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+;;; company-ispell.el --- company-mode completion backend using Ispell
+
+;; Copyright (C) 2009-2011, 2013-2016 Free Software Foundation, Inc.
+
+;; Author: Nikolaj Schumacher
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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 GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
+
+
+;;; Commentary:
+;;
+
+;;; Code:
+
+(require 'company)
+(require 'cl-lib)
+(require 'ispell)
+
+(defgroup company-ispell nil
+ "Completion backend using Ispell."
+ :group 'company)
+
+(defcustom company-ispell-dictionary nil
+ "Dictionary to use for `company-ispell'.
+If nil, use `ispell-complete-word-dict'."
+ :type '(choice (const :tag "default (nil)" nil)
+ (file :tag "dictionary" t)))
+
+(defvar company-ispell-available 'unknown)
+
+(defalias 'company-ispell--lookup-words
+ (if (fboundp 'ispell-lookup-words)
+ 'ispell-lookup-words
+ 'lookup-words))
+
+(defun company-ispell-available ()
+ (when (eq company-ispell-available 'unknown)
+ (condition-case err
+ (progn
+ (company-ispell--lookup-words "WHATEVER")
+ (setq company-ispell-available t))
+ (error
+ (message "Company-Ispell: %s" (error-message-string err))
+ (setq company-ispell-available nil))))
+ company-ispell-available)
+
+;;;###autoload
+(defun company-ispell (command &optional arg &rest ignored)
+ "`company-mode' completion backend using Ispell."
+ (interactive (list 'interactive))
+ (cl-case command
+ (interactive (company-begin-backend 'company-ispell))
+ (prefix (when (company-ispell-available)
+ (company-grab-word)))
+ (candidates
+ (let ((words (company-ispell--lookup-words
+ arg
+ (or company-ispell-dictionary ispell-complete-word-dict)))
+ (completion-ignore-case t))
+ (if (string= arg "")
+ ;; Small optimization.
+ words
+ ;; Work around issue #284.
+ (all-completions arg words))))
+ (sorted t)
+ (ignore-case 'keep-prefix)))
+
+(provide 'company-ispell)
+;;; company-ispell.el ends here