auto-combine tabletops with legs

If the player places table legs, and then places a tabletop while
pointing at the legs (from any side), the table and legs will
automatically be combined into a single node that can then have
something placed on top like usual.

This also gets rid of those redundant "utility" table nodes, since
these have always basically just been a set of legs, and a copy
of the small square wood table.  Now they're merged into the above
feature, and aliased as appropriate.

Tecccccccccchhnically, wood legs should only have been allowed to
combine with wooden tabletops...  then I googled around a bit,
and found a number of glass tables with wooden legs that were
surprisingly similar to the in-game versions.

homedecor_tables/misc.lua

@@ -2,25 +2,58 @@
 
 local S = minetest.get_translator("homedecor_tables")
 
-local materials = {
+-- Various kinds of table legs
+
+local table_shapes = {"large_square", "small_square", "small_round"}
+
+local tabletop_materials = {
 	{ "glass",
-		S("Small square glass table"),
-		S("Small round glass table"),
-		S("Large glass table piece"),
+		S("Small square glass tabletop"),
+		S("Small round glass tabletop"),
+		S("Large glass tabletop piece"),
 	},
 	{ "wood",
-		S("Small square wooden table"),
-		S("Small round wooden table"),
-		S("Large wooden table piece"),
+		S("Small square wooden tabletop"),
+		S("Small round wooden tabletop"),
+		S("Large wooden tabletop piece"),
 	}
 }
 
+leg_materials = {
+	{ "brass",          S("brass") },
+	{ "wrought_iron",   S("wrought iron") },
+	{ "wood",           S("wood") }
+}
+
+for _, t in ipairs(leg_materials) do
+	local name, desc = unpack(t)
+	homedecor.register("table_legs_"..name, {
+		description = S("Table Legs (@1)", desc),
+		drawtype = "plantlike",
+		tiles = {"homedecor_table_legs_"..name..".png"},
+		inventory_image = "homedecor_table_legs_"..name..".png",
+		wield_image = "homedecor_table_legs_"..name..".png",
+		walkable = false,
+		groups = {snappy=3},
+		sounds = default.node_sound_wood_defaults(),
+		selection_box = {
+			type = "fixed",
+			fixed = { -0.37, -0.5, -0.37, 0.37, 0.5, 0.37 }
+		},
+	})
+end
+
+minetest.register_alias("homedecor:utility_table_legs", "homedecor:table_legs_wood")
+minetest.register_alias("homedecor:utility_table_top",  "homedecor:wood_table_small_square")
+
+-- table tops and combined tables
+
 local tables_cbox = {
 	type = "fixed",
 	fixed = { -0.5, -0.5,    -0.5,  0.5,    -0.4375, 0.5 },
 }
 
-for i, mat in ipairs(materials) do
+for i, mat in ipairs(tabletop_materials) do
 	local m, small_s, small_r, large = unpack(mat)
 	local s
 
@@ -30,138 +63,67 @@ for i, mat in ipairs(materials) do
 		s = default.node_sound_wood_defaults()
 	end
 
--- small square tables
+	for _, shape in ipairs(table_shapes) do
 
-	homedecor.register(m.."_table_small_square", {
-		description = small_s,
-		mesh = "homedecor_table_small_square.obj",
-		tiles = { 'homedecor_'..m..'_table_small_square.png' },
-		wield_image = 'homedecor_'..m..'_table_small_square_inv.png',
-		inventory_image = 'homedecor_'..m..'_table_small_square_inv.png',
-		groups = { snappy = 3 },
-		sounds = s,
-		selection_box = tables_cbox,
-		collision_box = tables_cbox,
-		on_place = minetest.rotate_node
-	})
+		homedecor.register(m.."_table_"..shape, {
+			description = shape.." "..m.." tabletop",
+			mesh = "homedecor_table_"..shape..".obj",
+			tiles = {
+				'homedecor_'..m..'_table_'..shape..'.png',
+				'homedecor_'..m..'_table_edges.png',
+				'homedecor_blanktile.png',
+				'homedecor_blanktile.png',
+				'homedecor_blanktile.png',
+			},
+			wield_image = 'homedecor_'..m..'_table_'..shape..'_inv.png',
+			groups = { snappy = 3 },
+			sounds = s,
+			selection_box = tables_cbox,
+			collision_box = tables_cbox,
+			on_place = function(itemstack, placer, pointed_thing)
+				local player_name = placer:get_player_name()
+				if minetest.is_protected(pointed_thing.under, player_name) then return end
+				local node = minetest.get_node(pointed_thing.under)
+				if string.find(node.name, "homedecor:table_legs") then
+					local newname = string.format("homedecor:%s_table_%s_with_%s_legs",
+						m, shape, string.sub(node.name, 22))
+					minetest.set_node(pointed_thing.under, {name = newname})
+					if not creative.is_enabled_for(player_name) then
+						itemstack:take_item()
+						return itemstack
+					end
+				else
+					return minetest.rotate_node(itemstack, placer, pointed_thing)
+				end
+			end
+		})
 
