recipe and rope length now configurable

2 files changed, 490 insertions, 481 deletions

diff --git a/config.lua b/config.lua
index f57ea9c..631261e 100644
--- a/config.lua
+++ b/config.lua
@@ -4,5 +4,11 @@ towercrane.max_height = 24
 -- Maximum crane width in blocks (12..n)
 towercrane.max_width = 24
 
+-- Crane rope lenght in block (max_height .. max_height+x)
+towercrane.rope_length = 24
+
 -- Gain factor for the crane sound (0.0 to 1)
 towercrane.gain = 1
+
+-- Recipe available (true/false)
+towercrane.recipe = true
diff --git a/init.lua b/init.lua
index e62f96a..4624bed 100644
--- a/init.lua
+++ b/init.lua
@@ -1,19 +1,20 @@
 --[[
 
-    Tower Crane Mod
-    ===============
-
-    v0.03 by JoSt
-    
-    Copyright (C) 2017 Joachim Stolberg
-    LGPLv2.1+
-    See LICENSE.txt for more information
-
-    History:
-    2017-06-04  v0.01  first version
-    2017-06-06  v0.02  Hook bugfix
-    2017-06-07  v0.03  fixed 2 bugs, added config.lua and sound
-    
+	Tower Crane Mod
+	===============
+
+	v0.04 by JoSt
+	
+	Copyright (C) 2017 Joachim Stolberg
+	LGPLv2.1+
+	See LICENSE.txt for more information
+
+	History:
+	2017-06-04  v0.01  first version
+	2017-06-06  v0.02  Hook bugfix
+	2017-06-07  v0.03  fixed 2 bugs, added config.lua and sound
+	2017-06-08  v0.04  recipe and rope length now configurable
+	
 ]]--
 
 
@@ -25,122 +26,122 @@ dofile(minetest.get_modpath("towercrane") .. "/config.lua")
 --##  Tower Crane Hook
 --##################################################################################################
 local hook = {
-    physical = true, 
-    collisionbox = {-0.2, -0.2, -0.2, 0.2, 0.2, 0.2},
-    collide_with_objects = false,   
-    visual = "cube",
-    visual_size = {x=0.6, y=0.6},
-    textures = {
-        "towercrane_hook.png",
-        "towercrane_hook.png",
-        "towercrane_hook.png",
-        "towercrane_hook.png",
-        "towercrane_hook.png",
-        "towercrane_hook.png",
-    },
-    groups = {cracky=1},
-    -- local variabels
-    driver = nil,
-    speed_forward=0,
-    speed_right=0,
-    speed_up=0,
-    sound=nil,
+	physical = true, 
+	collisionbox = {-0.2, -0.2, -0.2, 0.2, 0.2, 0.2},
+	collide_with_objects = false,   
+	visual = "cube",
+	visual_size = {x=0.6, y=0.6},
+	textures = {
+		"towercrane_hook.png",
+		"towercrane_hook.png",
+		"towercrane_hook.png",
+		"towercrane_hook.png",
+		"towercrane_hook.png",
+		"towercrane_hook.png",
+	},
+	groups = {cracky=1},
+	-- local variabels
+	driver = nil,
+	speed_forward=0,
+	speed_right=0,
+	speed_up=0,
+	sound=nil,
 }
 ----------------------------------------------------------------------------------------------------
 -- Enter/leave the Hook
 ----------------------------------------------------------------------------------------------------
 function hook:on_rightclick(clicker)
-    local name = clicker:get_player_name()
-    if self.driver and clicker == self.driver then  -- leave?
-        clicker:set_detach()
-        default.player_attached[name] = false
-        default.player_set_animation(clicker, "stand" , 10)
-        self.driver = nil
-        if self.sound ~= nil then
-            minetest.sound_stop(self.sound)
-            self.sound = nil
-        end
-    elseif not self.driver then                     -- enter?
-        self.driver = clicker
-        clicker:set_attach(self.object, "", {x=0,y=15,z=-3}, {x=0,y=0,z=0})
-        default.player_attached[name] = true
-        default.player_set_animation(clicker, "sit" , 10)
-    end
+	local name = clicker:get_player_name()
+	if self.driver and clicker == self.driver then  -- leave?
+		clicker:set_detach()
+		default.player_attached[name] = false
+		default.player_set_animation(clicker, "stand" , 10)
+		self.driver = nil
+		if self.sound ~= nil then
+			minetest.sound_stop(self.sound)
+			self.sound = nil
+		end
+	elseif not self.driver then                     -- enter?
+		self.driver = clicker
+		clicker:set_attach(self.object, "", {x=0,y=15,z=-3}, {x=0,y=0,z=0})
+		default.player_attached[name] = true
+		default.player_set_animation(clicker, "sit" , 10)
+	end
 end
 
