improve: use index in session to avoid parsing data dir each time

index.php

@@ -18,6 +18,21 @@
 				exit;
 			}
 
+			session_start();
+
+			function savenote($title, $content)
+			{
+				global $dir;
+				file_put_contents($dir . '/' . $title, $content);
+				$key = array_search($dir . '/' . $title, $_SESSION['index']);
+				if ($key)
+				{
+					// handle the rename case
+					array_splice($_SESSION['index'], $key, 1);
+					array_unshift($_SESSION['index'], $dir . '/' . $title);
+				}
+			}
+
 			$action = '';
 
 			if (isset($_GET['open']))
@@ -61,14 +76,14 @@
 			if ($action == 'clip' && $_GET['param'])
 			{
 			 	$content = $_GET['param'] . "\r\n" . file_get_contents($dir . '/todo');
-				file_put_contents($dir . '/todo', $content);
+				savenote('todo', $content);
 				$_GET['param'] = '';
 			}
 			if ($action == 'save')
 			{
 				$title = $_POST['title'];
 				$content = $_POST['content'];
-				file_put_contents($dir . '/' . $title, $content);
+				savenote($title, $content);
 
 				$previoustitle = $_POST['previoustitle'];
 				if ($title != $previoustitle)
@@ -76,18 +91,21 @@
 					rename($dir . '/' . $previoustitle, $dir . '/' . $previoustitle . '.del');
 				}
 
-				$action = 'open';
-				$_GET['param'] = $title;
-
 				if (isset($_POST['home']))
 				{
-					header('Location: index.php');
+					$action = '';
+				}
+				else
+				{
+					$action = 'open';
+					$_GET['param'] = $title;
 				}
 			}
 			else if ($action == 'delete')
 			{
 				$title = $_POST['title'];
 				rename($dir . '/' . $title, $dir . '/' . $title . '.del');
+				// reindex!
 			}
 
 			if ($action == 'preview')
@@ -116,7 +134,7 @@
 				if (!file_exists($dir . '/' . $title))
 				{
 					$content = "---\r\ndate: " . substr($now, 0, 10) . "\r\ntags: \r\n---\r\n";
-					file_put_contents($dir . '/' . $title, $content);
+					savenote($title, $content);
 				}
 				else if (!$content)
 				{
@@ -165,14 +183,19 @@
 				}
 				require('home.php');
 
-				echo '<div class="editor">';
+				echo '<div>';
+
+				if (!isset($_SESSION['index']) || isset($_GET['reindex']))
+				{
 					$files = glob($dir . '/*');
 					usort($files, function($a, $b)
 					{
 						return filemtime($b) - filemtime($a);
 					});
+					$_SESSION['index'] = $files;
+				}
 
-				foreach($files as $path)
+				foreach($_SESSION['index'] as $path)
 				{
 					$tags = '';
 					$name = basename($path);