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) 2009-2010 Nikolaj Schumacher
   4 ;;
   5 ;; This file is part of company 0.5.
   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 (require 'etags)
  22
  23 (defcustom company-etags-use-main-table-list t
  24   "*Always search `tags-table-list' if set.
  25 If this is disabled, `company-etags' will try to find the one table for each
  26 buffer automatically."
  27   :group 'company-mode
  28   :type '(choice (const :tag "off" nil)
  29                  (const :tag "on" t)))
  30
  31 (defvar company-etags-modes '(c-mode objc-mode c++-mode java-mode jde-mode
  32                               pascal-mode perl-mode python-mode))
  33
  34 (defvar company-etags-buffer-table 'unknown)
  35 (make-variable-buffer-local 'company-etags-buffer-table)
  36
  37 (defun company-etags-find-table ()
  38   (let ((file (company-locate-dominating-file (or buffer-file-name
  39                                                   default-directory)
  40                                               "TAGS")))
  41     (when file
  42       (list (expand-file-name file)))))
  43
  44 (defun company-etags-buffer-table ()
  45   (or (and company-etags-use-main-table-list tags-table-list)
  46       (if (eq company-etags-buffer-table 'unknown)
  47           (setq company-etags-buffer-table (company-etags-find-table))
  48         company-etags-buffer-table)))
  49
  50 (defun company-etags--candidates (prefix)
  51   (let ((tags-table-list (company-etags-buffer-table))
  52         (completion-ignore-case nil))
  53     (and (or tags-file-name tags-table-list)
  54          (fboundp 'tags-completion-table)
  55          (save-excursion
  56            (visit-tags-table-buffer)
  57            (all-completions prefix (tags-completion-table))))))
  58
  59 ;;;###autoload
  60 (defun company-etags (command &optional arg &rest ignored)
  61   "A `company-mode' completion back-end for etags."
  62   (interactive (list 'interactive))
  63   (case command
  64     ('interactive (company-begin-backend 'company-etags))
  65     ('prefix (and (memq major-mode company-etags-modes)
  66                   (not (company-in-string-or-comment))
  67                   (company-etags-buffer-table)
  68                   (or (company-grab-symbol) 'stop)))
  69     ('candidates (company-etags--candidates arg))
  70     ('location (let ((tags-table-list (company-etags-buffer-table)))
  71                  (when (fboundp 'find-tag-noselect)
  72                    (save-excursion
  73                      (let ((buffer (find-tag-noselect arg)))
  74                        (cons buffer (with-current-buffer buffer (point))))))))
  75     ('sorted t)))
  76
  77 (provide 'company-etags)
  78 ;;; company-etags.el ends here