GNU bug report logs - #74409
30.0.92; customize buffer for bibtex-biblatex-entry-alist also shows unformatted variable value

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From: Mauro Aranda <maurooaranda <at> gmail.com>
To: Roland Winkler <winkler <at> gnu.org>
Cc: 74409 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: bug#74409: 30.0.92; customize buffer for bibtex-biblatex-entry-alist also shows unformatted variable value
Date: Fri, 10 Jan 2025 12:34:03 -0300

Roland Winkler <winkler <at> gnu.org> writes:

> On Fri, Jan 10 2025, Mauro Aranda wrote:
>> I tend to think that we should fix these problems by giving appropriate
>> tags to the widgets used for user options, and leaving the cus-edit.el
>> code as it is.
>
> I never understood in full glory how these widgets work with defcustom.
> What would be a minimal example what the missing tag could look like for
> bibtex-biblatex-entry-alist?  (Is this documented in the elisp manual?)
>
> Thanks.

Since the variable says it's an alist, I'd say:

(define-widget 'bibtex-entry-alist 'lazy
  "Format of `bibtex-BibTeX-entry-alist' and friends."
  :tag "Alist"
  :type '(repeat
          (choice (group :tag "Alias"
                         (string :tag "Entry type")
                         (string :tag "Documentation")
                         (string :tag "Alias"))
                  (group :tag "Entry"
                         (string :tag "Entry type")
                         (string :tag "Documentation")
                         (repeat :tag "Required fields" bibtex-field-list)
                         (repeat :tag "Crossref fields" bibtex-field-list)
                         (repeat :tag "Optional fields" 
bibtex-field-list)))))

And maybe it looks better if you do:
(define-widget 'bibtex-entry-alist 'lazy
  "Format of `bibtex-BibTeX-entry-alist' and friends."
  :tag "Alist"
  :type '(repeat
          :format "\n%v" ;; I think this looks better.
          (choice (group :tag "Alias"
                         (string :tag "Entry type")
                         (string :tag "Documentation")
                         (string :tag "Alias"))
                  (group :tag "Entry"
                         (string :tag "Entry type")
                         (string :tag "Documentation")
                         (repeat :tag "Required fields" bibtex-field-list)
                         (repeat :tag "Crossref fields" bibtex-field-list)
                         (repeat :tag "Optional fields" 
bibtex-field-list)))))

Both :format and :tag keywords are documented under:
15.4.4 Type Keywords

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