bug#25230: Patch to ispell.el to simplify use of [:alpha:] for CASECHARS in built-in dictionaries

[Reuben Thomas]

On 20 December 2016 at 15:37, Eli Zaretskii <eliz@gnu.org> wrote:

> From: Reuben Thomas <rrt@sc3d.org>
> Date: Mon, 19 Dec 2016 21:17:17 +0000
> Cc: 25230@debbugs.gnu.org
>
>     You are assuming that [[:alpha:]] and [A-Za-z] are identical.
>
> ​No, because my patch does not change the current behaviour of the code. The assumption that [:alpha:] is OK to use here instead of A-Za-z is already in the code.​

Can you point out where in the code you see that assumption?

The current code in about line 1300 (ispell-set-spellchecker-params) unconditionally overrides all the built-in dictionaries' values for casechars and not-casechars with [:alpha:] in the loop that starts

(dolist (adict ispell-dictionary-alist) …)

At this point, ispell-dictionary-alist already contains ispell-dictionary-base-alist (see a few lines above). Therefore, the original values in the intializer are never used. (Hence my original patch.)

​​

> ​From the conversation on other bugs, I think that the correct thing to do here is to remove the first part of my patch (so that the hardwired dictionaries keep their individual casechars and not-casechars settings), and keep the second part of the patch (so that ispell-set-spellchecker-params does not change them all to [:alpha:].
>
> Does that sound plausible?

I think so, but we should make sure the hard-wired values work with
Aspell, before we make that change.  If they don't, we should provide
something that works for Aspell.

​I thought the hard-wired values were only for ispell dictionaries (for aspell, the dictionaries are searched for on the computer)…

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