Subversion Repositories fei

-- Finally Enough Items

-- Copyright (C) 2026 mrkubax10

-- This program is free software: you can redistribute it and/or modify

-- it under the terms of the GNU Affero General Public License as published by

-- the Free Software Foundation, either version 3 of the License, or

-- (at your option) any later version.

-- This program is distributed in the hope that it will be useful,

-- but WITHOUT ANY WARRANTY; without even the implied warranty of

-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

-- GNU Affero General Public License for more details.

-- You should have received a copy of the GNU Affero General Public License

-- along with this program. If not, see <https://www.gnu.org/licenses/>.

local prev_inventory_formspec_values={}

local update_elapsed = 0

-- Extracts next number from string from the beginning

local function scan_number(str)

	local begin_index = 0

	local end_index = 0

	local collect = false

	local index = 1

	for ch in string.gmatch(str, ".") do

		if collect then

			if not string.match(ch, "%d") and ch~="." then

				end_index = index

				break

			end

		else

			if string.match(ch, "%d") then

				begin_index = index

				collect = true

			end

		end

		index = index+1

	end

	if begin_index==end_index then

		return 0, str

	end

	return tonumber(string.sub(str, begin_index, end_index-1)), string.sub(str, end_index+1)

end

local function parse_formspec_information(formspec)

	local width = 0

	local height = 0

	local _, size_end = string.find(formspec, "size%[")

	if size_end then

		local size_pattern = string.sub(formspec, size_end)

		width, size_pattern = scan_number(size_pattern)

		height, size_pattern = scan_number(size_pattern)

	end

	local version = 1

	local _, version_end = string.find(formspec, "formspec_version%[")

	if version_end then

		local version_pattern = string.sub(formspec, version_end)

		version, _ = scan_number(version_pattern)

	end

	local real_coordinates = false

	local _, real_coordinates_end = string.find(formspec, "real_coordinates%[")

	if real_coordinates_end then

		-- Check for true keyword

		local real_coordinates_pattern = string.sub(formspec, real_coordinates_end, real_coordinates_end+4)

		real_coordinates = real_coordinates_pattern=="true"

	end

	return {

		width = width,

		height = height,

		legacy_coordinates = version==1 and not real_coordinates

	}

end

local function determine_anchor(window_info, inv_formspec_info)

	local element_spacing = inv_formspec_info.legacy_coordinates and 0.25 or 0

	local formspec_center_x = inv_formspec_info.width/2

	local formspec_center_y = inv_formspec_info.height/2

	local window_center_x = window_info.max_formspec_size.x/2

	local window_center_y = window_info.max_formspec_size.y/2

	return {

		x = formspec_center_x-element_spacing+window_center_x-window_center_x*element_spacing,

		y = formspec_center_y-element_spacing-window_center_y+window_center_y*element_spacing

	}

end

local function create_items_view(player, prev_inventory_formspec)

	local window_info = minetest.get_player_window_information(player:get_player_name())

	-- There is a brief moment when the player is still joining where get_player_window_information returns nil

	if not window_info then

		return ""

	end

	local inv_formspec_info = parse_formspec_information(player:get_formspec_prepend()..prev_inventory_formspec)

	local items_anchor = determine_anchor(window_info, inv_formspec_info)

	local formspec = {

		"style_type[label;noclip=true]",

		"style_type[image_button;noclip=true]",

		string.format("image_button[%f,%f;1,1;default_furnace_front.png;button1;]", items_anchor.x, items_anchor.y),

	}

	return table.concat(formspec, "")

end

local function update_if_needed(player, prev_inventory_formspec)

	player:set_inventory_formspec(prev_inventory_formspec..create_items_view(player, prev_inventory_formspec))

end

-- This is a kind of hacky way of registering in on_mods_loaded to make sure that our on_joinplayer handler is called last

minetest.register_on_mods_loaded(function()

	minetest.register_on_joinplayer(function(player)

		prev_inventory_formspec_values[player:get_player_name()] = player:get_inventory_formspec()

	end)

end)

minetest.register_on_leaveplayer(function(player)

	prev_inventory_formspec_values[player:get_player_name()] = nil

end)

minetest.register_on_player_receive_fields(function(player, formname, fields)

	-- If player inventory formspec was somehow updated, then change the previous formspec value too

	if formname~="" then

		return

	end

	prev_inventory_formspec_values[player:get_player_name()] = player:get_inventory_formspec()

	update_if_needed(player, player:get_inventory_formspec())

end)

minetest.register_globalstep(function(dtime)

	update_elapsed = update_elapsed+dtime

	-- TODO: Introduce option which will allow to adjust item list updating frequency

	if update_elapsed<0.5 then

		return

	end

	update_elapsed = 0

	local players = minetest.get_connected_players()

	for _,player in ipairs(players) do

		local prev_inventory_formspec = prev_inventory_formspec_values[player:get_player_name()]

		if prev_inventory_formspec then

			update_if_needed(player, prev_inventory_formspec)

		end

	end

end)

minetest.register_chatcommand("formspec",{

	func=function(name)

		local window_info = minetest.get_player_window_information(name)

		local formspec={

			--"formspec_version[2]",

			"size[5,5]",

			"style_type[button;noclip=true]",

			"button[0,0;1,1;button1;]",

			"button[1,0;1,1;button2;]",

			"button[2,0;1,1;button2;]",

			"button[2.25,1;1,1;button2;]"

			--string.format("button[%f,0;1,1;button1;]", window_info.max_formspec_size.x/2+2.5)

		}

		minetest.show_formspec(name, "fei:formspec", table.concat(formspec, ""))

	end

})