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|
;;; haskell-svg.el --- SVG Rendering -*- lexical-binding: t -*-
;; Copyright (c) 2018 Federico Beffa. All rights reserved.
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
(defcustom haskell-svg-render-images nil
"Replace SVG image text with actual images."
:group 'haskell-interactive
:type 'boolean)
(defconst haskell-svg-supported (image-type-available-p 'svg)
"Defines if SVG images are supported by this instance of Emacs.")
(defun haskell-svg-render-images-p ()
"Shall we render SVG images?"
(and haskell-svg-supported (display-images-p) haskell-svg-render-images))
(defun haskell-svg-maybe-render-images (text)
"Render SVG images if desired and supported, or terurn the
input unmodified."
(if (haskell-svg-render-images-p)
(haskell-svg-render-images text)
text))
(defun haskell-svg-render-images (text)
"Replace an SVG image text with an actual image."
(with-temp-buffer
(insert text)
(goto-char (point-min))
(when (re-search-forward
"\"?<\\?xml\\(.\\|\n\\|\r\\)* PUBLIC \"-//W3C//DTD SVG [0-9]\.[0-9]//EN\\(.\\|\n\\|\r\\)*</svg>\"?"
nil t)
(let ((svg-string (match-string 0))
(begin (match-beginning 0))
(end (match-end 0)))
(delete-region begin end)
(goto-char begin)
(insert-image (create-image svg-string nil t) "SVG image")))
(buffer-substring (point-min) (point-max))))
(defun haskell-svg-toggle-render-images ()
"Toggle rendering of SVG images at the REPL output."
(interactive)
(setq haskell-svg-render-images (not haskell-svg-render-images)))
(provide 'haskell-svg)
;;; haskell-svg.el ends here
|
