Add text/html to output bundle

- Applies to `echo` results, or any message with message option `OUTPUT_RAW`
- fixes Coder-Spirit#24
a

Author: BenRussert

src/Actions/ExecuteAction.php

@@ -57,6 +57,7 @@ public function __construct(
         $this->shellSoul = $shellSoul;
     }
 
+    /** Sends execution requests to the kernel? */
     public function call(array $header, array $content, $zmqIds = [])
     {
         $this->broker->send($this->iopubSocket, 'status', ['execution_state' => 'busy'], $header);
@@ -90,12 +91,18 @@ public function call(array $header, array $content, $zmqIds = [])
         $this->broker->send($this->iopubSocket, 'status', ['execution_state' => 'idle'], $this->header);
     }
 
-    public function notifyMessage(string $message)
+    public function notifyMessage(string $message, bool $isRaw)
     {
+        $bundle = ['text/plain' => $message];
+        if ($isRaw) {
+            // Send over raw results as html. Tags should render and plain text will still look fine.
+            $bundle['text/html'] = $message;
+        }
+
         $this->broker->send(
             $this->iopubSocket,
             'execute_result',
-            ['execution_count' => $this->execCount, 'data' => ['text/plain' => $message], 'metadata' => new \stdClass],
+            ['execution_count' => $this->execCount, 'data' => $bundle, 'metadata' => new \stdClass],
             $this->header
         );
     }

src/KernelOutput.php

@@ -55,6 +55,7 @@ public function __construct(ExecuteAction $executeAction, LoggerInterface $logge
     public function write($messages, $newline = false, $options = self::OUTPUT_NORMAL)
     {
         $types = self::OUTPUT_NORMAL | self::OUTPUT_RAW | self::OUTPUT_PLAIN;
+        // if $options is 0 or falsy then use OUTPUT_NORMAL as default...
         $type = $types & $options ?: self::OUTPUT_NORMAL;
 
         if (\is_string($messages)) {
@@ -79,7 +80,8 @@ public function write($messages, $newline = false, $options = self::OUTPUT_NORMA
             return; // TODO: Throw an error?
         }
 
-        $this->executeAction->notifyMessage($preparedMessage);
+        $isRaw = $type == self::OUTPUT_RAW ?: false;
+        $this->executeAction->notifyMessage($preparedMessage, $isRaw);
     }
 
     /**