Fixed composer compatibility (#4)

* hash generator written in a way more compatible with all versions of composer

* removed require of composer 2.0 or greater

composer.json

@@ -23,8 +23,7 @@
     "minimum-stability": "stable",
     "require": {
         "php": ">=7.0",
-        "yiisoft/yii2": "*",
-        "composer/composer": ">=2.0"
+        "yiisoft/yii2": "*"
     },
     "autoload": {
         "psr-4": {

src/Menu.php

@@ -2,7 +2,6 @@
 
 namespace dynamikaweb\adaptive;
 
-use Composer\InstalledVersions as Composer;
 use yii\helpers\ArrayHelper;
 use yii\helpers\Inflector;
 use yii\helpers\Html;
@@ -198,9 +197,10 @@ public function renderFile($view, $params = [])
      */
     public function generateHash()
     {
-        return strtr('menu-{md5}-{version}', [
-            '{version}' => Composer::getVersion('dynamikaweb/yii2-adaptive-menu'),
-            '{md5}' => md5(json_encode($this->items)),
+        return strtr('menu-{hash_items}-{hash_assets}-{lastmod}', [
+            '{hash_assets}' => md5($this->_asset->touchTimes),
+            '{hash_items}' => md5(json_encode($this->items)),
+            '{lastmod}' => getlastmod(),
         ]);
     }
 }

src/MenuAsset.php

@@ -21,8 +21,28 @@ class MenuAsset extends \yii\web\AssetBundle
         'script.js',
     ];
 
+    /**
+     * return file exactly patch
+     *
+     * @param string $view
+     * @return string
+     */
     public function getFile($view) 
     {
         return "{$this->sourcePath}/{$this->files[$view]}"; 
     }
+
+    /**
+     * Concat asset file modified times
+     *
+     * @return string
+     */
+    public function getTouchTimes()
+    {
+        return implode('-', array_map(function($file) {
+            return filemtime($this->getFile($file));
+        },
+            array_keys($this->files)
+        ));
+    }
 }