Re: Try to understand the ora-company-number function again.

[Hongyi Zhao]

On Thu, Oct 21, 2021 at 3:11 PM Hongyi Zhao <hongyi.zhao@gmail.com> wrote:
>
> On Thu, Oct 21, 2021 at 2:54 PM Hongyi Zhao <hongyi.zhao@gmail.com> wrote:
> >
> > I try to understand the  ora-company-number function [1] again:
> >
> > (defun ora-company-number ()
> > "Forward to `company-complete-number'.
> >
> > Unless the number is potentially part of the candidate.
> > In that case, insert the number."
> > (interactive)
> > (let* ((k (this-command-keys))
> > (re (concat "^" company-prefix k)))
> > (if (or (cl-find-if (lambda (s) (string-match re s))
> > company-candidates)
> > (> (string-to-number k)
> > (length company-candidates))
> > (looking-back "[0-9]+\\.[0-9]*" (line-beginning-position)))
> > (self-insert-command 1)
> > (company-complete-number
> > (if (equal k "0")
> > 10
> > (string-to-number k))))))
> >
> > I've figured out all the intention of the above code snippet except
> > the following line:
> >
> > (looking-back "[0-9]+\\.[0-9]*" (line-beginning-position)
> >
> > I can't understand why the regexp used here must be written in this
> > form. Any hints will be appreciated.
>
> Based on my tries, the following code snippet is enough:
>
>   (defun ora-company-number ()
>     "Forward to `company-complete-number'.
>      Unless the number is potentially part of the candidate.
>      In that case, insert the number."
>     (interactive)
>     (let* ((k (this-command-keys))
>            (re (concat "^" company-prefix k)))
>       (if (cl-find-if (lambda (s) (string-match re s))
>                       company-candidates)
>
>       (self-insert-command 1)
>         (company-complete-number
>          (if (equal k "0") 10
>            (string-to-number k)))
>     )))
>
>
> > [1] 
> > https://github.com/abo-abo/oremacs/blob/0c5f3284acedc966948cbb930e779af5189fd54e/modes/ora-company.el#L22

I came up with the following solution that seems to work:

```emacs-lisp
(use-package comany
  :config
  (setq company-tooltip-limit 16
      company-quick-access-keys '("1" "2" "3" "4" "5" "6" "7" "8" "9"
"0" "q" "w" "e" "r" "t" "y"))

  (defun hz-company-number ()
    "Convert the company-quick-access-keys to the candidates' row
NUMBER visible on the tooltip,
     and then feed it to `company-complete-number' to quickly select
and insert company candidates.
     If the currently entered character is belongs to
company-quick-access-keys and a part of the candidate simultaneously,
     append it to the currently entered string to construct new company-prefix."
    (interactive)
    (let* ((k (this-command-keys))
           (re (concat "^" company-prefix k)))
      (if (cl-find-if (lambda (s) (string-match re s))
                      company-candidates)

      (self-insert-command 1)
        (company-complete-number
     (cond
      ((equal k "1") 1)
      ((equal k "2") 2)
      ((equal k "3") 3)
      ((equal k "4") 4)
      ((equal k "5") 5)
      ((equal k "6") 6)
      ((equal k "7") 7)
      ((equal k "8") 8)
      ((equal k "9") 9)
      ((equal k "0") 10)
      ((equal k "q") 11)
      ((equal k "w") 12)
      ((equal k "e") 13)
      ((equal k "r") 14)
      ((equal k "t") 15)
      ((equal k "y") 16))
     ))))

  (let ((map company-active-map))
    (mapc (lambda (x) (define-key map (format "%s" x) 'hz-company-number))
      '(0 1 2 3 4 5 6 7 8 9 q w e r t y))))
```

Please refer to the following related discussions for some more
related information:

[1] https://github.com/abo-abo/oremacs/issues/38#issuecomment-948472184
[2] https://lists.gnu.org/archive/html/help-gnu-emacs/2021-09/msg00527.html

Any enhancements/suggestions are welcome.

HZ