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

   1 ;;; company-etags.el --- a company-mode completion back-end for etags
   2
   3 ;; Copyright (C) 2009, 2010 Free Software Foundation, Inc.
   4
   5 ;; Author: Nikolaj Schumacher
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software: you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation, either version 3 of the License, or
  12 ;; (at your option) any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 ;;; Code:
  23
  24 (require 'company)
  25 (eval-when-compile (require 'etags))
  26 (eval-when-compile (require 'cl))
  27
  28 (defcustom company-etags-use-main-table-list t
  29   "*Always search `tags-table-list' if set.
  30 If this is disabled, `company-etags' will try to find the one table for each
  31 buffer automatically."
  32   :group 'company-mode
  33   :type '(choice (const :tag "off" nil)
  34                  (const :tag "on" t)))
  35
  36 (defvar company-etags-modes '(c-mode objc-mode c++-mode java-mode jde-mode
  37                               pascal-mode perl-mode python-mode))
  38
  39 (defvar company-etags-buffer-table 'unknown)
  40 (make-variable-buffer-local 'company-etags-buffer-table)
  41
  42 (defun company-etags-find-table ()
  43   (let ((file (company-locate-dominating-file (or buffer-file-name
  44                                                   default-directory)
  45                                               "TAGS")))
  46     (when file
  47       (list (expand-file-name file)))))
  48
  49 (defun company-etags-buffer-table ()
  50   (or (and company-etags-use-main-table-list tags-table-list)
  51       (if (eq company-etags-buffer-table 'unknown)
  52           (setq company-etags-buffer-table (company-etags-find-table))
  53         company-etags-buffer-table)))
  54
  55 ;;;###autoload
  56 (defun company-etags (command &optional arg &rest ignored)
  57   "A `company-mode' completion back-end for etags."
  58   (interactive (list 'interactive))
  59   (case command
  60     ('interactive (company-begin-backend 'company-etags))
  61     ('prefix (and (memq major-mode company-etags-modes)
  62                   (not (company-in-string-or-comment))
  63                   (require 'etags nil t)
  64                   (company-etags-buffer-table)
  65                   (or (company-grab-symbol) 'stop)))
  66     ('candidates (let ((tags-table-list (company-etags-buffer-table))
  67                        (completion-ignore-case nil))
  68                    (and (or tags-file-name tags-table-list)
  69                         (fboundp 'tags-completion-table)
  70                         tags-table-list
  71                         (all-completions arg (tags-completion-table)))))
  72     ('location (let ((tags-table-list (company-etags-buffer-table)))
  73                  (when (fboundp 'find-tag-noselect)
  74                    (save-excursion
  75                      (let ((buffer (find-tag-noselect arg)))
  76                        (cons buffer (with-current-buffer buffer (point))))))))
  77     ('sorted t)))
  78
  79 (provide 'company-etags)
  80 ;;; company-etags.el ends here