disable company-mode completion inside comments

Question

This is something that's been bothering me for a while. I think I've configured company-mode backends wrong as I'm also getting company backends when inside comments.

Here is my company-mode config file. And here is an example of how I enable company-mode for specific major modes using a local variable for company-backends and adding that to the major mode hook. Like so:-

    (defun my-racer-mode-hook ()
      (set (make-local-variable 'company-backends)
           '((company-capf company-files company-yasnippet))))
    (add-hook 'racer-mode-hook 'my-racer-mode-hook)

I configure other major modes very similarly to the snippet above. But, I feel I did a mistake somewhere that's making company-yasnippet to pop up in the comments also. Can someone please point out where I did wrong ?

EDIT: I get completion from all backends inside the comments, not just company-yasnippet. Sorry for the confusion.

Answer 1

Each backend decides whether it works in the given context.

• company-yasnippet works everywhere (you can counteract this using the keyword :with).
• company-files works where it sees a beginning of an existing file name.
• company-capf works where one of the elements in completion-at-point-functions says it works.

Since around 25.1, elisp-completion-at-point refuses to operate inside strings and comments (except when following a backtick, to complete symbol references).

You should probably open an issue at emacs-racer and ask for racer-complete-at-point to behave similarly.