testing

PhabricatorRemarkupGraphvizBlockInterpreter.php
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			<?php

			final class PhabricatorRemarkupGraphvizBlockInterpreter
			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 PhabricatorEmbedFileRemarkupRule 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;
			}
			}