katexinline.php
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	<?php

	final class PhabricatorInlineKaTeXRemarkupRule extends PhabricatorRemarkupCustomInlineRule {

	public function getPriority() {
	return 300.0;
	}

	public function apply($text) {
	return preg_replace_callback(
	'@{tex\b([^{}]({[^{}]?([^{}]\|(?R))[^{}]?}[^{}])[^{}]*)}@m',
	array($this, 'markupNavigation'),
	$text);
	}

	public function markupNavigation(array $matches) {

	$future = id(new ExecFuture('node /opt/render2katex/index.js i'))
	->setTimeout(15)
	->write(trim($matches[1]));

	list($err, $stdout, $stderr) = $future->resolve();

	if ($err) {
	return
	pht(
	'Execution of `%s` failed (#%d), check your syntax: %s',
	'render2katex',
	$err,
	$stderr);
	}

	$result = $stdout;
	$engine = $this->getEngine();

	if ($engine->isTextMode()) {
	return $matches[1];
	}

	if ($engine->isHTMLMailMode()) {
	return phutil_safe_html($result);
	}

	return $this->getEngine()->storeText(phutil_safe_html($result));
	}
	}