GNU bug report logs - #17657
pretty-print #:width values above 49 don't work?

Previous Next

Full log

View this message in rfc822 format

From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Mark Polesky <markpolesky <at> yahoo.com>
Subject: bug#17657: closed (Re: bug#17657: pretty-print #:width values
 above 49 don't work?)
Date: Tue, 21 Jun 2016 14:48:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#17657: pretty-print #:width values above 49 don't work?

which was filed against the guile package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 17657 <at> debbugs.gnu.org.

-- 
17657: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=17657
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Andy Wingo <wingo <at> pobox.com>
To: Mark H Weaver <mhw <at> netris.org>
Cc: Mark Polesky <markpolesky <at> yahoo.com>, 17657-done <at> debbugs.gnu.org
Subject: Re: bug#17657: pretty-print #:width values above 49 don't work?
Date: Tue, 21 Jun 2016 16:47:20 +0200

Hi :)

On Sun 01 Jun 2014 20:40, Mark H Weaver <mhw <at> netris.org> writes:

> Mark Polesky <markpolesky <at> yahoo.com> writes:
>> Neither example below should be line-wrapped, but the second one 
>> is.
>
> Our pretty printer, inherited from SLIB and originally written by Marc
> Feeley, uses a great many heuristics to make formatting decisions.
> These heuristics are undocumented and subject to change.
>
> One of its heuristics is that individual expressions shall not be more
> than 49 columns wide.  Notice that pretty-print.scm includes the
> following internal definition:
>
>   (define max-expr-width 50)
>
> (although in fact the maximum width ends up being 49)
>
>> Is there a workaround?
>
> A couple of years ago I added an undocumented #:max-expr-width keyword
> argument to pretty-print, in order to improve the formatting of
> psyntax-pp.scm.  You could use that.

Just pushed some documentation, so this bug is done.

> It would be good to redesign and rewrite our pretty-printer from scratch
> at some point.

Yes!

Andy

[Message part 3 (message/rfc822, inline)]

From: Mark Polesky <markpolesky <at> yahoo.com>
To: bug-guile <at> gnu.org
Subject: pretty-print #:width values above 49 don't work?
Date: Sat, 31 May 2014 11:24:12 -0700 (PDT)

Hi,

Neither example below should be line-wrapped, but the second one 
is.  It looks like pretty-print #:width values above 49 don't
work.  Is there a workaround?


(pretty-print
  '(234 . "901234567890123456789012345678901234567")
  #:width 49) 
=>
(234 . "901234567890123456789012345678901234567")

(pretty-print
  '(234 . "9012345678901234567890123456789012345678")
  #:width 50) 
=>
(234
 .
 "9012345678901234567890123456789012345678")


$ ./config.guess
x86_64-unknown-linux-gnu

$ guile --version
Guile 1.8.8


Thanks!
- Mark

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.