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

local orientate_dispenser = function(pos, placer)
	-- Not placed by player
	if not placer then return end

	-- Pitch in degrees
	local pitch = placer:get_look_vertical() * (180 / math.pi)

	local node = minetest.get_node(pos)
	if pitch > 55 then
		minetest.swap_node(pos, {name="mcl_dispensers:dispenser_up", param2 = node.param2})
	elseif pitch < -55 then
		minetest.swap_node(pos, {name="mcl_dispensers:dispenser_down", param2 = node.param2})
	end
end

local on_rotate
if minetest.get_modpath("screwdriver") then
	on_rotate = screwdriver.rotate_simple
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)
			local dropnodedef = minetest.registered_nodes[dropnode.name]
			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)
				dropitem:set_count(1)
				local stack_id = stacks[r].stackpos
				local stackdef = stack:get_definition()
				local iname = stack:get_name()
				local igroups = minetest.registered_items[iname].groups

				--[===[ Dispense item ]===]

				-- Hardcoded dispensions --

				-- Armor, mob heads and pumpkins
				if igroups.armor_head or igroups.armor_torso or igroups.armor_legs or igroups.armor_feet then
					local armor_type, armor_slot
					local armor_dispensed = false
					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)
							armor_dispensed = true
						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)
								armor_dispensed = true
							end
						end

						-- Place head or pumpkin as node, if equipping it as armor has failed
						if not armor_dispensed then
							if igroups.head or iname == "mcl_farming:pumpkin_face" then
								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
							end
						end
					end

				-- Spawn Egg
				elseif igroups.spawn_egg then
					-- Spawn mob
					if not dropnodedef.walkable then
						pointed_thing = { above = droppos, under = { x=droppos.x, y=droppos.y-1, z=droppos.z } }
						minetest.add_entity(droppos, stack:get_name())

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

				-- Generalized dispension
				elseif (not dropnodedef.walkable or stackdef._dispense_into_walkable) then
					--[[ _on_dispense(stack, pos, droppos, dropnode, dropdir)
						* stack: Itemstack which is dispense
						* pos: Position of dispenser
						* droppos: Position to which to dispense item
						* dropnode: Node of droppos
						* dropdir: Drop direction

					_dispense_into_walkable: If true, can dispense into walkable nodes
					]]
					if stackdef._on_dispense then
						-- Item-specific dispension (if defined)
						local od_ret = stackdef._on_dispense(dropitem, pos, droppos, dropnode, dropdir)
						if od_ret then
							local newcount = stack:get_count() - 1
							stack:set_count(newcount)
							inv:set_stack("main", stack_id, stack)
							if newcount == 0 then
								inv:set_stack("main", stack_id, od_ret)
							elseif inv:room_for_item("main", od_ret) then
								inv:add_item("main", od_ret)
							else
								minetest.add_item(droppos, dropitem)
							end
						else
							stack:take_item()
							inv:set_stack("main", stack_id, stack)
						end
					else
						-- Drop item otherwise
						minetest.add_item(droppos, dropitem)
						stack:take_item()
						inv:set_stack("main", stack_id, stack)
					end
				end


			end
		end,
		rules = mesecon.rules.alldirs,
	}},
	on_rotate = on_rotate,
}

-- 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: Equipped to players and armor stands, or placed as a block
• 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)
	orientate_dispenser(pos, placer)
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, material_stone=1}

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, material_stone=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
local 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_bows: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_bows: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)

-- Add entry aliases for the Help
if minetest.get_modpath("doc") then
	doc.add_entry_alias("nodes", "mcl_dispensers:dispenser", "nodes", "mcl_dispensers:dispenser_down")
	doc.add_entry_alias("nodes", "mcl_dispensers:dispenser", "nodes", "mcl_dispensers:dispenser_up")
end