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

   1 ;;; company-gtags.el --- a company-mode completion back-end for GNU Global
   2 ;;
   3 ;; Copyright (C) 2009 Nikolaj Schumacher
   4 ;;
   5 ;; This file is part of company 0.4.2.
   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 'cl))
  22
  23 (defcustom company-gtags-executable
  24   (executable-find "global")
  25   "*Location of GNU global executable"
  26   :type 'string
  27   :group 'company)
  28
  29 (define-obsolete-variable-alias
  30   'company-gtags-gnu-global-program-name
  31   'company-gtags-executable)
  32
  33 (defvar company-gtags--tags-available-p 'unknown)
  34 (make-variable-buffer-local 'company-gtags--tags-available-p)
  35
  36 (defvar company-gtags-modes '(c-mode c++-mode jde-mode java-mode php-mode))
  37
  38 (defun company-gtags--tags-available-p ()
  39   (if (eq company-gtags--tags-available-p 'unknown)
  40       (setq company-gtags--tags-available-p
  41             (company-locate-dominating-file buffer-file-name "GTAGS"))
  42     company-gtags--tags-available-p))
  43
  44 (defun company-gtags-fetch-tags (prefix)
  45   (with-temp-buffer
  46     (let (tags)
  47       (when (= 0 (call-process company-gtags-executable nil
  48                                (list (current-buffer) nil) nil "-c" prefix))
  49         (goto-char (point-min))
  50         (split-string (buffer-string) "\n" t)))))
  51
  52 (defun company-gtags-location (tag)
  53   (with-temp-buffer
  54     (when (= 0 (call-process company-gtags-executable nil
  55                              (list (current-buffer) nil) nil "-x" tag))
  56         (goto-char (point-min))
  57         (when (looking-at (concat (regexp-quote tag)
  58                                   "[ \t]+\\([[:digit:]]+\\)"
  59                                   "[ \t]+\\([^ \t]+\\)"))
  60           (cons (expand-file-name (match-string 2))
  61                 (string-to-number (match-string 1)))))))
  62
  63 ;;;###autoload
  64 (defun company-gtags (command &optional arg &rest ignored)
  65   "A `company-mode' completion back-end for GNU Global."
  66   (interactive (list 'interactive))
  67   (case command
  68     ('interactive (company-begin-backend 'company-gtags))
  69     ('prefix (and company-gtags-executable
  70                   (memq major-mode company-gtags-modes)
  71                   (not (company-in-string-or-comment))
  72                   (company-gtags--tags-available-p)
  73                   (or (company-grab-symbol) 'stop)))
  74     ('candidates (company-gtags-fetch-tags arg))
  75     ('sorted t)
  76     ('location (company-gtags-location arg))))
  77
  78 (provide 'company-gtags)
  79 ;;; company-gtags.el ends here