From: Sergei Organov <osv@javad.com>
To: help-gnu-emacs@gnu.org
Subject: Re: Problem advising nreverse.
Date: Tue, 15 Dec 2009 15:02:39 +0300 [thread overview]
Message-ID: <hg7tsv$io$1@ger.gmane.org> (raw)
In-Reply-To: hg7gqf$n9n$1@ger.gmane.org
Kevin Rodgers <kevin.d.rodgers@gmail.com> writes:
> [I'm responding to this message, because subsequently the thread spun out of
> control beyond my comprehension.]
>
> Sergei Organov wrote:
>> pjb@informatimago.com (Pascal J. Bourguignon) writes:
> ...
>>> Redefining nreverse and reloading the ewoc-collect function would help
>>> as indicated...
>>
>> Yeah, but:
>>
>> 1. I don't really want `nreverse' to be always redefined.
>
> If you know the bug is in ewoc, you don't want nreverse redefined ever.
>
>> 2. I don't know how to reload `ewoc-collect' (from elisp) provided it's
>> already byte-compiled.
>
> Put the new defun in a file and explicitly reload it.
Copy-paste the original and fix that? This has its own drawbacks. Think
what will happen when new version of the package with incompatible
function appears.
>> Here what I've actually originally tried (that didn't work):
>>
>> (defadvice ewoc-collect (around fix-ewoc-collect activate)
>> "Fix buggy `ewoc-collect' by reversing its result provided it
>> was altered by `nreverse'."
>> (let ((last-nreverse-result))
>> (unwind-protect
>> (progn
>> (defadvice nreverse (after notice-nreverse activate)
>> (setq last-nreverse-result ad-return-value))
>> ad-do-it)
>
> ad-do-it is not a variable: it is a form that can only be meaningfully
> referenced *within* a defadvice form.
But it *is* within 'fix-ewoc-collect' defadvice form (look at top-level).
>
>> (ad-unadvise 'nreverse))
>> (if (eq last-nreverse-result ad-return-value)
>> (setq ad-return-value (nreverse ad-return-value)))))
>
> I don't understand: How can you determine whether any value "was
> altered by nreverse"? That is not Lispish thinking.
Yeah, probably it is not Lispish. Another option was to make 'nreverse'
a no-op for duration of 'ewoc-collect' call, but that didn't work
either, apparently due to the same reason defadvice of nreverse doesn't
work.
--
Sergei.
next prev parent reply other threads:[~2009-12-15 12:02 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.12764.1260538816.2239.help-gnu-emacs@gnu.org>
2009-12-12 12:18 ` Problem advising nreverse Pascal J. Bourguignon
2009-12-14 11:07 ` Sergei Organov
[not found] ` <mailman.12932.1260788943.2239.help-gnu-emacs@gnu.org>
2009-12-14 13:01 ` Pascal J. Bourguignon
2009-12-14 15:05 ` Sergei Organov
2009-12-15 8:19 ` Kevin Rodgers
2009-12-15 12:02 ` Sergei Organov [this message]
[not found] ` <mailman.12940.1260803316.2239.help-gnu-emacs@gnu.org>
2009-12-14 15:23 ` Pascal J. Bourguignon
2009-12-14 16:01 ` Sergei Organov
[not found] ` <mailman.12941.1260806509.2239.help-gnu-emacs@gnu.org>
2009-12-14 17:56 ` Pascal J. Bourguignon
2009-12-14 19:59 ` Sergei Organov
[not found] ` <mailman.12952.1260820780.2239.help-gnu-emacs@gnu.org>
2009-12-15 1:47 ` Pascal J. Bourguignon
2009-12-15 12:06 ` Sergei Organov
[not found] ` <mailman.13009.1260879016.2239.help-gnu-emacs@gnu.org>
2009-12-15 19:54 ` Pascal J. Bourguignon
2009-12-15 20:38 ` Sergei Organov
[not found] ` <mailman.13027.1260909564.2239.help-gnu-emacs@gnu.org>
2009-12-15 21:12 ` Barry Margolin
2009-12-16 11:27 ` Sergei Organov
[not found] ` <mailman.13051.1260962896.2239.help-gnu-emacs@gnu.org>
2009-12-17 16:52 ` Barry Margolin
2009-12-11 13:22 Sergei Organov
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