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

   1 ;;; company-elisp.el --- a company-mode completion back-end for emacs-lisp-mode
   2 ;;
   3 ;; Copyright (C) 2009 Nikolaj Schumacher
   4 ;;
   5 ;; This file is part of company.
   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 (defvar company-lisp-symbol-regexp
  24   "\\_<\\(\\sw\\|\\s_\\)+\\_>\\=")
  25
  26 (defun company-grab-lisp-symbol ()
  27   (let ((prefix (or (company-grab company-lisp-symbol-regexp) "")))
  28     (unless (and (company-in-string-or-comment (- (point) (length prefix)))
  29                  (/= (char-before (- (point) (length prefix))) ?`))
  30       prefix)))
  31
  32 (defun company-elisp-predicate (symbol)
  33   (or (boundp symbol)
  34       (fboundp symbol)))
  35
  36 (defvar company-elisp-parse-limit 30)
  37 (defvar company-elisp-parse-depth 100)
  38
  39 (defun company-elisp-parse-let ()
  40   (let (vars)
  41     (ignore-errors
  42       (save-excursion
  43         (dotimes (i company-elisp-parse-depth)
  44           (up-list -1)
  45           (save-excursion
  46             (when (looking-at "([ \t\n]*let")
  47               (down-list 2)
  48               (ignore-errors
  49                 (dotimes (i company-elisp-parse-limit)
  50                   (save-excursion
  51                     (down-list 1)
  52                     (if (looking-at "[ \t\n]*\\(\\(?:\\sw\\|\\s_\\)+\\)")
  53                         (add-to-list 'vars (match-string-no-properties 1))
  54                       (error)))
  55                   (forward-sexp))))))))
  56     vars))
  57
  58 (defun company-elisp-doc (symbol)
  59   (let* ((symbol (intern symbol))
  60          (doc (if (fboundp symbol)
  61                   (documentation symbol t)
  62                 (documentation-property symbol 'variable-documentation t))))
  63     (when (string-match ".*$" doc)
  64       (match-string 0 doc))))
  65
  66 (defun company-elisp (command &optional arg &rest ignored)
  67   (case command
  68     ('prefix (and (eq major-mode 'emacs-lisp-mode)
  69                   (company-grab-lisp-symbol)))
  70     ('candidates (let ((completion-ignore-case nil))
  71                    (append (all-completions arg (company-elisp-parse-let))
  72                            (all-completions arg obarray
  73                                             'company-elisp-predicate))))
  74     ('meta (company-elisp-doc arg))
  75     ('doc-buffer (describe-function 'describe-function)
  76                  (help-buffer))))
  77
  78 (provide 'company-elisp)
  79 ;;; company-elisp.el ends here