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PhabricatorConfigRemarkupRule.php
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			<?php

			final class PhabricatorConfigRemarkupRule
			extends PhutilRemarkupRule {

			public function apply($text) {
			return preg_replace_callback(
			'(@{config:([^}]+)})',
			array($this, 'markupConfig'),
			$text);
			}

			public function getPriority() {
			// We're reusing the Diviner atom syntax, so make sure we evaluate before
			// the Diviner rule evaluates.
			return id(new DivinerSymbolRemarkupRule())->getPriority() - 1;
			}

			public function markupConfig(array $matches) {
			if (!$this->isFlatText($matches[0])) {
			return $matches[0];
			}

			$config_key = $matches[1];

			try {
			$option = PhabricatorEnv::getEnvConfig($config_key);
			} catch (Exception $ex) {
			return $matches[0];
			}

			$is_text = $this->getEngine()->isTextMode();
			$is_html_mail = $this->getEngine()->isHTMLMailMode();

			if ($is_text \|\| $is_html_mail) {
			return pht('"%s"', $config_key);
			}

			$link = phutil_tag(
			'a',
			array(
			'href' => urisprintf('/config/edit/%s/', $config_key),
			'target' => '_blank',
			),
			$config_key);

			return $this->getEngine()->storeText($link);
			}

			}