 ----------------------------------------------------------------------------------------------------
 -- Hook control
 ----------------------------------------------------------------------------------------------------
 function hook:on_step(dtime)
-    -- remove hook from  last visit
-    if self.pos1 == nil or self.pos2 == nil then
-        self.object:remove()
-        return
-    end
-    if self.driver then
-        local ctrl = self.driver:get_player_control()
-        local yaw = self.driver:get_look_horizontal()
-        local pos = self.driver:getpos()
-        local max_speed = 5
-        local velocity = 0.5
-
-        if ctrl.up then             -- forward
-            self.speed_forward = math.min(self.speed_forward + velocity, max_speed)
-        elseif ctrl.down then       -- backward
-            self.speed_forward = math.max(self.speed_forward - velocity, -max_speed)
-        elseif self.speed_forward > 0 then
-            self.speed_forward = self.speed_forward - velocity
-        elseif self.speed_forward < 0 then
-            self.speed_forward = self.speed_forward + velocity
-        end
-        
-        if ctrl.right then          -- right
-            self.speed_right = math.min(self.speed_right + velocity, max_speed)
-        elseif ctrl.left then       -- left
-            self.speed_right = math.max(self.speed_right - velocity, -max_speed)
-        elseif self.speed_right > 0 then
-            self.speed_right = self.speed_right - velocity
-        elseif self.speed_right < 0 then
-            self.speed_right = self.speed_right + velocity
-        end
-
-        if ctrl.jump then           -- up
-            self.speed_up = math.min(self.speed_up + velocity, 5)
-        elseif ctrl.sneak then      -- down
-            self.speed_up = math.max(self.speed_up - velocity, -5)
-        elseif self.speed_up > 0 then
-            self.speed_up = self.speed_up - velocity
-        elseif self.speed_up < 0 then
-            self.speed_up = self.speed_up + velocity
-        end
-
-        -- calculate the direction vector
-        local vx = math.cos(yaw+math.pi/2) * self.speed_forward + math.cos(yaw) * self.speed_right
-        local vz = math.sin(yaw+math.pi/2) * self.speed_forward + math.sin(yaw) * self.speed_right
-
-        -- check if outside of the construction area
-        if pos.x < self.pos1.x then vx= velocity end
-        if pos.x > self.pos2.x then vx= -velocity end
-        if pos.y < self.pos1.y then self.speed_up=  velocity end
-        if pos.y > self.pos2.y then self.speed_up= -velocity end
-        if pos.z < self.pos1.z then vz=  velocity end
-        if pos.z > self.pos2.z then vz= -velocity end
-
-        if vx ~= 0 or vz ~= 0 or self.speed_up ~= 0 then
-            if self.sound == nil then
-                self.sound = minetest.sound_play({name="crane"},{object=self.object,
-                                                 gain=towercrane.gain, max_hear_distance=20,
-                                                 loop=true})
-            end
-        elseif self.sound ~= nil then
-            minetest.sound_stop(self.sound)
-            self.sound = nil
-        end
-        
-        self.object:setvelocity({x=vx, y=self.speed_up,z=vz})
-    else
-        self.object:setvelocity({x=0, y=0,z=0})
-    end
+	-- remove hook from  last visit
+	if self.pos1 == nil or self.pos2 == nil then
+		self.object:remove()
+		return
+	end
+	if self.driver then
+		local ctrl = self.driver:get_player_control()
+		local yaw = self.driver:get_look_horizontal()
+		local pos = self.driver:getpos()
+		local max_speed = 5
+		local velocity = 0.5
+
+		if ctrl.up then             -- forward
+			self.speed_forward = math.min(self.speed_forward + velocity, max_speed)
+		elseif ctrl.down then       -- backward
+			self.speed_forward = math.max(self.speed_forward - velocity, -max_speed)
+		elseif self.speed_forward > 0 then
+			self.speed_forward = self.speed_forward - velocity
+		elseif self.speed_forward < 0 then
+			self.speed_forward = self.speed_forward + velocity
+		end
+		
+		if ctrl.right then          -- right
+			self.speed_right = math.min(self.speed_right + velocity, max_speed)
+		elseif ctrl.left then       -- left
+			self.speed_right = math.max(self.speed_right - velocity, -max_speed)
+		elseif self.speed_right > 0 then
+			self.speed_right = self.speed_right - velocity
+		elseif self.speed_right < 0 then
+			self.speed_right = self.speed_right + velocity
+		end
+
+		if ctrl.jump then           -- up
+			self.speed_up = math.min(self.speed_up + velocity, 5)
+		elseif ctrl.sneak then      -- down
+			self.speed_up = math.max(self.speed_up - velocity, -5)
+		elseif self.speed_up > 0 then
+			self.speed_up = self.speed_up - velocity
+		elseif self.speed_up < 0 then
+			self.speed_up = self.speed_up + velocity
+		end
+
+		-- calculate the direction vector
+		local vx = math.cos(yaw+math.pi/2) * self.speed_forward + math.cos(yaw) * self.speed_right
+		local vz = math.sin(yaw+math.pi/2) * self.speed_forward + math.sin(yaw) * self.speed_right
+
+		-- check if outside of the construction area
+		if pos.x < self.pos1.x then vx= velocity end
+		if pos.x > self.pos2.x then vx= -velocity end
+		if pos.y < self.pos1.y then self.speed_up=  velocity end
+		if pos.y > self.pos2.y then self.speed_up= -velocity end
+		if pos.z < self.pos1.z then vz=  velocity end
+		if pos.z > self.pos2.z then vz= -velocity end
+
+		if vx ~= 0 or vz ~= 0 or self.speed_up ~= 0 then
+			if self.sound == nil then
+				self.sound = minetest.sound_play({name="crane"},{object=self.object,
+												 gain=towercrane.gain, max_hear_distance=20,
+												 loop=true})
+			end
+		elseif self.sound ~= nil then
+			minetest.sound_stop(self.sound)
+			self.sound = nil
+		end
+		
+		self.object:setvelocity({x=vx, y=self.speed_up,z=vz})
+	else
+		self.object:setvelocity({x=0, y=0,z=0})
+	end
 end
 
