post.save_custom_fields
    elsif !post.custom_fields[DiscourseLocalDates::POST_CUSTOM_FIELD].nil?
      post.custom_fields.delete(DiscourseLocalDates::POST_CUSTOM_FIELD)
      post.save_custom_fields
    end
  end

  add_to_class(:post, :local_dates) do
    custom_fields[DiscourseLocalDates::POST_CUSTOM_FIELD] || []
  end

  on(:reduce_cooked) do |fragment|
    fragment.css('.discourse-local-date').each do |container|
      if container.attributes['data-email-preview']
        preview = container.attributes['data-email-preview'].value
        container.content = preview
      end
    end
  end
end