VoxeLibre/mods/ITEMS/REDSTONE/mcl_dispensers/init.lua

--[[ This mod registers 3 nodes:
- One node for the horizontal-facing dispensers (mcl_dispensers:dispenser)
- One node for the upwards-facing dispensers (mcl_dispenser:dispenser_up)
- One node for the downwards-facing dispensers (mcl_dispenser:dispenser_down)

3 node definitions are needed because of the way the textures are defined.
All node definitions share a lot of code, so this is the reason why there
are so many weird tables below.
]]

-- For after_place_node
local setup_dispenser = function(pos)
	-- Set formspec and inventory
	local form = "size[9,8.75]"..
	"background[-0.19,-0.25;9.41,9.49;crafting_inventory_9_slots.png]"..
	mcl_vars.inventory_header..
	"image[3,-0.2;5,0.75;mcl_dispensers_fnt_dispenser.png]"..
	"list[current_player;main;0,4.5;9,3;9]"..
	"list[current_player;main;0,7.74;9,1;]"..
	"list[current_name;main;3,0.5;3,3;]"..
	"listring[current_name;main]"..
	"listring[current_player;main]"
	local meta = minetest.get_meta(pos)
	meta:set_string("formspec", form)
	local inv = meta:get_inventory()
	inv:set_size("main", 9)
end

-- Shared core definition table
local dispenserdef = {
	is_ground_content = false,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	after_dig_node = function(pos, oldnode, oldmetadata, digger)
		local meta = minetest.get_meta(pos)
		local meta2 = meta
		meta:from_table(oldmetadata)
		local inv = meta:get_inventory()
		for i=1, inv:get_size("main") do
			local stack = inv:get_stack("main", i)
			if not stack:is_empty() then
				local p = {x=pos.x+math.random(0, 10)/10-0.5, y=pos.y, z=pos.z+math.random(0, 10)/10-0.5}
				minetest.add_item(p, stack)
			end
		end
		meta:from_table(meta2:to_table())
	end,
	_mcl_blast_resistance = 17.5,
	_mcl_hardness = 3.5,
	mesecons = {effector = {
		-- Dispense random item when triggered
		action_on = function (pos, node)
			local meta = minetest.get_meta(pos)
			local inv = meta:get_inventory()
			local droppos, dropdir
			if node.name == "mcl_dispensers:dispenser" then
				dropdir = vector.multiply(minetest.facedir_to_dir(node.param2), -1)
				droppos = vector.add(pos, dropdir)
			elseif node.name == "mcl_dispensers:dispenser_up" then
				dropdir = {x=0, y=1, z=0}
				droppos  = {x=pos.x, y=pos.y+1, z=pos.z}
			elseif node.name == "mcl_dispensers:dispenser_down" then
				dropdir = {x=0, y=-1, z=0}
				droppos  = {x=pos.x, y=pos.y-1, z=pos.z}
			end
			local dropnode = minetest.get_node(droppos)
			-- Do not dispense into solid nodes
			local dropnodedef = minetest.registered_nodes[dropnode.name]
			if dropnodedef.walkable then
				return
			end
			local stacks = {}
			for i=1,inv:get_size("main") do
				local stack = inv:get_stack("main", i)
				if not stack:is_empty() then
					table.insert(stacks, {stack = stack, stackpos = i})
				end
			end
			if #stacks >= 1 then
				local r = math.random(1, #stacks)
				local stack = stacks[r].stack
				local dropitem = ItemStack(stack:get_name())
				local stack_id = stacks[r].stackpos
				local iname = stack:get_name()
				local igroups = minetest.registered_items[iname].groups

				--[===[ Dispense item ]===]
				if iname == "mcl_throwing:arrow" then
					-- Shoot arrow
					local shootpos = vector.add(pos, vector.multiply(dropdir, 0.51))
					local yaw = math.atan2(dropdir.z, dropdir.x) - math.pi/2
					mcl_throwing.shoot_arrow(iname, shootpos, dropdir, yaw, nil, 19, 3)

					stack:take_item()
					inv:set_stack("main", stack_id, stack)

				elseif iname == "mcl_throwing:egg" or iname == "mcl_throwing:snowball" then
					-- Throw egg or snowball
					local shootpos = vector.add(pos, vector.multiply(dropdir, 0.51))
					mcl_throwing.throw(iname, shootpos, dropdir)