 ----------------------------------------------------------------------------------------------------
@@ -155,443 +156,445 @@ minetest.register_entity("towercrane:hook", hook)
 --##################################################################################################
 
 local function turnright(dir)
-    local facedir = minetest.dir_to_facedir(dir)
-    return minetest.facedir_to_dir((facedir + 1) % 4)
+	local facedir = minetest.dir_to_facedir(dir)
+	return minetest.facedir_to_dir((facedir + 1) % 4)
 end
 
 local function turnleft(dir)
-    local facedir = minetest.dir_to_facedir(dir)
-    return minetest.facedir_to_dir((facedir + 3) % 4)
+	local facedir = minetest.dir_to_facedir(dir)
+	return minetest.facedir_to_dir((facedir + 3) % 4)
 end
 
 ----------------------------------------------------------------------------------------------------
 -- Check space for mast and arm
 ----------------------------------------------------------------------------------------------------
 local function check_space(pos, dir, height, width)
-    for i = 1,height+2 do
-        pos.y = pos.y + 1
-        if minetest.get_node_or_nil(pos).name ~= "air" then
-            return false
-        end
-    end
-    
-    pos.x = pos.x + dir.x*2
-    pos.z = pos.z + dir.z*2
-    for i = 1,width+3 do
-        pos.x = pos.x + dir.x
-        pos.z = pos.z + dir.z
-        if minetest.get_node_or_nil(pos).name ~= "air" then
-            return false
-        end
-    end
-    return true
+	for i = 1,height+2 do
+		pos.y = pos.y + 1
+		if minetest.get_node_or_nil(pos).name ~= "air" then
+			return false
+		end
+	end
+	
+	pos.x = pos.x + dir.x*2
+	pos.z = pos.z + dir.z*2
+	for i = 1,width+3 do
+		pos.x = pos.x + dir.x
+		pos.z = pos.z + dir.z
+		if minetest.get_node_or_nil(pos).name ~= "air" then
+			return false
+		end
+	end
+	return true
 end
 
