Added base of money mod

- Added mod without /money command, and with a basic configuration

mods/money/minetest-money/README.md

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+Minetest mod : money
+====================
+
+This mod adds commerce in Minetest.
+
+Commands for players (requires "money" privilege) :
+/money — gets the balance of your account
+/money pay <account> <amount> — transfers <amount> money to <account>
+
+Commands for administrators (requires "money_admin" privilege) :
+/money <account> — gets balance of <account>
+/money set <account> <amount> — sets balance of <account> in <amount> money
+/money inc <account> <amount> — increases <amount> money to balance of <account>
+/money dec <account> <amount> — decreases <amount> money from balance of <account>
+/money take <account> <amount> — takes off <amount> money from balance of <account>
+
+Also, this mod adds 2 kinds of shops:
+- Simple shop
+- Admin shop (no recipe)
+
+This can be found in:
+  https://github.com/kotolegokot/minetest-mod-money
+
+License of source code
+-----------------------------
+Copyright (C) 2012 kotolegokot, Oleg Matveev <gkotolegokot@gmail.com>
+- Modified by kilbith and nerzhul (2015)
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+License of textures
+--------------------------
+WTFPL (kilbith)

mods/money/minetest-money/README.txt

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+Minetest mod : money
+====================
+
+This mod adds commerce in Minetest.
+
+Commands for players (requires "money" privilege) :
+/money — gets the balance of your account
+/money pay <account> <amount> — transfers <amount> money to <account>
+
+Commands for administrators (requires "money_admin" privilege) :
+/money <account> — gets balance of <account>
+/money set <account> <amount> — sets balance of <account> in <amount> money
+/money inc <account> <amount> — increases <amount> money to balance of <account>
+/money dec <account> <amount> — decreases <amount> money from balance of <account>
+/money take <account> <amount> — takes off <amount> money from balance of <account>
+
+Also, this mod adds 2 kinds of shops:
+- Simple shop
+- Admin shop (no recipe)
+
+This can be found in:
+  https://github.com/kotolegokot/minetest-mod-money
+
+License of source code
+-----------------------------
+Copyright (C) 2012 kotolegokot, Oleg Matveev <gkotolegokot@gmail.com>
+- Modified by kilbith and nerzhul (2015)
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+License of textures
+--------------------------
+WTFPL (kilbith)

mods/money/minetest-money/depends.txt

@@ -0,0 +1,2 @@
+default
+itemframes?

mods/money/minetest-money/hud.lua

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+money.hud = {}
+
+function money.get_money_string(name)
+	return "Account : " .. CURRENCY_PREFIX .. money.get_money(name) -- use CURRENCY_POSTFIX for the lettered currency
+end
+
+function money.hud_add(name)
+	local player = minetest.get_player_by_name(name)
+
+	money.hud[name] = player:hud_add({
+		hud_elem_type = "text",
+		name = "Current money",
+		number = 0xFFFFFF,
+		position = {x=1, y=1},
+		offset = {x=-8, y=-8},
+		text = money.get_money_string(name),
+		scale = {x=200, y=60},
+		alignment = {x=-1.2, y=-1},
+	})
+end
+
+function money.hud_change(name)
+	local player = minetest.get_player_by_name(name)
+	player:hud_change(money.hud[name], "text", money.get_money_string(name))
+end

