GNU bug report logs - #25678
25.1; defcustom type `(file :must-match t)' seems not to work

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Package: emacs;

Reported by: Drew Adams <drew.adams <at> oracle.com>

Date: Fri, 10 Feb 2017 18:33:02 UTC

Severity: normal

Tags: fixed

Found in versions 25.1, 26.3

Fixed in version 28.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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From: npostavs <at> users.sourceforge.net
To: Drew Adams <drew.adams <at> oracle.com>
Cc: 25678 <at> debbugs.gnu.org
Subject: bug#25678: 25.1; defcustom type `(file :must-match t)' seems not to work
Date: Fri, 17 Feb 2017 18:57:56 -0500

Drew Adams <drew.adams <at> oracle.com> writes:

> (defcustom foo-file ""
>   ""
>   :type '(file :must-match t) :group 'convenience)
>
> M-x customize-option foo-file
>
> I don't see anything that prevents you from using a file name that
> corresponds to no existing file.  I don't see that completion (`M-TAB') 
> enforces it to name an existing file.  And I don't see that simply 
> inserting a bad file name is prevented, nor is setting the option to a
> bad file name or saving it prevented.
>
> What effect does (file :must-match t) actually have, if any?

It looks like `widget-file-prompt-value' consults it, but I can't tell
when this function is called.
This bug report was last modified 4 years and 257 days ago.

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