Can we use 'company-doc-buffer if 'company-docsig is not available in corfu-echo-mode?

[cxa]

I don't like corfu-popupinfo-mode, so can we do it as the title describes?

Currently I hack with:

(cl-defmethod corfu--exhibit :after (&context (corfu-echo-mode (eql t)) &optional _auto)
  (if-let* (((not (minibufferp)))
            (delay (if (consp corfu-echo-delay)
                       (funcall (if corfu-echo--message #'cdr #'car)
                                corfu-echo-delay)
                     corfu-echo-delay))
            (fun-docsig (corfu--metadata-get 'company-docsig))
            (fun (lambda (cand) (or (funcall fun-docsig cand)
                                    (corfu-popupinfo--get-documentation cand))))
            (cand (and (>= corfu--index 0)
                       (nth corfu--index corfu--candidates))))
      (if (<= delay 0)
          (corfu-echo--show (funcall fun cand))
        (corfu-echo--cancel)
        (setq corfu-echo--timer
              (run-at-time delay nil
                           (lambda ()
                             (corfu-echo--show (funcall fun cand))))))
    (corfu-echo--cancel)))

[minad]

I think the documentation returned by company-doc-buffer is too verbose for the echo area. This is out of scope of Corfu.

[jdtsmith]

Not completely related, but here's what I do to solve the "too much information at a glance" issue, or if I want to save and compare two different docs while scrolling through candidates:

  ;; C-u M-h gives us a persistent doc buffer for the candidate
  (advice-add #'corfu-popupinfo-documentation :before-until
	      (lambda ()
		(interactive)
		(when current-prefix-arg
		  (corfu-info-documentation 'persist) t)))