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
@@ -13,18 +11,20 @@ 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
 
 local cart_entity = {
+	initial_properties = {
 		physical = false,
 		collisionbox = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
 		visual = "mesh",
 		mesh = "cart.x",
 		visual_size = {x=1, y=1},
 		textures = {"cart.png"},
+	},
 
 	driver = nil,
 	punched = false, -- used to re-send velocity and position
@@ -38,9 +38,9 @@ local cart_entity = {
 }
 
 -- Model and textures
-if boost_cart.mtg_compat then
+if boost_cart.MTG_CARTS then
-	cart_entity.mesh = "carts_cart.b3d"
+	cart_entity.initial_properties.mesh = "carts_cart.b3d"
-	cart_entity.textures = {"carts_cart.png"}
+	cart_entity.initial_properties.textures = {"carts_cart.png"}
 end
 
 function cart_entity:on_rightclick(clicker)
@@ -54,6 +54,12 @@ function cart_entity:on_rightclick(clicker)
 	elseif not self.driver then
 		self.driver = player_name
 		boost_cart:manage_attachment(clicker, self.object)
+
+		if default.player_set_animation then
+			-- player_api(/default) does not update the animation
+			-- when the player is attached, reset to default animation
+			default.player_set_animation(clicker, "stand")
+		end
 	end
 end
 
@@ -69,18 +75,29 @@ function cart_entity:on_activate(staticdata, dtime_s)
 		return
 	end
 	self.railtype = data.railtype
-	if data.old_dir then
+	self.old_dir = data.old_dir or self.old_dir
-		self.old_dir = data.old_dir
+	self.old_pos = data.old_pos or self.old_pos
+	-- Correct the position when the cart drives further after the last 'step()'
+	if self.old_pos and boost_cart:is_rail(self.old_pos, self.railtype) then
+		self.object:set_pos(self.old_pos)
 	end
 end
 
 function cart_entity:get_staticdata()
 	return minetest.serialize({
 		railtype = self.railtype,
-		old_dir = self.old_dir
+		old_dir = self.old_dir,
+		old_pos = self.old_pos
 	})
 end
 
+-- 0.5.x and later: When the driver leaves
+function cart_entity:on_detach_child(child)
+	if child and child:get_player_name() == self.driver then
+		self.driver = nil
+	end
+end
+
 function cart_entity:on_punch(puncher, time_from_last_punch, tool_capabilities, direction)
 	local pos = self.object:get_pos()
 	local vel = self.object:get_velocity()
@@ -216,11 +233,12 @@ function cart_entity:on_step(dtime)
 	)
 	local dir_changed = not vector.equals(dir, self.old_dir)
 
-	local new_acc = {x=0, y=0, z=0}
+	local acc = 0
 	if stop_wiggle or vector.equals(dir, {x=0, y=0, z=0}) then
 		vel = {x=0, y=0, z=0}
 		local pos_r = vector.round(pos)
-		if not boost_cart:is_rail(pos_r, self.railtype) then
+		if not boost_cart:is_rail(pos_r, self.railtype)
+				and self.old_pos then
 			pos = self.old_pos
 		elseif not stop_wiggle then
 			pos = pos_r
@@ -232,7 +250,7 @@ function cart_entity:on_step(dtime)
 	else
 		-- Direction change detected
 		if dir_changed then
-			vel = vector.multiply(dir, v3_len(vel))
+			vel = vector.multiply(dir, math.abs(vel.x + vel.z))
 			update.vel = true
 			if dir.y ~= self.old_dir.y then
 				pos = vector.round(pos)
@@ -250,7 +268,7 @@ function cart_entity:on_step(dtime)
 		end
 
 		-- Calculate current cart acceleration
-		local acc = nil
+		acc = nil
 
 		local acc_meta = minetest.get_meta(pos):get_string("cart_acceleration")
 		if acc_meta == "halt" and not self.punched then
@@ -269,7 +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]
@@ -292,21 +310,20 @@ function cart_entity:on_step(dtime)
 		else
 			acc = 0
 		end
-
-		new_acc = vector.multiply(dir, acc)
 	end
 
