Added method to check for changes by file rather than by folder, made it default option as its safest

system/config/system.yaml

@@ -22,7 +22,7 @@ pages:
 cache:
   enabled: true                        # Set to true to enable caching
   check:
-    pages: true                        # Check to see if page has been modifying to flush the cache
+    method: page                       # Method to check for updates in pages: page|folder|none
   driver: auto                         # One of: auto|file|apc|xcache|memcache|memcached|wincache
   prefix: 'g'                          # Cache prefix string (prevents cache conflicts)
 

system/src/Grav/Common/Filesystem/Folder.php

@@ -15,13 +15,13 @@ abstract class Folder
      * @param string $path
      * @return int
      */
-    public static function lastModified($path)
+    public static function lastModifiedFolder($path)
     {
+        $last_modified = 0;
+
         $directory = new \RecursiveDirectoryIterator($path, \RecursiveDirectoryIterator::SKIP_DOTS);
         $iterator = new \RecursiveIteratorIterator($directory, \RecursiveIteratorIterator::SELF_FIRST);
 
-        $last_modified = 0;
-
         /** @var \RecursiveDirectoryIterator $file */
         foreach ($iterator as $file) {
             $dir_modified = $file->getMTime();
@@ -32,6 +32,35 @@ abstract class Folder
         return $last_modified;
     }
 
+    /**
+     * Recursively find the last modified time under given path by file.
+     *
+     * @param string $path
+     * @return int
+     */
+    public static function lastModifiedFile($path)
+    {
+        $last_modified = 0;
+
+        $dirItr    = new \RecursiveDirectoryIterator($path);
+        $filterItr = new GravRecursiveFilterIterator($dirItr);
+        $itr       = new \RecursiveIteratorIterator($filterItr, \RecursiveIteratorIterator::SELF_FIRST);
+
+        /** @var \RecursiveDirectoryIterator $file */
+        foreach ($itr as $file) {
+
+            if (!$file->isDir()) {
+
+                $dir_modified = $file->getMTime();
+                if ($dir_modified > $last_modified) {
+                    $last_modified = $dir_modified;
+                }
+            }
+
+        }
+    }
+
+
     /**
      * Return recursive list of all files and directories under given path.
      *
@@ -219,3 +248,19 @@ abstract class Folder
         }
     }
 }
+
+class GravRecursiveFilterIterator extends \RecursiveFilterIterator {
+
+    public static $FILTERS = array(
+        '.', '..', '.DS_Store'
+    );
+
+    public function accept() {
+        return !in_array(
+            $this->current()->getFilename(),
+            self::$FILTERS,
+            true
+        );
+    }
+
+}

system/src/Grav/Common/Page/Pages.php

@@ -356,8 +356,19 @@ class Pages
             $cache = $this->grav['cache'];
             /** @var Taxonomy $taxonomy */
             $taxonomy = $this->grav['taxonomy'];
-            $last_modified = $config->get('system.cache.check.pages', true)
-                ? Folder::lastModified(PAGES_DIR) : 0;
+
+            // how should we check for last modified? Default is by page
+            switch ($config->get('system.cache.check.method', 'page')) {
+                case 'page':
+                    $last_modified = Folder::lastModifiedFile(PAGES_DIR);
+                    break;
+                case 'folder':
+                    $last_modified = Folder::lastModifiedFolder(PAGES_DIR);
+                    break;
+                default:
+                    $last_modified = 0;
+            }
+
             $page_cache_id = md5(USER_DIR.$last_modified);
 
             list($this->instances, $this->routes, $this->children, $taxonomy_map, $this->sort) = $cache->fetch($page_cache_id);
@@ -546,7 +557,7 @@ class Pages
             // else just sort the list according to specified key
             asort($list);
         }
-        
+
 
         // Move manually ordered items into the beginning of the list. Order of the unlisted items does not change.
         if (is_array($manual) && !empty($manual)) {

user/config/system.yaml

@@ -11,7 +11,7 @@ pages:
 cache:
   enabled: true
   check:
-    pages: true
+    method: page
   driver: auto
   prefix: 'g'
 

user/pages/02.test/default.md

@@ -0,0 +1,5 @@
+---
+title: Test
+---
+
+# Testing