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Re: Problem advising nreverse.

From: Pascal J. Bourguignon
Subject: Re: Problem advising nreverse.
Date: Mon, 14 Dec 2009 18:56:11 +0100
User-agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/22.3 (darwin)

Sergei Organov <address@hidden> writes:

> You see, I wanted automatic elisp-only solution to "fixing"
> ewoc-collect, but only if it indeed happens to be buggy. Manual
> reloading is not an option then. Alternate approach would be to execute
> simple test-case to determine if ewoc-collect is indeed buggy and then
> re-define it to the correct version if so. That's what I'm going to
> implement now, provided there doesn't seem to be a way to do what I want
> by means of advising ewoc-collect and nreverse.

I see.  

Perhaps you can statically characterize what version (variables
emacs-version, emacs-major-version, emacs-minor-version) contains the
broken ewoc, and then just redefine it in these versions, in your

    (require 'ewoc)
    (when (or (< emacs-version-major NN)
              (and (= emacs-version-major NN)
                   (< emacs-version-minor MM)))
      (defun ewoc-collect (...)

or else, if you can detect the broken version with a test:

    (require 'ewoc)
    (unless (equal 'expected-result
                   (ewoc-collect 'test-arguments))
       (defun ewoc-collect (...)

(you can add a (byte-compile 'ewoc-collect) after the defun in either
case if you need it fast).

__Pascal Bourguignon__

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