discourse/lib/onebox/mixins/github_body.rb

# frozen_string_literal: true

module Onebox
  module Mixins
    module GithubBody
      def self.included(klass)
        klass.include(Onebox::Engine)
        klass.include(InstanceMethods)
      end

      module InstanceMethods
        GITHUB_COMMENT_REGEX = /<!--.*?-->/
        MAX_BODY_LENGTH = 80

        def compute_body(body)
          if body
            body = body.gsub(GITHUB_COMMENT_REGEX, '').strip
            if body.length == 0
              body = nil
            elsif body.length > MAX_BODY_LENGTH
              excerpt = body[MAX_BODY_LENGTH..body.length].rstrip
              body = body[0..MAX_BODY_LENGTH - 1]
            end
          end

          [body, excerpt]
        end
      end
    end
  end
end