PhabricatorRemarkupBlockInterpreterCowsay.php
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	<?php

	final class PhabricatorRemarkupBlockInterpreterCowsay
	extends PhutilRemarkupBlockInterpreter {

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

	public function markupContent($content, array $argv) {
	if (!Filesystem::binaryExists('cowsay')) {
	return $this->markupError(
	pht('Unable to locate the `cowsay` binary. Install cowsay.'));
	}

	$bin = idx($argv, 'think') ? 'cowthink' : 'cowsay';
	$eyes = idx($argv, 'eyes', 'oo');
	$tongue = idx($argv, 'tongue', ' ');
	$cow = idx($argv, 'cow', 'default');

	// NOTE: Strip this aggressively to prevent nonsense like
	// `cow=/etc/passwd`. We could build a whiltelist with `cowsay -l`.
	$cow = preg_replace('/[^a-z.-]+/', '', $cow);

	$future = new ExecFuture(
	'%s -e %s -T %s -f %s ',
	$bin,
	$eyes,
	$tongue,
	$cow);

	$future->write($content);

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

	if ($err) {
	return $this->markupError(
	pht(
	'Execution of `cowsay` failed:', $stderr));
	}


	if ($this->getEngine()->isTextMode()) {
	return $stdout;
	}

	return phutil_tag(
	'div',
	array(
	'class' => 'PhabricatorMonospaced remarkup-cowsay',
	),
	$stdout);
	}

	}