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 [tab] 'company-template-forward-field)
  35     keymap))
  36
  37 ;; interactive ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  38
  39 (defun company-template-templates-at (pos)
  40   (let (os)
  41     (dolist (o (overlays-at pos))
  42       ;; FIXME: Always return the whole list of templates?
  43       ;; We remove templates not at point after every command.
  44       (when (memq o company-template--buffer-templates)
  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* ((start (point))
  57          (templates (company-template-templates-at (point)))
  58          (minimum (apply 'max (mapcar 'overlay-end templates)))
  59          (fields (loop for templ in templates
  60                        append (overlay-get templ 'company-template-fields))))
  61     (dolist (pos (mapcar 'overlay-start fields))
  62       (and pos
  63            (> pos (point))
  64            (< pos minimum)
  65            (setq minimum pos)))
  66     (push-mark)
  67     (goto-char minimum)
  68     (let ((field (loop for ovl in (overlays-at start)
  69                        when (overlay-get ovl 'company-template-parent)
  70                        return ovl)))
  71       (company-template-remove-field field))))
  72
  73 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  74
  75 (defvar company-template--buffer-templates nil)
  76 (make-variable-buffer-local 'company-template--buffer-templates)
  77
  78 (defun company-template-declare-template (beg end)
  79   (let ((ov (make-overlay beg end)))
  80     ;; (overlay-put ov 'face 'highlight)
  81     (overlay-put ov 'keymap company-template-nav-map)
  82     (overlay-put ov 'priority 101)
  83     (overlay-put ov 'evaporate t)
  84     (push ov company-template--buffer-templates)
  85     (add-hook 'post-command-hook 'company-template-post-command nil t)
  86     ov))
  87
  88 (defun company-template-remove-template (templ)
  89   (mapc 'company-template-remove-field
  90         (overlay-get templ 'company-template-fields))
  91   (setq company-template--buffer-templates
  92         (delq templ company-template--buffer-templates))
  93   (delete-overlay templ))
  94
  95 (defun company-template-add-field (templ pos text)
  96   (assert templ)
  97   (save-excursion
  98     (save-excursion
  99       (goto-char pos)
 100       (insert text)
 101       (when (> (point) (overlay-end templ))
 102         (move-overlay templ (overlay-start templ) (point))))
 103     (let ((ov (make-overlay pos (+ pos (length text))))
 104           (siblings (overlay-get templ 'company-template-fields)))
 105       ;; (overlay-put ov 'evaporate t)
 106       (overlay-put ov 'intangible t)
 107       (overlay-put ov 'face 'company-template-field)
 108       (overlay-put ov 'company-template-parent templ)
 109       (overlay-put ov 'insert-in-front-hooks '(company-template-insert-hook))
 110       (push ov siblings)
 111       (overlay-put templ 'company-template-fields siblings))))
 112
 113 (defun company-template-remove-field (ovl &optional clear)
 114   (when (overlayp ovl)
 115     (when (overlay-buffer ovl)
 116       (when clear
 117         (delete-region (overlay-start ovl) (overlay-end ovl)))
 118       (delete-overlay ovl))
 119     (let* ((templ (overlay-get ovl 'company-template-parent))
 120            (siblings (overlay-get templ 'company-template-fields)))
 121       (setq siblings (delq ovl siblings))
 122       (overlay-put templ 'company-template-fields siblings))))
 123
 124 (defun company-template-clean-up (&optional pos)
 125   "Clean up all templates that don't contain POS."
 126   (let ((local-ovs (overlays-at (or pos (point)))))
 127     (dolist (templ company-template--buffer-templates)
 128       (unless (memq templ local-ovs)
 129         (company-template-remove-template templ)))))
 130
 131 ;; hooks ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 132
 133 (defun company-template-insert-hook (ovl after-p &rest ignore)
 134   "Called when a snippet input prompt is modified."
 135   (unless after-p
 136     (company-template-remove-field ovl t)))
 137
 138 (defun company-template-post-command ()
 139   (company-template-clean-up)
 140   (unless company-template--buffer-templates
 141     (remove-hook 'post-command-hook 'company-template-post-command t)))
 142
 143 (provide 'company-template)
 144 ;;; company-template.el ends here