bug#69712: Package author/maintainer printing fix

[Philip Kaludercic <philipk@posteo.net>]

Juri Linkov <juri@linkov.net> writes:

> There are many packages with non-dot author/maintainer format that fail with
>
> Debugger entered--Lisp error: (wrong-type-argument listp "XXIV")
>   car("XXIV")
>   package--print-email-button("XXIV")
>   describe-package-1(#s(package-desc :name chaos-mode ((:authors ("XXIV")) (:maintainers ("XXIV")) (:maintainer "XXIV"))))
>   describe-package(#s(package-desc :name chaos-mode ((:authors ("XXIV")) (:maintainers ("XXIV")) (:maintainer "XXIV"))))
>   package-menu-describe-package(#<marker (moves after insertion) at 67389 in *Packages*>)
>   button-activate(#<marker (moves after insertion) at 67389 in *Packages*> nil)
>   push-button(67389)
>   funcall-interactively(push-button 67389)
>   command-execute(push-button)
>
> Here is the fix:

Is there any reason not to apply this?  It makes sense to me.

> diff --git a/lisp/emacs-lisp/package.el b/lisp/emacs-lisp/package.el
> index fe7b10f569a..790860df2a7 100644
> --- a/lisp/emacs-lisp/package.el
> +++ b/lisp/emacs-lisp/package.el
> @@ -3082,19 +3082,21 @@ package--print-email-button
>    "Insert a button whose action will send an email to RECIPIENT.
>  NAME should have the form (FULLNAME . EMAIL) where FULLNAME is
>  either a full name or nil, and EMAIL is a valid email address."
> -  (when (car recipient)
> -    (insert (car recipient)))
> -  (when (and (car recipient) (cdr recipient))
> -    (insert " "))
> -  (when (cdr recipient)
> -    (insert "<")
> -    (insert-text-button (cdr recipient)
> -                        'follow-link t
> -                        'action (lambda (_)
> -                                  (compose-mail
> -                                   (format "%s <%s>" (car recipient) (cdr recipient)))))
> -    (insert ">"))
> -  (insert "\n"))
> +  (if (stringp recipient)
> +      (insert recipient "\n")
> +    (when (car recipient)
> +      (insert (car recipient)))
> +    (when (and (car recipient) (cdr recipient))
> +      (insert " "))
> +    (when (cdr recipient)
> +      (insert "<")
> +      (insert-text-button (cdr recipient)
> +                          'follow-link t
> +                          'action (lambda (_)
> +                                    (compose-mail
> +                                     (format "%s <%s>" (car recipient) (cdr recipient)))))
> +      (insert ">"))
> +    (insert "\n")))
>  
>  \f
>  ;;;; Package menu mode.
>

-- 
	Philip Kaludercic on peregrine