Re: etags: M-. looks for an uncompressed Emacs Lisp source file, but make install installs it gzipped

[Luca Saiu <positron@gnu.org>]

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Luca Saiu wrote:
> I'm definitely not into this stuff, but I think I've found the problem.
> 
> Look at tag-find-file-of-tag-noselect in etags.el:
> 
> Files with one of the extensions in tags-compression-info-list are only
> looked at if (featurep 'jka-compr) is true, and it stays true even if
> not currently in auto-compression-mode: doing M-x auto-compression-mode
> at least once causes it to become true, and to stay that way.
> 
> (featurep 'jka-compr) is nil at the beginning (see the beginning of
> jka-cmpr-hook.el), but it becomes t when loading jka-compr.el the first
> time.
> 
> Right?

Tested: I don't know whether there's some other solution considered
cleaner, but replacing the two occurrences of

  (featurep 'jka-compr)

with

  auto-compression-mode

in tag-find-file-of-tag-noselect solves the problem.

Note that if you decide to do this change you should also accordingly
update the documentation string of tags-compression-info-list:

  These extensions will be tried only if jka-compr was activated
  \(i.e. via customize of `auto-compression-mode' or by calling the
  function `auto-compression-mode'

What it says is literally true, but possibly misleading: it does *not*
imply "every time that auto-compression-mode is on, jka-compr is
activated". The counterexample is the situation at the beginning.

Ok, enough. Bye,

- --
Luca Saiu
Author of GNU epsilon: http://www.gnu.org/software/epsilon
http://www-lipn.lipn.univ-paris13.fr/~saiu
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