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Writing a plugin

A minimal native plugin is one class, one factory macro, one JSON file, and a short CMakeLists.txt. You can author it entirely out-of-tree against the Plugin SDK — no MTE source checkout required.

Draft

This walkthrough is grounded in PLUGIN_ARCHITECTURE.md; verify the exact SDK package name and mte_add_plugin() arguments against the shipped SDK before relying on them.

1. Implement IPlugin

#include <PluginApi/IPlugin.h>
#include <PluginApi/IPluginContext.h>

class HelloWorldPlugin : public MTE::plugin::IPlugin {
public:
    MTE::plugin::PluginInfo info() const override {
        return { "org.mte.helloworld", "Hello World", "1.0.0",
                 "Example Vendor", "Says hi.", MTE_PLUGIN_API_VERSION };
    }

    bool initialize(MTE::plugin::IPluginContext& ctx) override {
        m_cmd = ctx.commands().registerCommand(
            { "helloworld.sayHi", "Say Hi", "Ctrl+Alt+H", "Hello" },
            [&ctx] { ctx.log().log(MTE::plugin::LogLevel::Info, "Hi!"); });
        m_menu = ctx.menus().addItem("Plugins/Say Hi", "helloworld.sayHi");
        return true;
    }

    void shutdown() noexcept override {}   // tokens tear down automatically

private:
    MTE::plugin::CommandToken m_cmd;
    MTE::plugin::MenuToken    m_menu;
};

2. Export the factory (native Qt backend)

#include <PluginApi/Qt/PluginQtGlue.h>

class HelloWorldFactory : public QObject, public MTE::plugin::IPluginFactory {
    Q_OBJECT
    Q_PLUGIN_METADATA(IID "org.mte.IPluginFactory/1" FILE "plugin.json")
    Q_INTERFACES(MTE::plugin::IPluginFactory)
public:
    std::unique_ptr<MTE::plugin::IPlugin> create() override {
        return std::make_unique<HelloWorldPlugin>();
    }
};

3. Describe it in plugin.json

{
  "id":         "org.mte.helloworld",
  "name":       "Hello World",
  "version":    "1.0.0",
  "apiVersion": 1,
  "entry":      "native",
  "requires":   [],
  "order":      600,
  "menus": [
    { "title": "Plugins", "barPriority": 70, "itemPriority": 100 }
  ]
}

The apiVersion here and the one returned by info() must both equal MTE_PLUGIN_API_VERSION, or the host refuses to load the plugin.

4. Build it

Use the SDK's CMake helper:

find_package(MTEPluginSDK REQUIRED)
mte_add_plugin(NAME HelloWorldPlugin
    SOURCES Src/HelloWorldPlugin.cpp
    # TRANSLATIONS Translations/HelloWorld_en.ts ...
)

5. Install & run

Drop the built library into a discovered plugin directory (see Architecture overview) and restart the editor. Enable it in Preferences ▸ Plugins if needed.

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