Re: Org to Markdown programmatically

[Jean Louis <bugs@gnu.support>]

* Emanuel Berg via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> [2021-05-05 22:48]:
> For example:
> 
> (require 'cl)
> 
> (cl-loop for (x y) in '((1 2) (3 4) (5 6))
>          do (message "%d + %d = %d" x y (+ x y)) )
> 
> 1 + 2 = 3
> 3 + 4 = 7
> 5 + 6 = 11

Sure. If I look in my Common Lisp directory, I have 94 occurences
of `loop' there. Various complex things. But I try not to over
load things.

The `cl' library is now in "obsolete" directory and function
`cl-loop' is not obsolete. So I guess maybe you will not need
`require', it should work, it is now in `cl-macs.el'
file. Package describes it as extensions to Emacs Lisp for
compatibility reasons.

Same with `while':

(let ((list '((1 2) (3 4) (5 6))))
  (while list
    (let* ((pair (pop list))
	   (x (car pair))
	   (y (cadr pair)))
      (message "%d + %d = %d" x y (+ x y)))))

I would like above rather than this one below, as I don't seek CL
compatibility:

(cl-loop for (x y) in '((1 2) (3 4) (5 6))
         do (message "%d + %d = %d" x y (+ x y)))

Or with `mapc':

(mapc (lambda (pair)
	(let ((x (car pair))
	      (y (cadr pair)))
	  (message "%d + %d = %d" x y (+ x y))))
      '((1 2) (3 4) (5 6)))

And then benchmark:

(benchmark 100000000
	   (let ((list '((1 2) (3 4) (5 6))))
	     (while list
	       (let* ((pair (pop list))
		      (x (car pair))
		      (y (cadr pair)))
		 (message "%d + %d = %d" x y (+ x y)))))) ⇒ "Elapsed time: 5.520809s"

(benchmark 100000000
	   (cl-loop for (x y) in '((1 2) (3 4) (5 6))
		    do (message "%d + %d = %d" x y (+ x y)))) ⇒ "Elapsed time: 5.784922s"

(benchmark 100000000
	   (let ()
	     (mapc (lambda (pair)
		     (let ((x (car pair))
			   (y (cadr pair)))
		       (message "%d + %d = %d" x y (+ x y))))
		   '((1 2) (3 4) (5 6)))
	     nil)) ⇒ "Elapsed time: 5.158536s"

I thint that benchmark says nothing much, the tests are vague and
they are about as fast. `while' is probably slowest.

`while' is giving me more clarity.

Yet your example still did not replace this function below, there
are no list of lists inside:

(defun outline-highlight-keywords ()
  (interactive)
  (let ((my-keywords '("TODO" hi-yellow
		       "DONE" hi-green
		       "URGENT" hi-red-b)))
    (while my-keywords
      (let ((keyword (pop my-keywords))
	    (highlight (pop my-keywords)))
	(highlight-regexp keyword highlight)))))

-- 
Jean

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