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cauldron1.lua

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+--Brewing Cauldron
+minetest.register_craft({
+	output = '"brewing:magic_cauldron" 1',
+	recipe = {
+		{'default:steel_ingot', '', 'default:steel_ingot'},
+		{'default:steel_ingot', 'brewing:magic_crystal', 'default:steel_ingot'},
+		{'default:steel_ingot', 'default:steel_ingot', 'default:steel_ingot'}
+	}
+})
+
+

commands.lua

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+minetest.register_chatcommand("effect", {
+	params = "none",
+	description = "get effect info",
+	func = function(name, param)
+		minetest.chat_send_player(name, "effects:")
+		local potions_e = brewing.players[name]
+		if potions_e~=nil then
+			for potion_name, val in pairs(potions_e) do
+				minetest.chat_send_player(name, potion_name .. "=" .. val)
+			end
+		end
+	end,
+})

crystal.lua

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+minetest.register_craftitem("brewing:magic_crystal", {
+	description = ("Magic Crystal"),
+	inventory_image = "brewing_magic_crystal.png",
+})
+
+minetest.register_craft({
+	output = '"brewing:magic_crystal" 6',
+	recipe = {
+		{'brewing:magic_gem'}
+	}
+})

effects.lua

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+local S = ...
+
+local function drink_particles(player)
+	local pos = player:get_pos()
+	minetest.add_particlespawner({
+		amount = 20,
+		time = 0.001,
+		minpos = pos,
+		maxpos = pos,
+		minvel = vector.new(-2,-2,-2),
+		maxvel = vector.new(2,2,2),
+		minacc = {x=0, y=0, z=0},
+		maxacc = {x=0, y=0, z=0},
+		minexptime = 1.1,
+		maxexptime = 1.5,
+		minsize = 1,
+		maxsize = 2,
+		collisiondetection = false,
+		vertical = false,
+		texture = "bubble.png",
+		--playername = player:get_player_name()
+	})
+end
+
+--The Engine (Potions/Effects) Part!!!
+
+brewing.effects = {}
+
+brewing.effects.phys_override = function(effect_name, description_name, potion_name, sdata, flags)
+	local def = {
+		on_use = function(itemstack, user, pointed_thing)
+			brewing.make_sound("player", user, "brewing_magic_sound")
+			drink_particles(user)
+			brewing.grant(user, effect_name, potion_name.."_"..flags.type..sdata.type, description_name, sdata.time or 0, flags)
+			itemstack:take_item()
+			return itemstack
+		end,
+		potions = {
+			speed = 0,
+			jump = 0,
+			gravity = 0,
+			tnt = 0,
+			air = 0,
+		},
+	}
+	return def
+end
+
+brewing.effects.fixhp = function(sname, name, fname, sdata, flags)
+	local def = {
+		on_use = function(itemstack, user, pointed_thing)
+			brewing.make_sound("player", user, "brewing_magic_sound")
+			drink_particles(user)
+			for i=0, (sdata.time or 0) do
+				minetest.after(i, function()
+					local hp = user:get_hp()
+					if flags.inv==true then
+						hp = hp - (sdata.hp or 3)
+					else
+						hp = hp + (sdata.hp or 3)
+					end
+					hp = math.min(20, hp)
+					hp = math.max(0, hp)
+					user:set_hp(hp)
+				end)
+			end
+			itemstack:take_item()
+			return itemstack
+		end,
+	}
+	def.mobs = {
+		on_near = def.on_use,
+	}
+	return def
+end
+
+brewing.effects.air = function(sname, name, fname, sdata, flags)
+	local def = {
+		on_use = function(itemstack, user, pointed_thing)
+			brewing.make_sound("player", user, "brewing_magic_sound")
+			drink_particles(user)
+			local potions_e = brewing.players[user:get_player_name()]
+			potions_e.air = potions_e.air + (sdata.time or 0)
+			for i=0, (sdata.time or 0) do
+				minetest.after(i, function(v_user, v_sdata)
+					local br = v_user:get_breath()
+					if flags.inv==true then
+						br = br - (v_sdata.br or 3)
+					else
+						br = br + (v_sdata.br or 3)
+					end
+					br = math.min(11, br)
+					br = math.max(0, br)
+					v_user:set_breath(br)
+					if i==(v_sdata.time or 0) then
+						potions_e.air = potions_e.air - (v_sdata.time or 0)
+					end
+				end, user, sdata)
+			end
+			itemstack:take_item()
+			return itemstack
+		end,
+	}
+	return def
+end
+
+brewing.effects.invisibility = function(sname, name, fname, sdata, flags)
+	local def = {
+		on_use = function(itemstack, user, pointed_thing)
+			brewing.make_sound("player", user, "brewing_magic_sound")
+			drink_particles(user)
+			user:set_nametag_attributes({
+				color = {a = 0, r = 255, g = 255, b = 255}
+			})
+			user:set_properties({
+				visual_size = {x = 0, y = 0},
+			})
+			local user_name = user:get_player_name()
