technic/technic_chests/register.lua

local S
if intllib then
	S = intllib.Getter()
else
	S = function(s) return s end
end

local chest_mark_colors = {
	{"black", S("Black")},
	{"blue", S("Blue")},
	{"brown", S("Brown")},
	{"cyan", S("Cyan")},
	{"dark_green", S("Dark Green")},
	{"dark_grey", S("Dark Grey")},
	{"green", S("Green")},
	{"grey", S("Grey")},
	{"magenta", S("Magenta")},
	{"orange", S("Orange")},
	{"pink", S("Pink")},
	{"red", S("Red")},
	{"violet", S("Violet")},
	{"white", S("White")},
	{"yellow", S("Yellow")},
}


local function colorid_to_postfix(id)
	return chest_mark_colors[id] and "_"..chest_mark_colors[id][1] or ""
end


local function get_color_buttons(coleft, lotop)
	local buttons_string = ""
	for y = 0, 3 do
		for x = 0, 3 do
			local file_name = "technic_colorbutton"..(y * 4 + x)..".png"
			buttons_string = buttons_string.."image_button["
				..(coleft + 0.1 + x * 0.7)..","..(lotop + 0.1 + y * 0.7)
				..";0.8,0.8;"..file_name..";color_button"
				..(y * 4 + x + 1)..";]"
		end
	end
	return buttons_string
end


local function check_color_buttons(pos, meta, chest_name, fields)
	for i = 1, 16 do
		if fields["color_button"..i] then
			technic.swap_node(pos, chest_name..colorid_to_postfix(i))
			meta:set_string("color", i)
			return
		end
	end
end

local function set_formspec(pos, data, page)
	local meta = minetest.get_meta(pos)
	local node = minetest.get_node(pos)
	local formspec = data.base_formspec
	if data.autosort then
		local status = meta:get_int("autosort")
		formspec = formspec.."button["..(data.hileft+2)..","..(data.height+1.1)..";3,0.8;autosort_to_"..(1-status)..";"..S("Auto-sort is %s"):format(status == 1 and S("On") or S("Off")).."]"
	end
	if data.infotext then
		local formspec_infotext = minetest.formspec_escape(meta:get_string("infotext"))
		if page == "main" then
			formspec = formspec.."image_button["..(data.hileft+2.1)..",0.1;0.8,0.8;"
					.."technic_pencil_icon.png;edit_infotext;]"
					.."label["..(data.hileft+3)..",0;"..formspec_infotext.."]"
		elseif page == "edit_infotext" then
			formspec = formspec.."image_button["..(data.hileft+2.1)..",0.1;0.8,0.8;"
					.."technic_checkmark_icon.png;save_infotext;]"
					.."field["..(data.hileft+3.3)..",0.2;4.8,1;"
					.."infotext_box;"..S("Edit chest description:")..";"
					..formspec_infotext.."]"
		end
	end
	if data.color then
		local colorID = meta:get_int("color")
		local colorName
		if chest_mark_colors[colorID] then
			colorName = chest_mark_colors[colorID][2]
		else
			colorName = S("None")
		end
		formspec = formspec.."label["..(data.coleft+0.2)..","..(data.lotop+3)..";"..S("Color Filter: %s"):format(colorName).."]"
	end
	meta:set_string("formspec", formspec)
end

local function sort_inventory(inv)
	local inlist = inv:get_list("main")
	local typecnt = {}
	local typekeys = {}
	for _, st in ipairs(inlist) do
		if not st:is_empty() then
			local n = st:get_name()
			local w = st:get_wear()
			local m = st:get_metadata()
			local k = string.format("%s %05d %s", n, w, m)
			if not typecnt[k] then
				typecnt[k] = {
					name = n,
					wear = w,
					metadata = m,
					stack_max = st:get_stack_max(),
					count = 0,
				}
				table.insert(typekeys, k)
			end
			typecnt[k].count = typecnt[k].count + st:get_count()
		end
	end
	table.sort(typekeys)
	local outlist = {}
	for _, k in ipairs(typekeys) do
		local tc = typecnt[k]
		while tc.count > 0 do
			local c = math.min(tc.count, tc.stack_max)
			table.insert(outlist, ItemStack({
				name = tc.name,
				wear = tc.wear,
				metadata = tc.metadata,
				count = c,
			}))
			tc.count = tc.count - c
		end
	end
	if #outlist > #inlist then return end
	while #outlist < #inlist do
		table.insert(outlist, ItemStack(nil))
	end
	inv:set_list("main", outlist)
end

local function get_receive_fields(name, data)
	local lname = name:lower()
	return function(pos, formname, fields, sender)
		local meta = minetest.get_meta(pos)
		local page = "main"
		if fields.sort or (data.autosort and fields.quit and meta:get_int("autosort") == 1) then
			sort_inventory(meta:get_inventory())
		end
		if fields.edit_infotext then
			page = "edit_infotext"
		end
		if fields.autosort_to_1 then meta:set_int("autosort", 1) end
		if fields.autosort_to_0 then meta:set_int("autosort", 0) end
		if fields.infotext_box then
			meta:set_string("infotext", fields.infotext_box)
		end
		if data.color then
			-- This sets the node
			local nn = "technic:"..lname..(data.locked and "_locked" or "").."_chest"
			check_color_buttons(pos, meta, nn, fields)
		end
		meta:get_inventory():set_size("main", data.width * data.height)
		set_formspec(pos, data, page)
	end
end