 ----------------------------------------------------------------------------------------------------
 -- Constuct mast and arm
 ----------------------------------------------------------------------------------------------------
 local function construct_crane(pos, dir, height, width, owner)
-    pos.y = pos.y + 1
-    minetest.env:add_node(pos, {name="towercrane:mast_ctrl_off", param2=minetest.dir_to_facedir(dir)})
-    local meta = minetest.get_meta(pos)
-    meta:set_string("dir", minetest.pos_to_string(dir))
-    meta:set_string("owner", owner)
-    meta:set_int("height", height)
-    meta:set_int("width", width)
-
-    for i = 1,height+1 do
-        pos.y = pos.y + 1
-        minetest.env:add_node(pos, {name="towercrane:mast"})
-    end
-    
-    pos.y = pos.y - 2
-    pos.x = pos.x - dir.x
-    pos.z = pos.z - dir.z
-    minetest.env:add_node(pos, {name="towercrane:arm2"})
-    pos.x = pos.x - dir.x
-    pos.z = pos.z - dir.z
-    minetest.env:add_node(pos, {name="towercrane:arm"})
-    pos.x = pos.x - dir.x
-    pos.z = pos.z - dir.z
-    minetest.env:add_node(pos, {name="towercrane:balance"})
-    pos.x = pos.x + 3 * dir.x
-    pos.z = pos.z + 3 * dir.z
-    
-    for i = 1,width do
-        pos.x = pos.x + dir.x
-        pos.z = pos.z + dir.z
-        if i % 2 == 0 then
-            minetest.env:add_node(pos, {name="towercrane:arm2"})
-        else
-            minetest.env:add_node(pos, {name="towercrane:arm"})
-        end
-    end
+	pos.y = pos.y + 1
+	minetest.env:add_node(pos, {name="towercrane:mast_ctrl_off", param2=minetest.dir_to_facedir(dir)})
+	local meta = minetest.get_meta(pos)
+	meta:set_string("dir", minetest.pos_to_string(dir))
+	meta:set_string("owner", owner)
+	meta:set_int("height", height)
+	meta:set_int("width", width)
+
+	for i = 1,height+1 do
+		pos.y = pos.y + 1
+		minetest.env:add_node(pos, {name="towercrane:mast"})
+	end
+	
+	pos.y = pos.y - 2
+	pos.x = pos.x - dir.x
+	pos.z = pos.z - dir.z
+	minetest.env:add_node(pos, {name="towercrane:arm2"})
+	pos.x = pos.x - dir.x
+	pos.z = pos.z - dir.z
+	minetest.env:add_node(pos, {name="towercrane:arm"})
+	pos.x = pos.x - dir.x
+	pos.z = pos.z - dir.z
+	minetest.env:add_node(pos, {name="towercrane:balance"})
+	pos.x = pos.x + 3 * dir.x
+	pos.z = pos.z + 3 * dir.z
+	
+	for i = 1,width do
+		pos.x = pos.x + dir.x
+		pos.z = pos.z + dir.z
+		if i % 2 == 0 then
+			minetest.env:add_node(pos, {name="towercrane:arm2"})
+		else
+			minetest.env:add_node(pos, {name="towercrane:arm"})
+		end
+	end
 end
 
