Add completion-at-point-function

[vmsp]

It would be great if emmet supported a completion at point function so it could be easily plugged into Emacs' completion system.

https://www.gnu.org/software/emacs/manual/html_node/elisp/Completion-in-Buffers.html

[vmsp]

In case someone finds this useful, I ended up doing:

(defun vsp/emmet-expand ()
  (let ((bounds (bounds-of-thing-at-point 'symbol)))
    (list (car bounds) (cdr bounds)
          (lambda (str pred action) (emmet-transform str))
          :exclusive 'no)))