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128 lines
3.7 KiB
PHP
128 lines
3.7 KiB
PHP
<?php
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/**
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* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
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* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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namespace OC\Preview;
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use OCP\Files\File;
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use OCP\IImage;
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class MarkDown extends TXT {
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/**
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* {@inheritDoc}
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*/
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public function getMimeType(): string {
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return '/text\/(x-)?markdown/';
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}
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public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
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$content = $file->fopen('r');
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if ($content === false) {
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return null;
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}
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$content = stream_get_contents($content, 3000);
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//don't create previews of empty text files
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if (trim($content) === '') {
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return null;
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}
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// Merge text paragraph lines that might belong together
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$content = preg_replace('/^(\s*)\*\s/mU', '$1- ', $content);
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$content = preg_replace('/((?!^(\s*-|#)).*)(\w|\\|\.)(\r\n|\n|\r)(\w|\*)/mU', '$1 $3', $content);
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// Remove markdown symbols that we cannot easily represent in rendered text in the preview
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$content = preg_replace('/\*\*(.*)\*\*/U', '$1', $content);
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$content = preg_replace('/\*(.*)\*/U', '$1', $content);
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$content = preg_replace('/\_\_(.*)\_\_/U', '$1', $content);
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$content = preg_replace('/\_(.*)\_/U', '$1', $content);
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$content = preg_replace('/\~\~(.*)\~\~/U', '$1', $content);
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$content = preg_replace('/\!?\[((.|\n)*)\]\((.*)\)/mU', '$1 ($3)', $content);
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$content = preg_replace('/\n\n+/', "\n", $content);
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$content = preg_replace('/[\x{10000}-\x{10FFFF}]/u', '', $content);
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$lines = preg_split("/\r\n|\n|\r/", $content);
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// Define text size of text file preview
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$fontSize = $maxX ? (int)((1 / ($maxX >= 512 ? 60 : 40) * $maxX)) : 10;
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$image = imagecreate($maxX, $maxY);
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imagecolorallocate($image, 255, 255, 255);
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$textColor = imagecolorallocate($image, 0, 0, 0);
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$fontFile = __DIR__ . '/../../../core/fonts/NotoSans-Regular.ttf';
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$fontFileBold = __DIR__ . '/../../../core/fonts/NotoSans-Bold.ttf';
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$canUseTTF = function_exists('imagettftext');
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$textOffset = (int)min($maxX * 0.05, $maxY * 0.05);
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$nextLineStart = 0;
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$y = $textOffset;
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foreach ($lines as $line) {
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$actualFontSize = $fontSize;
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if (mb_strpos($line, '# ') === 0) {
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$actualFontSize *= 2;
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}
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if (mb_strpos($line, '## ') === 0) {
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$actualFontSize *= 1.8;
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}
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if (mb_strpos($line, '### ') === 0) {
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$actualFontSize *= 1.6;
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}
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if (mb_strpos($line, '#### ') === 0) {
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$actualFontSize *= 1.4;
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}
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if (mb_strpos($line, '##### ') === 0) {
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$actualFontSize *= 1.2;
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}
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if (mb_strpos($line, '###### ') === 0) {
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$actualFontSize *= 1.1;
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}
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// Add spacing before headlines
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if ($actualFontSize !== $fontSize && $y !== $textOffset) {
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$y += (int)($actualFontSize * 2);
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}
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$x = $textOffset;
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$y += (int)($nextLineStart + $actualFontSize);
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if ($canUseTTF === true) {
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$wordWrap = (int)((1 / $actualFontSize * 1.3) * $maxX);
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// Get rid of markdown symbols that we still needed for the font size
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$line = preg_replace('/^#*\s/', '', $line);
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$wrappedText = wordwrap($line, $wordWrap, "\n");
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$linesWrapped = count(explode("\n", $wrappedText));
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imagettftext($image, $actualFontSize, 0, $x, $y, $textColor, $actualFontSize === $fontSize ? $fontFile : $fontFileBold, $wrappedText);
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$nextLineStart = (int)($linesWrapped * ceil($actualFontSize * 2));
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if ($actualFontSize !== $fontSize && $y !== $textOffset) {
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$nextLineStart -= $actualFontSize;
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}
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} else {
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$y -= $fontSize;
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imagestring($image, 1, $x, $y, $line, $textColor);
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$nextLineStart = $fontSize;
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}
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if ($y >= $maxY) {
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break;
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}
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}
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$imageObject = new \OCP\Image();
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$imageObject->setResource($image);
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return $imageObject->valid() ? $imageObject : null;
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}
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}
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