 ----------------------------------------------------------------------------------------------------
 -- Remove the crane
 ----------------------------------------------------------------------------------------------------
 local function dig_crane(pos, dir, height, width)
-    pos.y = pos.y + 1
-    minetest.env:remove_node(pos, {name="towercrane:mast_ctrl_off"})
-    
-    for i = 1,height+1 do
-        pos.y = pos.y + 1
-        minetest.env:remove_node(pos, {name="towercrane:mast"})
-    end
-
-    pos.y = pos.y - 2
-    pos.x = pos.x - dir.x
-    pos.z = pos.z - dir.z
-    minetest.env:remove_node(pos, {name="towercrane:arm2"})
-    pos.x = pos.x - dir.x
-    pos.z = pos.z - dir.z
-    minetest.env:remove_node(pos, {name="towercrane:arm"})
-    pos.x = pos.x - dir.x
-    pos.z = pos.z - dir.z
-    minetest.env:remove_node(pos, {name="towercrane:balance"})
-    pos.x = pos.x + 3 * dir.x
-    pos.z = pos.z + 3 * dir.z
-    
-    for i = 1,width do
-        pos.x = pos.x + dir.x
-        pos.z = pos.z + dir.z
-        if i % 2 == 0 then
-            minetest.env:remove_node(pos, {name="towercrane:arm2"})
-        else
-            minetest.env:remove_node(pos, {name="towercrane:arm"})
-        end
-    end
+	pos.y = pos.y + 1
+	minetest.env:remove_node(pos, {name="towercrane:mast_ctrl_off"})
+	
+	for i = 1,height+1 do
+		pos.y = pos.y + 1
+		minetest.env:remove_node(pos, {name="towercrane:mast"})
+	end
+
+	pos.y = pos.y - 2
+	pos.x = pos.x - dir.x
+	pos.z = pos.z - dir.z
+	minetest.env:remove_node(pos, {name="towercrane:arm2"})
+	pos.x = pos.x - dir.x
+	pos.z = pos.z - dir.z
+	minetest.env:remove_node(pos, {name="towercrane:arm"})
+	pos.x = pos.x - dir.x
+	pos.z = pos.z - dir.z
+	minetest.env:remove_node(pos, {name="towercrane:balance"})
+	pos.x = pos.x + 3 * dir.x
+	pos.z = pos.z + 3 * dir.z
+	
+	for i = 1,width do
+		pos.x = pos.x + dir.x
+		pos.z = pos.z + dir.z
+		if i % 2 == 0 then
+			minetest.env:remove_node(pos, {name="towercrane:arm2"})
+		else
+			minetest.env:remove_node(pos, {name="towercrane:arm"})
+		end
+	end
 end
 
 ----------------------------------------------------------------------------------------------------
 -- Place the hook in front of the base
 ----------------------------------------------------------------------------------------------------
 local function place_hook(pos, dir)
-    pos.y = pos.y - 1
-    pos.x = pos.x + dir.x
-    pos.z = pos.z + dir.z
-    return minetest.add_entity(pos, "towercrane:hook")
+	pos.y = pos.y - 1
+	pos.x = pos.x + dir.x
+	pos.z = pos.z + dir.z
+	return minetest.add_entity(pos, "towercrane:hook")
 end
 
