From 7e77f5c45be7b232d279c7ec90f3f98bafe3ac07 Mon Sep 17 00:00:00 2001
From: Andrew Belt <andrewpbelt@gmail.com>
Date: Mon, 16 Sep 2019 04:00:12 -0400
Subject: [PATCH] Add WIP PythonEngine.

---
 src/PythonEngine.cpp | 59 ++++++++++++++++++++++++++++++++++++++++++++
 tests/hello.py       |  2 ++
 2 files changed, 61 insertions(+)
 create mode 100644 src/PythonEngine.cpp
 create mode 100644 tests/hello.py

diff --git a/src/PythonEngine.cpp b/src/PythonEngine.cpp
new file mode 100644
index 0000000..899c8db
--- /dev/null
+++ b/src/PythonEngine.cpp
@@ -0,0 +1,59 @@
+#include "ScriptEngine.hpp"
+#include <Python.h>
+
+
+extern rack::Plugin* pluginInstance;
+
+
+struct PythonEngine : ScriptEngine {
+	PyInterpreterState* interp = NULL;
+
+	~PythonEngine() {
+		if (interp)
+			PyInterpreterState_Delete(interp);
+	}
+
+	std::string getEngineName() override {
+		return "Python";
+	}
+
+	int run(const std::string& path, const std::string& script) override {
+		// Initialize Python
+		if (!Py_IsInitialized()) {
+			std::string pythonPath = rack::asset::plugin(pluginInstance, "dep/lib/python3.7");
+			wchar_t* pythonPathW = Py_DecodeLocale(pythonPath.c_str(), NULL);
+			Py_SetPath(pythonPathW);
+			PyMem_RawFree(pythonPathW);
+			Py_InitializeEx(0);
+
+			PyEval_InitThreads();
+		}
+		if (!Py_IsInitialized()) {
+			return -1;
+		}
+
+		PyThreadState* tstate = PyThreadState_Get();
+		interp = PyInterpreterState_New();
+		PyThreadState_Swap(tstate);
+
+		if (PyRun_SimpleString(script.c_str())) {
+			return -1;
+		}
+
+		// rack::DEBUG("4");
+		return 0;
+	}
+
+	int process() override {
+		PyThreadState* tstate = PyThreadState_New(interp);
+		PyEval_RestoreThread(tstate);
+		PyThreadState_Clear(tstate);
+		PyThreadState_DeleteCurrent();
+		return 0;
+	}
+};
+
+
+ScriptEngine* createPythonEngine() {
+	return new PythonEngine;
+}
\ No newline at end of file
diff --git a/tests/hello.py b/tests/hello.py
new file mode 100644
index 0000000..eab499c
--- /dev/null
+++ b/tests/hello.py
@@ -0,0 +1,2 @@
+
+print("Hello, world!")
\ No newline at end of file