Add Alias Functions (#54)

* register_alias
* register_alias_force

6 files changed, 365 insertions, 260 deletions

diff --git a/stairsplus/init.lua b/stairsplus/init.lua
index 44f5972..1f2cefe 100644
--- a/stairsplus/init.lua
+++ b/stairsplus/init.lua
@@ -17,6 +17,21 @@ and minetest.setting_getbool("creative_mode") then
 	stairsplus.expect_infinite_stacks = true
 end
 
+function stairsplus.copytable(orig)
+	local orig_type = type(orig)
+	local copy
+	if orig_type == 'table' then
+		copy = {}
+		for orig_key, orig_value in next, orig, nil do
+			copy[stairsplus.copytable(orig_key)] = stairsplus.copytable(orig_value)
+		end
+		setmetatable(copy, stairsplus.copytable(getmetatable(orig)))
+	else
+		copy = orig
+	end
+	return copy
+end
+
 function stairsplus:prepare_groups(groups)
 	local result = {}
 	if groups then
@@ -41,6 +56,21 @@ function stairsplus:register_all(modname, subname, recipeitem, fields)
 	-- self:register_6dfacedir_conversion(modname, subname) -- Not needed as of Q3 2013, uncomment to fix old maps.
 end
 
+function stairsplus:register_alias_all(modname_old, subname_old, modname_new, subname_new)
+	self:register_stair_alias(modname_old, subname_old, modname_new, subname_new)
+	self:register_slab_alias(modname_old, subname_old, modname_new, subname_new)
+	self:register_slope_alias(modname_old, subname_old, modname_new, subname_new)
+	self:register_panel_alias(modname_old, subname_old, modname_new, subname_new)
+	self:register_micro_alias(modname_old, subname_old, modname_new, subname_new)
+end
+function stairsplus:register_alias_force_all(modname_old, subname_old, modname_new, subname_new)
+	self:register_stair_alias_force(modname_old, subname_old, modname_new, subname_new)
+	self:register_slab_alias_force(modname_old, subname_old, modname_new, subname_new)
+	self:register_slope_alias_force(modname_old, subname_old, modname_new, subname_new)
+	self:register_panel_alias_force(modname_old, subname_old, modname_new, subname_new)
+	self:register_micro_alias_force(modname_old, subname_old, modname_new, subname_new)
+end
+
 function register_stair_slab_panel_micro(modname, subname, recipeitem, groups, images, description, drop, light)
 	stairsplus:register_all(modname, subname, recipeitem, {
 		groups = groups,
diff --git a/stairsplus/microblocks.lua b/stairsplus/microblocks.lua
index 3d5de1f..a457d10 100644
--- a/stairsplus/microblocks.lua
+++ b/stairsplus/microblocks.lua
@@ -20,52 +20,67 @@ function register_micro(modname, subname, recipeitem, groups, images, descriptio
 	})
 end
 
-function stairsplus:register_micro(modname, subname, recipeitem, fields)
-	local defs = {
-		[""] = {
-			node_box = {
-				type = "fixed",
-				fixed = {-0.5, -0.5, 0, 0, 0, 0.5},
-			},
+local microblocks_defs = {
+	[""] = {
+		node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, 0, 0, 0, 0.5},
+		},
+	},
+	["_1"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, 0, 0, -0.4375, 0.5},
 		},
-		["_1"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {-0.5, -0.5, 0, 0, -0.4375, 0.5},
-			},
+	},
+	["_2"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, 0, 0, -0.375, 0.5},
 		},
-		["_2"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {-0.5, -0.5, 0, 0, -0.375, 0.5},
-			},
+	},
+	["_4"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, 0, 0, -0.25, 0.5},
 		},
-		["_4"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {-0.5, -0.5, 0, 0, -0.25, 0.5},
-			},
+	},
+	["_12"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, 0, 0, 0.25, 0.5},
 		},
-		["_12"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {-0.5, -0.5, 0, 0, 0.25, 0.5},
-			},
+	},
+	["_14"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, 0, 0, 0.375, 0.5},
 		},
-		["_14"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {-0.5, -0.5, 0, 0, 0.375, 0.5},
-			},
+	},
+	["_15"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, 0, 0, 0.4375, 0.5},
 		},
-		["_15"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {-0.5, -0.5, 0, 0, 0.4375, 0.5},
-			},
-		}
 	}
+}
+
+function stairsplus:register_micro_alias(modname_old, subname_old, modname_new, subname_new)
+	local defs = stairsplus.copytable(microblocks_defs)
+	for alternate, def in pairs(defs) do
+		minetest.register_alias(modname_old .. ":micro_" .. subname_old .. alternate, modname_new .. ":micro_" .. subname_new .. alternate)
+	end
+end
 
