make company-backends work in lisp files

Question

I have a running Emacs on my gentoo, with doom configuration (with evil mode disabled). It works great. One issue i want to solve...

Some company-backends - for example like company-files in Lisp files, do not work.

When I run Emacs and try to enter a path to a load function - nothing happens. If I do eval-buffer on the file that I have the company-backends settings - it starts to work. So it seems that that piece of code runs too late.

Here's what i do: On my .doom.d/config.el file I load my custom el file. in that file I do

(after! company (setq company-backend '(company-files company-capf)) )

I also tried to add (setq company-backends '(company-files)) to the config.el file.

None of the above worked.

Answer 1

Doom has its own function set-company-backend! to set the backends:

(defun set-company-backend! (modes &rest backends)
  "Prepends BACKENDS (in order) to `company-backends' in MODES.

MODES should be one symbol or a list of them, representing major or minor modes.
This will overwrite backends for MODES on consecutive uses.

If the car of BACKENDS is nil, unset the backends for MODES.

Examples:
  (set-company-backend! 'js2-mode
    'company-tide 'company-yasnippet)

...

You can also change the default backends used. They are defined in +company-backend-alist:

(defvar +company-backend-alist
  '((text-mode company-dabbrev company-yasnippet company-ispell)
    (prog-mode company-capf company-yasnippet)
    (conf-mode company-capf company-dabbrev-code company-yasnippet))
  "An alist matching modes to company backends. The backends for any mode is
built from this.")

Those variables and functions are defined in https://github.com/hlissner/doom-emacs/blob/develop/modules/completion/company/autoload.el.