mods/money/minetest-money/init.lua

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+--[[
+	Mod by Kotolegokot and Xiong (2012-2013)
+	Rev. kilbith and nerzhul (2015)
+]]
+
+money = {}
+
+dofile(minetest.get_modpath("money") .. "/settings.txt") -- Loading settings.
+dofile(minetest.get_modpath("money") .. "/hud.lua") -- Account display in HUD.
+
+local accounts = {}
+local input = io.open(minetest.get_worldpath() .. "/accounts", "r")
+if input then
+	accounts = minetest.deserialize(input:read("*l"))
+	io.close(input)
+end
+
+function money.save_accounts()
+	local output = io.open(minetest.get_worldpath() .. "/accounts", "w")
+	output:write(minetest.serialize(accounts))
+	io.close(output)
+end
+function money.set_money(name, amount)
+	accounts[name].money = amount
+	if money.hud[name] ~= nil then
+		money.hud_change(name)
+	end
+	money.save_accounts()
+end
+function money.get_money(name)
+	return accounts[name].money
+end
+function money.exist(name)
+	return accounts[name] ~= nil
+end
+
+local save_accounts = money.save_accounts
+local set_money = money.set_money
+local get_money = money.get_money
+local exist = money.exist
+
+minetest.register_on_joinplayer(function(player)
+	local name = player:get_player_name()
+	if not exist(name) then
+		local input = io.open(minetest.get_worldpath() .. "/money_" .. name .. ".txt") --For compatible with old versions.
+		if input then
+			local n = input:read("*n")
+			io.close(input)
+			accounts[name] = {money = n}
+			os.remove(minetest.get_worldpath() .. "/money_" .. name .. ".txt")
+			save_accounts()
+		else
+			accounts[name] = {money = INITIAL_MONEY}
+		end
+	end
+	money.hud_add(name)
+end)
+
+minetest.register_on_leaveplayer(function(player)
+	local name = player:get_player_name()
+	money.hud[name] = nil
+end)
+
+minetest.register_privilege("money", "Can use /money [pay <account> <amount>] command")
+minetest.register_privilege("money_admin", {
+	description = "Can use /money <account> | take/set/inc/dec <account> <amount>",
+	give_to_singleplayer = false,
+})
+
+--[[minetest.register_chatcommand("money", {
+	privs = {money=true},
+	params = "[<account> | pay/take/set/inc/dec <account> <amount>]",
+	description = "Operations with money",
+	func = function(name, param)
+		if param == "" then --/money
+			minetest.chat_send_player(name, "My money account : " .. CURRENCY_PREFIX .. get_money(name) .. CURRENCY_POSTFIX)
+			return true
+		end
+		local m = string.split(param, " ")
+		local param1, param2, param3 = m[1], m[2], m[3]
+		if param1 and not param2 then --/money <account>
+			if minetest.get_player_privs(name)["money_admin"] then
+				if exist(param1) then
+					minetest.chat_send_player(name, "Account of player '" .. param1 .. "' : " .. CURRENCY_PREFIX .. get_money(param1) .. CURRENCY_POSTFIX)
+				else
+					minetest.chat_send_player(name, "\"" .. param1 .. "\" account don't exist.")
+				end
+			else
+				minetest.chat_send_player(name, "You don't have permission to run this command (missing privilege: money_admin)")
+			end
+			return true
+		end
+		if param1 and param2 and param3 then --/money pay/take/set/inc/dec <account> <amount>
+			if param1 == "pay" or param1 == "take" or param1 == "set" or param1 == "inc" or param1 == "dec" then
+				if exist(param2) then
+					if tonumber(param3) then
+						if tonumber(param3) >= 0 then
+							param3 = tonumber(param3)
+							if param1 == "pay" then
+								if get_money(name) >= param3 then
+									set_money(param2, get_money(param2) + param3)
+									set_money(name, get_money(name) - param3)
+									minetest.chat_send_player(param2, name .. " sent you " .. CURRENCY_PREFIX .. param3 .. CURRENCY_POSTFIX .. ".")
+									minetest.chat_send_player(name, param2 .. " took your " .. CURRENCY_PREFIX .. param3 .. CURRENCY_POSTFIX .. ".")
+								else
+									minetest.chat_send_player(name, "You don't have " .. CURRENCY_PREFIX .. param3 - get_money(name) .. CURRENCY_POSTFIX .. ".")
+								end
+								return true
+							end
+							if minetest.get_player_privs(name)["money_admin"] then
