Added IMDB plugin

Author: PeeHaa

Diff for: cli/run.php

@@ -15,6 +15,7 @@
 use Room11\Jeeves\Chat\Plugin\Wikipedia as WikipediaPlugin;
 use Room11\Jeeves\Chat\Plugin\SwordFight as SwordFightPlugin;
 use Room11\Jeeves\Chat\Plugin\Docs as DocsPlugin;
+use Room11\Jeeves\Chat\Plugin\Imdb as ImdbPlugin;
 
 use Room11\Jeeves\Chat\Client\Xhr as ChatClient;
 
@@ -41,6 +42,7 @@
     ->register(new WikipediaPlugin($chatClient))
     ->register(new SwordFightPlugin($chatClient))
     ->register(new DocsPlugin($chatClient))
+    ->register(new ImdbPlugin($chatClient))
 ;
 
 $webSocketUrl = $openIdClient->getWebSocketUri($roomId);

Diff for: src/Chat/Plugin/Imdb.php

@@ -0,0 +1,69 @@
+<?php declare(strict_types=1);
+
+namespace Room11\Jeeves\Chat\Plugin;
+
+use Room11\Jeeves\Chat\Client\Xhr as ChatClient;
+use Room11\Jeeves\Chat\Command\Message;
+use Amp\Artax\Response;
+
+class Imdb implements Plugin
+{
+    const COMMAND = 'imdb';
+
+    private $chatClient;
+
+    public function __construct(ChatClient $chatClient)
+    {
+        $this->chatClient = $chatClient;
+    }
+
+    public function handle(Message $message): \Generator
+    {
+        if (!$this->validMessage($message)) {
+            return;
+        }
+
+        yield from $this->getResult($message);
+    }
+
+    private function validMessage(Message $message): bool
+    {
+        return get_class($message) === 'Room11\Jeeves\Chat\Command\Command'
+            && $message->getCommand() === self::COMMAND
+            && $message->getParameters();
+    }
+
+    private function getResult(Message $message): \Generator
+    {
+        $response = yield from $this->chatClient->request(
+            'http://www.imdb.com/xml/find?xml=1&nr=1&tt=on&q=' . rawurlencode(implode(' ', $message->getParameters()))
+        );
+
+        yield from $this->chatClient->postMessage(
+            $this->getMessage($response)
+        );
+    }
+
+    private function getMessage(Response $response): string
+    {
+        $internalErrors = libxml_use_internal_errors(true);
+
+        $dom = new \DOMDocument();
+        $dom->loadHTML($response->getBody());
+
+        libxml_use_internal_errors($internalErrors);
+
+        if ($dom->getElementsByTagName('resultset')->length === 0) {
+            return 'I cannot find that title.';
+        }
+
+        $result = $dom->getElementsByTagName('imdbentity')->item(0);
+
+        return sprintf(
+            '[ [%s](%s) ] %s',
+            $result->firstChild->wholeText,
+            'http://www.imdb.com/title/' . $result->getAttribute('id'),
+            $result->getElementsByTagName('description')->item(0)->textContent
+        );
+    }
+}