code.delx.au - gnu-emacs-elpa/blob - company-etags.el

   1 ;;; company-etags.el --- a company-mode completion back-end for etags
   2 ;;
   3 ;; Copyright (C) 2009 Nikolaj Schumacher
   4 ;;
   5 ;; This file is part of company 0.2.
   6 ;;
   7 ;; This program is free software; you can redistribute it and/or
   8 ;; modify it under the terms of the GNU General Public License
   9 ;; as published by the Free Software Foundation; either version 2
  10 ;; of the License, or (at your option) any later version.
  11 ;;
  12 ;; This program is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16 ;;
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 (require 'company)
  21 (eval-when-compile (require 'etags))
  22 (eval-when-compile (require 'cl))
  23
  24 (defcustom company-etags-use-main-table-list t
  25   "*Always search `tags-table-list' if set.
  26 If this is disabled, `company-etags' will try to find the one table for each
  27 buffer automatically."
  28   :group 'company-mode
  29   :type '(choice (const :tag "off" nil)
  30                  (const :tag "on" t)))
  31
  32 (defvar company-etags-symbol-regexp
  33   "\\_<[A-Za-z_][A-Za-z_0-9]*\\_>")
  34
  35 (defvar company-etags-modes '(c-mode objc-mode c++-mode java-mode jde-mode
  36                               pascal-mode perl-mode python-mode))
  37
  38 (defvar company-etags-buffer-table 'unknown)
  39 (make-variable-buffer-local 'company-etags-buffer-table)
  40
  41 (defun company-etags-find-table ()
  42   (let ((dir (file-name-directory buffer-file-name))
  43         file)
  44     (while (not (or file (equal dir "/")))
  45       (unless (file-exists-p (setq file (expand-file-name "TAGS" dir)))
  46         (setq file nil
  47               dir (file-name-directory (directory-file-name dir)))))
  48     (list file)))
  49
  50 (defun company-etags-buffer-table ()
  51   (or (and company-etags-use-main-table-list tags-table-list)
  52       (if (eq company-etags-buffer-table 'unknown)
  53           (setq company-etags-buffer-table (company-etags-find-table))
  54         company-etags-buffer-table)))
  55
  56 (defun company-etags (command &optional arg &rest ignored)
  57   "A `company-mode' completion back-end for etags."
  58   (case command
  59     ('prefix (and (memq major-mode company-etags-modes)
  60                   (not (company-in-string-or-comment))
  61                   (require 'etags nil t)
  62                   (company-etags-buffer-table)
  63                   (or (company-grab company-etags-symbol-regexp) "")))
  64     ('candidates (let ((tags-table-list (company-etags-buffer-table))
  65                        (completion-ignore-case nil))
  66                    (and (fboundp 'tags-completion-table)
  67                         (all-completions arg (tags-completion-table)))))
  68     ('location (let ((tags-table-list (company-etags-buffer-table)))
  69                  (when (fboundp 'find-tag-noselect)
  70                    (let ((buffer (find-tag-noselect arg)))
  71                      (cons buffer (with-current-buffer buffer (point)))))))
  72     ('sorted t)))
  73
  74 (add-to-list 'company-backends 'company-etags)
  75
  76 (provide 'company-etags)
  77 ;;; company-etags.el ends here
  78
  79