+								if param1 == "take" then
+									if get_money(param2) >= param3 then
+										set_money(param2, get_money(param2) - param3)
+										set_money(name, get_money(name) + param3)
+										minetest.chat_send_player(param2, name .. " took your " .. CURRENCY_PREFIX .. param3 .. CURRENCY_POSTFIX .. ".")
+										minetest.chat_send_player(name, "You took " .. param2 .. "'s " .. CURRENCY_PREFIX .. param3 .. CURRENCY_POSTFIX .. ".")
+									else
+										minetest.chat_send_player(name, "Player named \""..param2.."\" do not have enough " .. CURRENCY_PREFIX .. param3 - get_money(player) .. CURRENCY_POSTFIX .. ".")
+									end
+								elseif param1 == "set" then
+									set_money(param2, param3)
+									minetest.chat_send_player(name, param2 .. " " .. CURRENCY_PREFIX .. param3 .. CURRENCY_POSTFIX)
+								elseif param1 == "inc" then
+									set_money(param2, get_money(param2) + param3)
+									minetest.chat_send_player(name, param2 .. " " .. CURRENCY_PREFIX .. get_money(param2) .. CURRENCY_POSTFIX)
+								elseif param1 == "dec" then
+									if get_money(param2) >= param3 then
+										set_money(param2, get_money(param2) - param3)
+										minetest.chat_send_player(name, param2 .. " " .. CURRENCY_PREFIX .. get_money(param2) .. CURRENCY_POSTFIX)
+									else
+										minetest.chat_send_player(name, "Player named \""..param2.."\" don't have enough " .. CURRENCY_PREFIX .. param3 - get_money(player) .. CURRENCY_POSTFIX .. ".")
+									end
+								end
+							else
+								minetest.chat_send_player(name, "You don't have permission to run this command (missing privilege: money_admin)")
+							end
+						else
+							minetest.chat_send_player(name, "You must specify a positive amount.")
+						end
+					else
+						minetest.chat_send_player(name, "The amount must be a number.")
+					end
+				else
+					minetest.chat_send_player(name, "\"" .. param2 .. "\" account don't exist.")
+				end
+				return true
+			end
+		end
+		minetest.chat_send_player(name, "Invalid parameters (see /help money)")
+	end,
+})]]
+
+local function has_shop_privilege(meta, player)
+	return player:get_player_name() == meta:get_string("owner") or minetest.get_player_privs(player:get_player_name())["money_admin"]
+end
+
+minetest.register_node("money:shop", {
+	description = "Shop",
+	tiles = {"shop.png"},
+	groups = {snappy=2,choppy=2,oddly_breakable_by_hand=2},
+	sounds = default.node_sound_wood_defaults(),
+	paramtype2 = "facedir",
+	after_place_node = function(pos, placer)
+	local meta = minetest.get_meta(pos)
+	meta:set_string("owner", placer:get_player_name())
+		meta:set_string("infotext", "Untuned Shop (owned by " .. placer:get_player_name() .. ")")
+	end,
+	on_construct = function(pos)
+		local meta = minetest.get_meta(pos)
+		meta:set_string("formspec", "size[6,5]"..default.gui_bg..default.gui_bg_img..
+			"field[0.256,0.5;6,1;shopname;Name of your shop;]"..
+			"label[-0.025,1.03;Trade Type]"..
+			"dropdown[-0.025,1.45;2.5,1;action;Sell,Buy,Buy and Sell;]"..
+			"field[2.7,1.7;3.55,1;amount;Trade lot quantity (1-99);]"..
+			"field[0.256,2.85;6,1;nodename;Node name to trade (eg. default:mese);]"..
+			"field[0.256,4;3,1;costbuy;Buying price (per lot);]"..
+			"field[3.25,4;3,1;costsell;Selling price (per lot);]"..
+			"button_exit[2,4.5;2,1;button;Tune]")
+		meta:set_string("infotext", "Untuned Shop")
+		meta:set_string("owner", "")
+		local inv = meta:get_inventory()
+		inv:set_size("main", 32)
+		meta:set_string("form", "yes")
+	end,
+
+	can_dig = function(pos, player)
+		local meta = minetest.get_meta(pos);
+		local inv = meta:get_inventory()
+		return inv:is_empty("main") and (meta:get_string("owner") == player:get_player_name() or minetest.get_player_privs(player:get_player_name())["money_admin"])
+	end,
+	allow_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
+		local meta = minetest.get_meta(pos)
+		if not has_shop_privilege(meta, player) then
+			minetest.log("action", player:get_player_name().." tried to access a shop belonging to "..
+			meta:get_string("owner").." at "..
