From: Brian Candler <b.candler@...>
Date: 2009-12-17T00:09:15+09:00
Subject: Re: Using threads to show progress

# A suggestion

class Progress
  def initialize(out = STDERR, interval = 0.5)
    @out = out
    @interval = interval
    @timestamp = nil
    @category = nil
  end

  def bar(category, n, m)
    @out << sprintf("%-20s[%-56s]", category, "*" * (56.0 * n / m))
  end

  # Progress << ["Baking", 53, 100]
  # Progress << "Finished"
  def <<(data)
    return if data.is_a?(Array) && data[0] == @category && @timestamp && 
Time.now < @timestamp
    @timestamp = Time.now + @interval
    if data.is_a?(Array) && data[0] == @category
      @out << "\r"
      bar(*data)
      return
    end
    if @category
      @out << "\r"
      bar(@category, 100, 100)
      @out << "\r\n"
    end
    if data.is_a?(Array)
      @category = data[0]
      bar(*data)
    else
      @category = nil
      @out << data << "\r\n"
    end
  end

  def self.<<(data)
    @progress ||= new
    @progress << data
  end
end

if __FILE__ == $0
  Progress << "Feeding the cat"
  33.times do |x|
    Progress << ["munch", x, 33]
    sleep(0.1)
  end
  Progress << "Put the cat out"
  Progress << "Go to sleep"
  20.times do |x|
    Progress << ["zzzzzzz", x, 20]
    sleep(0.2)
  end
  Progress << "Wakey wakey!"
end

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