[Notifier] Add Notification::exception()

Author: fabpot

Notification/Notification.php

@@ -58,15 +58,7 @@ public function __construct(string $subject = '', array $channels = [])
      */
     public static function fromThrowable(\Throwable $exception, array $channels = []): self
     {
-        $parts = explode('\\', \get_class($exception));
-
-        $notification = new self(sprintf('%s: %s', array_pop($parts), $exception->getMessage()), $channels);
-        if (class_exists(FlattenException::class)) {
-            $notification->exception = $exception instanceof FlattenException ? $exception : FlattenException::createFromThrowable($exception);
-        }
-        $notification->exceptionAsString = $notification->computeExceptionAsString($exception);
-
-        return $notification;
+        return (new self('', $channels))->exception($exception);
     }
 
     /**
@@ -142,6 +134,22 @@ public function getEmoji(): string
         return $this->emoji ?: $this->getDefaultEmoji();
     }
 
+    /**
+     * @return $this
+     */
+    public function exception(\Throwable $exception): static
+    {
+        $parts = explode('\\', \get_class($exception));
+
+        $this->subject = sprintf('%s: %s', array_pop($parts), $exception->getMessage());
+        if (class_exists(FlattenException::class)) {
+            $this->exception = $exception instanceof FlattenException ? $exception : FlattenException::createFromThrowable($exception);
+        }
+        $this->exceptionAsString = $this->computeExceptionAsString($exception);
+
+        return $this;
+    }
+
     public function getException(): ?FlattenException
     {
         return $this->exception;