<?php // Use the Markdown function from // http://www.michelf.com/projects/php-markdown/ // for Wiki-like text markup require_once 'markdown.php'; // The directory where the Wiki pages will be stored // Make sure the web server user can write to it define('PAGEDIR',dirname(__FILE__) . '/pages'); // Get page name, or use default $page = isset($_GET['page']) ? $_GET['page'] : 'Home'; // Figure out what to do: display an edit form, save an // edit form, or display a page // Display an edit form that's been asked for if (isset($_GET['edit'])) { pageHeader($page); edit($page); pageFooter($page, false); } // Save a submitted edit form else if (isset($_POST['edit'])) { file_put_contents(pageToFile($_POST['page']), $_POST['contents']); // Redirect to the regular view of the just-edited page header('Location: http://'.$_SERVER['HTTP_HOST'] . $_SERVER['SCRIPT_NAME'] . '?page='.urlencode($_POST['page'])); exit(); } // Display a page else { pageHeader($page); // If the page exists, display it and the footer with an "Edit" link if (is_readable(pageToFile($page))) { // Get the contents of the page from the file it's saved in $text = file_get_contents(pageToFile($page)); // Convert Markdown syntax (using Markdown() from markdown.php) $text = Markdown($text); // Make bare [links] link to other wiki pages $text = wikiLinks($text); // Display the page echo $text; // Display the footer pageFooter($page, true); } // If the page doesn't exist, display an edit form // and the footer without an "Edit" link else { edit($page, true); pageFooter($page, false); } } // The page header -- pretty simple, just the title and the usual HTML // pleasantries function pageheader($page) { ?> <html> <head> <title>Wiki: <?php echo htmlentities($page) ?></title> </head> <body> <h1><?php echo htmlentities($page) ?></h1> <hr/> <?php } // The page footer -- a "last modified" timestamp, an optional // "Edit" link, and a link back to the front page of the Wiki function pageFooter($page, $displayEditLink) { $timestamp = @filemtime(pageToFile($page)); if ($timestamp) { $lastModified = strftime('%c', $timestamp); } else { $lastModified = 'Never'; } if ($displayEditLink) { $editLink = ' - <a href="?page='.urlencode($page).'&edit=true">Edit</a>'; } else { $editLink = ''; } ?> <hr/> <em>Last Modified: <?php echo $lastModified ?></em> <?php echo $editLink ?> - <a href="<?php echo $_SERVER['SCRIPT_NAME'] ?>">Home</a> </body> </html> <?php } // Display an edit form. If the page already exists, include its current // contents in the form function edit($page, $isNew = false) { if ($isNew) { $contents = ''; ?> <p><b>This page doesn't exist yet.</b> To create it, enter its contents below and click the <b>Save</b> button.</p> <?php } else { $contents = file_get_contents(pageToFile($page)); } ?> <form method='post' action='<?php echo htmlentities($_SERVER['SCRIPT_NAME']) ?>'> <input type='hidden' name='edit' value='true'/> <input type='hidden' name='page' value='<?php echo htmlentities($page) ?>'/> <textarea name='contents' rows='20' cols='60'> <?php echo htmlentities($contents) ?></textarea> <br/> <input type='submit' value='Save'/> </form> <?php } // Convert a submitted page to a filename. Using md5() prevents naughty // characters in $page from causing security problems function pageToFile($page) { return PAGEDIR.'/'.md5($page); } // Turn text such as [something] in a page into an HTML link to the // Wiki page "something" function wikiLinks($page) { if (preg_match_all('/\[([^\]]+?)\]/', $page, $matches, PREG_SET_ORDER)) { foreach ($matches as $match) { $page = str_replace($match[0], '<a href="'.$_SERVER['SCRIPT_NAME']. '?page='.urlencode($match[1]).'">'.htmlentities($match[1]).'</a>', $page); } } return $page; } ?>
|
