Do not extend EVALSHA for ScriptCommand class.

src/Command/ScriptCommand.php

@@ -11,8 +11,6 @@
 
 namespace Predis\Command;
 
-use Predis\Command\Redis\EVALSHA;
-
 /**
  * Base class used to implement an higher level abstraction for commands based
  * on Lua scripting with EVAL and EVALSHA.
@@ -21,8 +19,16 @@ use Predis\Command\Redis\EVALSHA;
  *
  * @author Daniele Alessandri <suppakilla@gmail.com>
  */
-abstract class ScriptCommand extends EVALSHA
+abstract class ScriptCommand extends Command
 {
+    /**
+     * {@inheritdoc}
+     */
+    public function getId()
+    {
+        return 'EVALSHA';
+    }
+
     /**
      * Gets the body of a Lua script.
      *
@@ -30,6 +36,16 @@ abstract class ScriptCommand extends EVALSHA
      */
     abstract public function getScript();
 
+    /**
+     * Calculates the SHA1 hash of the body of the script.
+     *
+     * @return string SHA1 hash.
+     */
+    public function getScriptHash()
+    {
+        return sha1($this->getScript());
+    }
+
     /**
      * Specifies the number of arguments that should be considered as keys.
      *
@@ -63,12 +79,14 @@ abstract class ScriptCommand extends EVALSHA
             $numkeys = count($arguments) + $numkeys;
         }
 
-        $arguments = array_merge(array(sha1($this->getScript()), (int) $numkeys), $arguments);
+        $arguments = array_merge(array($this->getScriptHash(), (int) $numkeys), $arguments);
 
         parent::setArguments($arguments);
     }
 
     /**
+     * Returns arguments for EVAL command.
+     *
      * @return array
      */
     public function getEvalArguments()
@@ -78,4 +96,14 @@ abstract class ScriptCommand extends EVALSHA
 
         return $arguments;
     }
+
+    /**
+     * Returns the equivalent EVAL command as a raw command instance.
+     *
+     * @return RawCommand
+     */
+    public function getEvalCommand()
+    {
+        return new RawCommand('EVAL', $this->getEvalArguments());
+    }
 }