+function stairsplus:register_micro_alias_force(modname_old, subname_old, modname_new, subname_new)
+	local defs = stairsplus.copytable(microblocks_defs)
+	for alternate, def in pairs(defs) do
+		minetest.register_alias_force(modname_old .. ":micro_" .. subname_old .. alternate, modname_new .. ":micro_" .. subname_new .. alternate)
+	end
+end
+
+function stairsplus:register_micro(modname, subname, recipeitem, fields)
+	local defs = stairsplus.copytable(microblocks_defs)
 	local desc = S("%s Microblock"):format(fields.description)
 	for alternate, def in pairs(defs) do
 		for k, v in pairs(fields) do
diff --git a/stairsplus/panels.lua b/stairsplus/panels.lua
index ab6ef83..314939b 100644
--- a/stairsplus/panels.lua
+++ b/stairsplus/panels.lua
@@ -20,52 +20,67 @@ function register_panel(modname, subname, recipeitem, groups, images, descriptio
 	})
 end
 
-function stairsplus:register_panel(modname, subname, recipeitem, fields)
-	local defs = {
-		[""] = {
-			node_box = {
-				type = "fixed",
-				fixed = {-0.5, -0.5, 0, 0.5, 0, 0.5},
-			},
+local panels_defs = {
+	[""] = {
+		node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, 0, 0.5, 0, 0.5},
+		},
+	},
+	["_1"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, 0, 0.5, -0.4375, 0.5},
 		},
-		["_1"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {-0.5, -0.5, 0, 0.5, -0.4375, 0.5},
-			},
+	},
+	["_2"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, 0, 0.5, -0.375, 0.5},
 		},
-		["_2"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {-0.5, -0.5, 0, 0.5, -0.375, 0.5},
-			},
+	},
+	["_4"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, 0, 0.5, -0.25, 0.5},
 		},
-		["_4"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {-0.5, -0.5, 0, 0.5, -0.25, 0.5},
-			},
+	},
+	["_12"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, 0, 0.5, 0.25, 0.5},
 		},
-		["_12"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {-0.5, -0.5, 0, 0.5, 0.25, 0.5},
-			},
+	},
+	["_14"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, 0, 0.5, 0.375, 0.5},
 		},
-		["_14"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {-0.5, -0.5, 0, 0.5, 0.375, 0.5},
-			},
+	},
+	["_15"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, 0, 0.5, 0.4375, 0.5},
 		},
-		["_15"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {-0.5, -0.5, 0, 0.5, 0.4375, 0.5},
-			},
-		}
 	}
+}
+
+function stairsplus:register_panel_alias(modname_old, subname_old, modname_new, subname_new)
+	local defs = stairsplus.copytable(panels_defs)
+	for alternate, def in pairs(defs) do
+		minetest.register_alias(modname_old .. ":panel_" .. subname_old .. alternate, modname_new .. ":panel_" .. subname_new .. alternate)
+	end
+end
 
