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

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Andy Wingo <wingo <at> pobox.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#17657: closed (pretty-print #:width values above 49 don't work?)
Date: Tue, 21 Jun 2016 14:48:01 +0000

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Your message dated Tue, 21 Jun 2016 16:47:20 +0200
with message-id <87lh1yy4xz.fsf <at> pobox.com>
and subject line Re: bug#17657: pretty-print #:width values above 49 don't work?
has caused the debbugs.gnu.org bug report #17657,
regarding pretty-print #:width values above 49 don't work?
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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17657: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=17657
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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

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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

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