logger.rb

require 'date'

module Blackboxx
  class Logger
    # TODO false value supresses logging
    def initialize(output, options = {})
      @output = output
      @echo_to_stdout = options.fetch(:echo_to_stdout) { output != STDOUT }
    end

    def info(msg)
      puts_to_output(msg, :info)
    end

    alias_method :puts, :info

    def debug(msg)
      STDOUT.puts(msg) if echo_to_stdout?
      puts_to_output(msg, :debug)
    end

    def echo_to_stdout?; @echo_to_stdout end

    protected

    def puts_to_output(msg, level)
      # Send unformatted output to STDOUT.
      STDOUT.puts(msg) if echo_to_stdout?

      msg = format(msg, level)
      @output.puts(msg)
    end

    # Example format:
    # INFO	2013-12-23 13:10:39	Importing mcwilliams/import/DigitalTastingNotes_20131223.csv
    # DEBUG	2013-12-23 13:10:49	Importing mcwilliams/import/DigitalAwards_20131223.csv
    def format(msg, level)
      level = String(level).upcase
      timestamp = Time.now.strftime('%Y-%m-%d %H:%M:%S')

      "#{level}	#{timestamp}	#{msg}"
    end

  end
end