From: Paul Winward <pwinward@...>
Date: 2008-05-11T02:47:19+09:00
Subject: Re: capture output in real time

Another approach I had tried was to use IO.select, as shown in
http://whynotwiki.com/Ruby_/_Process_management ( attributed to Jamis 
Buck).  This too, produced the same delay in output, but is shown below:

Thank you for any help

def read_until(pipe, stop_at, verbose = true)
  lines = []
  line = ""
  while result = IO.select([pipe])  #, nil, nil, 10)
    next if result.empty?

    c = pipe.read(1)
    break if c.nil?

    line << c
    break if line =~ stop_at

    # Start a new line?
    if line[-1] == ?\n
      puts line if verbose
      lines << line
      line = ""
    end
  end
  lines
end



Paul Winward wrote:
> Thanks for the suggestion but I'm still having the problem.
> 
> Paul
> 
> ara.t.howard wrote:
>> On May 9, 2008, at 6:08 PM, Paul Winward wrote:
>>>
>>> Note, I'm avoiding STDOUT.flush in sleep.rb since I won't be able to
>>> change the actual scripts I'll be passing to popen3.
>> 
>> popen3 is going to be using fork/exec under the hood and should
>> inherit the sync setting of STDOUT, so try setting
>> 
>>    STDOUT.sync = true
>> 
>> before the popen and see if that helps - untested, but i'm running out
>> the door....
>> 
>> cheers.
>> 
>> a @ http://codeforpeople.com/

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