+			minetest.chat_send_player(user_name, S("You are invisible thanks to a invisibility potion."))
+			minetest.after(sdata.time, function(player, player_name)
+				if minetest.get_player_by_name(player_name) then
+					player:set_nametag_attributes({
+						color = {a = 255, r = 255, g = 255, b = 255}
+					})
+					player:set_properties({
+						visual_size = {x = 1, y = 1},
+					})
+					minetest.chat_send_player(player_name, S("You are visible again."))
+				end
+			end, user, user_name)
+			itemstack:take_item()
+			return itemstack
+		end,
+	}
+	return def
+end
+
+brewing.effects.resist_fire = function(sname, name, fname, sdata, flags)
+	local def = {
+		on_use = function(itemstack, user, pointed_thing)
+			brewing.make_sound("player", user, "brewing_magic_sound")
+			drink_particles(user)
+			local user_name = user:get_player_name()
+			brewing.players[user_name]["resist_fire"] = true
+			user:get_meta():set_string("brewing:resist_fire", "true")
+			minetest.chat_send_player(user_name, S("You are able to resist fire thanks to a Resist Fire Potion."))
+			minetest.after(sdata.time, function(player, player_name)
+				if minetest.get_player_by_name(player_name) then
+					brewing.players[player_name]["resist_fire"] = false
+					minetest.chat_send_player(player_name, S("The effect of the Resist Potion has worn off."))
+				end
+			end, user, user_name)
+			itemstack:take_item()
+			return itemstack
+		end,
+	}
+	return def
+end
+
+brewing.effects.teleport = function(sname, name, fname, sdata, flags)
+	local def = {
+		on_use = function(itemstack, user, pointed_thing)
+			brewing.make_sound("player", user, "brewing_magic_sound")
+			local user_name = user:get_player_name()
+			local teleport_pos = brewing.players[user_name]["teleport"]
+			if not teleport_pos then
+				brewing.players[user_name]["teleport"] = user:get_pos()
+				brewing.make_sound("player", user, "brewing_magic_sound")
+				minetest.chat_send_player(user_name, S("Your position was saved for teleport."))
+				drink_particles(user)
+				minetest.after(sdata.time, function(player, player_name)
+					if minetest.get_player_by_name(player_name) and brewing.players[player_name]["teleport"] then
+						brewing.players[player_name]["teleport"] = nil
+						minetest.chat_send_player(player_name, S("The effect of the Teleport Potion has worn off."))
+					end
+				end, user, user_name)
+			else
+				local teleport_node = minetest.get_node_or_nil(teleport_pos)
+				if not teleport_node then
+					minetest.get_voxel_manip():read_from_map(teleport_pos, teleport_pos)
+					teleport_node = minetest.get_node(teleport_pos)
+				end
+				if minetest.registered_nodes[teleport_node.name].drawtype == "airlike" then
+					user:set_pos(teleport_pos)
+					drink_particles(user)
+					brewing.make_sound("player", user, "brewing_magic_sound")
+				else
+					brewing.make_sound("player", user, "brewing_magic_fail")
+					minetest.chat_send_player(user_name, S("Failed teleport: The position is ocupied"))
+				end
+				brewing.players[user_name]["teleport"] = nil
+			end
+			itemstack:take_item()
+			return itemstack
+		end,
+	}
+	return def
+end
+
+brewing.grant = function(player, effect_name, potion_name, description_name, time, flags)
+	local rootdef = minetest.registered_items[potion_name]
+	if rootdef == nil then
+		return
+	end
+	if rootdef.potions == nil then
+		return
+	end
+	local def = {}
+	for name, val in pairs(rootdef.potions) do
+		def[name] = val
+	end
+	if flags.inv==true then
+		def.gravity = 0 - def.gravity
+		def.speed = 0 - def.speed
+		def.jump = 0 - def.jump
+		def.tnt = 0 - def.tnt
+	end
+	local player_name = player:get_player_name()
+	playerphysics.add_physics_factor(player, effect_name, potion_name, def[effect_name])
+	minetest.chat_send_player(player_name, S("You are under the effects of the").." "..description_name.." "..S("potion."))
+	minetest.after(time, function()
+		if minetest.get_player_by_name(player_name)~=nil then
+			playerphysics.remove_physics_factor(player, effect_name, potion_name)
+			minetest.chat_send_player(player_name, S("The effects of the").." "..description_name.." "..S("potion have worn off."))
+		end
+	end)
+end

gem.lua

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+minetest.register_craftitem("brewing:magic_gem", {
+	description = ("Magic Gem"),
+	inventory_image = "brewing_magic_gem.png",
+})
+
+