<?php
set_include_path('/zg/chonoles/public_html/site/php');
include('defaults.php');

$main_css = false;
$pygments_css = true;
$no_robots = true;

$page_id = "viewcode";
$page_title = "View Source Code";
$page_description = "View the source code behind my website.";
$page_keywords = "view code";

include('begin.php');

//----------------------------//
//  WHAT CODE SHOULD WE GET?  //
//----------------------------//

$page = $_GET['page'];
$lang = $_GET['lang'];
$location = '';

// Allowed pages
$is_allowed_page = true;
switch($page)
{
  case 'home':                $append = '/';                              break;
  case 'research':            $append = '/research/';                     break;
  case 'teaching':            $append = '/teaching/';                     break;
  case 'expository-notes':    $append = '/expository-notes/';             break;
  case 'links':               $append = '/links/';                        break;
  case 'miscellany':          $append = '/miscellany/';                   break;
  case 'quotations':          $append = '/miscellany/quotations/';        break;
  case 'jokes':               $append = '/miscellany/jokes/';             break;
  case 'making-a-website':    $append = '/miscellany/making-a-website/';  break;
  default:                    $is_allowed_page = false;                   break;
}
if($is_allowed_page && $lang == 'php')  $location = '/zg/chonoles/public_html' . $append . 'index.php';
if($is_allowed_page && $lang == 'html') $location = 'http://math.uchicago.edu/~chonoles' . $append;


// Allowed PHP files
$is_allowed_php = true;
switch($page)
{
  case 'defaults':            $append = '/defaults.php';                  break;
  case 'begin':               $append = '/begin.php';                     break;
  case 'end':                 $append = '/end.php';                       break;
  case 'header':              $append = '/header.php';                    break;
  case 'footer':              $append = '/footer.php';                    break;
  case 'mathjax':             $append = '/mathjax.php';                   break;
  case 'main-css':            $append = '/main-css.php';                  break;
  case 'no-robots':           $append = '/no-robots.php';                 break;
  case 'pygments-css':        $append = '/pygments-css.php';              break;
  case 'section-begin':       $append = '/section-begin.php';             break;
  case 'section-end':         $append = '/section-end.php';               break;
  case 'subsection-begin':    $append = '/subsection-begin.php';          break;
  case 'subsection-end':      $append = '/subsection-end.php';            break;
  case 'table-row-begin':     $append = '/table-row-begin.php';           break;
  case 'table-row-end':       $append = '/table-row-end.php';             break;
  case 'course-toggle':       $append = '/course-toggle.php';             break;
  default:                    $is_allowed_php = false;                    break;
}
if($is_allowed_php && $lang == 'php') $location = '/zg/chonoles/public_html/site/php' . $append;


// Stylesheets
$is_allowed_css = true;
switch($page)
{
  case 'stylesheet':          $append = '/main.css';                      break;
  default:                    $is_allowed_css = false;                    break;
}
if($is_allowed_css && $lang == 'css') $location = '/zg/chonoles/public_html/site/css' . $append;


// Stop if anything else
if($location == '') exit("oops");


//----------------------//
//  DISPLAY THAT CODE!  //
//----------------------//

//  Gets the raw contents of the relevant file.
$output = file_get_contents($location);

// Adds my local binaries to the path variable while this PHP file is being run; this PHP file
// will eventually "shell out" to execute the Python code for Pygments, part of which requires
// the file "pkg_resources.py". However this PHP-created shell doesn't know where that file is,
// which is why I'm telling it where to look here.
putenv('PATH=' . $_ENV["PATH"] . ':/zg/chonoles/.local/bin');

function pygmentize($string, $lexer)
{
    // use proc open to start pygmentize
    $descriptorspec = array (
        array("pipe", "r"), // stdin
        array("pipe", "w"), // stdout
        array("pipe", "w"), // stderr
    );  

    $proc = proc_open("pygmentize -O linenos=table,encoding='utf-8' -f html -l " . $lexer, $descriptorspec, $pipes, NULL, NULL);

    if(!is_resource($proc)) return false;  

