Add better warning for missing factories

Author: sagikazarmark

composer.json

@@ -19,15 +19,15 @@
         "php-http/message-factory": "^1.0"
     },
     "require-dev": {
-        "php-http/utils": "dev-factories",
+        "php-http/utils": "^0.2",
         "zendframework/zend-diactoros": "^1.0",
         "guzzlehttp/psr7": "^1.0",
         "php-http/guzzle6-adapter": "^0.2",
         "phpspec/phpspec": "^2.4",
         "henrikbjorn/phpspec-code-coverage" : "^1.0"
     },
     "suggest": {
-        "php-http/utils": "To use Message Factories"
+        "php-http/utils": "To use Guzzle or Diactoros factories"
     },
     "autoload": {
         "psr-4": {

spec/MessageFactoryDiscoverySpec.php

@@ -16,6 +16,11 @@ function it_is_a_class_discovery()
         $this->shouldHaveType('Http\Discovery\ClassDiscovery');
     }
 
+    function it_is_a_factory_discovery()
+    {
+        $this->shouldHaveType('Http\Discovery\FactoryDiscovery');
+    }
+
     function it_finds_an_http_message_factory()
     {
         $this->find()->shouldHaveType('Http\Message\MessageFactory');

spec/StreamFactoryDiscoverySpec.php

@@ -16,6 +16,11 @@ function it_is_a_class_discovery()
         $this->shouldHaveType('Http\Discovery\ClassDiscovery');
     }
 
+    function it_is_a_factory_discovery()
+    {
+        $this->shouldHaveType('Http\Discovery\FactoryDiscovery');
+    }
+
     function it_finds_an_http_stream_factory()
     {
         $this->find()->shouldHaveType('Http\Message\StreamFactory');

spec/UriFactoryDiscoverySpec.php

@@ -16,6 +16,11 @@ function it_is_a_class_discovery()
         $this->shouldHaveType('Http\Discovery\ClassDiscovery');
     }
 
+    function it_is_a_factory_discovery()
+    {
+        $this->shouldHaveType('Http\Discovery\FactoryDiscovery');
+    }
+
     function it_finds_an_http_uri_factory()
     {
         $this->find()->shouldHaveType('Http\Message\UriFactory');

src/FactoryDiscovery.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Http\Discovery;
+
+/**
+ * Finds a Factory.
+ *
+ * @author Márk Sági-Kazár <[email protected]>
+ */
+abstract class FactoryDiscovery extends ClassDiscovery
+{
+    /**
+     * {@inheritdoc}
+     */
+    public static function find()
+    {
+        try {
+            return parent::find();
+        } catch (NotFoundException $e) {
+            throw new NotFoundException(
+                'No factories found. Install php-http/utils >= 0.2 to use Guzzle or Diactoros factories.',
+                0,
+                $e
+            );
+        }
+    }
+}

src/MessageFactoryDiscovery.php

@@ -9,7 +9,7 @@
  *
  * @author Márk Sági-Kazár <[email protected]>
  */
-final class MessageFactoryDiscovery extends ClassDiscovery
+final class MessageFactoryDiscovery extends FactoryDiscovery
 {
     /**
      * @var MessageFactory

src/StreamFactoryDiscovery.php

@@ -9,7 +9,7 @@
  *
  * @author Михаил Красильников <[email protected]>
  */
-final class StreamFactoryDiscovery extends ClassDiscovery
+final class StreamFactoryDiscovery extends FactoryDiscovery
 {
     /**
      * @var StreamFactory

src/UriFactoryDiscovery.php

@@ -9,7 +9,7 @@
  *
  * @author David de Boer <[email protected]>
  */
-final class UriFactoryDiscovery extends ClassDiscovery
+final class UriFactoryDiscovery extends FactoryDiscovery
 {
     /**
      * @var UriFactory