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

   1 ;;; company-template.el
   2
   3 ;; Copyright (C) 2009, 2010 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 ;;; Code:
  23
  24 (eval-when-compile (require 'cl))
  25
  26 (defface company-template-field
  27   '((((background dark)) (:background "yellow" :foreground "black"))
  28     (((background light)) (:background "orange" :foreground "black")))
  29   "Face used for editable text in template fields."
  30   :group 'company)
  31
  32 (defvar company-template-nav-map
  33   (let ((keymap (make-sparse-keymap)))
  34     (define-key keymap [remap forward-word] 'company-template-forward-field)
  35     (define-key keymap [remap subword-forward] 'company-template-forward-field)
  36     ;; M-n
  37     keymap))
  38
  39 ;; interactive ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  40
  41 (defsubst company-template-templates-at (pos)
  42   (let (os)
  43     (dolist (o (overlays-at pos))
  44       (when (overlay-get o 'company-template-fields)
  45         (push o os)))
  46     os))
  47
  48 (defun company-template-move-to-first (templ)
  49   (interactive)
  50   (let ((fields (overlay-get templ 'company-template-fields)))
  51     (push-mark)
  52     (goto-char (apply 'min (mapcar 'overlay-start fields)))))
  53
  54 (defun company-template-forward-field ()
  55   (interactive)
  56   (let* ((templates (company-template-templates-at (point)))
  57          (minimum (apply 'max (mapcar 'overlay-end templates)))
  58          (fields (apply 'append
  59                         (mapcar (lambda (templ)
  60                                   (overlay-get templ 'company-template-fields))
  61                                 templates))))
  62     (dolist (pos (mapcar 'overlay-start fields))
  63       (and pos
  64            (> pos (point))
  65            (< pos minimum)
  66            (setq minimum pos)))
  67     (push-mark)
  68     (goto-char minimum)))
  69
  70 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  71
  72 (defvar company-template--buffer-templates nil)
  73 (make-variable-buffer-local 'company-template--buffer-templates)
  74
  75 (defun company-template-declare-template (beg end)
  76   (let ((ov (make-overlay beg end)))
  77     ;; (overlay-put ov 'face 'highlight)
  78     (overlay-put ov 'keymap company-template-nav-map)
  79     (overlay-put ov 'evaporate t)
  80     (push ov company-template--buffer-templates)
  81     (add-hook 'post-command-hook 'company-template-post-command nil t)
  82     ov))
  83
  84 (defun company-template-remove-template (templ)
  85   (mapc 'company-template-remove-field
  86         (overlay-get templ 'company-template-fields))
  87   (setq company-template--buffer-templates
  88         (delq templ company-template--buffer-templates))
  89   (delete-overlay templ))
  90
  91 (defun company-template-add-field (templ pos text)
  92   (assert templ)
  93   (save-excursion
  94     ;; (goto-char pos)
  95     (let ((ov (make-overlay pos pos))
  96           (siblings (overlay-get templ 'company-template-fields))
  97           (label (propertize text 'face 'company-template-field
  98                              'company-template-parent templ)))
  99       (overlay-put ov 'face 'highlight)
 100       (add-text-properties 0 1 '(cursor t) label)
 101       (overlay-put ov 'after-string label)
 102       ;; (overlay-put ov 'evaporate t)
 103       (overlay-put ov 'intangible t)
 104       (overlay-put ov 'company-template-parent templ)
 105       (overlay-put ov 'insert-in-front-hooks '(company-template-remove))
 106       (push ov siblings)
 107       (overlay-put templ 'company-template-fields siblings))))
 108
 109 (defun company-template-remove-field (field)
 110   (when (overlayp field)
 111     ;; (delete-region (overlay-start field) (overlay-end field))
 112     (delete-overlay field))
 113   ;; TODO: unlink
 114   )
 115
 116 (defun company-template-clean-up (&optional pos)
 117   "Clean up all templates that don't contain POS."
 118   (unless pos (setq pos (point)))
 119   (let ((local-ovs (overlays-in (- pos 2) pos)))
 120     (dolist (templ company-template--buffer-templates)
 121       (unless (memq templ local-ovs)
 122         (company-template-remove-template templ)))))
 123
 124 ;; hooks ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 125
 126 (defun company-template-remove (overlay after-p beg end &optional r)
 127   "Called when a snippet input prompt is modified."
 128   (when after-p
 129     (delete-overlay overlay)))
 130
 131 (defun company-template-post-command ()
 132   (company-template-clean-up)
 133   (unless company-template--buffer-templates
 134     (remove-hook 'post-command-hook 'company-template-post-command t)))
 135
 136 (provide 'company-template)
 137 ;;; company-template.el ends here