					stack:take_item()
					inv:set_stack("main", stack_id, stack)

				elseif iname == "mcl_fire:fire_charge" then
					-- Throw fire charge
					local shootpos = vector.add(pos, vector.multiply(dropdir, 0.51))
					local fireball = minetest.add_entity(shootpos, "mobs_mc:blaze_fireball")
					local ent = fireball:get_luaentity()
					local v = ent.velocity or 1
					fireball:setvelocity(vector.multiply(dropdir, v))
					ent.switch = 1

					stack:take_item()
					inv:set_stack("main", stack_id, stack)

				elseif iname == "mcl_fire:flint_and_steel" then
					-- Ignite air or fire
					if dropnode.name == "air" then
						minetest.add_node(droppos, {name="mcl_fire:fire"})
						if not minetest.setting_getbool("creative_mode") then
							stack:add_wear(65535/65) -- 65 uses
						end
					elseif dropnode.name == "mcl_tnt:tnt" then
						tnt.ignite(droppos)
						if not minetest.setting_getbool("creative_mode") then
							stack:add_wear(65535/65) -- 65 uses
						end
					end

					inv:set_stack("main", stack_id, stack)
				elseif iname == "mcl_tnt:tnt" then
					-- Place and ignite TNT
					if dropnodedef.buildable_to then
						minetest.set_node(droppos, {name = iname})
						tnt.ignite(droppos)

						stack:take_item()
						inv:set_stack("main", stack_id, stack)
					end
				elseif iname == "bucket:bucket_empty" then
					-- Fill empty bucket with liquid or drop bucket if no liquid
					local collect_liquid = false
					local bucket_id
					if dropnode.name == "mcl_core:water_source" then
						collect_liquid = true
						bucket_id = "bucket:bucket_water"
					elseif dropnode.name == "mcl_core:lava_source" then
						collect_liquid = true
						bucket_id = "bucket:bucket_lava"
					end
					if collect_liquid then
						minetest.set_node(droppos, {name="air"})

						-- Fill bucket with liquid and put it back into inventory
						-- if there's still space. If not, drop it.
						stack:take_item()
						inv:set_stack("main", stack_id, stack)

						local new_bucket = ItemStack(bucket_id)
						if inv:room_for_item("main", new_bucket) then
							inv:add_item("main", new_bucket)
						else
							minetest.add_item(droppos, dropitem)
						end
					else
						-- No liquid found: Drop empty bucket
						minetest.add_item(droppos, dropitem)

						stack:take_item()
						inv:set_stack("main", stack_id, stack)
					end
				elseif iname == "bucket:bucket_water" or iname == "bucket:bucket_lava" then
					-- Place water/lava source
					if dropnodedef.buildable_to then
						if iname == "bucket:bucket_water" then
							minetest.set_node(droppos, {name = "mcl_core:water_source"})
						elseif iname == "bucket:bucket_lava" then
							minetest.set_node(droppos, {name = "mcl_core:lava_source"})
						end

						stack:take_item()
						inv:set_stack("main", stack_id, stack)

						if inv:room_for_item("main", "bucket:bucket_empty") then
							inv:add_item("main", "bucket:bucket_empty")
						else
							minetest.add_item(droppos, dropitem)
						end
					end

				elseif igroups.head or igroups.shulker_box or iname == "mcl_farming:pumpkin_face" then
					-- Place head, shulker box, or pumpkin
					if dropnodedef.buildable_to then
						minetest.set_node(droppos, {name = iname, param2 = node.param2})

						stack:take_item()
						inv:set_stack("main", stack_id, stack)
					end

				elseif iname == "mcl_dye:white" then
					-- Apply bone meal, if possible
					if dropnode.name == "air" then
						pointed_thing = { above = droppos, under = { x=droppos.x, y=droppos.y-1, z=droppos.z } }
					else
						pointed_thing = { above = pos, under = droppos }
					end
					local success = mcl_dye.apply_bone_meal(pointed_thing)
					if success then
						stack:take_item()
						inv:set_stack("main", stack_id, stack)
					end

				elseif iname == "mcl_minecarts:minecart" then
					-- Place minecart as entity on rail
					if dropnodedef.groups.rail then
						minetest.add_entity(droppos, "mcl_minecarts:minecart")