+function stairsplus:register_panel_alias_force(modname_old, subname_old, modname_new, subname_new)
+	local defs = stairsplus.copytable(panels_defs)
+	for alternate, def in pairs(defs) do
+		minetest.register_alias_force(modname_old .. ":panel_" .. subname_old .. alternate, modname_new .. ":panel_" .. subname_new .. alternate)
+	end
+end
+
+function stairsplus:register_panel(modname, subname, recipeitem, fields)
+	local defs = stairsplus.copytable(panels_defs)
 	local desc = S("%s Panel"):format(fields.description)
 	for alternate, def in pairs(defs) do
 		for k, v in pairs(fields) do
diff --git a/stairsplus/slabs.lua b/stairsplus/slabs.lua
index 236d91e..2acdd41 100644
--- a/stairsplus/slabs.lua
+++ b/stairsplus/slabs.lua
@@ -20,17 +20,32 @@ function register_slab(modname, subname, recipeitem, groups, images, description
 	})
 end
 
-function stairsplus:register_slab(modname, subname, recipeitem, fields)
-	local defs = {
-		[""] = 8,
-		["_quarter"] = 4,
-		["_three_quarter"] = 12,
-		["_1"] = 1,
-		["_2"] = 2,
-		["_14"] = 14,
-		["_15"] = 15,
-	}
+local slabs_defs = {
+	[""] = 8,
+	["_quarter"] = 4,
+	["_three_quarter"] = 12,
+	["_1"] = 1,
+	["_2"] = 2,
+	["_14"] = 14,
+	["_15"] = 15,
+}
+
+function stairsplus:register_slab_alias(modname_old, subname_old, modname_new, subname_new)
+	local defs = stairsplus.copytable(slabs_defs)
+	for alternate, def in pairs(defs) do
+		minetest.register_alias(modname_old .. ":slab_" .. subname_old .. alternate, modname_new .. ":slab_" .. subname_new .. alternate)
+	end
+end
 
+function stairsplus:register_slab_alias_force(modname_old, subname_old, modname_new, subname_new)
+	local defs = stairsplus.copytable(slabs_defs)
+	for alternate, def in pairs(defs) do
+		minetest.register_alias_force(modname_old .. ":slab_" .. subname_old .. alternate, modname_new .. ":slab_" .. subname_new .. alternate)
+	end
+end
+
+function stairsplus:register_slab(modname, subname, recipeitem, fields)
+	local defs = stairsplus.copytable(slabs_defs)
 	local desc_base = S("%s Slab"):format(fields.description)
 	for alternate, num in pairs(defs) do
 		local def = {
diff --git a/stairsplus/slopes.lua b/stairsplus/slopes.lua
index f0e8c20..da524b6 100644
--- a/stairsplus/slopes.lua
+++ b/stairsplus/slopes.lua
@@ -123,103 +123,118 @@ function register_slope(modname, subname, recipeitem, groups, images, descriptio
 	})
 end
 
-function stairsplus:register_slope(modname, subname, recipeitem, fields)
-	local defs = {
-		[""] = {
-			mesh = "moreblocks_slope.obj",
-			collision_box = box_slope,
-			selection_box = box_slope,
-			
-		},
-		["_half"] = {
-			mesh = "moreblocks_slope_half.obj",
-			collision_box = box_slope_half,
-			selection_box = box_slope_half,
-		},
-		["_half_raised"] = {
-			mesh = "moreblocks_slope_half_raised.obj",
-			collision_box = box_slope_half_raised,
-			selection_box = box_slope_half_raised,
-		},
-		
---==============================================================
-		
-		["_inner"] = {
-			mesh = "moreblocks_slope_inner.obj",
-			collision_box = box_slope_inner,
-			selection_box = box_slope_inner,
-		},
-		["_inner_half"] = {
-			mesh = "moreblocks_slope_inner_half.obj",
-			collision_box = box_slope_inner_half,
-			selection_box = box_slope_inner_half,
-		},
-		["_inner_half_raised"] = {
-			mesh = "moreblocks_slope_inner_half_raised.obj",
-			collision_box = box_slope_inner_half_raised,
-			selection_box = box_slope_inner_half_raised,
-		},
-		
---==============================================================
-		
-		["_inner_cut"] = {
-			mesh = "moreblocks_slope_inner_cut.obj",
-			collision_box = box_slope_inner,
-			selection_box = box_slope_inner,
-		},
-		["_inner_cut_half"] = {
-			mesh = "moreblocks_slope_inner_cut_half.obj",
-			collision_box = box_slope_inner_half,
-			selection_box = box_slope_inner_half,
-		},
-		["_inner_cut_half_raised"] = {
-			mesh = "moreblocks_slope_inner_cut_half_raised.obj",
-			collision_box = box_slope_inner_half_raised,
-			selection_box = box_slope_inner_half_raised,
-		},
+local slopes_defs = {
+	[""] = {
+		mesh = "moreblocks_slope.obj",
+		collision_box = box_slope,
+		selection_box = box_slope,
 
