From b7f723619d3dfdac02d7c5a0d5de45a9c4341ed1 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sat, 2 Apr 2016 23:41:33 +0200
Subject: [PATCH] convenient Lua bindings to use Ardour::DataType

---
 libs/ardour/ardour/lua_api.h |  4 ++++
 libs/ardour/lua_api.cc       | 25 +++++++++++++++++++++++++
 libs/ardour/luabindings.cc   |  3 +++
 3 files changed, 32 insertions(+)

diff --git a/libs/ardour/ardour/lua_api.h b/libs/ardour/ardour/lua_api.h
index fd6bc364fd..7f0b54403b 100644
--- a/libs/ardour/ardour/lua_api.h
+++ b/libs/ardour/ardour/lua_api.h
@@ -30,6 +30,10 @@
 
 namespace ARDOUR { namespace LuaAPI {
 
+	int datatype_ctor_nil (lua_State *L);
+	int datatype_ctor_audio (lua_State *L);
+	int datatype_ctor_midi (lua_State *L);
+
 	/** create a new Lua Processor (Plugin)
 	 *
 	 * @param s Session Handle
diff --git a/libs/ardour/lua_api.cc b/libs/ardour/lua_api.cc
index a21dbfb3ea..3bd4fc43f6 100644
--- a/libs/ardour/lua_api.cc
+++ b/libs/ardour/lua_api.cc
@@ -36,6 +36,31 @@ using namespace ARDOUR;
 using namespace PBD;
 using namespace std;
 
+int
+ARDOUR::LuaAPI::datatype_ctor_nil (lua_State *L)
+{
+	DataType dt (DataType::NIL);
+	luabridge::Stack <DataType>::push (L, dt);
+	return 1;
+}
+
+int
+ARDOUR::LuaAPI::datatype_ctor_audio (lua_State *L)
+{
+	DataType dt (DataType::AUDIO);
+	// NB luabridge will copy construct the object and manage lifetime.
+	luabridge::Stack <DataType>::push (L, dt);
+	return 1;
+}
+
+int
+ARDOUR::LuaAPI::datatype_ctor_midi (lua_State *L)
+{
+	DataType dt (DataType::MIDI);
+	luabridge::Stack <DataType>::push (L, dt);
+	return 1;
+}
+
 boost::shared_ptr<Processor>
 ARDOUR::LuaAPI::new_luaproc (Session *s, const string& name)
 {
diff --git a/libs/ardour/luabindings.cc b/libs/ardour/luabindings.cc
index 8c5023cfd7..41a29807eb 100644
--- a/libs/ardour/luabindings.cc
+++ b/libs/ardour/luabindings.cc
@@ -469,6 +469,9 @@ LuaBindings::common (lua_State* L)
 
 		.beginClass <DataType> ("DataType")
 		.addConstructor <void (*) (std::string)> ()
+		.addStaticCFunction ("null",  &LuaAPI::datatype_ctor_nil) // "nil" is a lua reseved word
+		.addStaticCFunction ("audio", &LuaAPI::datatype_ctor_audio)
+		.addStaticCFunction ("midi",  &LuaAPI::datatype_ctor_midi)
 		.endClass()
 
 		/* libardour enums */