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Re: Recognizing obsolete external package versions

From: Kim F. Storm
Subject: Re: Recognizing obsolete external package versions
Date: Mon, 13 Aug 2007 11:56:53 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux)

Richard Stallman <address@hidden> writes:

> That code seems basically right
> except that I would rather it avoid calling eval.
> It should give the name of a variable, and the values that are bad.
IIRC, we discurage inclusion of version strings in packages.

And even if there is a version string, there is no guarangee that the
version string is stored in a variable.

> I think it would be better to check at the beginning of loading the file
> rather than at the end.  That is possible by searching for "(defvar VARIABLE",
> evaluating the sexp that comes next, and looking at its value.

For the CUA-mode check, there is no such version variable ... instead, it
is simply the presence of the `CUA-mode' feature which triggers the warning.

I could also imagine that for some packages, checking for an old
version need to e.g. check for the (non-)presense of some function or

> That would require detecting the file by its name rather than by
> a feature it provides.

What method would you use to trigger the checking _before_ the load
(even before reading the file)?

AFAICS, we only have eval-after-load to play with here.

Kim F. Storm <address@hidden> http://www.cua.dk

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