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I've installed the company package in order to get an auto-completion functionality. It works well in my ESS environment, but no in latex. In fact, no completions are showed in latex buffers when I activate M-x company-mode. What could be the problem?

Here it is my .emacs config for latex

(setq TeX-parse-self t)
(setq-default TeX-master nil)

;;
;;ispell config
;;
(setq ispell-program-name "hunspell")
(setq ispell-local-dictionary "es_ES") ;; Change dictionaries here!
(setq ispell-local-dictionary-alist
      '(("es_ES" "[[:alpha:]]" "[^[:alpha:]]" "[']" nil nil nil utf-8)))

(add-hook 'LaTeX-mode-hook 'visual-line-mode)
(add-hook 'LaTeX-mode-hook 'LaTeX-math-mode)
(add-hook 'LaTeX-mode-hook 'TeX-source-correlate-mode)

(add-hook 'LaTeX-mode-hook 'turn-on-reftex)
(setq reftex-plug-into-AUCTeX t)
(setq TeX-PDF-mode t)

(setq TeX-output-view-style
    (quote
     (("^pdf$" "." "evince -f %o")
      ("^html?$" "." "iceweasel %o"))))

UPDATE:

Removing auto complete configuration for other environments from the init file and adding the following line solves the problem.

;;
;; COMPANY
;;

(use-package company
  :ensure t
  :config
  (setq company-idle-delay 0)
  (setq company-minimum-prefix-length 2)

  (global-company-mode t)
  )
  • Do you have any company completion backend for LaTeX installed?. You will can use either company-auctex or company-math for the completions to work. See Here company-auctex or here company-math. – minibuffer Sep 16 at 16:52
  • Just curious: Why don't you use the completion offered by AUCTeX itself? Try C-c C-m (or C-c RET) for macros and C-c C-e for environments? With (setq TeX-parse-self t) in your init file, you get completion support for packages you use as well (packages supported by AUCTeX). – Arash Esbati Sep 18 at 6:38
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As an alternative, if you use lsp-mode (https://github.com/emacs-lsp/lsp-mode), there is recent support for LaTeX via the Digestif LaTeX language server (https://github.com/astoff/digestif).

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