From 871bc1568f94ee4026fd64df062572b91d45d462 Mon Sep 17 00:00:00 2001
From: cbdev <cb@cbcdn.com>
Date: Sat, 4 Jan 2020 18:39:04 +0100
Subject: Add input_channel call to Lua backend

---
 backends/lua.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'backends/lua.c')

diff --git a/backends/lua.c b/backends/lua.c
index ee9e03f..510fc72 100644
--- a/backends/lua.c
+++ b/backends/lua.c
@@ -9,6 +9,7 @@
 #endif
 
 #define LUA_REGISTRY_KEY "_midimonster_lua_instance"
+#define LUA_REGISTRY_CURRENT_CHANNEL "_midimonster_lua_channel"
 
 static size_t timers = 0;
 static lua_timer* timer = NULL;
@@ -189,6 +190,7 @@ static int lua_callback_interval(lua_State* interpreter){
 	if(lua_gettable(interpreter, LUA_REGISTRYINDEX) == LUA_TNUMBER){
 		//already interval'd
 		reference = luaL_checkinteger(interpreter, 4);
+		DBGPF("Updating interval to %" PRIu64 " msec", interval);
 	}
 	else if(interval){
 		//get a reference to the function
@@ -199,6 +201,8 @@ static int lua_callback_interval(lua_State* interpreter){
 		lua_pushvalue(interpreter, 1);
 		lua_pushinteger(interpreter, reference);
 		lua_settable(interpreter, LUA_REGISTRYINDEX);
+
+		DBGPF("Registered interval with %" PRIu64 " msec", interval);
 	}
 
 	//find matching timer
@@ -273,6 +277,12 @@ static int lua_callback_output_value(lua_State* interpreter){
 	return lua_callback_value(interpreter, 0);
 }
 
+static int lua_callback_input_channel(lua_State* interpreter){
+	lua_pushstring(interpreter, LUA_REGISTRY_CURRENT_CHANNEL);
+	lua_gettable(interpreter, LUA_REGISTRYINDEX);
+	return 1;
+}
+
 static int lua_configure(char* option, char* value){
 	LOG("No backend configuration possible");
 	return 1;
@@ -320,6 +330,7 @@ static instance* lua_instance(){
 	lua_register(data->interpreter, "interval", lua_callback_interval);
 	lua_register(data->interpreter, "input_value", lua_callback_input_value);
 	lua_register(data->interpreter, "output_value", lua_callback_output_value);
+	lua_register(data->interpreter, "input_channel", lua_callback_input_channel);
 
 	//store instance pointer to the lua state
 	lua_pushstring(data->interpreter, LUA_REGISTRY_KEY);
@@ -374,6 +385,11 @@ static int lua_set(instance* inst, size_t num, channel** c, channel_value* v){
 		data->input[c[n]->ident] = v[n].normalised;
 		//call lua channel handlers if present
 		if(data->reference[c[n]->ident] != LUA_NOREF){
+			//push the channel name
+			lua_pushstring(data->interpreter, LUA_REGISTRY_CURRENT_CHANNEL);
+			lua_pushstring(data->interpreter, data->channel_name[c[n]->ident]);
+			lua_settable(data->interpreter, LUA_REGISTRYINDEX);
+
 			lua_rawgeti(data->interpreter, LUA_REGISTRYINDEX, data->reference[c[n]->ident]);
 			lua_pushnumber(data->interpreter, v[n].normalised);
 			if(lua_pcall(data->interpreter, 1, 0, 0) != LUA_OK){
@@ -382,6 +398,11 @@ static int lua_set(instance* inst, size_t num, channel** c, channel_value* v){
 			}
 		}
 	}
+
+	//clear the channel name
+	lua_pushstring(data->interpreter, LUA_REGISTRY_CURRENT_CHANNEL);
+	lua_pushnil(data->interpreter);
+	lua_settable(data->interpreter, LUA_REGISTRYINDEX);
 	return 0;
 }
 
@@ -422,6 +443,7 @@ static int lua_handle(size_t num, managed_fd* fds){
 				timer[n].delta %= timer[n].interval;
 				lua_rawgeti(timer[n].interpreter, LUA_REGISTRYINDEX, timer[n].reference);
 				lua_pcall(timer[n].interpreter, 0, 0, 0);
+				DBGPF("Calling interval timer function %" PRIsize_t, n);
 			}
 		}
 	}
-- 
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