add stairs api (#56)

src/stairs.lua

@@ -0,0 +1,8 @@
+local filename = xcompat.gameid
+
+--if we dont have a stairs file for the game, use xcompat_agnostic
+if not xcompat.utilities.file_exists(xcompat.modpath .. "/src/stairs/" .. filename .. ".lua") then
+    filename = "xcompat_agnostic"
+end
+
+return dofile(xcompat.modpath .. "/src/stairs/" .. filename .. ".lua")

src/stairs/farlands_reloaded.lua

@@ -0,0 +1,25 @@
+local function register(name, _)
+    local splitName = name:split(":")
+    local sName = splitName[2]
+
+    local groups = core.registered_nodes[name].groups
+    groups.stairable = 1
+
+    core.override_item(name, {groups = groups})
+
+    local flStairNameOverrides = {
+        ["stair_inner"] = "inner_stair",
+        ["stair_outer"] = "outer_stair"
+    }
+
+    for _, type in pairs({"slab", "stair", "stair_inner", "stair_outer"}) do
+
+
+        minetest.register_alias(
+            splitName[1] .. ":" .. type .. "_" .. sName,
+            splitName[1] .. ":" .. sName .. "_" .. (flStairNameOverrides[type] or type)
+        )
+    end
+end
+
+return {register = register}

src/stairs/minetest.lua

@@ -0,0 +1,19 @@
+local function register(name, def)
+    local splitName = name:split(":")
+    local sName = splitName[2]
+
+    stairs.register_stair_and_slab(
+        sName,
+        nil,
+        def.groups,
+        def.tiles,
+        def.description,
+        def.sounds
+    )
+
+    for _, type in pairs({"slab", "stair", "stair_inner", "stair_outer"}) do
+        minetest.register_alias(splitName[1] .. ":" .. type .. "_" .. sName, "stairs:" .. type .. "_" .. sName)
+    end
+end
+
+return {register = register}

src/stairs/xcompat_agnostic.lua

@@ -0,0 +1,48 @@
+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)
+    end
+end
+
+return {register = register}