 ----------------------------------------------------------------------------------------------------
 -- Register Crane base
 ----------------------------------------------------------------------------------------------------
 minetest.register_node("towercrane:base", {
-    description = "Tower Crane Base",
-    inventory_image = "towercrane_invent.png",
-    tiles = {
-        "towercrane_base_top.png",
-        "towercrane_base.png",
-        "towercrane_base.png",
-        "towercrane_base.png",
-        "towercrane_base.png",
-        "towercrane_base.png",
-    },
-    paramtype2 = "facedir",
-    is_ground_content = false,
-    groups = {cracky=2},
-    formspec = set_formspec,
-
-    -- set meta data (form for crane height and width, dir of the arm)
-    after_place_node = function(pos, placer)
-        local meta = minetest.get_meta(pos)
-        local owner = placer:get_player_name()
-        meta:set_string("owner", owner)
-        local formspec = "size[5,4]"..
-            "label[0,0;Construction area size]" ..
-            "field[1,1.5;3,1;size;height,width;]" ..
-            "button_exit[1,2;2,1;exit;Save]"
-        meta:set_string("formspec", formspec)
-
-        local fdir = minetest.dir_to_facedir(placer:get_look_dir(), false)
-        local dir = minetest.facedir_to_dir(fdir)
-        meta:set_string("dir", minetest.pos_to_string(dir))
-    end,
-
-    -- evaluate user input (height, width), destroyed old crane and build a new one with
-    -- the given size
-    on_receive_fields = function(pos, formname, fields, player)
-        if fields.size == nil then
-            return
-        end
-        local meta = minetest.get_meta(pos)
-
-        if not player or not player:is_player() then
-            return
-        end
-        local owner = meta:get_string("owner")
-        if player:get_player_name() ~= owner then
-            return
-        end
-        
-        local dir = minetest.string_to_pos(meta:get_string("dir"))
-        local height = meta:get_int("height")
-        local width = meta:get_int("width")
-        if dir ~= nil and height ~= nil and width ~= nil then
-           dig_crane(pos, dir, height, width)
-        end
-        --check for correct size format
-        size = string.split(fields.size, ",")
-        if #size == 2  then
-            local height = tonumber(size[1])
-            local width = tonumber(size[2])
-            if height ~= nil and width ~= nil then
-                height = math.max(height, 8)
-                height = math.min(height, towercrane.max_height)
-                width = math.max(width, 8)
-                width = math.min(width, towercrane.max_width)
-                meta:set_int("height", height)
-                meta:set_int("width", width)
-                meta:set_string("infotext", "Crane size: " .. height .. "," .. width)
-                if dir ~= nil then
-                    if check_space(table.copy(pos), dir, height, width) then
-                        construct_crane(table.copy(pos), dir, height, width, owner)
-                    else
-                        minetest.chat_send_player(owner, "Too less space to raise up the tower crane!")
-                    end
-                end
-            end
-        end
-    end,
-
-    -- remove mast and arm if base gets destroyed
-    on_destruct = function(pos)
-        local meta = minetest.get_meta(pos)
-        local dir = minetest.string_to_pos(meta:get_string("dir"))
-        local height = meta:get_int("height")
-        local width = meta:get_int("width")
-
-        -- remove crane
-        if dir ~= nil and height ~= nil and width ~= nil then
-           dig_crane(pos, dir, height, width)
-        end
-        -- remove hook
-        local id = minetest.hash_node_position(pos)
-        if towercrane.id then
-            towercrane.id:remove()
-            towercrane.id = nil
-        end
-    end,
+	description = "Tower Crane Base",
+	inventory_image = "towercrane_invent.png",
+	tiles = {
+		"towercrane_base_top.png",
+		"towercrane_base.png",
+		"towercrane_base.png",
+		"towercrane_base.png",
+		"towercrane_base.png",
+		"towercrane_base.png",
+	},
+	paramtype2 = "facedir",
+	is_ground_content = false,
+	groups = {cracky=2},
+	formspec = set_formspec,
+
+	-- set meta data (form for crane height and width, dir of the arm)
+	after_place_node = function(pos, placer)
+		local meta = minetest.get_meta(pos)
+		local owner = placer:get_player_name()
+		meta:set_string("owner", owner)
+		local formspec = "size[5,4]"..
+			"label[0,0;Construction area size]" ..
+			"field[1,1.5;3,1;size;height,width;]" ..
+			"button_exit[1,2;2,1;exit;Save]"
+		meta:set_string("formspec", formspec)
+
+		local fdir = minetest.dir_to_facedir(placer:get_look_dir(), false)
+		local dir = minetest.facedir_to_dir(fdir)
+		meta:set_string("dir", minetest.pos_to_string(dir))
+	end,
+
+	-- evaluate user input (height, width), destroyed old crane and build a new one with
+	-- the given size
+	on_receive_fields = function(pos, formname, fields, player)
+		if fields.size == nil then
+			return
+		end
+		local meta = minetest.get_meta(pos)
+
+		if not player or not player:is_player() then
+			return
+		end
+		local owner = meta:get_string("owner")
+		if player:get_player_name() ~= owner then
+			return
+		end
+		
+		local dir = minetest.string_to_pos(meta:get_string("dir"))
+		local height = meta:get_int("height")
+		local width = meta:get_int("width")
+		if dir ~= nil and height ~= nil and width ~= nil then
+		   dig_crane(pos, dir, height, width)
+		end
+		--check for correct size format
+		size = string.split(fields.size, ",")
+		if #size == 2  then
+			local height = tonumber(size[1])
+			local width = tonumber(size[2])
+			if height ~= nil and width ~= nil then
+				height = math.max(height, 8)
+				height = math.min(height, towercrane.max_height)
+				width = math.max(width, 8)
+				width = math.min(width, towercrane.max_width)
+				meta:set_int("height", height)
+				meta:set_int("width", width)
+				meta:set_string("infotext", "Crane size: " .. height .. "," .. width)
+				if dir ~= nil then
+					if check_space(table.copy(pos), dir, height, width) then
+						construct_crane(table.copy(pos), dir, height, width, owner)
+					else
+						minetest.chat_send_player(owner, "Too less space to raise up the tower crane!")
+					end
+				end
+			end
+		end
+	end,
+
+	-- remove mast and arm if base gets destroyed
+	on_destruct = function(pos)
+		local meta = minetest.get_meta(pos)
+		local dir = minetest.string_to_pos(meta:get_string("dir"))
+		local height = meta:get_int("height")
+		local width = meta:get_int("width")
+
+		-- remove crane
+		if dir ~= nil and height ~= nil and width ~= nil then
+		   dig_crane(pos, dir, height, width)
+		end
+		-- remove hook
+		local id = minetest.hash_node_position(pos)
+		if towercrane.id then
+			towercrane.id:remove()
+			towercrane.id = nil
+		end
+	end,
 })
 
