Re: Determining existence of text following point

[michael-franzese@gmx.com]

Point will always be at the beginning of a comment on a separate line

The "^" shows the position of the cursor.

                   ^;; ;;;;;;;;;;;;;;;;;;;;;;;;;;

         ^;; +++++++++++++++++++++++++++

^;; ----------------------------

I want to have a keybinding that if I continue to hit will change
a comment from

;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to

;; +++++++++++++++++++++++++++++++++++++

Currently I have the following code


(defun insert-bifurcation (s n)
   "todo"

   (let* ( (a (point))  (b (line-end-position))
	   (line-cut (buffer-substring-no-properties a b)) )

      (when (or (not (string-match
		        "[^[:blank:]]" line-cut)) (eolp))
         (pcase n

	    (0
  	        (save-excursion (insert s))
	        (comment-region a b))
	    
    	    ((or 1 2 3 4 5)
	        (delete-region a b)
	        (save-excursion (insert s))
		(comment-region a b))

            (_
	        (delete-region a b))) )) )

(defvar count 1)

(defun insert-bifurcating-comment ()
  "Insert bifurcating line at cursor position"
  (interactive)

  (let* ( (m 62) (n 69)
	  (lena (- m (current-column)))   ; lena = m - (current-column)
	  (lenb (- n (current-column))) )

    (pcase count
      (0
         ;; makes s to be line with repeating ";"
         (setq-local s (make-string lena ?\;))  ; repeats lena times
	 (insert-bifurcation s count)
         (setq-local count 1))
      (1
         ;; makes s to be line with repeating ";"
         (setq-local s (make-string lenb ?\;))  ; string length lenb
	 (insert-bifurcation s count)
	 (setq-local count 2))
      (2
         ;; makes s to be line with repeating "+"
         (setq-local s (make-string lena ?+))
	 (insert-bifurcation s count)
         (setq-local count 3))
      (_
         ;; deactivates the bifurcating line
         (insert-bifurcation s count)
         (setq-local count 1)) )) )






> Sent: Wednesday, May 19, 2021 at 10:17 AM
> From: "Jean Louis" <bugs@gnu.support>
> To: michael-franzese@gmx.com
> Cc: "Eric Abrahamsen" <eric@ericabrahamsen.net>, "Skip Montanaro" <skip.montanaro@gmail.com>, "Help Gnu Emacs" <help-gnu-emacs@gnu.org>
> Subject: Re: Determining existence of text following point
>
> * michael-franzese@gmx.com <michael-franzese@gmx.com> [2021-05-18 23:52]:
> > For instance, if the text in a commented string as follows, I will go ahead with
> > the insertion.
> > 
> (defun my-insert-on-empty-end-of-line (s)
>   (let ((line-cut (buffer-substring-no-properties (point) (line-end-position))))
>     (when (or (not (string-match "[^[:blank:]]" line-cut)) (eolp))
>       (insert s))))
> 
> (defun my-insert-on-empty-end-of-line (s)
>   (let ((line-cut (buffer-substring-no-properties (point) (line-end-position))))
>     (when (or (not (string-match "[^+[:blank:];-]" line-cut)) (eolp))
>       (insert s))))
> 
> (defun my-insert ()
>   (interactive)
>   (my-insert-on-empty-end-of-line "Hello"))
> 
> (local-set-key (kbd "<f5>") 'my-insert)
> 
> Line with blanks, works:
> ;;          Hello                              
> 
> Line with something else but our series of chars (does not work, expected):
> 
> ;;       █               abc
> 
> Line with fancy stuff that we wish to include (works):
> 
> ;; ;;;;;;;;;;;;;;;;Hello;;;;;;;;;;;;;;;;;;;;;;
> ;; +++++++++++++++++++++Hello+++++++++++++
> ;; -------------------------Hello------Hello
> 
> Weird other lines (it does not work, as it is so expected):
> 
> ;; 𝓒𝓾𝓻𝓼𝓸𝓻 𝓲𝓼 𝓱𝓮𝓻𝓮: █  𝓫𝓾𝓽 𝓲𝓼 𝓷𝓸𝓽 𝔀𝓸𝓻𝓴𝓲𝓷𝓰, 𝐄𝐗𝐏𝐄𝐂𝐓𝐄𝐃!
> 
> 
> -- 
> Jean
> 
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