---==============================================================
+	},
+	["_half"] = {
+		mesh = "moreblocks_slope_half.obj",
+		collision_box = box_slope_half,
+		selection_box = box_slope_half,
+	},
+	["_half_raised"] = {
+		mesh = "moreblocks_slope_half_raised.obj",
+		collision_box = box_slope_half_raised,
+		selection_box = box_slope_half_raised,
+	},
 
-		["_outer"] = {
-			mesh = "moreblocks_slope_outer.obj",
-			collision_box = box_slope_outer,
-			selection_box = box_slope_outer,
-		},
-		["_outer_half"] = {
-			mesh = "moreblocks_slope_outer_half.obj",
-			collision_box = box_slope_outer_half,
-			selection_box = box_slope_outer_half,
-		},
-		["_outer_half_raised"] = {
-			mesh = "moreblocks_slope_outer_half_raised.obj",
-			collision_box = box_slope_outer_half_raised,
-			selection_box = box_slope_outer_half_raised,
-		},
-		
---==============================================================
-		
-		["_outer_cut"] = {
-			mesh = "moreblocks_slope_outer_cut.obj",
-			collision_box = box_slope_outer,
-			selection_box = box_slope_outer,
-		},
-		["_outer_cut_half"] = {
-			mesh = "moreblocks_slope_outer_cut_half.obj",
-			collision_box = box_slope_outer_half,
-			selection_box = box_slope_outer_half,
-		},
-		["_outer_cut_half_raised"] = {
-			mesh = "moreblocks_slope_outer_cut_half_raised.obj",
-			collision_box = box_slope_outer_half_raised,
-			selection_box = box_slope_outer_half_raised,
-		},
-		["_cut"] = {
-			mesh = "moreblocks_slope_cut.obj",
-			collision_box = box_slope_outer,
-			selection_box = box_slope_outer,
-		},
-	}
+	--==============================================================
+
+	["_inner"] = {
+		mesh = "moreblocks_slope_inner.obj",
+		collision_box = box_slope_inner,
+		selection_box = box_slope_inner,
+	},
+	["_inner_half"] = {
+		mesh = "moreblocks_slope_inner_half.obj",
+		collision_box = box_slope_inner_half,
+		selection_box = box_slope_inner_half,
+	},
+	["_inner_half_raised"] = {
+		mesh = "moreblocks_slope_inner_half_raised.obj",
+		collision_box = box_slope_inner_half_raised,
+		selection_box = box_slope_inner_half_raised,
+	},
+
+	--==============================================================
+
+	["_inner_cut"] = {
+		mesh = "moreblocks_slope_inner_cut.obj",
+		collision_box = box_slope_inner,
+		selection_box = box_slope_inner,
+	},
+	["_inner_cut_half"] = {
+		mesh = "moreblocks_slope_inner_cut_half.obj",
+		collision_box = box_slope_inner_half,
+		selection_box = box_slope_inner_half,
+	},
+	["_inner_cut_half_raised"] = {
+		mesh = "moreblocks_slope_inner_cut_half_raised.obj",
+		collision_box = box_slope_inner_half_raised,
+		selection_box = box_slope_inner_half_raised,
+	},
+
+	--==============================================================
+
+	["_outer"] = {
+		mesh = "moreblocks_slope_outer.obj",
+		collision_box = box_slope_outer,
+		selection_box = box_slope_outer,
+	},
+	["_outer_half"] = {
+		mesh = "moreblocks_slope_outer_half.obj",
+		collision_box = box_slope_outer_half,
+		selection_box = box_slope_outer_half,
+	},
+	["_outer_half_raised"] = {
+		mesh = "moreblocks_slope_outer_half_raised.obj",
+		collision_box = box_slope_outer_half_raised,
+		selection_box = box_slope_outer_half_raised,
+	},
+
+	--==============================================================
 
