fix https://github.com/mt-mods/homedecor_modpack/issues/17

building_blocks/node_stairs.lua

@@ -1,4 +1,9 @@
 local S = minetest.get_translator("building_blocks")
+local stairs_compat
+
+if minetest.get_modpath("stairs") and not minetest.get_modpath("moreblocks") then
+	stairs_compat = dofile(minetest.get_modpath("building_blocks") .. "/stairs_compat.lua")
+end
 
 local function building_blocks_stairs(nodename, def)
 	minetest.register_node(nodename, def)
@@ -11,6 +16,9 @@ local function building_blocks_stairs(nodename, def)
 		minetest.register_alias("stairs:stair_inner_" .. name, mod .. ":stair_" .. name .. "_inner")
 		minetest.register_alias("stairs:stair_outer_" .. name, mod .. ":stair_" .. name .. "_outer")
 	end
+	if stairs_compat then
+		stairs_compat(nodename, def)
+	end
 end
 
 building_blocks_stairs("building_blocks:grate", {

building_blocks/stairs_compat.lua

@@ -0,0 +1,54 @@
+local stairtable = {
+    {
+        "slab",
+        {-0.5, -0.5, -0.5, 0.5, 0, 0.5},
+    },
+    {
+        "stair",
+        {
+            {-0.5, -0.5, -0.5, 0.5, 0.0, 0.5},
+            {-0.5, 0.0, 0.0, 0.5, 0.5, 0.5},
+        },
+    },
+    {
+        "stair_inner",
+        {
+            {-0.5, -0.5, -0.5, 0.5, 0.0, 0.5},
+            {-0.5, 0.0, 0.0, 0.5, 0.5, 0.5},
+            {-0.5, 0.0, -0.5, 0.0, 0.5, 0.0},
+        },
+    },
+    {
+        "stair_outer",
+        {
+            {-0.5, -0.5, -0.5, 0.5, 0.0, 0.5},
+            {-0.5, 0.0, 0.0, 0.0, 0.5, 0.5},
+        },
+    },
+}
+
+local function register(name, def)
+    for _, sdef in pairs(stairtable) do
+        local split = name:split(":")
+        local ndef = table.copy(def)
+        local item_name = ":" .. sdef[1] .. "_" .. split[2]
+
+        ndef.description = def.description .. " " .. string.gsub(sdef[1], "_", " ")
+        ndef.paramtype, ndef.paramtype2 = "light", "facedir"
+        ndef.drawtype = "nodebox"
+        ndef.node_box = {
+            type = "fixed",
+            fixed = sdef[2],
+        }
+
+        minetest.register_node(split[1] .. item_name, ndef)
+        minetest.register_alias("stairs" .. item_name, split[1] .. item_name)
+    end
+end
+
+minetest.log(
+    "action",
+    "[building_blocks]: depreciated legacy support for stairs loaded, please use moreblocks for stair support"
+)
+
+return register