+			minetest.pos_to_string(pos))
+			return 0
+		end
+		return count
+	end,
+	allow_metadata_inventory_put = function(pos, listname, index, stack, player)
+		local meta = minetest.get_meta(pos)
+		if not has_shop_privilege(meta, player) then
+			minetest.log("action", player:get_player_name().." tried to access a shop belonging to "..
+			meta:get_string("owner").." at "..
+			minetest.pos_to_string(pos))
+			return 0
+		end
+		return stack:get_count()
+	end,
+	allow_metadata_inventory_take = function(pos, listname, index, stack, player)
+		local meta = minetest.get_meta(pos)
+		if not has_shop_privilege(meta, player) then
+			minetest.log("action", player:get_player_name()..
+					" tried to access a shop belonging to "..
+					meta:get_string("owner").." at "..
+					minetest.pos_to_string(pos))
+			return 0
+		end
+		return stack:get_count()
+	end,
+	on_metadata_inventory_move = function(pos, from_list, from_index, to_list, to_index, count, player)
+		minetest.log("action", player:get_player_name().." moves stuff in shop at "..minetest.pos_to_string(pos))
+	end,
+	on_metadata_inventory_put = function(pos, listname, index, stack, player)
+		minetest.log("action", player:get_player_name().." moves stuff to shop at "..minetest.pos_to_string(pos))
+	end,
+	on_metadata_inventory_take = function(pos, listname, index, count, player)
+		minetest.log("action", player:get_player_name().." takes stuff from shop at "..minetest.pos_to_string(pos))
+	end,
+	on_receive_fields = function(pos, formname, fields, sender)
+		local meta = minetest.get_meta(pos)
+		if meta:get_string("form") == "yes" then
+			if fields.shopname ~= "" and minetest.registered_items[fields.nodename] and tonumber(fields.amount) and tonumber(fields.amount) >= 1 and tonumber(fields.amount) <= 99 and (meta:get_string("owner") == sender:get_player_name() or minetest.get_player_privs(sender:get_player_name())["money_admin"]) then
+				if fields.action == "Sell" then
+					if not tonumber(fields.costbuy) then
+						return
+					end
+					if not (tonumber(fields.costbuy) >= 0) then
+						return
+					end
+				end
+				if fields.action == "Buy" then
+					if not tonumber(fields.costsell) then
+						return
+					end
+					if not (tonumber(fields.costsell) >= 0) then
+						return
+					end
+				end
+				if fields.action == "Buy and Sell" then
+					if not tonumber(fields.costbuy) then
+						return
+					end
+					if not (tonumber(fields.costbuy) >= 0) then
+						return
+					end
+					if not tonumber(fields.costsell) then
+						return
+					end
+					if not (tonumber(fields.costsell) >= 0) then
+						return
+					end
+				end
+				local s, ss
+				if fields.action == "Sell" then
+					s = " sell "
+					ss = "button[1,4.5;2,1;buttonsell;Sell("..fields.costbuy..")]"
+				elseif fields.action == "Buy" then
+					s = " buy "
+					ss = "button[1,4.5;2,1;buttonbuy;Buy("..fields.costsell..")]"
+				else
+					s = " buy and sell "
+					ss = "button[1,4.5;2,1;buttonbuy;Buy("..fields.costsell..")]" .. "button[5,4.5;2,1;buttonsell;Sell("..fields.costbuy..")]"
+				end
+				local meta = minetest.get_meta(pos)
+				meta:set_string("formspec", "size[8,9.35;]"..default.gui_bg..default.gui_bg_img..
+					"list[context;main;0,0;8,4;]"..
+					"label[1.5,4;You can"..s..fields.amount.." "..fields.nodename.."]"..
+						ss..
+					"list[current_player;main;0,5.5;8,4;]")
+				meta:set_string("shopname", fields.shopname)
+				meta:set_string("action", fields.action)
+				meta:set_string("nodename", fields.nodename)
+				meta:set_string("amount", fields.amount)
+				meta:set_string("costbuy", fields.costbuy)
+				meta:set_string("costsell", fields.costsell)
+				meta:set_string("infotext", "Shop \"" .. fields.shopname .. "\" (owned by " .. meta:get_string("owner") .. ")")
+				meta:set_string("form", "no")
+			end
+		elseif fields["buttonbuy"] then
+			local sender_name = sender:get_player_name()
+			local inv = meta:get_inventory()
+			local sender_inv = sender:get_inventory()
+			if not inv:contains_item("main", meta:get_string("nodename") .. " " .. meta:get_string("amount")) then
