From 6b5101ecec04fe480d3e03885fadd0f4611b4077 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mario=20H=C3=BCttel?= <mario.huettel@gmx.net>
Date: Sun, 17 Nov 2019 00:02:42 +0100
Subject: [PATCH] plugins: python renderer: Load module

---
 plugins/python-renderer/src/plugin-main.c | 52 +++++++++++++++++++++--
 1 file changed, 49 insertions(+), 3 deletions(-)

diff --git a/plugins/python-renderer/src/plugin-main.c b/plugins/python-renderer/src/plugin-main.c
index b933bc0..19eecbb 100644
--- a/plugins/python-renderer/src/plugin-main.c
+++ b/plugins/python-renderer/src/plugin-main.c
@@ -5,6 +5,26 @@
 #include <gds-render/gds-utils/gds-types.h>
 #include <gds-render/output-renderers/external-renderer-interfaces.h>
 
+/**
+ * @brief Global variable for loaded module. This is not very nice.
+ * @warning This has to be changed, if this api wants to be re-entrant.
+ */
+static PyObject *p_module = NULL;
+
+static int check_file_exists(const char *path)
+{
+	FILE *file;
+	int ret = -1;
+
+	file = fopen(path, "rb");
+	if (file) {
+		fclose(file);
+		ret = 0;
+	}
+
+	return ret;
+}
+
 int FUNC_DECL(EXTERNAL_LIBRARY_RENDER_FUNCTION)(struct gds_cell *toplevel, GList *layer_info_list, const char *output_file_name, double scale)
 {
 	if (!toplevel)
@@ -16,14 +36,40 @@ int FUNC_DECL(EXTERNAL_LIBRARY_RENDER_FUNCTION)(struct gds_cell *toplevel, GList
 
 int FUNC_DECL(EXTERNAL_LIBRARY_INIT_FUNCTION)(const char *params, const char *version)
 {
+	int ret = 0;
+	PyObject *p_name;
+
+	if (!params || !version)
+		return -1000;
+
 	printf("Init with params: %s\ngds-render version: %s\n", params, version);
 	Py_Initialize();
 
-	return 0;
+	/* This renderer has only one parameter: The name of the file */
+	if (check_file_exists(params))
+		return -1001;
+
+	p_name = PyUnicode_DecodeFSDefault(params);
+	p_module = PyImport_Import(p_name);
+	Py_DECREF(p_name);
+
+	if (!p_module) {
+		PyErr_Print();
+		fprintf(stderr, "Failed to load %s\n", params);
+		ret = -1;
+		goto return_value;
+	}
+
+
+
+return_value:
+	return ret;
 }
 
 int FUNC_DECL(EXTERNAL_LIBRARY_FINALIZE_FUNCTION)(void)
 {
-	Py_Finalize();
-	return 0;
+	int ret;
+
+	ret = Py_FinalizeEx();
+	return ret;
 }