craft_table/api.lua

--[[
	Mod Craft Table for Minetest
	Copyright (C) 2020 BrunoMine (https://github.com/BrunoMine)
	
	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <https://www.gnu.org/licenses/>.
	
	API
  ]]


-- Drop residual items from craft list
local function drop_craft(player, pos) 
	local invref = player:get_inventory()
	if not pos then pos = player:get_pos() end
	local size = invref:get_size("craft")
	for i = 1, size do
		local item = invref:get_stack("craft", i)
		if item ~= nil then 
			minetest.env:add_item({x = pos.x + (((math.random(1, 70)/100)-0.35)), y = pos.y+1, z = pos.z + (((math.random(1, 70)/100)-0.35))}, item)
		end
		invref:set_stack("craft", i, '')
	end
end

-- Formspec for craft table
local craft_table_form = 
	"size[8,8.3]"..
	default.gui_bg..
	default.gui_bg_img..
	default.gui_slots..
	"list[current_player;main;0,4.25;8,1;]"..
	"list[current_player;main;0,5.5;8,3;8]"..
	"list[current_player;craft;1.75,0.5;3,3;]"..
	"image[4.85,1.45;1,1;gui_furnace_arrow_bg.png^[transformR270]"..
	"list[current_player;craftpreview;5.75,1.5;1,1;]"..
	default.get_hotbar_bg(0,4.25)

-- On_rightclick callback for craft tables
craft_table.on_rightclick = function(pos, node, player)
	local meta = player:get_meta()
	meta:set_string("craft_table:craft_table_pos", minetest.serialize(pos))
	meta:set_string("craft_table:craft_table_node", node.name)
	meta:set_string("craft_table:craft_table_grid", "3x3")
	minetest.show_formspec(player:get_player_name(), "craft_table:craft_table", craft_table_form)
	drop_craft(player)
end

-- Clear metadata when exit from craft table formspec
minetest.register_on_player_receive_fields(function(player, formname, fields)
	if formname == "craft_table:craft_table" and fields.quit then
		local meta = player:get_meta()
		drop_craft(player, minetest.deserialize(meta:get_string("craft_table:craft_table_pos")))
		meta:set_string("craft_table:craft_table_pos", "")
	end
end)

-- Check craft table
local check_craft_table = function(player)
	local meta = player:get_meta()
	if meta:get_string("craft_table:craft_table_pos") == ""
		or meta:get_string("craft_table:craft_table_node") == ""
	then
		return false
	end
	
	-- Current node
	local node = minetest.get_node(minetest.deserialize(meta:get_string("craft_table:craft_table_pos")))
	
	-- Check node
	if node.name ~= meta:get_string("craft_table:craft_table_node") then
		return false
	end
	
	return true
end


minetest.register_allow_player_inventory_action(function(player, action, inventory, inventory_info)

	if action == "move" then
		
		local meta = player:get_meta()
		-- Avoid put itens at extra slots from 2x2 craft grid
		if inventory_info.to_list == "craft" 
			and meta:get_string("craft_table:craft_table_grid") == "2x2"
		and (
				inventory_info.to_index == 3
				or inventory_info.to_index == 6
				or inventory_info.to_index == 7
				or inventory_info.to_index == 8
				or inventory_info.to_index == 9
			)
		then
			return 0
		end
		
		-- Close formspec when table is destroyed
		if (inventory_info.to_list == "craft" or inventory_info.from_list == "craft")
			and meta:get_string("craft_table:craft_table_grid") ~= "2x2"
			and check_craft_table(player) == false 
		then
			minetest.close_formspec(player:get_player_name(), "craft_table:craft_table")
			drop_craft(player)
			return 0
		end
		
	end
	return 99
end)

minetest.register_craft_predict(function(itemstack, player, old_craft_grid, craft_inv)
	if player:get_meta():get_string("craft_table:craft_table_grid") ~= "2x2"
		and check_craft_table(player) == false 
	then
		return ''
	end
	return itemstack
end)

-- Modify default inventory
if sfinv then
	local override_table = {}
	
	-- Change default craft grid from sfinv inventory to 2x2
	if craft_table.simple_craft_grid == true then
		override_table.get = function(self, player, context)
			return sfinv.make_formspec(player, context, [[
				list[current_player;craft;2,1;2,1;0]
				list[current_player;craft;2,2;2,1;3]
				list[current_player;craftpreview;5,1.5;1,1;]
				image[4,1.5;1,1;gui_furnace_arrow_bg.png^[transformR270]
				listring[current_player;main]
				listring[current_player;craft]
				image[0,5.2;1,1;gui_hb_bg.png]
				image[1,5.2;1,1;gui_hb_bg.png]
				image[2,5.2;1,1;gui_hb_bg.png]
				image[3,5.2;1,1;gui_hb_bg.png]
				image[4,5.2;1,1;gui_hb_bg.png]
				image[5,5.2;1,1;gui_hb_bg.png]
				image[6,5.2;1,1;gui_hb_bg.png]
				image[7,5.2;1,1;gui_hb_bg.png]
			]], true)
		end
	end
	
	override_table.on_enter = function(self, player, context)
		player:get_meta():set_string("craft_table:craft_table_grid", "2x2")
		drop_craft(player)
	end
	-- Drop crafting items if not in crafting page
	override_table.on_leave = function(self, player, context)
		drop_craft(player)
	end
	override_table.on_player_receive_fields = function(self, player, context, fields)
		if fields.quit then
			drop_craft(player)
		end
	end
	
	sfinv.override_page("sfinv:crafting", override_table)
	
	minetest.register_on_joinplayer(function(player)
		player:get_meta():set_string("craft_table:craft_table_grid", "2x2")
	end)
end