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#!/usr/bin/env php
<?php
/**
 * @copyright Copyright (c) 2014 Carsten Brandt
 * @license https://github.com/cebe/markdown/blob/master/LICENSE
 * @link https://github.com/cebe/markdown#readme
 */

$composerAutoload = [
	__DIR__ . '/../vendor/autoload.php', // standalone with "composer install" run
	__DIR__ . '/../../../autoload.php',  // script is installed as a composer binary
];
foreach ($composerAutoload as $autoload) {
	if (file_exists($autoload)) {
		require($autoload);
		break;
	}
}

// Send all errors to stderr
ini_set('display_errors', 'stderr');

$flavor = 'cebe\\markdown\\Markdown';
$flavors = [
	'gfm'   => ['cebe\\markdown\\GithubMarkdown', __DIR__ . '/../GithubMarkdown.php'],
	'extra' => ['cebe\\markdown\\MarkdownExtra',  __DIR__ . '/../MarkdownExtra.php'],
];

$full = false;
$src = [];
foreach($argv as $k => $arg) {
	if ($k == 0) {
		continue;
	}
	if ($arg[0] == '-') {
		$arg = explode('=', $arg);
		switch($arg[0]) {
			case '--flavor':
				if (isset($arg[1])) {
					if (isset($flavors[$arg[1]])) {
						require($flavors[$arg[1]][1]);
						$flavor = $flavors[$arg[1]][0];
					} else {
						error("Unknown flavor: " . $arg[1], "usage");
					}
				} else {
					error("Incomplete argument --flavor!", "usage");
				}
			break;
			case '--full':
				$full = true;
			break;
			case '-h':
			case '--help':
				echo "PHP Markdown to HTML converter\n";
				echo "------------------------------\n\n";
				echo "by Carsten Brandt <mail@cebe.cc>\n\n";
				usage();
			break;
			default:
				error("Unknown argument " . $arg[0], "usage");
		}
	} else {
		$src[] = $arg;
	}
}

if (empty($src)) {
	$markdown = file_get_contents("php://stdin");
} elseif (count($src) == 1) {
	$file = reset($src);
	if (!file_exists($file)) {
		error("File does not exist:" . $file);
	}
	$markdown = file_get_contents($file);
} else {
	error("Converting multiple files is not yet supported.", "usage");
}

/** @var cebe\markdown\Parser $md */
$md = new $flavor();
$markup = $md->parse($markdown);

if ($full) {
	echo <<<HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
	"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
	<meta http-equiv="content-type" content="text/html; charset=utf-8">
	<style>
		body { font-family: Arial, sans-serif; }
		code { background: #eeeeff; padding: 2px; }
		li { margin-bottom: 5px; }
		img { max-width: 1200px; }
		table, td, th { border: solid 1px #ccc; border-collapse: collapse; }
	</style>
</head>
<body>
$markup
</body>
</html>
HTML;
} else {
	echo $markup;
}

// functions

/**
 * Display usage information
 */
function usage() {
	global $argv;
	$cmd = $argv[0];
	echo <<<EOF
Usage:
    $cmd [--flavor=<flavor>] [--full] [file.md]

--flavor  specifies the markdown flavor to use. If omitted the original markdown by John Gruber [1] will be used.
              Available flavors:

gfm   - Github flavored markdown [2]
              extra - Markdown Extra [3]

--full    ouput a full HTML page with head and body. If not given, only the parsed markdown will be output.

--help    shows this usage information.

If no file is specified input will be read from STDIN.

Examples:

Render a file with original markdown:

$cmd README.md > README.html

Render a file using gihtub flavored markdown:

$cmd --flavor=gfm README.md > README.html

Convert the original markdown description to html using STDIN:

curl http://daringfireball.net/projects/markdown/syntax.text | $cmd > md.html

[1] http://daringfireball.net/projects/markdown/syntax
[2] https://help.github.com/articles/github-flavored-markdown
[3] http://michelf.ca/projects/php-markdown/extra/

EOF;
	exit(1);
}

/**
 * Send custom error message to stderr
 * @param $message string
 * @param $callback mixed called before script exit
 * @return void
 */
function error($message, $callback = null) {
	$fe = fopen("php://stderr", "w");
	fwrite($fe, "Error: " . $message . "\n");

if (is_callable($callback)) {
		call_user_func($callback);
	}

exit(1);
}