    // now write $string to pygmentize's input
    fwrite($pipes[0], $string);
    fclose($pipes[0]);

    // the result should be available on stdout
    $result = stream_get_contents($pipes[1]);
    fclose($pipes[1]);

    // just checking the return val of the cmd
    $return_val = proc_close($proc);
    if($return_val !== 0) return false;   

    return $result;
}

// Outputs pygmentized code
switch($lang)
{
  case 'html': $lexer = 'html+php'; break;
  case 'php':  $lexer = 'html+php'; break;
  case 'css':  $lexer = 'css';      break;
}
$output = pygmentize($output, $lexer);

//  Censors my file path in PHP files
if($lang == 'php') $output = str_replace('/zg', '/CENSORED', $output);

//  Turns URLs into links (ADD CHECK FOR "<?php" IN STRING!!!)
if($lang == 'html') {
$url_regex_pattern = '/(href|src|og\:url&quot;\<\/span\> \<span class\="na"\>content|og\:image&quot;\<\/span\> \<span class\="na"\>content)=\<\/span\>\<span class\="s"\>&quot;([^#].+?)&quot;/';
}
else {
$url_regex_pattern = '/(href|src)=\<\/span\>\<span class\="s"\>&quot;(?!\<\?php)([^#][^\<]+?)&quot;/';
}
$output = preg_replace($url_regex_pattern, "$1=</span><span class=\"s\">&quot;<a href=\"$2\">$2</a>&quot;", $output);

$fix_for_relative_urls = '/\<a target\="_blank" href\="(?!http)(?!\<\?php)([^\<]+?)"\>/';
$output = preg_replace($fix_for_relative_urls, "<a href=\"http://math.uchicago.edu/~chonoles$append$1\">", $output);

// Look at the actual code, not the Chrome Inspect Element! Noticing that HTML entities were being used was the key here
$php_includes = '/include\<\/span\>\<span class\="p"\>\(\<\/span\>\<span class\="s1"\>&#39;(.+?)\.php&#39;/';
$output = preg_replace($php_includes, "include</span><span class=\"p\">(</span><span class=\"s1\">'<a href=\"http://math.uchicago.edu/~chonoles/viewcode/?page=$1&lang=php\">$1.php</a>'", $output);

// Turn include path into link
$output = str_replace("/CENSORED/chonoles/public_html/site/php", "<a href=\"http://math.uchicago.edu/~chonoles/site/php\">/CENSORED/chonoles/public_html/site/php</a>", $output);

// html5shiv
$output = str_replace("http://math.uchicago.edu/~chonoles/site/js/html5shiv-printshiv.js", "<a href=\"http://math.uchicago.edu/~chonoles/site/js/html5shiv-printshiv.js\">http://math.uchicago.edu/~chonoles/site/js/html5shiv-printshiv.js</a>", $output);

// star hack
$output = str_replace("http://math.uchicago.edu/~chonoles/site/css/star-hack.css", "<a href=\"http://math.uchicago.edu/~chonoles/site/css/star-hack.css\">http://math.uchicago.edu/~chonoles/site/css/star-hack.css</a>", $output);

// CC license in head element - using the surrounding spaces to differentiate from other uses of this URL
if($page == 'begin' || $lang == 'html') $output = str_replace(" http://creativecommons.org/licenses/by/4.0/", " <a href=\"http://creativecommons.org/licenses/by/4.0/\">http://creativecommons.org/licenses/by/4.0/</a>", $output);

// fixing code links in footer
if($page == 'footer' || $lang == 'html') $output = str_replace("&amp;amp;lang", "&amp;lang", $output);

// blank background image
if($page == 'stylesheet') $output = str_replace("url(http://math.uchicago.edu/~chonoles/site/img/blank.png)", "url(<a href=\"http://math.uchicago.edu/~chonoles/site/img/blank.png\">http://math.uchicago.edu/~chonoles/site/img/blank.png</a>)", $output);

echo $output;

include('end.php');
?>