Class: Bovem::Logger

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# File 'lib/bovem/logger.rb', line 12

class Logger < ::Logger
  attr_reader :device

  # Creates a new logger.
  #
  # @see http://www.ruby-doc.org/stdlib-1.9.3/libdoc/logger/rdoc/Logger.html
  #
  # @param logdev [String|IO] The log device. This is a filename (String) or IO object (typically STDOUT, STDERR, or an open file).
  # @param shift_age [Fixnum]  Number of old log files to keep, or frequency of rotation (daily, weekly or monthly).
  # @param shift_size [Fixnum] Maximum logfile size (only applies when shift_age is a number).
  def initialize(logdev, shift_age = 0, shift_size = 1048576)
    @device = logdev
    super(logdev, shift_age, shift_size)
  end

  # Creates a new logger.
  #
  # @param file [String|IO] The log device. This is a filename (String) or IO object (typically STDOUT, STDERR, or an open file).
  # @param level [Fixnum] The minimum severity to log. See http://www.ruby-doc.org/stdlib-1.9.3/libdoc/logger/rdoc/Logger.html for valid levels.
  # @param formatter [Proc] The formatter to use for logging.
  # @return [Logger] The new logger.
  def self.create(file = nil, level = Logger::INFO, formatter = nil)
    begin
      rv = new(get_real_file(file || default_file))
      rv.level = level.to_integer
      rv.formatter = formatter || default_formatter
      rv
    rescue
      raise Bovem::Errors::InvalidLogger
    end
  end

  # Translates a file to standard input or standard output in some special cases.
  #
  # @param file [String] The string to translate.
  # @return [String|IO] The translated file name.
  def self.get_real_file(file)
    case file
      when "STDOUT" then $stdout
      when "STDERR" then $stderr
      else file
    end
  end

  # The default file for logging.
  # @return [String|IO] The default file for logging.
  def self.default_file
    @default_file ||= $stdout
  end

  # The default formatter for logging.
  # @return [Proc] The default formatter for logging.
  def self.default_formatter
    @default_formatter ||= ::Proc.new {|severity, datetime, _, msg|
      color = case severity
        when "DEBUG" then :cyan
        when "INFO" then :green
        when "WARN" then :yellow
        when "ERROR" then :red
        when "FATAL" then :magenta
        else :white
      end

      header = Bovem::Console.replace_markers("{mark=bright-#{color}}[%s T+%0.5f] %s:{/mark}" %[datetime.strftime("%Y/%b/%d %H:%M:%S"), [datetime.to_f - start_time.to_f, 0].max, severity.rjust(5)])
      "%s %s\n" % [header, msg]
    }
  end

  # The log time of the first logger. This allows to show a `T+0.1234` information into the log.
  # @return [Time] The log time of the first logger.
  def self.start_time
    @start_time ||= ::Time.now
  end
end