From: Brian Candler <b.candler@...>
Date: 2009-12-17T01:24:21+09:00
Subject: Re: Using threads to show progress

Aldric Giacomoni wrote:
>>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
> 
> From inside a loop, can I dynamically know over how many elements the 
> loop will iterate? I noticed the repetition of '33' and '20' ... :)

It depends on what you're iterating over. If it's an Array, use 
Array#size:

   myarray.each_with_index do |elem, i|
     Progress << ["Processing", i, myarray.size]
     ...
   end

Progress does here assume that you know the number of iterations in 
advance (so it can show a progress bar). You could easily modify the 
code so that

    Progress << ["munch", x]

it would just display the number x, rather than a bar.

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