Re: [PATCH v4] org-encode-time compatibility and convenience helper

[Ihor Radchenko <yantar92@gmail.com>]

Max Nikulin <manikulin@gmail.com> writes:

>>> I do not like repeating of `org-encode-time' but do not see another way
>>> till Emacs-29 will become the lowest supported version.
>> 
>> This is fine. AFAIK, other parts of time handling code is full of conds
>> and pcases.
>
> I mean that before my patch there was single `encode-time' outside of 
> `pcase', I replace `list' by `org-encode-time' inside each pattern.

I do not see it is a big deal. At least, readability of the code did not
degrade, IMHO.

>>>> +	    (org-encode-time
>>>> +             (apply #'list
>>>> +                    (or (car time0) 0)
>>>> +                    (+ (if (eq timestamp? 'minute) n 0) (nth 1 time0))
>>>> +                    (+ (if (eq timestamp? 'hour) n 0)   (nth 2 time0))
>>>> +                    (+ (if (eq timestamp? 'day) n 0)    (nth 3 time0))
>>>> +                    (+ (if (eq timestamp? 'month) n 0)  (nth 4 time0))
>>>> +                    (+ (if (eq timestamp? 'year) n 0)   (nth 5 time0))
>>>> +                    (nthcdr 6 time0))))
>>>>         (when (and (memq timestamp? '(hour minute))
>>>>   		 extra
>>>>   		 (string-match "-\\([012][0-9]\\):\\([0-5][0-9]\\)" extra))
>
>  From my point of view
>
>    (cl-mapcar
>     (lambda (value part)
>       (if (and part (eq part timestamp?))
> 	 (+ n value)
>         value))
>     time0 '(second minute hour day month year nil nil nil))
>
> is better than the original code, but...
>
> Nicolas Goaziou to emacs-orgmode. [Patch] to correctly sort the items 
> with emphasis marks in a list. Mon, 19 Apr 2021 18:08:17 +0200.
> https://list.orgmode.org/87r1j6b6ku.fsf@nicolasgoaziou.fr
>  >
>> I stay away from CL as much as possible, otherwise newcomers will have
>> to learn two languages to start contributing, Elisp and CL (cl-loop,
>> ewww). CL is still necessary however, as we cannot use `seq' yet.

I think that Nicolas was mostly referring to things like cl-loop, which
introduce a whole new piece of language concepts into Elisp.

cl-mapcar is merely a convenience function. Just as any other Elisp
function. It behaves without surprises within the general Elisp
programming concepts. I do not see why we should not use it if it
improves the code clarity.

Best,
Ihor