an YaTeX http://www.yatex.org/ extension of Auto Complete Mode http://cx4a.org/software/auto-complete/ We remark that we recommend auto-complete-latex https://bitbucket.org/tequilasunset/auto-complete-latex :)

auto-complete-yatex.el

;;; auto-complete-yatex.el --- A YaTeX extention for Auto Complete Mode

;; Copyright (C) 2008-2011  Munehiro Yamamoto

;; Author: Munehiro Yamamoto <munepixyz@gmail.com>
;; Keywords: YaTeX LaTeX TeX
;; Version: 1.3.1.1

;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with this program.  If not, see <http://www.gnu.org/licenses/>.

;;; History:

;; 2011-08-24 Munehiro Yamamoto <munepixyz@gmail.com>
;;
;;      * supported auto-complete-mode v1.3.1
;; 
;; 2008-03-04 Munehiro Yamamoto <munepixyz@gmail.com>
;;
;;      * added original YaTeX keywords to ac-yatex-keywords
;;      * defvar ac-yatex-user-keywords
;;
;; 2008-03-01 Munehiro Yamamoto <munepixyz@gmail.com>
;;
;;      * first release
;;

(require 'auto-complete)
(require 'yatex)
(require 'yatexadd)
;(require 'yatexmth)
;(require 'yatexpkg)
;(require 'yatexsec)

(defvar ac-source-yatex-user-candiates nil
  "A list of your YaTeX keywords.")

(defvar ac-source-yatex-candiates
  ;; (sort 
   (append 
    ac-source-yatex-user-candiates

    ;; yatex.el
    section-table user-section-table tmp-section-table
    YaTeX-math-begin-list
    YaTeX-math-gathering-list
    env-table user-env-table tmp-env-table
    fontsize-table user-fontsize-table tmp-fontsize-table
    singlecmd-table user-singlecmd-table tmp-singlecmd-table

    ;; yatexadd.el
    YaTeX:style-parameters-default 
    YaTeX:style-parameters-private 
    YaTeX:style-parameters-local
    ;; YaTeX:documentstyles-default
    ;; YaTeX:documentstyles-private
    ;; YaTeX:documentstyles-local
    ;; YaTeX:documentstyle-options-default
    ;; YaTeX:documentstyle-options-private
    ;; YaTeX:documentstyle-options-local
    YaTeX:documentclass-options-default
    YaTeX:documentclass-options-private
    YaTeX:documentclass-options-local
    YaTeX:documentclasses-default
    YaTeX:documentclasses-private
    YaTeX:documentclasses-local
    YaTeX:latex2e-named-color-alist
    YaTeX:latex2e-basic-color-alist
    YaTeX::usepackage-alist-default
    YaTeX::usepackage-alist-private
    YaTeX::usepackage-alist-local

    ;; yatexmth.el
    ;YaTeX-math-sign-alist
    ;YaTeX-greek-key-alist

    ;; yatexpkg.el
    ;YaTeX-package-alist-default
    ;YaTeX-package-graphics-driver-alist
    ;YaTeX-package-alist-private
    
    ;; yatexsec.el
    ;YaTeX-sectioning-level
    );; #'(lambda (a b) (> (length a) (length b)))
   )

(defvar ac-source-yatex
  '((candidates
     . (lambda ()
	 (all-completions ac-target ac-source-yatex-candiates))))
  "A Source of YaTeX keywords")

(defun ac-yatex-setup ()
  (add-to-list 'ac-modes 'yatex-mode)
  (add-to-list 'ac-sources 'ac-source-yatex)
  )

(add-hook 'yatex-mode-hook 'ac-yatex-setup)


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(provide 'auto-complete-yatex)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; Local Variables:
;; mode: emacs-lisp
;; End:

wnn7egg による日本語入力モードのとき、auto-complete-mode を off にするには、以下のようにしていた。

(defadvice toggle-input-method (after wnn7egg-activate activate)
  (if wnn7-activate
      (global-auto-complete-mode 0) (global-auto-complete-mode 1)))

同じようにして、一般には以下でいけるみたい。

(defadvice toggle-input-method (after current-input-method activate)
  (if current-input-method
      (global-auto-complete-mode 0) (global-auto-complete-mode 1)))