-	-- Limits
+	-- Limit cart speed
-	local max_vel = boost_cart.speed_max
+	local vel_len = vector.length(vel)
-	for _,v in pairs({"x","y","z"}) do
+	if vel_len > boost_cart.speed_max then
-		if math.abs(vel[v]) > max_vel then
+		vel = vector.multiply(vel, boost_cart.speed_max / vel_len)
-			vel[v] = boost_cart:get_sign(vel[v]) * max_vel
-			new_acc[v] = 0
 		update.vel = true
 	end
+	if vel_len >= boost_cart.speed_max and acc > 0 then
+		acc = 0
 	end
 
-	self.object:set_acceleration(new_acc)
+	self.object:set_acceleration(vector.multiply(dir, acc))
+
 	self.old_pos = vector.round(pos)
 	local old_y_dir = self.old_dir.y
 	if not vector.equals(dir, {x=0, y=0, z=0}) and not stop_wiggle then
@@ -361,18 +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
+
 			eye.z = -dir.y * 8
 		end
 		player:set_attach(self.object, "", feet,
@@ -395,7 +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(

depends.txt

@@ -1,4 +0,0 @@
-default
-mesecons?
-moreores?
-carts?

description.txt

@@ -1 +0,0 @@
-This mod offers improved minecarts and a few more rail types.

doc/mod_api.txt

@@ -0,0 +1,71 @@
+boost_cart API
+==============
+
+This file provides information about the API of boost_cart for the use in
+mods. The API might change slightly when the development goes on, so avoid
+using internal tables or functions which are not documented here.
+
+
+Types
+-----
+
+* `SwitchIgnore` -> `number/nil`
+	* Specifies which player control was pressed. This value is used to prefer
+	  straight rails instead of preferring left and right rail checks.
+		* `1`: Ignore left rail
+		* `2`: Ignore right rail
+		* `nil`: Ignore no rail
+
+
+Entity movement
+---------------
+These functions are grouped so that they make sense and then sorted alphabetically.
+
+* `boost_cart:manage_attachment(player, obj)`
+	* Attaches or detaches the player to/from an object, depending on what is
+	  supplied to `obj`.
+	* `player`: `ObjectRef` of the player
+	* `obj`: `ObjectRef` (to attach) or `nil` (to detach)
+* `boost_cart:get_sign(n)` -> `number`
+	* Returns the sign for the given number. Values: `-1`, `0`, `1`
+	* `n`: any `number`
+* `boost_cart:velocity_to_dir(vel)` -> `vector`
+	* Returns the cart direction depending on `vel`. Each coordinate can have
+	  one of the `get_sign()` return values.
+	* `vel`: velocity as `vector`
+* `boost_cart:boost_rail(pos, amount)`
+	* Sets the rail acceleration for the given position to `amount` and punches
+	  carts which are at the given position.
+	* `pos`: `vector`, rail position
+	* `amount`: `number`, negative to brake, positive to boost
+* `boost_cart:get_rail_direction(pos, dir, ctrl, old_switch, railtype)`
+	-> `vector, SwitchIgnore`
+	* Returns the direction to where the next rail is, and which player control that
+	  should be ignored in the next call.
+	* `pos`: `vector`, position of the cart
+	* `dir`: `vector`, movement direction of the cart (see `velocity_to_dir()`)
+	* `ctrl`: Player controls table or `nil` (no player)
+	* `old_switch`: `SwitchIgnore`
+	* `railtype`: (optional) `number`, gets passed indirectly to `is_rail()`
+
+
+Rail helper functions
+---------------------
+* `boost_cart:get_rail_groups(groups)` -> `table`
+	* Returns a group table with preset values for a common rail node
+	* `groups`: (optional) `table`, additional groups append (or overwrite)
+	* Hint: To register an incompatible rail type, set the group
+	  `connect_to_raillike` to the value returned by
+	  `minetest.raillike_group(new_rail_type)`
+* `boost_cart:is_rail(pos, [railtype])` -> `boolean`
+	* Returns whether the node at `pos` is a rail. When `railtype` is specified,
+	  `true` is only returned when the node is in the same rail group.
+	* `pos`: `vector` of the node to check
+	* `railtype`: (optional) `number`, rail group number
+* `boost_cart:register_rail(name, def)`
+	* Registers a new rail with preset node definition defaults as fallback
+	* `name`: `string`, node name of the new rail
+	* `def`: Node definition table, containing at least the following keys:
+		* `description`
+		* `groups`
+		* `tiles`