--- small round tables
+		for _, l in ipairs(leg_materials) do
+			local leg_mat, desc = unpack(l)
 
-	homedecor.register(m..'_table_small_round', {
-		description = small_r,
-		mesh = "homedecor_table_small_round.obj",
-		tiles = { "homedecor_"..m.."_table_small_round.png" },
-		wield_image = 'homedecor_'..m..'_table_small_round_inv.png',
-		inventory_image = 'homedecor_'..m..'_table_small_round_inv.png',
-		groups = { snappy = 3 },
-		sounds = s,
-		selection_box = tables_cbox,
-		collision_box = tables_cbox,
-		on_place = minetest.rotate_node
-	})
-
--- Large square table pieces
-
-	homedecor.register(m..'_table_large', {
-		description = large,
-		tiles = {
-			'homedecor_'..m..'_table_large_tb.png',
-			'homedecor_'..m..'_table_large_tb.png',
-			'homedecor_'..m..'_table_large_edges.png',
-			'homedecor_'..m..'_table_large_edges.png',
-			'homedecor_'..m..'_table_large_edges.png',
-			'homedecor_'..m..'_table_large_edges.png'
-		},
-		wield_image = 'homedecor_'..m..'_table_large_inv.png',
-		inventory_image = 'homedecor_'..m..'_table_large_inv.png',
-		groups = { snappy = 3 },
-		sounds = s,
-		node_box = {
-			type = "fixed",
-			fixed = { -0.5, -0.5, -0.5, 0.5, -0.4375, 0.5 },
-		},
-		selection_box = tables_cbox,
-		on_place = minetest.rotate_node
-	})
+			homedecor.register(string.format("%s_table_%s_with_%s_legs", m, shape, leg_mat), {
+				description = string.format("%s %s table with %s legs", shape, m, leg_mat),
+				mesh = "homedecor_table_"..shape..".obj",
+				tiles = {
+					'homedecor_blanktile.png',
+					'homedecor_blanktile.png',
+					'homedecor_'..m..'_table_'..shape..'.png',
+					'homedecor_'..m..'_table_edges.png',
+					"homedecor_table_legs_"..leg_mat..".png",
+				},
+				groups = { snappy = 3 },
+				sounds = s,
+			})
+		end
+	end
 
 	minetest.register_alias('homedecor:'..m..'_table_large_b', 'homedecor:'..m..'_table_large')
 	minetest.register_alias('homedecor:'..m..'_table_small_square_b', 'homedecor:'..m..'_table_small_square')
 	minetest.register_alias('homedecor:'..m..'_table_small_round_b', 'homedecor:'..m..'_table_small_round')
+	minetest.register_alias('homedecor:'..m..'_table_large', 'homedecor:'..m..'_table_large_square')
 
 end
 
--- other tables
-
-homedecor.register("utility_table_top", {
-	description = S("Utility Table"),
-	tiles = {
-		'homedecor_utility_table_tb.png',
-		'homedecor_utility_table_tb.png',
-		'homedecor_utility_table_edges.png',
-		'homedecor_utility_table_edges.png',
-		'homedecor_utility_table_edges.png',
-		'homedecor_utility_table_edges.png'
-	},
-	wield_image = 'homedecor_utility_table_tb.png',
-	inventory_image = 'homedecor_utility_table_tb.png',
-	groups = { snappy = 3 },
-	sounds = default.node_sound_wood_defaults(),
-	paramtype2 = "wallmounted",
-	node_box = {
-		type = "wallmounted",
-		wall_bottom = { -0.5, -0.5,    -0.5,  0.5,   -0.4375, 0.5 },
-		wall_top =    { -0.5,  0.4375, -0.5,  0.5,    0.5,    0.5 },
-		wall_side =   { -0.5, -0.5,    -0.5, -0.4375, 0.5,    0.5 },
-	},
-	selection_box = {
-		type = "wallmounted",
-		wall_bottom = { -0.5, -0.5,    -0.5,  0.5,   -0.4375, 0.5 },
-		wall_top =    { -0.5,  0.4375, -0.5,  0.5,    0.5,    0.5 },
-		wall_side =   { -0.5, -0.5,    -0.5, -0.4375, 0.5,    0.5 },
-	},
-})
-
--- Various kinds of table legs
-
--- local above
-materials = {
-	{ "brass",          S("brass") },
-	{ "wrought_iron",   S("wrought iron") },
-}
-
-for _, t in ipairs(materials) do
-local name, desc = unpack(t)
-homedecor.register("table_legs_"..name, {
-	description = S("Table Legs (@1)", desc),
-	drawtype = "plantlike",
-	tiles = {"homedecor_table_legs_"..name..".png"},
-	inventory_image = "homedecor_table_legs_"..name..".png",
-	wield_image = "homedecor_table_legs_"..name..".png",
-	walkable = false,
-	groups = {snappy=3},
-	sounds = default.node_sound_wood_defaults(),
-	selection_box = {
-		type = "fixed",
-		fixed = { -0.37, -0.5, -0.37, 0.37, 0.5, 0.37 }
-	},
-})
-end
-
-homedecor.register("utility_table_legs", {
-	description = S("Legs for Utility Table"),
-	drawtype = "plantlike",
-	tiles = { 'homedecor_utility_table_legs.png' },
-	inventory_image = 'homedecor_utility_table_legs_inv.png',
-	wield_image = 'homedecor_utility_table_legs.png',
-	walkable = false,
-	groups = { snappy = 3 },
-	sounds = default.node_sound_wood_defaults(),
-	selection_box = {
-		type = "fixed",
-		fixed = { -0.37, -0.5, -0.37, 0.37, 0.5, 0.37 }
-	},
-})
-
 -- crafting
 
