code.delx.au - gnu-emacs-elpa/blob - packages/company-0.5/company-gtags.el

   1 ;;; company-gtags.el --- a company-mode completion back-end for GNU Global
   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 'cl))
  26
  27 (defcustom company-gtags-executable
  28   (executable-find "global")
  29   "*Location of GNU global executable"
  30   :type 'string
  31   :group 'company)
  32
  33 (define-obsolete-variable-alias
  34   'company-gtags-gnu-global-program-name
  35   'company-gtags-executable "earlier")
  36
  37 (defvar company-gtags--tags-available-p 'unknown)
  38 (make-variable-buffer-local 'company-gtags--tags-available-p)
  39
  40 (defvar company-gtags-modes '(c-mode c++-mode jde-mode java-mode php-mode))
  41
  42 (defun company-gtags--tags-available-p ()
  43   (if (eq company-gtags--tags-available-p 'unknown)
  44       (setq company-gtags--tags-available-p
  45             (company-locate-dominating-file buffer-file-name "GTAGS"))
  46     company-gtags--tags-available-p))
  47
  48 (defun company-gtags-fetch-tags (prefix)
  49   (with-temp-buffer
  50     (let (tags)
  51       (when (= 0 (call-process company-gtags-executable nil
  52                                (list (current-buffer) nil) nil "-c" prefix))
  53         (goto-char (point-min))
  54         (split-string (buffer-string) "\n" t)))))
  55
  56 (defun company-gtags-location (tag)
  57   (with-temp-buffer
  58     (when (= 0 (call-process company-gtags-executable nil
  59                              (list (current-buffer) nil) nil "-x" tag))
  60         (goto-char (point-min))
  61         (when (looking-at (concat (regexp-quote tag)
  62                                   "[ \t]+\\([[:digit:]]+\\)"
  63                                   "[ \t]+\\([^ \t]+\\)"))
  64           (cons (expand-file-name (match-string 2))
  65                 (string-to-number (match-string 1)))))))
  66
  67 ;;;###autoload
  68 (defun company-gtags (command &optional arg &rest ignored)
  69   "A `company-mode' completion back-end for GNU Global."
  70   (interactive (list 'interactive))
  71   (case command
  72     ('interactive (company-begin-backend 'company-gtags))
  73     ('prefix (and company-gtags-executable
  74                   (memq major-mode company-gtags-modes)
  75                   (not (company-in-string-or-comment))
  76                   (company-gtags--tags-available-p)
  77                   (or (company-grab-symbol) 'stop)))
  78     ('candidates (company-gtags-fetch-tags arg))
  79     ('sorted t)
  80     ('location (company-gtags-location arg))))
  81
  82 (provide 'company-gtags)
  83 ;;; company-gtags.el ends here