Add LuaVoxelManip methods: get_node_at() and set_node_at()

doc/lua_api.txt

@@ -2077,6 +2077,8 @@ methods:
   ^ returns actual emerged pmin, actual emerged pmax
 - write_to_map():  Writes the data loaded from the VoxelManip back to the map.
   ^ important: data must be set using VoxelManip:set_data before calling this
+- get_node_at(pos): Returns a MapNode table of the node currently loaded in the VoxelManip at that position
+- set_node_at(pos, node): Sets a specific MapNode in the VoxelManip at that position
 - get_data():  Gets the data read into the VoxelManip object
   ^ returns raw node data is in the form of an array of node content ids
 - set_data(data):  Sets the data contents of the VoxelManip object

src/script/lua_api/l_env.cpp

@@ -35,10 +35,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "treegen.h"
 #include "pathfinder.h"
 
-
 #define GET_ENV_PTR ServerEnvironment* env =                                   \
 				dynamic_cast<ServerEnvironment*>(getEnv(L));                   \
-				if( env == NULL) return 0
+				if (env == NULL) return 0
 
 ///////////////////////////////////////////////////////////////////////////////
 

src/script/lua_api/l_vmanip.cpp

@@ -20,6 +20,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "lua_api/l_vmanip.h"
 #include "lua_api/l_internal.h"
+#include "common/c_content.h"
 #include "common/c_converter.h"
 #include "emerge.h"
 #include "environment.h"
@@ -27,6 +28,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "server.h"
 #include "mapgen.h"
 
+#define GET_ENV_PTR ServerEnvironment* env =                                   \
+				dynamic_cast<ServerEnvironment*>(getEnv(L));                   \
+				if (env == NULL) return 0
+
 // garbage collector
 int LuaVoxelManip::gc_object(lua_State *L)
 {
@@ -105,13 +110,37 @@ int LuaVoxelManip::l_write_to_map(lua_State *L)
 	return 0;
 }
 
+int LuaVoxelManip::l_get_node_at(lua_State *L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	GET_ENV_PTR;
+
+	LuaVoxelManip *o = checkobject(L, 1);
+	v3s16 pos        = read_v3s16(L, 2);
+
+	pushnode(L, o->vm->getNodeNoExNoEmerge(pos), env->getGameDef()->ndef());
+	return 1;
+}
+
+int LuaVoxelManip::l_set_node_at(lua_State *L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	GET_ENV_PTR;
+
+	LuaVoxelManip *o = checkobject(L, 1);
+	v3s16 pos        = read_v3s16(L, 2);
+	MapNode n        = readnode(L, 3, env->getGameDef()->ndef());
+
+	o->vm->setNodeNoEmerge(pos, n);
+
+	return 0;
+}
+
 int LuaVoxelManip::l_update_liquids(lua_State *L)
 {
-	LuaVoxelManip *o = checkobject(L, 1);
+	GET_ENV_PTR;
 
-	Environment *env = getEnv(L);
+	LuaVoxelManip *o = checkobject(L, 1);
-	if (!env)
-		return 0;
 
 	Map *map = &(env->getMap());
 	INodeDefManager *ndef = getServer(L)->getNodeDefManager();
@@ -399,6 +428,8 @@ const luaL_reg LuaVoxelManip::methods[] = {
 	luamethod(LuaVoxelManip, read_from_map),
 	luamethod(LuaVoxelManip, get_data),
 	luamethod(LuaVoxelManip, set_data),
+	luamethod(LuaVoxelManip, get_node_at),
+	luamethod(LuaVoxelManip, set_node_at),
 	luamethod(LuaVoxelManip, write_to_map),
 	luamethod(LuaVoxelManip, update_map),
 	luamethod(LuaVoxelManip, update_liquids),

src/script/lua_api/l_vmanip.h

@@ -47,6 +47,9 @@ private:
 	static int l_set_data(lua_State *L);
 	static int l_write_to_map(lua_State *L);
 
+	static int l_get_node_at(lua_State *L);
+	static int l_set_node_at(lua_State *L);
+
 	static int l_update_map(lua_State *L);
 	static int l_update_liquids(lua_State *L);