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

   1 ;;; company-dabbrev.el --- a dabbrev-like company-mode completion back-end
   2 ;;
   3 ;; Copyright (C) 2009 Nikolaj Schumacher
   4 ;;
   5 ;; This file is part of company 0.5.
   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-dabbrev-other-buffers 'all
  24   "*Determines whether `company-dabbrev' should search other buffers.
  25 If 'all, search all other buffers.  If t, search buffers with the same
  26 major-mode.
  27 See also `company-dabbrev-time-limit'."
  28   :group 'company
  29   :type '(choice (const :tag "Off" nil)
  30                  (const :tag "Same major mode" t)
  31                  (const :tag "All" all)))
  32
  33 (defcustom company-dabbrev-time-limit .5
  34   "*Determines how many seconds `company-dabbrev' should look for matches."
  35   :group 'company
  36   :type '(choice (const :tag "Off" nil)
  37                  (number :tag "Seconds")))
  38
  39 (defcustom company-dabbrev-char-regexp "\\sw"
  40   "*A regular expression matching the characters `company-dabbrev' looks for."
  41   :group 'company
  42   :type 'regexp)
  43
  44 (defmacro company-dabrev--time-limit-while (test start limit &rest body)
  45   (declare (indent 3) (debug t))
  46   `(let ((company-time-limit-while-counter 0))
  47      (catch 'done
  48        (while ,test
  49          ,@body
  50          (and ,limit
  51               (eq (incf company-time-limit-while-counter) 25)
  52               (setq company-time-limit-while-counter 0)
  53               (> (float-time (time-since ,start)) ,limit)
  54               (throw 'done 'company-time-out))))))
  55
  56 (defsubst company-dabbrev--make-regexp (prefix)
  57   (concat "\\<" (if (equal prefix "")
  58               company-dabbrev-char-regexp
  59             (regexp-quote prefix))
  60           "\\(" company-dabbrev-char-regexp "\\)*\\>"))
  61
  62 (defun company-dabbrev--search-buffer (regexp pos symbols start limit
  63                                        ignore-comments)
  64   (save-excursion
  65     (let (match)
  66       (goto-char (if pos (1- pos) (point-min)))
  67       ;; search before pos
  68       (company-dabrev--time-limit-while (re-search-backward regexp nil t)
  69           start limit
  70         (setq match (match-string-no-properties 0))
  71         (if (and ignore-comments (company-in-string-or-comment))
  72             (re-search-backward "\\s<\\|\\s!\\|\\s\"\\|\\s|" nil t)
  73           (push match symbols)))
  74       (goto-char (or pos (point-min)))
  75       ;; search after pos
  76       (company-dabrev--time-limit-while (re-search-forward regexp nil t)
  77           start limit
  78         (setq match (match-string-no-properties 0))
  79         (if (and ignore-comments (company-in-string-or-comment))
  80             (re-search-forward "\\s>\\|\\s!\\|\\s\"" nil t)
  81           (push match symbols)))
  82       symbols)))
  83
  84 (defun company-dabbrev--search (regexp &optional limit other-buffers
  85                                 ignore-comments)
  86   (let* ((start (current-time))
  87          (symbols (company-dabbrev--search-buffer regexp (point) nil start limit
  88                                                   ignore-comments)))
  89     (when other-buffers
  90       (dolist (buffer (delq (current-buffer) (buffer-list)))
  91         (and (or (eq other-buffers 'all)
  92                  (eq (buffer-local-value 'major-mode buffer) major-mode))
  93              (with-current-buffer buffer
  94                (setq symbols
  95                      (company-dabbrev--search-buffer regexp nil symbols start
  96                                                      limit ignore-comments))))
  97         (and limit
  98              (> (float-time (time-since start)) limit)
  99              (return))))
 100     symbols))
 101
 102 ;;;###autoload
 103 (defun company-dabbrev (command &optional arg &rest ignored)
 104   "A dabbrev-like `company-mode' completion back-end."
 105   (interactive (list 'interactive))
 106   (case command
 107     ('interactive (company-begin-backend 'company-dabbrev))
 108     ('prefix (company-grab-word))
 109     ('candidates
 110      (mapcar 'downcase
 111              (company-dabbrev--search (company-dabbrev--make-regexp arg)
 112                                       company-dabbrev-time-limit
 113                                       company-dabbrev-other-buffers)))
 114     ('ignore-case t)
 115     ('duplicates t)))
 116
 117 (provide 'company-dabbrev)
 118 ;;; company-dabbrev.el ends here