Python: Reduce boilerplate

src/platform/python/mgba/__init__.py

@@ -0,0 +1,15 @@
+# Copyright (c) 2013-2017 Jeffrey Pfau
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+from ._pylib import ffi, lib
+
+def createCallback(structName, cbName, funcName=None):
+    funcName = funcName or "_py{}{}".format(structName, cbName.capitalize())
+    fullStruct = "struct {}*".format(structName)
+    def cb(handle, *args):
+        h = ffi.cast(fullStruct, handle)
+        getattr(ffi.from_handle(h.pyobj), cbName)(*args)
+
+    return ffi.def_extern(name=funcName)(cb)

src/platform/python/mgba/log.py

@@ -4,11 +4,9 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 from ._pylib import ffi, lib
+from . import createCallback
 
-@ffi.def_extern()
-def _pyLog(logger, category, level, message):
-	l = ffi.cast("struct mLoggerPy*", logger)
-	ffi.from_handle(l.pyobj).log(category, level, ffi.string(message).decode('UTF-8'))
+createCallback("mLoggerPy", "log", "_pyLog")
 
 def installDefault(logger):
 	lib.mLogSetDefaultLogger(logger._native)