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

module Semantic
  # My Custom colorized formatter
  class BasicFormatter < AbstractFormatter
    ANSI_REVERSED_WARNING = "\e[0;30;43m".freeze
    ANSI_REVERSED_ERROR = "\e[1;30;41m".freeze
    MAX_LENGTH_LINE = 255
    PRIME = '▍'.freeze
    CONTINATION = '▕'.freeze

    def initialize
      super(color_map: ColorMap.new(
        debug: TEXT_GRAY_400,
        info: TEXT_GREEN,
        warn: TEXT_BROWN,
        error: LIGHT_TEXT_RED,
        fatal: TEXT_MAGENTA
      ))
      @time_format = File.exist?(File.join(Rails.root, 'Procfile.dev')) ? nil : '%H:%M:%S'
    end

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

      wrap_level(MAX_LENGTH_LINE, duration, named_tags, message, payload, exception)
    rescue StandardError => e
      puts "Error during formatting: #{e.message}"
      puts e.backtrace.join("\n")
    end

    private

    def wrap_level(length, *items)
      prime = "#{build_prime} "
      continuation = "#{build_continuation} "
      items
        .map { |item| Semantic::AnsiWrapper.wrap(item, length, prime, continuation) }
        .compact.join("\n")
    end

    def message
      return unless log.message

      log.level == :info ? colorize(log.message, TEXT_WHITE) : colorize(log.message)
    end

    def process_info
      fname = file_name_and_line
      colorize fname if fname
    end

    def time = @time_format ? colorize(format_time(log.time), color) : nil
    def build_prefix(char) = [time, tags, origin, colorize(char)].compact.join ' '
    def build_prime = build_prefix(PRIME)
    def build_continuation = build_prefix(CONTINATION)
  end
end