Re: master f866c85ac4e: (jsonrpc--log-event): Try and fix bug#68072

[Po Lu <luangruo@yahoo.com>]

Stefan Monnier via Mailing list for Emacs changes <emacs-diffs@gnu.org>
writes:

> branch: master
> commit f866c85ac4e32df8061b285b6b44b15346994f3d
> Author: Stefan Monnier <monnier@iro.umontreal.ca>
> Commit: Stefan Monnier <monnier@iro.umontreal.ca>
>
>     (jsonrpc--log-event): Try and fix bug#68072
>     
>     * lisp/jsonrpc.el (jsonrpc--log-event): Force the use of
>     `lisp-indent-function` in `pp-to-string`.
> ---
>  lisp/jsonrpc.el | 21 +++++++++++----------
>  1 file changed, 11 insertions(+), 10 deletions(-)
>
> diff --git a/lisp/jsonrpc.el b/lisp/jsonrpc.el
> index 3f33443f321..f0f5842a0ee 100644
> --- a/lisp/jsonrpc.el
> +++ b/lisp/jsonrpc.el
> @@ -1003,16 +1003,17 @@ of the API instead.")
>                                             (or method "")
>                                             (if id (format "[%s]" id) "")))))
>                 (msg
> -                (cond ((eq format 'full)
> -                       (format "%s%s\n" preamble (or json log-text)))
> -                      ((eq format 'short)
> -                       (format "%s%s\n" preamble (or log-text "")))
> -                      (t
> -                       (format "%s%s" preamble
> -                               (or (and foreign-message
> -                                        (concat "\n" (pp-to-string
> -                                                      foreign-message)))
> -                                   (concat log-text "\n")))))))
> +                (pcase format
> +                  ('full  (format "%s%s\n" preamble (or json log-text)))
> +                  ('short (format "%s%s\n" preamble (or log-text "")))
> +                  (_
> +                   (format "%s%s" preamble
> +                           (or (and foreign-message
> +                                    (let ((lisp-indent-function ;bug#68072
> +                                           #'lisp-indent-function))
> +                                      (concat "\n" (pp-to-string
> +                                                    foreign-message))))
> +                               (concat log-text "\n")))))))
>            (goto-char (point-max))
>            ;; XXX: could use `run-at-time' to delay server logs
>            ;; slightly to play nice with verbose servers' stderr.

Is there any substantive reason it was necessary to replace cond with
pcase?  If not, why was cond replaced with pcase?

Thanks.