ruby.rb

# Determine Ruby style guide violations per-line.
module StyleGuide
  class Ruby < Base
    DEFAULT_CONFIG_FILENAME = "ruby.yml"

    def violations_in_file(file)
      if config.file_to_exclude?(file.filename)
        []
      else
        team.inspect_file(parsed_source(file)).map do |violation|
          line = file.line_at(violation.line)

          Violation.new(
            filename: file.filename,
            patch_position: line.patch_position,
            line: line,
            line_number: violation.line,
            messages: [violation.message]
          )
        end
      end
    end

    private

    def team
      RuboCop::Cop::Team.new(RuboCop::Cop::Cop.all, config, rubocop_options)
    end

    def parsed_source(file)
      RuboCop::ProcessedSource.new(file.content)
    end

    def config
      @config ||= RuboCop::Config.new(merged_config, "")
    end

    def merged_config
      RuboCop::ConfigLoader.merge(default_config, custom_config)
    rescue TypeError
      default_config
    end

    def default_config
      RuboCop::ConfigLoader.configuration_from_file(default_config_file)
    end

    def custom_config
      RuboCop::Config.new(repo_config.for(name), "").tap do |config|
        config.add_missing_namespaces
        config.make_excludes_absolute
      end
    rescue NoMethodError
      RuboCop::Config.new
    end

    def rubocop_options
      if config["ShowCopNames"]
        { debug: true }
      end
    end

    def default_config_file
      DefaultConfigFile.new(DEFAULT_CONFIG_FILENAME, repository_owner).path
    end
  end
end