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 0.3.
   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 'cl))
  22
  23 (defcustom company-gtags-gnu-global-program-name
  24   (or (locate-file "global" exec-path exec-suffixes 'file-executable-p)
  25       "global")
  26   "*"
  27   :type 'string
  28   :group 'company)
  29
  30 (defvar company-gtags-symbol-regexp
  31   "\\_<[A-Za-z_][A-Za-z_0-9]*\\_>")
  32
  33 (defvar company-gtags-modes '(c-mode c++-mode jde-mode java-mode php-mode))
  34
  35 (defvar company-gtags-available 'unknown)
  36 (make-variable-buffer-local 'company-gtags-available)
  37
  38 (defun company-gtags-available ()
  39   (when (eq company-gtags-available 'unknown)
  40     (condition-case err
  41         (setq company-gtags-available
  42               (= 0 (call-process company-gtags-gnu-global-program-name
  43                                  nil nil nil "-c" "WHATEVER")))
  44       (error
  45        (message "Company: GNU Global not found")
  46        (setq-default company-gtags-available nil))))
  47   company-gtags-available)
  48
  49 (defun company-gtags-fetch-tags (prefix)
  50   (with-temp-buffer
  51     (let (tags)
  52       (when (= 0 (call-process "global" nil (list (current-buffer) nil)
  53                                nil "-c" prefix))
  54         (goto-char (point-min))
  55         (while (looking-at company-gtags-symbol-regexp)
  56           (push (match-string-no-properties 0) tags)
  57           (forward-line)))
  58       (nreverse tags))))
  59
  60 (defun company-gtags-location (tag)
  61   (with-temp-buffer
  62     (when (= 0 (call-process "global" nil (list (current-buffer) nil)
  63                                nil "-x" tag))
  64         (goto-char (point-min))
  65         (when (looking-at (concat (regexp-quote tag)
  66                                   "[ \t]+\\([[:digit:]]+\\)"
  67                                   "[ \t]+\\([^ \t]+\\)"))
  68           (cons (expand-file-name (match-string 2))
  69                 (string-to-number (match-string 1)))))))
  70
  71 ;;;###autoload
  72 (defun company-gtags (command &optional arg &rest ignored)
  73   "A `company-mode' completion back-end for GNU Global."
  74   (interactive (list 'interactive))
  75   (case command
  76     ('interactive (company-begin-backend 'company-gtags))
  77     ('prefix (and (memq major-mode company-gtags-modes)
  78                   (not (company-in-string-or-comment))
  79                   (company-gtags-available)
  80                (or (company-grab company-gtags-symbol-regexp) "")))
  81     ('candidates (company-gtags-fetch-tags arg))
  82     ('sorted t)
  83     ('location (company-gtags-location arg))))
  84
  85 (provide 'company-gtags)
  86 ;;; company-gtags.el ends here
  87
  88