+	["_outer_cut"] = {
+		mesh = "moreblocks_slope_outer_cut.obj",
+		collision_box = box_slope_outer,
+		selection_box = box_slope_outer,
+	},
+	["_outer_cut_half"] = {
+		mesh = "moreblocks_slope_outer_cut_half.obj",
+		collision_box = box_slope_outer_half,
+		selection_box = box_slope_outer_half,
+	},
+	["_outer_cut_half_raised"] = {
+		mesh = "moreblocks_slope_outer_cut_half_raised.obj",
+		collision_box = box_slope_outer_half_raised,
+		selection_box = box_slope_outer_half_raised,
+	},
+	["_cut"] = {
+		mesh = "moreblocks_slope_cut.obj",
+		collision_box = box_slope_outer,
+		selection_box = box_slope_outer,
+	},
+}
+
+function stairsplus:register_slope_alias(modname_old, subname_old, modname_new, subname_new)
+	local defs = stairsplus.copytable(slopes_defs)
+	for alternate, def in pairs(defs) do
+		minetest.register_alias(modname_old .. ":slope_" .. subname_old .. alternate, modname_new .. ":slope_" .. subname_new .. alternate)
+	end
+end
+
+function stairsplus:register_slope_alias_force(modname_old, subname_old, modname_new, subname_new)
+	local defs = stairsplus.copytable(slopes_defs)
+	for alternate, def in pairs(defs) do
+		minetest.register_alias_force(modname_old .. ":slope_" .. subname_old .. alternate, modname_new .. ":slope_" .. subname_new .. alternate)
+	end
+end
+
+function stairsplus:register_slope(modname, subname, recipeitem, fields)
+	local defs = stairsplus.copytable(slopes_defs)
 	local desc = S("%s Slope"):format(fields.description)
 	for alternate, def in pairs(defs) do
 		for k, v in pairs(fields) do
diff --git a/stairsplus/stairs.lua b/stairsplus/stairs.lua
index ee8075f..6609466 100644
--- a/stairsplus/stairs.lua
+++ b/stairsplus/stairs.lua
@@ -20,92 +20,107 @@ function register_stair(modname, subname, recipeitem, groups, images, descriptio
 	})
 end
 
