implement experimental node module loader

Author: cubicap

docs/getting-started.md

@@ -11,7 +11,7 @@ For example, a Machine with some built-in MFeatures can be created like this:
 #include <jaculus/features/stdioFeature.h>
 #include <jaculus/features/filesystemFeature.h>
 #include <jaculus/features/basicStreamFeature.h>
-#include <jaculus/features/moduleLoaderFeature.h>
+#include <jaculus/features/simpleModuleLoaderFeature.h>
 #include <jaculus/features/util/ostreamjs.h>
 
 

src/jac/features/filesystemFeature.h

@@ -86,6 +86,18 @@ class FilesystemFeature : public Next {
             return buffer;
         }
 
+        bool existsCode(std::string path_) {
+            return std::filesystem::exists(_feature._codeDir / path_);
+        }
+
+        bool isFileCode(std::string path_) {
+            return std::filesystem::is_regular_file(_feature._codeDir / path_);
+        }
+
+        bool isDirectoryCode(std::string path_) {
+            return std::filesystem::is_directory(_feature._codeDir / path_);
+        }
+
 
         File open(std::string path_, std::string flags) {
             return File(_feature._workingDir / path_, flags);