GNU bug report logs - #63410
30.0.50; [FR] Optionally allow defcustom to check type for standard value

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From: Ruijie Yu <ruijie <at> netyu.xyz>
To: 63410 <at> debbugs.gnu.org
Cc: Eli Zaretskii <eliz <at> gnu.org>, drew.adams <at> oracle.com
Subject: bug#63410: 30.0.50; [FR] Optionally allow defcustom to check type for standard value
Date: Thu, 11 May 2023 22:08:20 +0800

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Ruijie Yu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org> writes:

> In that case, I had my semi-parallel second proposal: provide a command
> that checks for a group of variables and see if types of all variables
> within the group (or its subgroups) are correct.

Regarding the second proposal: I have quickly hacked together a
functional example of type checking, see the attachment.  If we think
this should be integrated into Emacs, I can make some minor edits and
propose a patch.  In that case, I would probably put the functions
somewhere in cus-edit.el or custom.el.

Note that at the moment it depends on the internal function
`custom--standard-value', which is a one-line function accessing a
property of the symbol.

[cfg-check-defcustom.el (text/plain, attachment)]

[Message part 3 (text/plain, inline)]

Also, note that I added the symbol into the warning text because the
goal of this command is to mass-check an entire group, whereas `setopt'
did not mention the variable symbol name.  Not sure if `setopt' should
show the symbol in trouble, but I understand if we don't want to do
that.

-- 
Best,


RY

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