-function stairsplus:register_stair(modname, subname, recipeitem, fields)
-	local defs = {
-		[""] = {
-			node_box = {
-				type = "fixed",
-				fixed = {
-					{-0.5, -0.5, -0.5, 0.5, 0, 0.5},
-					{-0.5, 0, 0, 0.5, 0.5, 0.5},
-				},
+local stairs_defs = {
+	[""] = {
+		node_box = {
+			type = "fixed",
+			fixed = {
+				{-0.5, -0.5, -0.5, 0.5, 0, 0.5},
+				{-0.5, 0, 0, 0.5, 0.5, 0.5},
 			},
 		},
-		["_half"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {
-					{-0.5, -0.5, -0.5, 0, 0, 0.5},
-					{-0.5, 0, 0, 0, 0.5, 0.5},
-				},
+	},
+	["_half"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {
+				{-0.5, -0.5, -0.5, 0, 0, 0.5},
+				{-0.5, 0, 0, 0, 0.5, 0.5},
 			},
 		},
-		["_right_half" ]= {
-			node_box = {
-				type = "fixed",
-				fixed = {
-					{0, -0.5, -0.5, 0.5, 0, 0.5},
-					{0, 0, 0, 0.5, 0.5, 0.5},
-				},
+	},
+	["_right_half" ]= {
+		node_box = {
+			type = "fixed",
+			fixed = {
+				{0, -0.5, -0.5, 0.5, 0, 0.5},
+				{0, 0, 0, 0.5, 0.5, 0.5},
 			},
 		},
-		["_inner"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {
-					{-0.5, -0.5, -0.5, 0.5, 0, 0.5},
-					{-0.5, 0, 0, 0.5, 0.5, 0.5},
-					{-0.5, 0, -0.5, 0, 0.5, 0},
-				},
+	},
+	["_inner"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {
+				{-0.5, -0.5, -0.5, 0.5, 0, 0.5},
+				{-0.5, 0, 0, 0.5, 0.5, 0.5},
+				{-0.5, 0, -0.5, 0, 0.5, 0},
 			},
 		},
-		["_outer"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {
-					{-0.5, -0.5, -0.5, 0.5, 0, 0.5},
-					{-0.5, 0, 0, 0, 0.5, 0.5},
-				},
+	},
+	["_outer"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {
+				{-0.5, -0.5, -0.5, 0.5, 0, 0.5},
+				{-0.5, 0, 0, 0, 0.5, 0.5},
 			},
 		},
-		["_alt"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {
-					{-0.5, -0.5, -0.5, 0.5, 0, 0},
-					{-0.5, 0, 0, 0.5, 0.5, 0.5},
-				},
+	},
+	["_alt"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {
+				{-0.5, -0.5, -0.5, 0.5, 0, 0},
+				{-0.5, 0, 0, 0.5, 0.5, 0.5},
 			},
 		},
-		["_alt_1"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {
-					{-0.5, -0.0625, -0.5, 0.5, 0, 0},
-					{-0.5, 0.4375, 0, 0.5, 0.5, 0.5},
-				},
+	},
+	["_alt_1"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {
+				{-0.5, -0.0625, -0.5, 0.5, 0, 0},
+				{-0.5, 0.4375, 0, 0.5, 0.5, 0.5},
 			},
 		},
-		["_alt_2"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {
-					{-0.5, -0.125, -0.5, 0.5, 0, 0},
-					{-0.5, 0.375, 0, 0.5, 0.5, 0.5},
-				},
+	},
+	["_alt_2"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {
+				{-0.5, -0.125, -0.5, 0.5, 0, 0},
+				{-0.5, 0.375, 0, 0.5, 0.5, 0.5},
 			},
 		},
-		["_alt_4"] = {
-			node_box = {
-				type = "fixed",
-				fixed = {
-					{-0.5, -0.25, -0.5, 0.5, 0, 0},
-					{-0.5, 0.25, 0, 0.5, 0.5, 0.5},
-				},
+	},
+	["_alt_4"] = {
+		node_box = {
+			type = "fixed",
+			fixed = {
+				{-0.5, -0.25, -0.5, 0.5, 0, 0},
+				{-0.5, 0.25, 0, 0.5, 0.5, 0.5},
 			},
 		},
-	}
+	},
+}
+
+function stairsplus:register_stair_alias(modname_old, subname_old, modname_new, subname_new)
+	local defs = stairsplus.copytable(stairs_defs)
+	for alternate, def in pairs(defs) do
+		minetest.register_alias(modname_old .. ":stair_" .. subname_old .. alternate, modname_new .. ":stair_" .. subname_new .. alternate)
+	end
+end
+
+function stairsplus:register_stair_alias_force(modname_old, subname_old, modname_new, subname_new)
+	local defs = stairsplus.copytable(stairs_defs)
+	for alternate, def in pairs(defs) do
+		minetest.register_alias_force(modname_old .. ":stair_" .. subname_old .. alternate, modname_new .. ":stair_" .. subname_new .. alternate)
+	end
+end
 
+function stairsplus:register_stair(modname, subname, recipeitem, fields)
+	local defs = stairsplus.copytable(stairs_defs)
 	local desc = S("%s Stairs"):format(fields.description)
 	for alternate, def in pairs(defs) do
 		for k, v in pairs(fields) do
@@ -127,7 +142,7 @@ function stairsplus:register_stair(modname, subname, recipeitem, fields)
 	circular_saw.known_nodes[recipeitem] = {modname, subname}
 