function technic.chests:definition(name, data)
	local lname = name:lower()
	name = S(name)
	local d = {}
	for k, v in pairs(data) do d[k] = v end
	data = d

	data.lowidth = 8
	data.ovwidth = math.max(data.lowidth, data.width)
	data.hileft = (data.ovwidth - data.width) / 2
	data.loleft = (data.ovwidth - data.lowidth) / 2
	if data.color then
		if data.lowidth + 3 <= data.ovwidth then
			data.coleft = data.ovwidth - 3
			if data.loleft + data.lowidth > data.coleft then
				data.loleft = data.coleft - data.lowidth
			end
		else
			data.loleft = 0
			data.coleft = data.lowidth
			data.ovwidth = data.lowidth + 3
		end
	end
	data.lotop = data.height + 2
	data.ovheight = data.lotop + 4

	local locked_after_place = nil
	local front = {"technic_"..lname.."_chest_front.png"}
	data.base_formspec = "invsize["..data.ovwidth..","..data.ovheight..";]"..
			"label[0,0;"..S("%s Chest"):format(name).."]"..
			"list[current_name;main;"..data.hileft..",1;"..data.width..","..data.height..";]"..
			"list[current_player;main;"..data.loleft..","..data.lotop..";8,4;]"..
			"background[-0.19,-0.25;"..(data.ovwidth+0.4)..","..(data.ovheight+0.75)..";ui_form_bg.png]"..
			"background["..data.hileft..",1;"..data.width..","..data.height..";technic_"..lname.."_chest_inventory.png]"..
			"background["..data.loleft..","..data.lotop..";8,4;ui_main_inventory.png]"
	if data.sort then
		data.base_formspec = data.base_formspec.."button["..data.hileft..","..(data.height+1.1)..";1,0.8;sort;"..S("Sort").."]"
	end
	if data.color then
		data.base_formspec = data.base_formspec..get_color_buttons(data.coleft, data.lotop)
	end

	if data.locked then
		locked_after_place = function(pos, placer)
			local meta = minetest.get_meta(pos)
			meta:set_string("owner", placer:get_player_name() or "")
			meta:set_string("infotext",
					S("%s Locked Chest (owned by %s)")
					:format(name, meta:get_string("owner")))
		end
		table.insert(front, "technic_"..lname.."_chest_lock_overlay.png")
	end

	local desc
	if data.locked then
		desc = S("%s Locked Chest"):format(name)
	else
		desc = S("%s Chest"):format(name)
	end

	local def = {
		description = desc,
		tiles = {"technic_"..lname.."_chest_top.png", "technic_"..lname.."_chest_top.png",
			"technic_"..lname.."_chest_side.png", "technic_"..lname.."_chest_side.png",
			"technic_"..lname.."_chest_side.png", table.concat(front, "^")},
		paramtype2 = "facedir",
		groups = self.groups,
		tube = self.tube,
		legacy_facedir_simple = true,
		sounds = default.node_sound_wood_defaults(),
		after_place_node = locked_after_place,
		on_construct = function(pos)
			local meta = minetest.get_meta(pos)
			meta:set_string("infotext", S("%s Chest"):format(name))
			set_formspec(pos, data, "main")
			local inv = meta:get_inventory()
			inv:set_size("main", data.width * data.height)
		end,
		can_dig = self.can_dig,
		on_receive_fields = get_receive_fields(name, data),
		on_metadata_inventory_move = self.on_inv_move,
		on_metadata_inventory_put = self.on_inv_put,
		on_metadata_inventory_take = self.on_inv_take,
	}
	if data.locked then
		def.allow_metadata_inventory_move = self.inv_move
		def.allow_metadata_inventory_put = self.inv_put
		def.allow_metadata_inventory_take = self.inv_take
	end
	return def
end

function technic.chests:register(name, data)
	local def = technic.chests:definition(name, data)

	local nn = "technic:"..name:lower()..(data.locked and "_locked" or "").."_chest"
	minetest.register_node(":"..nn, def)

	if data.color then
		local mk_front
		if string.find(def.tiles[6], "%^") then
			mk_front = function (overlay) return def.tiles[6]:gsub("%^", "^"..overlay.."^") end
		else
			mk_front = function (overlay) return def.tiles[6].."^"..overlay end
		end
		for i = 1, 15 do
			local postfix = colorid_to_postfix(i)
			local colordef = {}
			for k, v in pairs(def) do
				colordef[k] = v
			end
			colordef.drop = nn
			colordef.groups = self.groups_noinv
			colordef.tiles = { def.tiles[1], def.tiles[2], def.tiles[3], def.tiles[4], def.tiles[5], mk_front("technic_chest_overlay"..postfix..".png") }
			minetest.register_node(":"..nn..postfix, colordef)
		end
	end

end