PhabricatorRemarkupBlockInterpreterGraphviz.php
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	<?php

	final class PhabricatorRemarkupBlockInterpreterGraphviz
	extends PhutilRemarkupBlockInterpreter {

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

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

	$width = $this->parseDimension(idx($argv, 'width'));

	$future = id(new ExecFuture('dot -T%s', 'png'))
	->setTimeout(15)
	->write(trim($content));

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

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

	$file = PhabricatorFile::buildFromFileDataOrHash(
	$stdout,
	array(
	'name' => 'graphviz.png',
	));

	if ($this->getEngine()->isTextMode()) {
	return '<'.$file->getBestURI().'>';
	}

	return phutil_tag(
	'img',
	array(
	'src' => $file->getBestURI(),
	'width' => nonempty($width, null),
	));
	}

	// TODO: This is duplicated from PhabricatorRemarkupRuleEmbedFile since they
	// do not share a base class.
	private function parseDimension($string) {
	$string = trim($string);

	if (preg_match('/^(?:\d*\\.)?\d+%?$/', $string)) {
	return $string;
	}

	return null;
	}
	}