From: Vincent Lefevre <vincent@vinc17.org>
To: zsh-users@sunsite.dk
Subject: Re: coloring STDERR to terminal
Date: Wed, 30 Jun 2004 09:09:02 +0200 [thread overview]
Message-ID: <20040630070902.GO2033@ay.vinc17.org> (raw)
In-Reply-To: <Pine.LNX.4.60.0406291002300.31134@toltec.zanshin.com>
On 2004-06-29 10:14:13 -0700, Bart Schaefer wrote:
> If you want something fancier, have the coproc print a single byte to its
> stdout every time around the read loop, and put something like
>
> while read -t -p -k 1; do :; done
>
> in the precmd() function to force the main shell to synchronize with the
> coproc before it prints the prompt.
Thanks.
> However, if you produce more lines of output between commands than
> there are bytes of space in the socket buffer you'll block the
> coproc and potentially deadlock everything (which is the trouble
> with filtering the output of programs that don't expect to have
> their output filtered, but that wasn't the question).
I don't understand how this can happen. Otherwise this would mean that
bytes from stderr could be discarded, which would also be very bad.
Also, in the coprocess (while read line; ...), the colored data will
be output only after a \n. However, one generally wants stderr to be
output immediately (contrary to stdout), i.e. unbuffered instead of
line buffered. I assume that -k 1 would fix that, but it would be
inefficient. One could probably use "read -t -k 1" in a loop until
it fails or return a \n. Wouldn't it be fine to have a read option
(e.g. -T) that does this, i.e. read what is requested (i.e. until \n
or num characters if -k is used) or return as soon as nothing else
is available?
--
Vincent Lefèvre <vincent@vinc17.org> - Web: <http://www.vinc17.org/>
100% validated (X)HTML - Acorn / RISC OS / ARM, free software, YP17,
Championnat International des Jeux Mathématiques et Logiques, etc.
Work: CR INRIA - computer arithmetic / SPACES project at LORIA
next prev parent reply other threads:[~2004-06-30 7:10 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-27 23:22 Atom 'Smasher'
2004-06-28 0:06 ` ari
2004-06-28 0:36 ` Atom 'Smasher'
2004-06-29 15:43 ` Bart Schaefer
2004-06-29 16:08 ` Vincent Lefevre
2004-06-29 17:14 ` Bart Schaefer
2004-06-30 7:09 ` Vincent Lefevre [this message]
2004-06-30 10:52 ` Bart Schaefer
2004-06-30 11:43 ` Vincent Lefevre
2004-06-30 12:01 ` Vincent Lefevre
2004-06-30 16:56 ` Bart Schaefer
2004-07-01 18:14 ` Vincent Lefevre
2004-07-02 0:11 ` Bart Schaefer
2004-07-02 12:42 ` Vincent Lefevre
2004-07-02 21:32 ` Bart Schaefer
2004-07-20 9:10 ` Atom 'Smasher'
2004-07-20 16:10 ` Bart Schaefer
2004-07-20 19:27 ` Atom 'Smasher'
2004-07-20 21:15 ` Bart Schaefer
2004-07-20 23:30 ` Wayne Davison
2004-07-21 3:15 ` Bart Schaefer
2004-07-21 6:23 ` Wayne Davison
2004-07-21 7:30 ` Bart Schaefer
2004-07-21 13:19 ` Vincent Lefevre
2004-07-30 11:50 ` Andy Spiegl
2004-07-30 23:44 ` Vincent Lefevre
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