Start work on intransient plugins

src/openrct2/scripting/Plugin.cpp

@@ -23,7 +23,7 @@
 
 using namespace OpenRCT2::Scripting;
 
-Plugin::Plugin(duk_context* context, const std::string& path)
+Plugin::Plugin(duk_context* context, std::string_view path)
     : _context(context)
     , _path(path)
 {
@@ -73,10 +73,16 @@ void Plugin::Load()
     }
 
     _metadata = GetMetadata(DukValue::take_from_stack(_context));
+    _hasLoaded = true;
 }
 
 void Plugin::Start()
 {
+    if (!_hasLoaded)
+    {
+        throw std::runtime_error("Plugin has not been loaded.");
+    }
+
     const auto& mainFunc = _metadata.Main;
     if (mainFunc.context() == nullptr)
     {
@@ -115,6 +121,12 @@ void Plugin::ThrowIfStopping() const
     }
 }
 
+void Plugin::Unload()
+{
+    _metadata.Main = {};
+    _hasLoaded = false;
+}
+
 void Plugin::LoadCodeFromFile()
 {
     _code = File::ReadAllText(_path);
@@ -174,6 +186,8 @@ PluginType Plugin::ParsePluginType(std::string_view type)
         return PluginType::Local;
     if (type == "remote")
         return PluginType::Remote;
+    if (type == "intransient")
+        return PluginType::Intransient;
     throw std::invalid_argument("Unknown plugin type.");
 }
 
@@ -192,4 +206,9 @@ int32_t Plugin::GetTargetAPIVersion() const
     return 33;
 }
 
+bool Plugin::IsTransient() const
+{
+    return _metadata.Type != PluginType::Intransient;
+}
+
 #endif