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

   1 ;;; company-gtags.el --- company-mode completion back-end for GNU Global
   2
   3 ;; Copyright (C) 2009-2011, 2014  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
  23 ;;; Commentary:
  24 ;;
  25
  26 ;;; Code:
  27
  28 (require 'company)
  29 (require 'cl-lib)
  30
  31 (defgroup company-gtags nil
  32   "Completion back-end for GNU Global."
  33   :group 'company)
  34
  35 (defcustom company-gtags-executable
  36   (executable-find "global")
  37   "Location of GNU global executable."
  38   :type 'string)
  39
  40 (define-obsolete-variable-alias
  41   'company-gtags-gnu-global-program-name
  42   'company-gtags-executable "earlier")
  43
  44 (defcustom company-gtags-insert-arguments t
  45   "When non-nil, insert function arguments as a template after completion."
  46   :type 'boolean
  47   :package-version '(company . "0.8.1"))
  48
  49 (defvar-local company-gtags--tags-available-p 'unknown)
  50
  51 (defvar company-gtags-modes '(c-mode c++-mode jde-mode java-mode php-mode))
  52
  53 (defun company-gtags--tags-available-p ()
  54   (if (eq company-gtags--tags-available-p 'unknown)
  55       (setq company-gtags--tags-available-p
  56             (locate-dominating-file buffer-file-name "GTAGS"))
  57     company-gtags--tags-available-p))
  58
  59 (defun company-gtags--fetch-tags (prefix)
  60   (with-temp-buffer
  61     (let (tags)
  62       (when (= 0 (call-process company-gtags-executable nil
  63                                (list (current-buffer) nil) nil "-xGq" (concat "^" prefix)))
  64         (goto-char (point-min))
  65         (cl-loop while
  66                  (re-search-forward (concat
  67                                      "^"
  68                                      "\\([^ ]*\\)" ;; completion
  69                                      "[ \t]+\\([[:digit:]]+\\)" ;; linum
  70                                      "[ \t]+\\([^ \t]+\\)" ;; file
  71                                      "[ \t]+\\(.*\\)" ;; definition
  72                                      "$"
  73                                      ) nil t)
  74                  collect
  75                  (propertize (match-string 1)
  76                              'meta (match-string 4)
  77                              'location (cons (expand-file-name (match-string 3))
  78                                              (string-to-number (match-string 2)))
  79                              ))))))
  80
  81 (defun company-gtags--annotation (arg)
  82   (let ((meta (get-text-property 0 'meta arg)))
  83     (when (string-match (concat arg "\\((.*)\\).*") meta)
  84       (match-string 1 meta))))
  85
  86 ;;;###autoload
  87 (defun company-gtags (command &optional arg &rest ignored)
  88   "`company-mode' completion back-end for GNU Global."
  89   (interactive (list 'interactive))
  90   (cl-case command
  91     (interactive (company-begin-backend 'company-gtags))
  92     (prefix (and company-gtags-executable
  93                  (memq major-mode company-gtags-modes)
  94                  (not (company-in-string-or-comment))
  95                  (company-gtags--tags-available-p)
  96                  (or (company-grab-symbol) 'stop)))
  97     (candidates (company-gtags--fetch-tags arg))
  98     (sorted t)
  99     (duplicates t)
 100     (annotation (company-gtags--annotation arg))
 101     (meta (get-text-property 0 'meta arg))
 102     (location (get-text-property 0 'location arg))
 103     (post-completion (let ((anno (company-gtags--annotation arg)))
 104                        (when (and company-gtags-insert-arguments anno)
 105                          (insert anno)
 106                          (company-template-c-like-templatify anno))))))
 107
 108 (provide 'company-gtags)
 109 ;;; company-gtags.el ends here