PhabricatorRemarkupKaTeXBlockInterpreter.php
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	<?php

	final class PhabricatorRemarkupKaTeXBlockInterpreter
	extends PhutilRemarkupBlockInterpreter {

	public function getInterpreterName() {
	return 'katex';
	}

	public function markupContent($content, array $argv) {
	$future = id(new ExecFuture('node /opt/render2katex/index.js d'))
	->setTimeout(15)
	->write(trim($content));

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

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

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

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

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

	return phutil_safe_html($result);
	}

	}