Re: master 5183123: Add Tramp recompilation

["Basil L. Contovounesios" <contovob@tcd.ie>]

Michael.Albinus@gmx.de (Michael Albinus) writes:

> diff --git a/lisp/net/tramp-cmds.el b/lisp/net/tramp-cmds.el
> index d208f0e..6342cf5 100644
> --- a/lisp/net/tramp-cmds.el
> +++ b/lisp/net/tramp-cmds.el
> @@ -472,6 +472,48 @@ For details, see `tramp-rename-files'."
>  (function-put
>   #'tramp-rename-these-files 'completion-predicate #'tramp-command-completion-p)
>  
> +;; This function takes action since Emacs 28.1, when
> +;; `read-extended-command-predicate' is set to
> +;; `command-completion-default-include-p'.
> +;;;###tramp-autoload
> +(defun tramp-recompile-elpa-command-completion-p (_symbol _buffer)
> +  "A predicate for `tramp-recompile-elpa'.
> +It is completed by \"M-x TAB\" only if package.el is loaded, and
> +Tramp is an installed ELPA package."
> +  ;; We cannot apply `package-installed-p', this would also return the
> +  ;; builtin package.
> +  (tramp-compat-funcall 'package--user-installed-p 'tramp))

It looks like package--user-installed-p isn't currently designed to be
used in this way:

0. emacs -Q
1. (progn
     (require 'package)
     (require 'tramp)
     (setq read-extended-command-predicate
           #'command-completion-default-include-p)
     (read-extended-command))
2. C-j C-i

Debugger entered--Lisp error: (wrong-type-argument package-desc nil)
  signal(wrong-type-argument (package-desc nil))
  package--user-installed-p(tramp)
  tramp-recompile-elpa-command-completion-p(tramp-recompile-elpa
                                            #<buffer *scratch*>)
  command-completion-default-include-p(tramp-recompile-elpa
                                       #<buffer *scratch*>)

Should package--user-installed-p simply guard against a nil package
descriptor?

Thanks,

-- 
Basil