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