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 0.3.
   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-modes '(c-mode objc-mode c++-mode java-mode jde-mode
  33                               pascal-mode perl-mode python-mode))
  34
  35 (defvar company-etags-buffer-table 'unknown)
  36 (make-variable-buffer-local 'company-etags-buffer-table)
  37
  38 (defun company-etags-find-table ()
  39   (let ((dir (if buffer-file-name
  40                  (file-name-directory buffer-file-name)
  41                (expand-file-name default-directory)))
  42         file)
  43     (while (not (or file (equal dir "/")))
  44       (unless (file-exists-p (setq file (expand-file-name "TAGS" dir)))
  45         (setq file nil
  46               dir (file-name-directory (directory-file-name dir)))))
  47     (when file
  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 ;;;###autoload
  57 (defun company-etags (command &optional arg &rest ignored)
  58   "A `company-mode' completion back-end for etags."
  59   (interactive (list 'interactive))
  60   (case command
  61     ('interactive (company-begin-backend 'company-etags))
  62     ('prefix (and (memq major-mode company-etags-modes)
  63                   (not (company-in-string-or-comment))
  64                   (require 'etags nil t)
  65                   (company-etags-buffer-table)
  66                   (company-grab-symbol)))
  67     ('candidates (let ((tags-table-list (company-etags-buffer-table))
  68                        (completion-ignore-case nil))
  69                    (and (fboundp 'tags-completion-table)
  70                         (all-completions arg (tags-completion-table)))))
  71     ('location (let ((tags-table-list (company-etags-buffer-table)))
  72                  (when (fboundp 'find-tag-noselect)
  73                    (let ((buffer (find-tag-noselect arg)))
  74                      (cons buffer (with-current-buffer buffer (point)))))))
  75     ('sorted t)))
  76
  77 (add-to-list 'company-backends 'company-etags)
  78
  79 (provide 'company-etags)
  80 ;;; company-etags.el ends here
  81
  82