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+;;; company-etags.el --- company-mode completion backend for etags
+
+;; Copyright (C) 2009-2011, 2014  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 'etags)
+
+(defgroup company-etags nil
+  "Completion backend for etags."
+  :group 'company)
+
+(defcustom company-etags-use-main-table-list t
+  "Always search `tags-table-list' if set.
+If this is disabled, `company-etags' will try to find the one table for each
+buffer automatically."
+  :type '(choice (const :tag "off" nil)
+                 (const :tag "on" t)))
+
+(defcustom company-etags-ignore-case nil
+  "Non-nil to ignore case in completion candidates."
+  :type 'boolean
+  :package-version '(company . "0.7.3"))
+
+(defcustom company-etags-everywhere nil
+  "Non-nil to offer completions in comments and strings.
+Set it to t or to a list of major modes."
+  :type '(choice (const :tag "Off" nil)
+                 (const :tag "Any supported mode" t)
+                 (repeat :tag "Some major modes"
+                         (symbol :tag "Major mode")))
+  :package-version '(company . "0.9.0"))
+
+(defvar company-etags-modes '(prog-mode c-mode objc-mode c++-mode java-mode
+                              jde-mode pascal-mode perl-mode python-mode))
+
+(defvar-local company-etags-buffer-table 'unknown)
+
+(defun company-etags-find-table ()
+  (let ((file (expand-file-name
+               "TAGS"
+               (locate-dominating-file (or buffer-file-name
+                                           default-directory)
+                                       "TAGS"))))
+    (when (and file (file-regular-p file))
+      (list file))))
+
+(defun company-etags-buffer-table ()
+  (or (and company-etags-use-main-table-list tags-table-list)
+      (if (eq company-etags-buffer-table 'unknown)
+          (setq company-etags-buffer-table (company-etags-find-table))
+        company-etags-buffer-table)))
+
+(defun company-etags--candidates (prefix)
+  (let ((tags-table-list (company-etags-buffer-table))
+        (tags-file-name tags-file-name)
+        (completion-ignore-case company-etags-ignore-case))
+    (and (or tags-file-name tags-table-list)
+         (fboundp 'tags-completion-table)
+         (save-excursion
+           (visit-tags-table-buffer)
+           (all-completions prefix (tags-completion-table))))))
+
+;;;###autoload
+(defun company-etags (command &optional arg &rest ignored)
+  "`company-mode' completion backend for etags."
+  (interactive (list 'interactive))
+  (cl-case command
+    (interactive (company-begin-backend 'company-etags))
+    (prefix (and (apply #'derived-mode-p company-etags-modes)
+                 (or (eq t company-etags-everywhere)
+                     (apply #'derived-mode-p company-etags-everywhere)
+                     (not (company-in-string-or-comment)))
+                 (company-etags-buffer-table)
+                 (or (company-grab-symbol) 'stop)))
+    (candidates (company-etags--candidates arg))
+    (location (let ((tags-table-list (company-etags-buffer-table)))
+                (when (fboundp 'find-tag-noselect)
+                  (save-excursion
+                    (let ((buffer (find-tag-noselect arg)))
+                      (cons buffer (with-current-buffer buffer (point))))))))
+    (ignore-case company-etags-ignore-case)))
+
+(provide 'company-etags)
+;;; company-etags.el ends here