					else
						-- Drop item
						minetest.add_item(droppos, dropitem)

					end

					stack:take_item()
					inv:set_stack("main", stack_id, stack)

				elseif igroups.boat then
					local below = {x=droppos.x, y=droppos.y-1, z=droppos.z}
					local belownode = minetest.get_node(below)
					-- Place boat as entity on or in water
					if dropnodedef.groups.water or (dropnode.name == "air" and minetest.registered_nodes[belownode.name].groups.water) then
						minetest.add_entity(droppos, "mcl_boats:boat")
					else
						minetest.add_item(droppos, dropitem)
					end

					stack:take_item()
					inv:set_stack("main", stack_id, stack)

				elseif igroups.armor_head or igroups.armor_torso or igroups.armor_legs or igroups.armor_feet then
					local armor_type, armor_slot
					if igroups.armor_head then
						armor_type = "armor_head"
						armor_slot = 2
					elseif igroups.armor_torso then
						armor_type = "armor_torso"
						armor_slot = 3
					elseif igroups.armor_legs then
						armor_type = "armor_legs"
						armor_slot = 4
					elseif igroups.armor_feet then
						armor_type = "armor_feet"
						armor_slot = 5
					end

					local droppos_below = {x=droppos.x, y=droppos.y-1, z=droppos.z}
					local dropnode_below = minetest.get_node(droppos_below)
					-- Put armor on player or armor stand
					local standpos
					if dropnode.name == "3d_armor_stand:armor_stand" then
						standpos = droppos
					elseif dropnode_below.name == "3d_armor_stand:armor_stand" then
						standpos = droppos_below
					end
					if standpos then
						local dropmeta = minetest.get_meta(standpos)
						local dropinv = dropmeta:get_inventory()
						if dropinv:room_for_item(armor_type, dropitem) then
							dropinv:add_item(armor_type, dropitem)
							--[[ FIXME: For some reason, this function is not called after calling add_item,
							so we call it manually to update the armor stand entity.
							This may need investigation and the following line may be a small hack. ]]
							minetest.registered_nodes["3d_armor_stand:armor_stand"].on_metadata_inventory_put(standpos)
							stack:take_item()
							inv:set_stack("main", stack_id, stack)
						end
					else
						-- Put armor on nearby player
						-- First search for player in front of dispenser (check 2 nodes)
						local objs1 = minetest.get_objects_inside_radius(droppos, 1)
						local objs2 = minetest.get_objects_inside_radius(droppos_below, 1)
						local objs_table = {objs1, objs2}
						local player
						for oi=1, #objs_table do
							local objs_inner = objs_table[oi]
							for o=1, #objs_inner do
								--[[ First player in list is the lucky one. The other player get nothing :-(
								If multiple players are close to the dispenser, it can be a bit
								-- unpredictable on who gets the armor. ]]
								if objs_inner[o]:is_player() then
									player = objs_inner[o]
									break
								end
							end
							if player then
								break
							end
						end
						-- If player found, add armor
						if player then
							local ainv = minetest.get_inventory({type="detached", name=player:get_player_name().."_armor"})
							local pinv = player:get_inventory()
							if ainv:get_stack("armor", armor_slot):is_empty() and pinv:get_stack("armor", armor_slot):is_empty() then
								ainv:set_stack("armor", armor_slot, dropitem)
								pinv:set_stack("armor", armor_slot, dropitem)
								armor:set_player_armor(player)
								armor:update_inventory(player)

								stack:take_item()
								inv:set_stack("main", stack_id, stack)
							end
						end
					end

				elseif igroups.spawn_egg then
					-- Place spawn egg
					if not dropnodedef.walkable then
						pointed_thing = { above = droppos, under = { x=droppos.x, y=droppos.y-1, z=droppos.z } }

						minetest.registered_items[iname].on_place(ItemStack(iname), nil, pointed_thing)

						stack:take_item()
						inv:set_stack("main", stack_id, stack)
					end

				-- TODO: Many other dispenser actions
				else
					-- Drop item
					minetest.add_item(droppos, dropitem)
	
					stack:take_item()
					inv:set_stack("main", stack_id, stack)
				end
			end
		end
	}}
}

-- Horizontal dispenser

local horizontal_def = table.copy(dispenserdef)
horizontal_def.description = "Dispenser"
horizontal_def._doc_items_longdesc = "A dispenser is a block which acts as a redstone component which, when powered with redstone power, dispenses an item. It has a container with 9 inventory slots."
horizontal_def._doc_items_usagehelp = [[Place the dispenser in one of 6 possible directions. The “hole” is where items will fly out of the dispenser. Rightclick the dispenser to access its inventory. Insert the items you wish to dispense. Supply the dispenser with redstone energy once to dispense a single random item.

