easy-going-rails/lib/semantic/basic_formatter.rb

module Semantic
  # My Custom colorized formatter
  class BasicFormatter < SemanticLogger::Formatters::Color
    ANSI_REVERSED_WARNING = "\e[0;30;43m".freeze
    ANSI_REVERSED_ERROR = "\e[1;30;41m".freeze
    ANSI_GRAY = "\e[90m".freeze

    def initialize
      super(time_format: '%H:%M:%S',
            color_map: ColorMap.new(
              debug: ANSI_GRAY,
              info: SemanticLogger::AnsiColors::GREEN,
              warn: SemanticLogger::AnsiColors::YELLOW
            ))
      @time_format = nil if File.exist?(File.join(Rails.root, 'Procfile.dev'))
    end

    def time
      "#{color}#{format_time(log.time)}#{color_map.clear}" if time_format
    end

    def message
      return unless log.message

      prefix = "#{color}--#{color_map.clear}"

      case log.level
      when :info
        message = log.message
        message = message&.rstrip if log.name == 'Rails' && message.starts_with?('Completed')
        if log.name == 'Rails' && message.starts_with?('Started')
          message = message.split('for')[0]
          puts '' if Rails.env.development?
        end
        if log.name == 'Rails' || log.name == 'ActionView::Base'
          "#{prefix} #{ANSI_GRAY}#{message}#{color_map.clear}"
        else
          "#{prefix} #{SemanticLogger::AnsiColors::WHITE}#{message}#{color_map.clear}"
        end
      when :warn
        "#{prefix} #{ANSI_REVERSED_WARNING}#{log.message}#{color_map.clear}"
      when :error, :fatal
        "#{prefix} #{ANSI_REVERSED_ERROR}#{log.message}#{color_map.clear}"
      else
        "#{prefix} #{color}#{log.message}#{color_map.clear}"
      end
    end

    def tags; end

    def process_info
      fname = file_name_and_line
      "#{color}[#{fname}]#{color_map.clear}" if fname
    end

    def exception
      return unless log.exception

      root_path = Rails.root.to_s
      backtrace = log.exception.backtrace.select do |line|
        line.starts_with?(root_path)
      end

      if backtrace.count.positive?
        "-- #{ANSI_REVERSED_ERROR}#{log.exception.class}#{color_map.clear} #{color}#{log.exception.message}#{color_map.clear}#{SemanticLogger::AnsiColors::WHITE}\n\t#{backtrace.join("\n\t")}#{color_map.clear}\n\n"
      else
        "-- #{ANSI_REVERSED_ERROR}#{log.exception.class}: #{log.exception.message}#{color_map.clear}\n\n"
      end
    end

    def call(log, logger)
      self.color = color_map[log.level]
      self.log = log
      self.logger = logger

      if @time_format
        [time, level, process_info, tags, named_tags, duration, name, message, payload,
         exception].compact.join(' ')
      else
        [tags, named_tags, duration, name, message, payload, exception].compact.join(' ')
      end
    end
  end
end