functions.lua

@@ -10,16 +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
+	if wants_attach then
-		local y_pos = self.old_player_model and 6 or -4
+		player:set_attach(obj, "", {x=0, y=-4, z=0}, {x=0, y=0, z=0})
-		player:set_attach(obj, "", {x=0, y=y_pos, 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()
@@ -104,6 +105,16 @@ function boost_cart:get_rail_direction(pos_, dir, ctrl, old_switch, railtype)
 		right.z = -dir.x
 	end
 
+	local straight_priority = ctrl and dir.y ~= 0
+
+	-- Normal, to disallow rail switching up- & downhill
+	if straight_priority then
+		cur = self:check_front_up_down(pos, dir, true, railtype)
+		if cur then
+			return cur
+		end
+	end
+
 	if ctrl then
 		if old_switch == 1 then
 			left_check = false
@@ -127,10 +138,12 @@ function boost_cart:get_rail_direction(pos_, dir, ctrl, old_switch, railtype)
 	end
 
 	-- Normal
+	if not straight_priority then
 		cur = self:check_front_up_down(pos, dir, true, railtype)
 		if cur then
 			return cur
 		end
+	end
 
 	-- Left, if not already checked
 	if left_check then
@@ -208,6 +221,9 @@ function boost_cart:boost_rail(pos, amount)
 end
 
 function boost_cart:register_rail(name, def_overwrite)
+	local sound_func = default.node_sound_metal_defaults
+		or default.node_sound_defaults
+
 	local def = {
 		drawtype = "raillike",
 		paramtype = "light",
@@ -217,7 +233,8 @@ function boost_cart:register_rail(name, def_overwrite)
 		selection_box = {
 			type = "fixed",
 			fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
-		}
+		},
+		sounds = sound_func()
 	}
 	for k, v in pairs(def_overwrite) do
 		def[k] = v

init.lua

@@ -1,12 +1,15 @@
 
+if not minetest.features.object_use_texture_alpha then
+	error("[boost_cart] Your Minetest version is no longer supported."
+		.. " (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
-if not minetest.settings then
+boost_cart.PLAYER_API = minetest.global_exists("player_api")
-	error("[boost_cart] Your Minetest version is no longer supported."
+boost_cart.player_attached = {}
-		.. " (Version <= 0.4.15)")
-end
 
 local function getNum(setting)
 	return tonumber(minetest.settings:get(setting))
@@ -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 boost_cart.PLAYER_API then
-if not default.player_attached then
+	-- This is a table reference!
-	default.player_attached = {}
+	boost_cart.player_attached = player_api.player_attached
 end
 
-minetest.after(1, function()
-	boost_cart.old_player_model = type(player_api) ~= "table"
-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_CARTS then
-if boost_cart.mtg_compat 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
+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

@@ -16,9 +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")
-else
+
+	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
+		raildef.groups.connect_to_raillike = minetest.raillike_group("rail")
+		minetest.override_item("moreores:copper_rail", {
+			groups = raildef.groups
+		})
+		copperrail_registered = true
+	end
+end
+if not copperrail_registered then
 	boost_cart:register_rail(":carts:copperrail", {
 		description = "Copper rail",
 		tiles = {