Bump to 5.0.0 and fix the copper rail

moreores only adds the copper rail when the 'carts' mod was found

cart_entity.lua

@@ -1,6 +1,4 @@
 
-local HAVE_MESECONS_ENABLED = minetest.global_exists("mesecon")
-
 function boost_cart:on_rail_step(entity, pos, distance)
 	-- Play rail sound
 	if entity.sound_counter <= 0 then
@@ -13,7 +11,7 @@ function boost_cart:on_rail_step(entity, pos, distance)
 	end
 	entity.sound_counter = entity.sound_counter - distance
 
-	if HAVE_MESECONS_ENABLED then
+	if boost_cart.MESECONS then
 		boost_cart:signal_detector_rail(pos)
 	end
 end
@@ -40,7 +38,7 @@ local cart_entity = {
 }
 
 -- Model and textures
-if boost_cart.mtg_compat then
+if boost_cart.MTG_CARTS then
 	cart_entity.initial_properties.mesh = "carts_cart.b3d"
 	cart_entity.initial_properties.textures = {"carts_cart.png"}
 end
@@ -289,7 +287,7 @@ function cart_entity:on_step(dtime)
 				acc = speed_mod * 10
 			end
 		end
-		if acc == nil and boost_cart.mtg_compat then
+		if acc == nil and boost_cart.MTG_CARTS then
 			-- MTG Cart API adaption
 			local rail_node = minetest.get_node(vector.round(pos))
 			local railparam = carts.railparams[rail_node.name]
@@ -380,18 +378,14 @@ function cart_entity:on_step(dtime)
 
 	-- Change player model rotation, depending on the Y direction
 	if player and dir.y ~= old_y_dir then
-		local feet = {x=0, y=0, z=0}
+		local feet = {x=0, y=-4, z=0}
 		local eye = {x=0, y=-4, z=0}
-		feet.y = boost_cart.old_player_model and 6 or -4
+
 		if dir.y ~= 0 then
 			-- TODO: Find a better way to calculate this
-			if boost_cart.old_player_model then
-				feet.y = feet.y + 2
-				feet.z = -dir.y * 6
-			else
-				feet.y = feet.y + 4
-				feet.z = -dir.y * 2
-			end
+			feet.y = feet.y + 4
+			feet.z = -dir.y * 2
+
 			eye.z = -dir.y * 8
 		end
 		player:set_attach(self.object, "", feet,
@@ -414,7 +408,7 @@ end
 minetest.register_entity(":carts:cart", cart_entity)
 
 -- Register item to place the entity
-if not boost_cart.mtg_compat then
+if not boost_cart.MTG_CARTS then
 	minetest.register_craftitem(":carts:cart", {
 		description = "Cart (Sneak+Click to pick up)",
 		inventory_image = minetest.inventorycube(

functions.lua

@@ -10,19 +10,17 @@ function boost_cart:manage_attachment(player, obj)
 	if not player then
 		return
 	end
-	local status = obj ~= nil
+	local wants_attach = obj ~= nil
+	local attached = player:get_attach() ~= nil
+
 	local player_name = player:get_player_name()
-	if default.player_attached[player_name] == status then
+	boost_cart.player_attached[player_name] = attached or wants_attach
+	if attached == wants_attach then
 		return
 	end
-	default.player_attached[player_name] = status
 
-	if status then
-		local y_pos = self.old_player_model and 6 or -4
-		if player:get_properties().visual == "upright_sprite" then
-			y_pos = -4
-		end
-		player:set_attach(obj, "", {x=0, y=y_pos, z=0}, {x=0, y=0, z=0})
+	if wants_attach then
+		player:set_attach(obj, "", {x=0, y=-4, z=0}, {x=0, y=0, z=0})
 		player:set_eye_offset({x=0, y=-4, z=0},{x=0, y=-4, z=0})
 	else
 		player:set_detach()

init.lua

@@ -1,13 +1,16 @@
 
-boost_cart = {}
-boost_cart.modpath = minetest.get_modpath("boost_cart")
-
-
-if not minetest.settings then
+if not minetest.features.object_use_texture_alpha then
 	error("[boost_cart] Your Minetest version is no longer supported."
-		.. " (Version <= 0.4.15)")
+		.. " (Version < 5.0.0)")
 end
 
+boost_cart = {}
+boost_cart.modpath = minetest.get_modpath("boost_cart")
+boost_cart.MESECONS = minetest.global_exists("mesecon")
+boost_cart.MTG_CARTS = minetest.global_exists("carts") and carts.pathfinder
+boost_cart.PLAYER_API = minetest.global_exists("player_api")
+boost_cart.player_attached = {}
+
 local function getNum(setting)
 	return tonumber(minetest.settings:get(setting))
 end
@@ -20,27 +23,22 @@ boost_cart.punch_speed_max = getNum("boost_cart.punch_speed_max") or 7
 boost_cart.path_distance_max = 3
 
 
--- Support for non-default games
-if not default.player_attached then
-	default.player_attached = {}
+if boost_cart.PLAYER_API then
+	-- This is a table reference!
+	boost_cart.player_attached = player_api.player_attached
 end
 
-minetest.after(0, function()
-	boost_cart.old_player_model = not minetest.global_exists("player_api")
-end)
-
 dofile(boost_cart.modpath.."/functions.lua")
 dofile(boost_cart.modpath.."/rails.lua")
 
-if minetest.global_exists("mesecon") then
+if boost_cart.MESECONS then
 	dofile(boost_cart.modpath.."/detector.lua")
 --else
 --	minetest.register_alias("carts:powerrail", "boost_cart:detectorrail")
 --	minetest.register_alias("carts:powerrail", "boost_cart:detectorrail_on")
 end
 
-boost_cart.mtg_compat = minetest.global_exists("carts") and carts.pathfinder
-if boost_cart.mtg_compat then
+if boost_cart.MTG_CARTS then
 	minetest.log("action", "[boost_cart] Overwriting definitions of similar carts mod")
 end
 dofile(boost_cart.modpath.."/cart_entity.lua")

mod.conf

@@ -1 +1,7 @@
-name = boost_cart
+name = boost_cart
+description = """
+Boost Cart
+The mod that add a cart and new kinds of rails to your world.
+"""
+depends = default
+optional_depends = mesecons, moreores, carts, player_api

rails.lua

@@ -16,18 +16,21 @@ boost_cart:register_rail(":"..regular_rail_itemname, {
 })
 
 -- Moreores' copper rail
+local copperrail_registered = false
 if minetest.get_modpath("moreores") then
 	minetest.register_alias("carts:copperrail", "moreores:copper_rail")
 
-	if minetest.raillike_group then
+	local raildef = minetest.registered_nodes["moreores:copper_rail"]
+	if raildef and minetest.raillike_group then
 		-- Ensure that this rail uses the same connect_to_raillike
-		local new_groups = minetest.registered_nodes["moreores:copper_rail"].groups
-		new_groups.connect_to_raillike = minetest.raillike_group("rail")
+		raildef.groups.connect_to_raillike = minetest.raillike_group("rail")
 		minetest.override_item("moreores:copper_rail", {
-			groups = new_groups
+			groups = raildef.groups
 		})
+		copperrail_registered = true
 	end
-else
+end
+if not copperrail_registered then
 	boost_cart:register_rail(":carts:copperrail", {
 		description = "Copper rail",
 		tiles = {