+				minetest.chat_send_player(sender_name, "Not enough goods in the shop.")
+				return true
+			elseif not sender_inv:room_for_item("main", meta:get_string("nodename") .. " " .. meta:get_string("amount")) then
+				minetest.chat_send_player(sender_name, "Not enough space in your inventory.")
+				return true
+			elseif get_money(sender_name) - tonumber(meta:get_string("costsell")) < 0 then
+				minetest.chat_send_player(sender_name, "You don't have enough money.")
+				return true
+			elseif not exist(meta:get_string("owner")) then
+				minetest.chat_send_player(sender_name, "The owner's account does not currently exist; try again later.")
+				return true
+			end
+			set_money(sender_name, get_money(sender_name) - meta:get_string("costsell"))
+			set_money(meta:get_string("owner"), get_money(meta:get_string("owner")) + meta:get_string("costsell"))
+			sender_inv:add_item("main", meta:get_string("nodename") .. " " .. meta:get_string("amount"))
+			inv:remove_item("main", meta:get_string("nodename") .. " " .. meta:get_string("amount"))
+			minetest.chat_send_player(sender_name, "You bought " .. meta:get_string("amount") .. " " .. meta:get_string("nodename") .. " at a price of " .. CURRENCY_PREFIX .. meta:get_string("costsell") .. CURRENCY_POSTFIX .. ".")
+		elseif fields["buttonsell"] then
+			local sender_name = sender:get_player_name()
+			local inv = meta:get_inventory()
+			local sender_inv = sender:get_inventory()
+			if not sender_inv:contains_item("main", meta:get_string("nodename") .. " " .. meta:get_string("amount")) then
+				minetest.chat_send_player(sender_name, "You do not have enough product.")
+				return true
+			elseif not inv:room_for_item("main", meta:get_string("nodename") .. " " .. meta:get_string("amount")) then
+				minetest.chat_send_player(sender_name, "Not enough space in the shop.")
+				return true
+			elseif get_money(meta:get_string("owner")) - meta:get_string("costbuy") < 0 then
+				minetest.chat_send_player(sender_name, "The buyer is not enough money.")
+				return true
+			elseif not exist(meta:get_string("owner")) then
+				minetest.chat_send_player(sender_name, "The owner's account does not currently exist; try again later.")
+				return true
+			end
+			set_money(sender_name, get_money(sender_name) + meta:get_string("costbuy"))
+			set_money(meta:get_string("owner"), get_money(meta:get_string("owner")) - meta:get_string("costbuy"))
+			sender_inv:remove_item("main", meta:get_string("nodename") .. " " .. meta:get_string("amount"))
+			inv:add_item("main", meta:get_string("nodename") .. " " .. meta:get_string("amount"))
+			minetest.chat_send_player(sender_name, "You sold " .. meta:get_string("amount") .. " " .. meta:get_string("nodename") .. " at a price of " .. CURRENCY_PREFIX .. meta:get_string("costbuy") .. CURRENCY_POSTFIX .. ".")
+		end
+	end,
+})
+
+minetest.register_craft({
+	output = "money:shop",
+	recipe = {
+		{"default:wood", "default:wood", "default:wood"},
+		{"default:wood", "default:mese", "default:wood"},
+		{"default:wood", "default:wood", "default:wood"},
+	},
+})
+
+--Admin shop.
+minetest.register_node("money:admin_shop", {
+	description = "Admin Shop",
+	tiles = {"admin_shop.png"},
+	groups = {snappy=2,choppy=2,oddly_breakable_by_hand=2},
+	sounds = default.node_sound_wood_defaults(),
+	paramtype2 = "facedir",
+	on_construct = function(pos)
+		local meta = minetest.get_meta(pos)
+		meta:set_string("infotext", "Untuned Admin Shop")
+		meta:set_string("formspec", "size[6,3.75]"..default.gui_bg..default.gui_bg_img..
+			"label[-0.025,-0.2;Trade Type]"..
+			"dropdown[-0.025,0.25;2.5,1;action;Sell,Buy,Buy and Sell;]"..
+			"field[2.7,0.48;3.55,1;amount;Trade lot quantity (1-99);]"..
+			"field[0.256,1.65;5.2,1;nodename;Node name to trade (eg. default:mese);]"..
+			"item_image[5,1.25;1,1;default:diamond]" ..
+			"field[0.256,2.75;3,1;costbuy;Buying price (per lot);]"..
+			"field[3.25,2.75;3,1;costsell;Selling price (per lot);]"..
+			"button_exit[2,3.25;2,1;button;Proceed]")
+		meta:set_string("form", "yes")
+	end,
