re-import from eco

build.lua

@@ -119,6 +119,12 @@ function building_lib.build_mapgen(mapblock_pos, building_name, rotation)
 	local building_def = building_lib.get_building(building_name)
 	local placement = building_lib.get_placement(building_def.placement)
 
+	-- 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
+
 	building_lib.store:merge(mapblock_pos, {
 		building = {
 			name = building_def.name,
@@ -127,7 +133,7 @@ function building_lib.build_mapgen(mapblock_pos, building_name, rotation)
 		}
 	})
 
-	placement.place(placement, mapblock_pos, building_def, {}, rotation)
+	placement.place(placement, mapblock_pos, building_def, replacements, rotation)
 	building_lib.fire_event("placed_mapgen", {
 		mapblock_pos = mapblock_pos,
 		building_def = building_def,

init.lua

@@ -15,6 +15,7 @@ dofile(MP .. "/api.lua")
 dofile(MP .. "/wield_events.lua")
 dofile(MP .. "/common.lua")
 dofile(MP .. "/placements/mapblock_lib.lua")
+dofile(MP .. "/placements/dummy.lua")
 dofile(MP .. "/conditions.lua")
 dofile(MP .. "/build.lua")
 dofile(MP .. "/build_tool.lua")
@@ -28,7 +29,6 @@ dofile(MP .. "/hacks.lua")
 dofile(MP .. "/mapgen.lua")
 
 if minetest.get_modpath("mtt") and mtt.enabled then
-	dofile(MP .. "/mtt.lua")
 	dofile(MP .. "/events.spec.lua")
 	dofile(MP .. "/conditions.spec.lua")
 	dofile(MP .. "/build.spec.lua")

placements/dummy.lua

@@ -0,0 +1,9 @@
+
+building_lib.register_placement("dummy", {
+    check = function() return true end,
+    get_size = function(_, _, building_def, rotation)
+        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
+})

readme.md

@@ -86,10 +86,14 @@ Built-in conditions:
 ## Events
 
 ```lua
-building_lib.register_on("placed", function(mapblock_pos, playername, building_def, rotation, size) end)
+building_lib.register_on("placed", function(event) end)
-building_lib.register_on("placed_over", function(mapblock_pos, playername, old_building_def, new_building_def, rotation, size) end)
+-- event payload fields: mapblock_pos, playername, building_def, rotation, size
-building_lib.register_on("placed_mapgen", function(mapblock_pos, building_def, rotation) end)
+building_lib.register_on("placed_over", function(event) end)
-building_lib.register_on("removed", function(mapblock_pos, playername, building_info) end)
+-- event payload fields: mapblock_pos, playername, old_building_def, new_building_def, rotation, size
+building_lib.register_on("placed_mapgen", function(event) end)
+-- event payload fields: mapblock_pos, playername, building_def, rotation, size
+building_lib.register_on("removed", function(event) end)
+-- event payload fields: mapblock_pos, playername, old_building_def, building_info
 ```
 
 ## Chat commands

remove.lua

@@ -49,7 +49,8 @@ function building_lib.remove(mapblock_pos, playername)
     building_lib.fire_event("removed", {
         mapblock_pos = origin,
         playername = playername,
-        building_info = building_info
+        building_info = building_info,
+        old_building_def = building_lib.get_building(building_info.name)
     })
     return true
 end