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 (prefix vars)
  40   (let ((regexp (concat "[ \t\n]*\\(" (regexp-quote prefix)
  41                         "\\(?:\\sw\\|\\s_\\)*\\_>\\)")))
  42     (ignore-errors
  43       (save-excursion
  44         (dotimes (i company-elisp-parse-depth)
  45           (up-list -1)
  46           (save-excursion
  47             (when (looking-at "([ \t\n]*let")
  48               (down-list 2)
  49               (ignore-errors
  50                 (dotimes (i company-elisp-parse-limit)
  51                   (save-excursion
  52                     (when (looking-at "[ \t\n]*(")
  53                       (down-list 1))
  54                     (if (looking-at regexp)
  55                         (add-to-list 'vars (match-string-no-properties 1))
  56                       (error)))
  57                   (forward-sexp))))))))
  58     vars))
  59
  60 (defun company-elisp-candidates (prefix)
  61   (let* ((completion-ignore-case nil)
  62          (candidates (all-completions prefix obarray 'company-elisp-predicate)))
  63     (company-elisp-parse-let prefix candidates)))
  64
  65 (defun company-elisp-doc (symbol)
  66   (let* ((symbol (intern symbol))
  67          (doc (if (fboundp symbol)
  68                   (documentation symbol t)
  69                 (documentation-property symbol 'variable-documentation t))))
  70     (and (stringp doc)
  71          (string-match ".*$" doc)
  72          (match-string 0 doc))))
  73
  74 (defun company-elisp (command &optional arg &rest ignored)
  75   "A `company-mode' completion back-end for `emacs-lisp-mode'."
  76   (case command
  77     ('prefix (and (eq (derived-mode-p 'emacs-lisp-mode) 'emacs-lisp-mode)
  78                   (company-grab-lisp-symbol)))
  79     ('candidates (company-elisp-candidates arg))
  80     ('meta (company-elisp-doc arg))
  81     ('doc-buffer (let ((symbol (intern arg)))
  82                    (when (or (ignore-errors (describe-function symbol))
  83                              (ignore-errors (describe-variable symbol)))
  84                      (help-buffer))))))
  85
  86 (provide 'company-elisp)
  87 ;;; company-elisp.el ends here