 minetest.register_craft( {
@@ -266,7 +228,20 @@ minetest.register_craft({
         burntime = 30,
 })
 
-
+for _, shape in ipairs (table_shapes) do
+	for _, leg in ipairs(leg_materials) do
+		for _, mat in ipairs(tabletop_materials) do
+			minetest.register_craft({
+				output = "homedecor:"..mat[1].."_table_"..shape.."_with_"..leg[1].."_legs",
+				type = "shapeless",
+				recipe = {
+					"homedecor:"..mat[1].."_table_"..shape,
+					"homedecor:table_legs_"..leg[1]
+				},
+			})
+		end
+	end
+end
 
 -- recycling
 
@@ -329,3 +304,4 @@ minetest.register_craft({
 		"homedecor:wood_table_large"
 	}
 })
+

homedecor_tables/mod.conf

@@ -1,3 +1,4 @@
 name = homedecor_tables
 description = Homedecor mod: tables
 depends = homedecor_common, default, basic_materials
+optional_depends = creative

homedecor_tables/models/homedecor_table_large_square.obj

@@ -0,0 +1,107 @@
+# Blender v2.83.5 OBJ File: 'homedecor table with legs.blend'
+# www.blender.org
+o Cube_Cube.001
+v -0.500000 -0.500000 0.500000
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+vn 0.0000 0.0000 -1.0000
+vn 0.7071 0.0000 -0.7071
+vn 0.7071 0.0000 0.7071
+g Cube_Cube.001_top-bottom
+s off
+f 14/1/1 2/2/1 10/3/1 1/4/1
+f 11/5/2 13/6/2 15/7/2 12/8/2
+g Cube_Cube.001_edges
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+f 12/15/5 15/16/5 1/17/5 10/18/5
+f 13/19/6 11/20/6 2/21/6 14/22/6
+g Cube_Cube.001_top-bot_with_legs
+f 20/23/2 3/24/2 4/25/2 18/26/2
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homedecor_tables/models/homedecor_table_small_square.obj

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-vt 0.971 0.015
-vt 0.5 0.015
-vt 0.471 0.971
-vt 0.471 0.529
-vt 0.485 0.515
-vt 0.485 0.985
+# Blender v2.83.5 OBJ File: 'homedecor small square table with legs.blend'
+# www.blender.org
+o Cube_Cube.001
+v -0.500000 -0.500000 0.500000
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 s off
-f 1/1 2/2 3/3 4/4
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+f 9/1/1 2/2/1 8/3/1 1/4/1
+f 22/5/2 26/6/2 27/7/2 24/8/2
+f 24/8/3 27/7/3 28/9/3 23/10/3
+f 22/5/4 24/8/4 23/10/4 21/11/4
+f 26/6/5 22/5/5 21/11/5 25/12/5
+f 27/7/6 26/6/6 25/12/6 28/9/6
+g Cube_Cube.001_edges
+f 23/13/7 28/14/7 1/15/7 8/16/7
+f 25/17/8 21/18/8 2/19/8 9/20/8
+f 25/21/9 9/22/9 1/23/9 28/24/9
+f 21/25/10 23/26/10 8/27/10 2/28/10
+g Cube_Cube.001_top-bot_with_legs
+f 10/29/1 11/30/1 12/31/1 3/32/1
+f 31/33/2 17/34/2 20/35/2 29/36/2
+f 31/33/6 29/36/6 30/37/6 32/38/6
+f 20/35/4 17/34/4 18/39/4 19/40/4
+f 17/34/3 31/33/3 32/38/3 18/39/3
+f 29/36/5 20/35/5 19/40/5 30/37/5
+g Cube_Cube.001_edges_with_legs
+f 32/41/7 12/42/7 11/43/7 18/44/7
+f 19/45/8 10/46/8 3/47/8 30/48/8
+f 12/49/9 32/50/9 30/51/9 3/52/9
+f 19/53/10 18/54/10 11/55/10 10/56/10
+g Cube_Cube.001_legs
+f 13/57/11 15/58/11 16/59/11 14/60/11
+f 4/61/12 6/62/12 7/63/12 5/64/12