Add container group for nodes with inventories

API.md

@@ -86,6 +86,11 @@ These groups are used mostly for informational purposes
 * `eatable`: Item can be *directly* eaten by wielding + left click (`on_use=item_eat`). Rating is the satiation gain
 * `ammo=1`: Item is used as ammo for a weapon
 * `ammo_bow=1`: Item is used as ammo for bows
+* `container`: Node is a container which physically stores items within and has at least 1 inventory
+   * `container=2`: Has one inventory with list name `"main"`. Items can be placed and taken freely
+   * `container=3`: Same as `container=2`, but shulker boxes can not be inserted
+   * `container=4`: Furnace-like, has lists `"src"`, `"fuel"` and `"dst"`
+   * `container=1`: Other/unspecified container type
 
 * `weapon=1`: Item is primarily (!) a weapon
 * `tool=1`: Item is primarily (!) a tool

mods/mcl_chests/init.lua

@@ -28,7 +28,7 @@ minetest.register_node("mcl_chests:chest", {
 		"default_chest_side.png", "default_chest_side.png", "default_chest_front.png"},
 	paramtype2 = "facedir",
 	stack_max = 64,
-	groups = {choppy=2,oddly_breakable_by_hand=2, deco_block=1},
+	groups = {choppy=2,container=2,oddly_breakable_by_hand=2, deco_block=1},
 	is_ground_content = false,
 	sounds = mcl_sounds.node_sound_wood_defaults(),
 	on_construct = function(pos)
@@ -139,7 +139,7 @@ minetest.register_node("mcl_chests:chest_left", {
 	tiles = {"default_chest_top_big.png", "default_chest_top_big.png", "default_chest_side.png",
 		"default_chest_side.png", "default_chest_side_big.png^[transformFX", "default_chest_front_big.png"},
 	paramtype2 = "facedir",
-	groups = {choppy=2,oddly_breakable_by_hand=2,not_in_creative_inventory=1},
+	groups = {choppy=2,container=2,oddly_breakable_by_hand=2,not_in_creative_inventory=1},
 	drop = "mcl_chests:chest",
 	is_ground_content = false,
 	sounds = mcl_sounds.node_sound_wood_defaults(),
@@ -198,7 +198,7 @@ minetest.register_node("mcl_chests:chest_right", {
 	tiles = {"default_chest_top_big.png^[transformFX", "default_chest_top_big.png^[transformFX", "default_chest_side.png",
 		"default_chest_side.png", "default_chest_side_big.png", "default_chest_front_big.png^[transformFX"},
 	paramtype2 = "facedir",
-	groups = {choppy=2,oddly_breakable_by_hand=2,not_in_creative_inventory=1},
+	groups = {choppy=2,container=2,oddly_breakable_by_hand=2,not_in_creative_inventory=1},
 	drop = "mcl_chests:chest",
 	is_ground_content = false,
 	sounds = mcl_sounds.node_sound_wood_defaults(),
@@ -273,6 +273,8 @@ minetest.register_node("mcl_chests:ender_chest", {
 	tiles = {"mcl_chests_ender_chest_top.png", "mcl_chests_ender_chest_bottom.png",
 		"mcl_chests_ender_chest_right.png", "mcl_chests_ender_chest_left.png",
 		"mcl_chests_ender_chest_back.png", "mcl_chests_ender_chest_front.png"},
+	-- Note: The “container” group is missing here because the ender chest does not
+	-- have an inventory on its own
 	groups = {cracky=1, deco_block=1},
 	is_ground_content = false,
 	paramtype = "light",
@@ -335,7 +337,7 @@ for color, desc in pairs(boxtypes) do
 		tiles = {"mcl_chests_"..color.."_shulker_box_top.png", "mcl_chests_"..color.."_shulker_box_bottom.png",
 			"mcl_chests_"..color.."_shulker_box_side.png", "mcl_chests_"..color.."_shulker_box_side.png",
 			"mcl_chests_"..color.."_shulker_box_side.png", "mcl_chests_"..color.."_shulker_box_side.png"},
-		groups = {cracky=2, deco_block=1, shulker_box=1},
+		groups = {cracky=2, container=3, deco_block=1, shulker_box=1},
 		is_ground_content = false,
 		sounds = mcl_sounds.node_sound_stone_defaults(),
 		stack_max = 1,

mods/mcl_furnaces/init.lua

@@ -30,7 +30,7 @@ minetest.register_node("mcl_furnaces:furnace", {
 	paramtype2 = "facedir",
 	is_ground_content = false,
 	stack_max = 64,
-	groups = {cracky=2, deco_block=1},
+	groups = {cracky=2, container=4, deco_block=1},
 	sounds = mcl_sounds.node_sound_stone_defaults(),
 	on_construct = function(pos)
 		local meta = minetest.get_meta(pos)
@@ -96,7 +96,7 @@ minetest.register_node("mcl_furnaces:furnace_active", {
 	is_ground_content = false,
 	light_source = 13,
 	drop = "mcl_furnaces:furnace",
-	groups = {cracky=2, not_in_creative_inventory=1},
+	groups = {cracky=2, container=4, not_in_creative_inventory=1},
 	sounds = mcl_sounds.node_sound_stone_defaults(),
 	on_construct = function(pos)
 		local meta = minetest.get_meta(pos)

mods/mcl_hoppers/init.lua

@@ -15,7 +15,7 @@ local mcl_hoppers_formspec =
 minetest.register_node("mcl_hoppers:hopper", {
 	drop = "mcl_hoppers:hopper_item",
 	description = "Hopper (Node)",
-	groups = {cracky=1,level=2,not_in_creative_inventory=1},
+	groups = {cracky=1,level=2,container=2,not_in_creative_inventory=1},
 	drawtype = "nodebox",
 	paramtype = "light",
 	tiles = {"mcl_hoppers_hopper_inside.png^mcl_hoppers_hopper_top.png", "mcl_hoppers_hopper_outside.png", "mcl_hoppers_hopper_outside.png", "mcl_hoppers_hopper_inside.png", "mcl_hoppers_hopper_outside.png", "mcl_hoppers_hopper_outside.png"},
@@ -74,7 +74,7 @@ minetest.register_node("mcl_hoppers:hopper", {
 minetest.register_node("mcl_hoppers:hopper_side", {
 	description = "Hopper (Side)",
 	drop = "mcl_hoppers:hopper_item",
-	groups = {cracky=1,level=2,not_in_creative_inventory=1},
+	groups = {cracky=1,level=2,container=2,not_in_creative_inventory=1},
 	drawtype = "nodebox",
 	paramtype = "light",
 	paramtype2 = "facedir",

mods/redstone/mcl_dropper/init.lua

@@ -5,7 +5,7 @@ minetest.register_node("mcl_dropper:dropper", {
 		"default_furnace_side.png", "default_furnace_side.png",
 		"default_furnace_side.png", "mcl_dropper_dropper_front_horizontal.png"
 	}, 
-	groups = {cracky=2},
+	groups = {cracky=2,container=2},
 	is_ground_content = false,
 	paramtype2 = "facedir",
 	sounds = mcl_sounds.node_sound_stone_defaults(),