Documentation cache uses 'Last Changed Rev' instead of 'Last Changed Date' now.

manual/new/Cache.php

@@ -6,13 +6,11 @@ class Cache
     protected $_ext;
     protected $_page;
     protected $_file; 
-    protected $_timeToLive;
 
-    public function __construct($dir, $ext, $timeToLive)
+    public function __construct($dir, $ext)
     {
         $this->_dir = $dir;
         $this->_ext = $ext;
-        $this->_timeToLive = $timeToLive;
         
         $this->_page = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
         $this->_file = $this->_dir . md5($this->_page) . '.' . $this->_ext;  
@@ -59,10 +57,10 @@ class Cache
      */    
     public function clear()
     {
-        if ($handle = opendir($this->dir)) {
+        if ($handle = opendir($this->_dir)) {
             while ($file = readdir($handle)) {
                 if ($file !== '.' && $file !== '..') {
-                    unlink($this->dir . '/' . $file);
+                    @unlink($this->_dir . '/' . $file);
                 }
             }
             closedir($handle);
@@ -72,13 +70,12 @@ class Cache
     /**
      * This method is used to check whether the cache file is valid to use.
      * 
-     * Currently it compares the modification date of the cache file to the
-     * time-to-live value.
+     * Currently it assumes that the cache file is always valid.
      * 
      * @return True, if cache file is valid; false otherwise.
      */
     protected function isValid()
     {
-        return (time() - filemtime($this->_file)) < $this->_timeToLive;
+        return true;
     }
 }
\ No newline at end of file

manual/new/index.php

@@ -11,18 +11,35 @@ require_once('Cache.php');
 
 spl_autoload_register(array('Sensei', 'autoload'));
 
-// Executes the svn info command for the current directory and parses the last
-// changed date in order to calculate the time-to-live value for cache.
-$timeToLive = 0;
+// Executes the 'svn info' command for the current directory and parses the last
+// changed revision.
+$revision = 0;
 exec('svn info .', $output);
 foreach ($output as $line) {
-    if (preg_match('/^Last Changed Date: (.*) \(.*\)$/', $line, $matches)) {
-        $timeToLive = time() - strtotime($matches[1]);
+    if (preg_match('/^Last Changed Rev: ([0-9]+)$/', $line, $matches)) {
+        $revision = $matches[1];
         break;
     }
 }
 
-$cache = new Cache('./cache/', 'cache', $timeToLive);
+$cacheDir = './cache/';
+$cacheRevFile = $cacheDir . 'revision.txt';
+$cacheRev = 0;
+
+$cache = new Cache($cacheDir, 'cache');
+
+// Checks the revision cache files were created from
+if (file_exists($cacheRevFile)) {
+    $cacheRev = (int) file_get_contents($cacheRevFile);
+}
+
+// Empties the cache directory and saves the current revision to a file, if SVN
+// revision is greater than cache revision
+if ($revision > $cacheRev) {
+     $cache->clear();
+     @file_put_contents($cacheRevFile, $revision);
+}
+
 
 if ($cache->begin()) {