Add Cache class for using WordPress built-in transients in more readable way

Herbert/Framework/cache.php

@@ -0,0 +1,66 @@
+<?php namespace Herbert\Framework;
+
+use Closure;
+/*
+ * This is wrapper for WordPress transient functions
+ * It uses anonymous functions so 
+ * 
+ * For Example turn this ugly code:
+ *
+    if (false === ( $events = get_transient( 'my-events' ) ) ) {
+        $events = Event::all($start,$end);
+        set_transient( 'my-events', $result );
+    }
+
+ * Into:
+ *
+    $events = Cache::store('my-events',function() {
+        return Event::all($start,$end);
+    });
+ */
+
+class Cache {
+
+    /**
+     * Returns whatever is cached into $key.
+     * Runs $closure and stores it into $key when $closure returns non-empty response
+     *
+     * @param String $key - Key to store the result of the operation
+     *
+     * @param Closure $closure - Anonymous function which is run only when needed
+     *
+     * @return mixed - Returns the result of $closure from cache
+     */
+    public static function store($key,Closure $closure)
+    {
+        if ( self::bypassCache() || false === ( $result = get_transient( $key ) ) ) {
+          $result = $closure();
+          if (!empty($result)) {
+            set_transient( $key, $result );
+          }
+        }
+        return $result;
+    }
+
+    /**
+     * Delete something from the cache
+     *
+     * @param String $key - Key to delete the from cache
+     *
+     * @return mixed - Returns the result of $closure from cache
+     */
+    public static function delete($key)
+    {
+        return delete_transient($key);
+    }
+
+    /**
+     * Check if the request has PRAGMA header set to no-cache
+     *
+     * @return bool
+     */
+    public static function bypassCache()
+    {
+         return (isset($_SERVER['HTTP_PRAGMA']) && $_SERVER['HTTP_PRAGMA'] === 'no-cache');
+    }
+}

composer.json

@@ -3,6 +3,7 @@
   "description": "Herbert",
   "license": "MIT",
   "require": {
+    "php": ">=5.4.0",
     "twig/twig": "~1.16",
     "illuminate/database": "~5.0",
     "vierbergenlars/php-semver": "~3.0",