Exit immediately if we're not in interactive mode and no input is pro…

…vided

Previously we'd hang out trying to get input from readline, which is very much not what you'd expect if you explicitly asked for `--no-interaction` :)

See laravel/tinker#98

src/Shell.php

@@ -399,7 +399,13 @@ private function doNonInteractiveRun($rawOutput)
 
         $this->beforeRun();
         $this->loadIncludes();
-        $this->getInput(false);
+
+        // For non-interactive execution, read only from the input buffer or from piped input.
+        // Otherwise it'll try to readline and hang, waiting for user input with no indication of
+        // what's holding things up.
+        if (!empty($this->inputBuffer) || $this->config->inputIsPiped()) {
+            $this->getInput(false);
+        }
 
         if ($this->hasCode()) {
             $ret = $this->execute($this->flushCode());