The dispenser will do different things, depending on the dispensed item:

• Arrows: Are launched
• Eggs and snowballs: Are thrown
• Fire charges: Are fired in a straight line
• Armor: Will be equipped to players and armor stands
• Boats: Are placed on water or are dropped
• Minecart: Are placed on rails or are dropped
• Bone meal: Is applied on the block it is facint
• Empty buckets: Are used to collect a liquid source
• Filled buckets: Are used to place a liquid source
• Heads, pumpkins or shulker boxes: Are placed as a block
• TNT: Is placed and ignited
• Flint and steel: Is used to ignite a fire in air and to ignite TNT
• Spawn eggs: Will summon the mob they contain
• Other items: Are simply dropped]]

horizontal_def.after_place_node = function(pos, placer, itemstack, pointed_thing)
	setup_dispenser(pos)

	-- When placed up and down, convert node to up/down dispenser
	if pointed_thing.above.y < pointed_thing.under.y then
		minetest.swap_node(pos, {name = "mcl_dispensers:dispenser_down"})
	elseif pointed_thing.above.y > pointed_thing.under.y then
		minetest.swap_node(pos, {name = "mcl_dispensers:dispenser_up"})
	end

	-- Else, the normal facedir logic applies
end
horizontal_def.tiles = {
	"default_furnace_top.png", "default_furnace_bottom.png",
	"default_furnace_side.png", "default_furnace_side.png",
	"default_furnace_side.png", "mcl_dispensers_dispenser_front_horizontal.png"
}
horizontal_def.paramtype2 = "facedir"
horizontal_def.groups = {pickaxey=1, container=2}

minetest.register_node("mcl_dispensers:dispenser", horizontal_def)

-- Down dispenser
local down_def = table.copy(dispenserdef)
down_def.description = "Downwards-Facing Dispenser"
down_def.after_place_node = setup_dispenser
down_def.tiles = {
	"default_furnace_top.png", "mcl_dispensers_dispenser_front_vertical.png",
	"default_furnace_side.png", "default_furnace_side.png",
	"default_furnace_side.png", "default_furnace_side.png"
}
down_def.groups = {pickaxey=1, container=2,not_in_creative_inventory=1}
down_def._doc_items_create_entry = false
down_def.drop = "mcl_dispensers:dispenser"
minetest.register_node("mcl_dispensers:dispenser_down", down_def)

-- Up dispenser
-- The up dispenser is almost identical to the down dispenser , it only differs in textures
up_def = table.copy(down_def)
up_def.description = "Upwards-Facing Dispenser"
up_def.tiles = {
	"mcl_dispensers_dispenser_front_vertical.png", "default_furnace_bottom.png",
	"default_furnace_side.png", "default_furnace_side.png",
	"default_furnace_side.png", "default_furnace_side.png"
}
minetest.register_node("mcl_dispensers:dispenser_up", up_def)


minetest.register_craft({
	output = 'mcl_dispensers:dispenser',
	recipe = {
		{"mcl_core:cobble", "mcl_core:cobble", "mcl_core:cobble",},
		{"mcl_core:cobble", "mcl_throwing:bow", "mcl_core:cobble",},
		{"mcl_core:cobble", "mesecons:redstone", "mcl_core:cobble",},
	}
})

-- Only allow crafting if the bow is intact
local check_craft = function(itemstack, player, old_craft_grid, craft_inv)
	if itemstack:get_name() == "mcl_dispensers:dispenser" then
		local bow, id
		for i=1, craft_inv:get_size("craft") do
			local item = craft_inv:get_stack("craft", i)
			if item:get_name() == "mcl_throwing:bow" then
				bow = item
				id = i
				break
			end
		end
		if bow and bow:get_wear() ~= 0 then
			return ""
		end
	end
	return nil
end

minetest.register_on_craft(check_craft)
minetest.register_craft_predict(check_craft)