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

   1 ;;; company-yasnippet.el --- company-mode completion back-end for Yasnippet
   2
   3 ;; Copyright (C) 2014  Free Software Foundation, Inc.
   4
   5 ;; Author: Dmitry Gutov
   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 'yasnippet)
  29
  30 (defun company-yasnippet--candidates (prefix)
  31   (mapcan
  32    (lambda (table)
  33      (let ((keyhash (yas--table-hash table))
  34            res)
  35        (when keyhash
  36          (maphash
  37           (lambda (key value)
  38             (when (and (stringp key)
  39                        (string-prefix-p prefix key))
  40               (maphash
  41                (lambda (name template)
  42                  (push
  43                   (propertize key
  44                               'yas-annotation name
  45                               'yas-template template)
  46                   res))
  47                value)))
  48           keyhash))
  49        res))
  50    (yas--get-snippet-tables)))
  51
  52 ;;;###autoload
  53 (defun company-yasnippet (command &optional arg &rest ignore)
  54   "`company-mode' back-end for `yasnippet'.
  55
  56 This back-end is supposed to be used in a particular way:
  57
  58 * In a buffer-local value of `company-backends'.
  59 * Grouped with a backend or several that provide actual text completions.
  60
  61 Neither condition is mandatory, but as long as there are snippets defined
  62 for the current major mode, this back-end will always shadow back-ends that
  63 come after it. So any other back-ends intended to be used in the current
  64 buffer should be grouped with it.  Example config:
  65
  66   (add-hook 'js-mode-hook
  67             (lambda ()
  68               (set (make-local-variable 'company-backends)
  69                    '((company-dabbrev-code company-yasnippet))))"
  70   (interactive (list 'interactive))
  71   (case command
  72     (interactive (company-begin-backend 'company-yasnippet))
  73     (prefix
  74      ;; Should probably use `yas--current-key', but that's bound to be slower.
  75      ;; How many trigger keys start with non-symbol characters anyway?
  76      (and yas-minor-mode
  77           (company-grab-symbol)))
  78     (annotation (concat " -> " (get-text-property 0 'yas-annotation arg)))
  79     (candidates (company-yasnippet--candidates arg))
  80     (post-completion
  81      (let ((template (get-text-property 0 'yas-template arg)))
  82        (yas-expand-snippet (yas--template-content template)
  83                            (- (point) (length arg))
  84                            (point)
  85                            (yas--template-expand-env template))))))
  86
  87 (provide 'company-yasnippet)
  88 ;;; company-yasnippet.el ends here