Reintroduce trim expander + handle node path relative to cwd

Author: assertchris

composer.json

@@ -7,6 +7,7 @@
             "Pre\\Plugin\\": "source"
         },
         "files": [
+            "source/expanders.php",
             "source/functions.php",
             "source/autoload.php",
             "source/macros.php"

source/Parser.php

@@ -178,7 +178,10 @@ public function format($code)
             })
         '";
 
+        $cwd = getcwd();
+        chdir(__DIR__);
         exec($command, $output);
+        chdir($cwd);
 
         if (!$output) {
             return $code;

source/expanders.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Yay\DSL\Expanders {
+    use Yay\Engine;
+    use Yay\TokenStream;
+
+    function trim(TokenStream $stream, Engine $engine): TokenStream {
+        return \Pre\Plugin\Expanders\trim($stream, $engine);
+    }
+}
+
+namespace Pre\Plugin\Expanders {
+    use Yay\Engine;
+    use Yay\TokenStream;
+
+    function _stream(string $source, Engine $engine): TokenStream {
+        return TokenStream::fromSource(
+            $engine->expand($source, "", Engine::GC_ENGINE_DISABLED)
+        );
+    }
+
+    function trim(TokenStream $stream, Engine $engine): TokenStream {
+        $stream = \trim($stream);
+        return _stream($stream, $engine);
+    }
+}