From 047c35bf0aaec2601d6e26e5ab479eeccc58f640 Mon Sep 17 00:00:00 2001
From: Patrick Monnerat <patrick@monnerat.net>
Date: Sat, 19 Jan 2019 01:20:47 +0100
Subject: Implement Python 3 C API compatibility using conditional and macros.

The updated sources are still compatible with Python 2.
---
 src/caja-python-object.c | 26 ++++++++++++++++++++------
 src/caja-python.c        | 12 +++++++++++-
 2 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/src/caja-python-object.c b/src/caja-python-object.c
index fb9d3d7..d3d46fc 100644
--- a/src/caja-python-object.c
+++ b/src/caja-python-object.c
@@ -44,6 +44,20 @@
 
 static GObjectClass *parent_class;
 
+#if PY_MAJOR_VERSION >= 3
+#define STRING_CHECK(obj)	PyUnicode_Check(obj)
+#define STRING_FROMSTRING(str)	PyUnicode_FromString(str)
+#define STRING_ASSTRING(obj)	PyUnicode_AsUTF8(obj)
+#define INT_CHECK(obj)		PyLong_Check(obj)
+#define INT_ASLONG(obj)		PyLong_AsLong(obj)
+#else
+#define STRING_CHECK(obj)	PyString_Check(obj)
+#define STRING_FROMSTRING(str)	PyString_FromString(str)
+#define STRING_ASSTRING(obj)	PyString_AsString(obj)
+#define INT_CHECK(obj)		PyInt_Check(obj)
+#define INT_ASLONG(obj)		PyInt(obj)
+#endif
+
 /* These macros assumes the following things:
  *   a METHOD_NAME is defined with is a string
  *   a goto label called beach
@@ -85,7 +99,7 @@ static GObjectClass *parent_class;
 #define HANDLE_LIST(py_ret, type, type_name)                           \
     {                                                                  \
         Py_ssize_t i = 0;                                              \
-    	if (!PySequence_Check(py_ret) || PyString_Check(py_ret))       \
+    	if (!PySequence_Check(py_ret) || STRING_CHECK(py_ret))         \
     	{                                                              \
     		PyErr_SetString(PyExc_TypeError,                           \
     						METHOD_NAME " must return a sequence");    \
@@ -194,7 +208,7 @@ caja_python_object_get_widget (CajaLocationWidgetProvider *provider,
 	CHECK_OBJECT(object);
 	CHECK_METHOD_NAME(object->instance);
 
-	py_uri = PyString_FromString(uri);
+	py_uri = STRING_FROMSTRING(uri);
 
 	py_ret = PyObject_CallMethod(object->instance, METHOD_PREFIX METHOD_NAME,
 								 "(NN)", py_uri,
@@ -425,14 +439,14 @@ caja_python_object_update_file_info (CajaInfoProvider 		*provider,
 	
 	HANDLE_RETVAL(py_ret);
 
-	if (!PyInt_Check(py_ret))
+	if (!INT_CHECK(py_ret))
 	{
 		PyErr_SetString(PyExc_TypeError,
 						METHOD_NAME " must return None or a int");
 		goto beach;
 	}
 
-	ret = PyInt_AsLong(py_ret);
+	ret = INT_ASLONG(py_ret);
 	
  beach:
  	free_pygobject_data(file, NULL);
@@ -522,7 +536,7 @@ caja_python_object_get_type (GTypeModule *module,
 		NULL
 	};
 
-	debug_enter_args("type=%s", PyString_AsString(PyObject_GetAttrString(type, "__name__")));
+	debug_enter_args("type=%s", STRING_ASSTRING(PyObject_GetAttrString(type, "__name__")));
 	info = g_new0 (GTypeInfo, 1);
 	
 	info->class_size = sizeof (CajaPythonObjectClass);
@@ -534,7 +548,7 @@ caja_python_object_get_type (GTypeModule *module,
 	Py_INCREF(type);
 
 	type_name = g_strdup_printf("%s+CajaPython",
-								PyString_AsString(PyObject_GetAttrString(type, "__name__")));
+								STRING_ASSTRING(PyObject_GetAttrString(type, "__name__")));
 		
 	gtype = g_type_module_register_type (module, 
 										 G_TYPE_OBJECT,
diff --git a/src/caja-python.c b/src/caja-python.c
index 7f13e36..4a310a4 100644
--- a/src/caja-python.c
+++ b/src/caja-python.c
@@ -31,6 +31,12 @@
 
 #include <libcaja-extension/caja-extension-types.h>
 
+#if PY_MAJOR_VERSION >= 3
+#define STRING_FROMSTRING(str)	PyUnicode_FromString(str)
+#else
+#define STRING_FROMSTRING(str)	PyString_FromString(str)
+#endif
+
 static const GDebugKey caja_python_debug_keys[] = {
 	{"misc", CAJA_PYTHON_DEBUG_MISC},
 };
@@ -145,7 +151,7 @@ caja_python_load_dir (GTypeModule *module,
 				
 				/* sys.path.insert(0, dirname) */
 				sys_path = PySys_GetObject("path");
-				py_path = PyString_FromString(dirname);
+				py_path = STRING_FROMSTRING(dirname);
 				PyList_Insert(sys_path, 0, py_path);
 				Py_DECREF(py_path);
 			}
@@ -159,7 +165,11 @@ caja_python_init_python (void)
 {
 	PyObject *gi, *require_version, *args, *caja;
 	GModule *libpython;
+#if PY_MAJOR_VERSION >= 3
+	wchar_t *argv[] = { L"caja", NULL };
+#else
 	char *argv[] = { "caja", NULL };
+#endif
 
 	if (Py_IsInitialized())
 		return TRUE;
-- 
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