Re: LaTeX commands and packages names autocomplete.

[Hongyi Zhao]

On Fri, May 5, 2023 at 2:18 AM Arash Esbati <arash@gnu.org> wrote:
>
> Hongyi Zhao <hongyi.zhao@gmail.com> writes:
>
> > I should have also uncommented the above line. But even so, I have the
> > following problems:
> >
> > 1. I must at least type 3 letters to trigger the completion.
>
> ,----[ C-h v corfu-auto-prefix RET ]
> | corfu-auto-prefix is a variable defined in ‘corfu.el’.
> |
> | Its value is 3
> |
> | Minimum length of prefix for auto completion.
> | The completion backend can override this with
> | :company-prefix-length.  It is *not recommended* to use a small
> | prefix length (below 2), since this will create high load for
> | Emacs.  See also ‘corfu-auto-delay’.
> |
> |   You can customize this variable.
> |
> `----
>
> > 2. Furthermore, my completion candidates list entries are less than
> > yours, as shown in the attached screenshot.
>
> If you take a closer look, you'll see that the screenshot I sent had
> also a candidate "because" since I hit TAB after only 2 characters, you
> have 3 characters "bec" in the buffer where the completion kicks in,
> hence one candidate is missing.

You're right. Set `(corfu-auto-prefix 2)` does the trick, as shown in
the attached screenshot.

> In your other mail, you wrote:
>
> > Another problem I noticed:
> >
> > 3. The speed of triggering the candidate list for the first time is
> > very slow, while company-mode does not seem to have this problem.
>
> I don't use use-package, but you'll know that it loads packages lazily,
> so if you're using corfu in your .tex file for the first in a fresh
> Emacs instance, it has to be loaded; maybe that's the reason.  I observe
> the same thing if I deactivate corfu in a .tex buffer and activate
> company; it takes a sec before it's ready to go.

Now, I add the `:demand t` to the corfu's use-package configuration,
but the problem still remains:

(use-package corfu
  :demand t
  ;; Optional customizations
  :custom
  ;; (corfu-cycle t)                ;; Enable cycling for `corfu-next/previous'
  (corfu-auto t)                 ;; Enable auto completion
  (corfu-auto-prefix 2)
  ;; (corfu-separator ?\s)          ;; Orderless field separator
  ;; (corfu-quit-at-boundary nil)   ;; Never quit at completion boundary
  ;; (corfu-quit-no-match nil)      ;; Never quit, even if there is no match
  ;; (corfu-preview-current nil)    ;; Disable current candidate preview
  ;; (corfu-preselect 'prompt)      ;; Preselect the prompt
  ;; (corfu-on-exact-match nil)     ;; Configure handling of exact matches
  ;; (corfu-scroll-margin 5)        ;; Use scroll margin

  ;; Enable Corfu only for certain modes.
  ;; :hook ((prog-mode . corfu-mode)
  ;;        (shell-mode . corfu-mode)
  ;;        (eshell-mode . corfu-mode))

  ;; Recommended: Enable Corfu globally.
  ;; This is recommended since Dabbrev can be used globally (M-/).
  ;; See also `corfu-exclude-modes'.
  :init
  (global-corfu-mode))

;; A few more useful configurations...
(use-package emacs
  :init
  ;; TAB cycle if there are only few candidates
  ;; (setq completion-cycle-threshold 3)

  ;; Emacs 28: Hide commands in M-x which do not apply to the current mode.
  ;; Corfu commands are hidden, since they are not supposed to be used via M-x.
  ;; (setq read-extended-command-predicate
  ;;       #'command-completion-default-include-p)

  ;; Enable indentation+completion using the TAB key.
  ;; `completion-at-point' is often bound to M-TAB.
  (setq tab-always-indent 'complete))

> Best, Arash

Regards, Zhao

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