new event format

build.lua

@@ -78,18 +78,37 @@ function building_lib.build(mapblock_pos, playername, building_name, rotation, c
 		end
 	end)
 
-	placement.place(placement, mapblock_pos, building_def, rotation, function()
+	-- get or calculate replacements
+	local replacements = building_def.replace
+	if type(building_def.replace) == "function" then
+		replacements = building_def.replace(mapblock_pos, building_def)
+	end
+
+	placement.place(placement, mapblock_pos, building_def, replacements, rotation, function()
 		callback()
 		if old_building_info then
 			-- replacement
 			local old_building_def = building_lib.get_building(old_building_info.name)
-			building_lib.fire_event("replaced", mapblock_pos, playername,
-				old_building_def, old_building_info.rotation, old_building_info.size,
-				building_def, rotation, size
-			)
+			building_lib.fire_event("replaced", {
+				playername = playername,
+				mapblock_pos = mapblock_pos,
+				old_building_def = old_building_def,
+				old_building_info = old_building_info,
+				building_def = building_def,
+				replacements = replacements,
+				rotation = rotation,
+				size = size
+			})
 		else
 			-- new build
-			building_lib.fire_event("placed", mapblock_pos, playername, building_def, rotation, size)
+			building_lib.fire_event("placed", {
+				playername = playername,
+				mapblock_pos = mapblock_pos,
+				building_def = building_def,
+				replacements = replacements,
+				rotation = rotation,
+				size = size
+			})
 		end
 	end)
 	return true
@@ -108,6 +127,10 @@ function building_lib.build_mapgen(mapblock_pos, building_name, rotation)
 		}
 	})
 
-	placement.place(placement, mapblock_pos, building_def, rotation)
-	building_lib.fire_event("placed_mapgen", mapblock_pos, building_def, rotation)
+	placement.place(placement, mapblock_pos, building_def, {}, rotation)
+	building_lib.fire_event("placed_mapgen", {
+		mapblock_pos = mapblock_pos,
+		building_def = building_def,
+		rotation = rotation
+	})
 end

mtt.lua

@@ -4,5 +4,5 @@ building_lib.register_placement("dummy", {
         local size = building_def.size or {x=1,y=1,z=1}
         return mapblock_lib.rotate_size(size, rotation)
     end,
-    place = function(_, _, _, _, callback) callback() end
+    place = function(_, _, _, _, _, callback) callback() end
 })

placements/mapblock_lib.lua

@@ -1,7 +1,7 @@
 
 -- mapblock_lib schematic catalog
 building_lib.register_placement("mapblock_lib", {
-	place = function(self, mapblock_pos, building_def, rotation, callback)
+	place = function(self, mapblock_pos, building_def, replacements, rotation, callback)
 		callback = callback or function() end
 
 		local catalog
@@ -33,12 +33,6 @@ building_lib.register_placement("mapblock_lib", {
 
 		local iterator = mapblock_lib.pos_iterator(catalog_pos1, catalog_pos2)
 
-		-- get or calculate replacements
-		local replace = building_def.replace
-		if type(building_def.replace) == "function" then
-			replace = building_def.replace(mapblock_pos, building_def)
-		end
-
 		local function worker()
 			local catalog_pos = iterator()
 			if not catalog_pos then
@@ -61,7 +55,7 @@ building_lib.register_placement("mapblock_lib", {
 						angle = rotation,
 						disable_orientation = building_def.disable_orientation
 					},
-					replace = replace
+					replace = replacements
 				}
 			})
 

remove.lua

@@ -46,6 +46,10 @@ function building_lib.remove(mapblock_pos, playername)
         end
     end
 
-    building_lib.fire_event("removed", origin, playername, building_info)
+    building_lib.fire_event("removed", {
+        mapblock_pos = origin,
+        playername = playername,
+        building_info = building_info
+    })
     return true
 end