friendica-addons/markdown/markdown.php

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<?php
/**
* Name: Markdown
* Description: Parse Markdown code when creating new items
* Version: 0.1
* Author: Michael Vogel <https://pirati.ca/profile/heluecht>
*/
use Friendica\App;
use Friendica\Core\Hook;
use Friendica\Content\Text\Markdown;
use Friendica\Core\Renderer;
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use Friendica\Core\Session;
use Friendica\DI;
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function markdown_install() {
Hook::register('post_local_start', __FILE__, 'markdown_post_local_start');
Hook::register('addon_settings', __FILE__, 'markdown_addon_settings');
Hook::register('addon_settings_post', __FILE__, 'markdown_addon_settings_post');
}
function markdown_addon_settings(App $a, array &$data)
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{
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if (!Session::getLocalUser()) {
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return;
}
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$enabled = intval(DI::pConfig()->get(Session::getLocalUser(), 'markdown', 'enabled'));
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$t = Renderer::getMarkupTemplate('settings.tpl', 'addon/markdown/');
$html = Renderer::replaceMacros($t, [
'$enabled' => ['enabled', DI::l10n()->t('Enable Markdown parsing'), $enabled, DI::l10n()->t('If enabled, adds Markdown support to the Compose Post form.')],
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]);
$data = [
'addon' => 'markdown',
'title' => DI::l10n()->t('Markdown Settings'),
'html' => $html,
];
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}
function markdown_addon_settings_post(App $a, array &$b)
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{
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if (!Session::getLocalUser() || empty($_POST['markdown-submit'])) {
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return;
}
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DI::pConfig()->set(Session::getLocalUser(), 'markdown', 'enabled', intval($_POST['enabled']));
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}
function markdown_post_local_start(App $a, &$request) {
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if (empty($request['body']) || !DI::pConfig()->get(Session::getLocalUser(), 'markdown', 'enabled')) {
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return;
}
// Escape elements that shouldn't be parsed
$request['body'] = \Friendica\Content\Text\BBCode::performWithEscapedTags(
$request['body'],
['code', 'noparse', 'nobb', 'pre', 'share', 'url', 'img', 'bookmark',
'audio', 'video', 'youtube', 'vimeo', 'attachment', 'iframe', 'map', 'mail'],
function ($body) {
// Escape mentions which username can contain Markdown-like characters
// See https://github.com/friendica/friendica/issues/9486
return \Friendica\Util\Strings::performWithEscapedBlocks($body, '/[@!][^@\s]+@[^\s]+\w/', function ($text) {
// Markdown accepts literal HTML but we do not in post body, so we need to escape left chevrons
// (right chevrons are used for quoting in Markdown)
// See https://github.com/friendica/friendica/issues/10634
$text = strtr($text, ['<' => '&lt;']);
return Markdown::toBBCode($text);
});
}
);
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}