From: "Shot (Piotr Szotkowski)" <shot@...>
Date: 2008-11-24T02:30:59+09:00
Subject: Re: Printing right arrow vs. a sane progressbar library

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Rob Biedenharn:

> On Nov 22, 2008, at 8:18 PM, Shot (Piotr Szotkowski) wrote:

>> I want to track the progress of a set of
>> (forkoff=E2=80=99d) processes in a simple way. [=E2=80=A6]

>> print '.' * 25; (0...25).sort_by{rand}.each { |n| print "\r"; print "\c[=
[C" * n; print 'o'; sleep 0.5 }; print "\n"

> status=3D'.'*25; print status; (0...25).sort_by{rand}.each{|n| status[n]=
=3D'o';=20
> print "\r#{status}"; sleep(0.1+rand/10.0)};puts

A very good idea, but unfortunately it doesn=E2=80=99t work in a forkoff=E2=
=80=99d
block; every block gets its own copy of the original status and so
generates a line with 24 dots and one o:

shot@devielle:~$ irb -rubygems
>> require 'forkoff'
=3D> true
>> status=3D'.'*25; print status; (0...25).sort_by{rand}.forkoff{|n| status=
[n]=3D'o'; print "\r#{status}"; sleep(0.1+rand/10.0)};puts
=2E.................o......
=3D> nil

Hence my need for a right arrow, or for printing a =E2=80=98transparent=E2=
=80=99
character that doesn=E2=80=99t overwrite what=E2=80=99s already under the c=
ursor.

> You could, perhaps, add a clear-to-EOL sequence, too.

I=E2=80=99m sorry, but I=E2=80=99m a bit braindead today; where would I wan=
t to use
this? (And, when we=E2=80=99re at it, what=E2=80=99s the escape sentence fo=
r it?)

Thanks a lot for your interest in this thread and your reply!

-- Shot
--=20
A distributed system is one in which I cannot get something done because
a machine I've never heard of is down.                 -- Leslie Lamport

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