+	can_dig = function(pos,player)
+		return minetest.get_player_privs(player:get_player_name())["money_admin"]
+	end,
+	on_receive_fields = function(pos, formname, fields, sender)
+		local meta = minetest.get_meta(pos)
+		if meta:get_string("form") == "yes" then
+			if minetest.registered_items[fields.nodename] and tonumber(fields.amount) and tonumber(fields.amount) >= 1 and tonumber(fields.amount) <= 99 and (meta:get_string("owner") == sender:get_player_name() or minetest.get_player_privs(sender:get_player_name())["money_admin"]) then
+				if fields.action == "Sell" then
+					if not tonumber(fields.costbuy) then
+						return
+					end
+					if not (tonumber(fields.costbuy) >= 0) then
+						return
+					end
+				end
+				if fields.action == "Buy" then
+					if not tonumber(fields.costsell) then
+						return
+					end
+					if not (tonumber(fields.costsell) >= 0) then
+						return
+					end
+				end
+				if fields.action == "Buy and Sell" then
+					if not tonumber(fields.costbuy) then
+						return
+					end
+					if not (tonumber(fields.costbuy) >= 0) then
+						return
+					end
+					if not tonumber(fields.costsell) then
+						return
+					end
+					if not (tonumber(fields.costsell) >= 0) then
+						return
+					end
+				end
+				local s, ss
+				if fields.action == "Sell" then
+					s = " sell "
+					ss = "button[1,0.5;2,1;buttonsell;Sell("..fields.costbuy..")]"
+				elseif fields.action == "Buy" then
+					s = " buy "
+					ss = "button[1,0.5;2,1;buttonbuy;Buy("..fields.costsell..")]"
+				else
+					s = " buy and sell "
+					ss = "button[1,0.5;2,1;buttonbuy;Buy("..fields.costsell..")]" .. "button[5,0.5;2,1;buttonsell;Sell("..fields.costbuy..")]"
+				end
+				local meta = minetest.get_meta(pos)
+				meta:set_string("formspec", "size[8,5.5;]"..default.gui_bg..default.gui_bg_img..
+					"label[0.256,0;You can"..s..fields.amount.." "..fields.nodename.."]"..
+					ss..
+					"list[current_player;main;0,1.5;8,4;]")
+				meta:set_string("nodename", fields.nodename)
+				meta:set_string("amount", fields.amount)
+				meta:set_string("costbuy", fields.costsell)
+				meta:set_string("costsell", fields.costbuy)
+				meta:set_string("infotext", "Admin Shop")
+				meta:set_string("form", "no")
+			end
+		elseif fields["buttonbuy"] then
+			local sender_name = sender:get_player_name()
+			local sender_inv = sender:get_inventory()
+			if not sender_inv:room_for_item("main", meta:get_string("nodename") .. " " .. meta:get_string("amount")) then
+				minetest.chat_send_player(sender_name, "In your inventory is not enough space.")
+			return true
+			elseif get_money(sender_name) - tonumber(meta:get_string("costbuy")) < 0 then
+				minetest.chat_send_player(sender_name, "You do not have enough money.")
+			return true
+			end
+			set_money(sender_name, get_money(sender_name) - meta:get_string("costbuy"))
+			sender_inv:add_item("main", meta:get_string("nodename") .. " " .. meta:get_string("amount"))
+			minetest.chat_send_player(sender_name, "You bought " .. meta:get_string("amount") .. " " .. meta:get_string("nodename") .. " at a price of " .. CURRENCY_PREFIX .. meta:get_string("costbuy") .. CURRENCY_POSTFIX .. ".")
+		elseif fields["buttonsell"] then
+			local sender_name = sender:get_player_name()
+			local sender_inv = sender:get_inventory()
+			if not sender_inv:contains_item("main", meta:get_string("nodename") .. " " .. meta:get_string("amount")) then
+				minetest.chat_send_player(sender_name, "You don't have enough product.")
+				return true
+			end
+			set_money(sender_name, get_money(sender_name) + meta:get_string("costsell"))
+			sender_inv:remove_item("main", meta:get_string("nodename") .. " " .. meta:get_string("amount"))
+			minetest.chat_send_player(sender_name, "You sold " .. meta:get_string("amount") .. " " .. meta:get_string("nodename") .. " at a price of " .. CURRENCY_PREFIX .. meta:get_string("costsell") .. CURRENCY_POSTFIX .. ".")
+		end
+	end,
+})

mods/money/minetest-money/settings.txt

@@ -0,0 +1,3 @@
+INITIAL_MONEY = 1000
+CURRENCY_PREFIX = "$"
+CURRENCY_POSTFIX = " dollars"