 	-- Some saw-less recipes:
-	
+
 	minetest.register_craft({
 		output = modname .. ":stair_" .. subname .. " 8",
 		recipe = {
@@ -145,67 +160,67 @@ function stairsplus:register_stair(modname, subname, recipeitem, fields)
 			{recipeitem, recipeitem, recipeitem},
 		},
 	})
-	
+
 	minetest.register_craft({
 		type = "shapeless",
 		output = modname .. ":stair_" .. subname,
 		recipe = {modname .. ":panel_" .. subname, modname .. ":slab_" .. subname},
 	})
-	
+
 	minetest.register_craft({
 		type = "shapeless",
 		output = modname .. ":stair_" .. subname,
 		recipe = {modname .. ":panel_" .. subname, modname .. ":panel_" .. subname, modname .. ":panel_" .. subname},
 	})
-	
+
 	minetest.register_craft({
 		type = "shapeless",
 		output = modname .. ":stair_" .. subname .. "_outer",
 		recipe = {modname .. ":micro_" .. subname, modname .. ":slab_" .. subname},
 	})
-	
+
 	minetest.register_craft({
 		type = "shapeless",
 		output = modname .. ":stair_" .. subname .. "_half",
 		recipe = {modname .. ":micro_" .. subname, modname .. ":micro_" .. subname, modname .. ":micro_" .. subname},
 	})
-	
+
 	minetest.register_craft({
 		type = "shapeless",
 		output = modname .. ":stair_" .. subname .. "_half",
 		recipe = {modname .. ":panel_" .. subname, modname .. ":micro_" .. subname},
 	})
-	
+
 	minetest.register_craft({
 		type = "shapeless",
 		output = modname .. ":stair_" .. subname .. "_right_half",
 		recipe = {modname .. ":stair_" .. subname .. "_half"},
 	})
-	
+
 	minetest.register_craft({
 		type = "shapeless",
 		output = modname .. ":stair_" .. subname,
 		recipe = {modname .. ":micro_" .. subname, modname .. ":micro_" .. subname, modname .. ":micro_" .. subname, modname .. ":micro_" .. subname, modname .. ":micro_" .. subname, modname .. ":micro_" .. subname},
 	})
-	
+
 	minetest.register_craft({
 		type = "shapeless",
 		output = modname .. ":stair_" .. subname .. "_inner",
 		recipe = {modname .. ":micro_" .. subname, modname .. ":micro_" .. subname, modname .. ":micro_" .. subname, modname .. ":micro_" .. subname, modname .. ":micro_" .. subname, modname .. ":micro_" .. subname, modname .. ":micro_" .. subname},
 	})
-	
+
 	minetest.register_craft({
 		type = "shapeless",
 		output = modname .. ":stair_" .. subname .. "_outer",
 		recipe = {modname .. ":micro_" .. subname, modname .. ":micro_" .. subname, modname .. ":micro_" .. subname, modname .. ":micro_" .. subname, modname .. ":micro_" .. subname},
 	})
-	
+
 	minetest.register_craft({
 		type = "shapeless",
 		output = modname .. ":stair_" .. subname,
 		recipe = {modname .. ":panel_" .. subname, modname .. ":panel_" .. subname, modname .. ":panel_" .. subname},
 	})
-	
+
 	minetest.register_craft({ -- See mirrored variation of the recipe below.
 		output = modname .. ":stair_" .. subname .. "_alt",
 		recipe = {
@@ -213,7 +228,7 @@ function stairsplus:register_stair(modname, subname, recipeitem, fields)
 			{""                            , modname .. ":panel_" .. subname},
 		},
 	})
-	
+
 	minetest.register_craft({ -- Mirrored variation of the recipe above.
 		output = modname .. ":stair_" .. subname .. "_alt",
 		recipe = {