 ----------------------------------------------------------------------------------------------------
 -- Register Crane balance
 ----------------------------------------------------------------------------------------------------
 minetest.register_node("towercrane:balance", {
-    description = "Tower Crane Balance",
-    tiles = {
-        "towercrane_base.png",
-        "towercrane_base.png",
-        "towercrane_base.png",
-        "towercrane_base.png",
-        "towercrane_base.png",
-        "towercrane_base.png",
-    },
-    paramtype2 = "facedir",
-    is_ground_content = false,
-    groups = {crumbly=0, not_in_creative_inventory=1},
+	description = "Tower Crane Balance",
+	tiles = {
+		"towercrane_base.png",
+		"towercrane_base.png",
+		"towercrane_base.png",
+		"towercrane_base.png",
+		"towercrane_base.png",
+		"towercrane_base.png",
+	},
+	paramtype2 = "facedir",
+	is_ground_content = false,
+	groups = {crumbly=0, not_in_creative_inventory=1},
 })
 
 ----------------------------------------------------------------------------------------------------
 -- Register Crane mast
 ----------------------------------------------------------------------------------------------------
 minetest.register_node("towercrane:mast", {
-    description = "Tower Crane Mast",
-    drawtype = "glasslike_framed",
-    tiles = {
-        "towercrane_mast.png",
-        "towercrane_mast.png",
-        "towercrane_mast.png",
-        "towercrane_mast.png",
-        "towercrane_mast.png",
-        "towercrane_mast.png",
-    },
-    paramtype2 = "facedir",
-    is_ground_content = false,
-    groups = {crumbly=0, not_in_creative_inventory=1},
+	description = "Tower Crane Mast",
+	drawtype = "glasslike_framed",
+	tiles = {
+		"towercrane_mast.png",
+		"towercrane_mast.png",
+		"towercrane_mast.png",
+		"towercrane_mast.png",
+		"towercrane_mast.png",
+		"towercrane_mast.png",
+	},
+	paramtype2 = "facedir",
+	is_ground_content = false,
+	groups = {crumbly=0, not_in_creative_inventory=1},
 })
 
 ----------------------------------------------------------------------------------------------------
 -- Register Crane Switch (on)
 ----------------------------------------------------------------------------------------------------
 minetest.register_node("towercrane:mast_ctrl_on", {
-    description = "Tower Crane Mast Ctrl On",
-    drawtype = "node",
-    tiles = {
-        "towercrane_mast_ctrl.png",
-        "towercrane_mast_ctrl.png",
-        "towercrane_mast_ctrl_on.png",
-        "towercrane_mast_ctrl_on.png",
-        "towercrane_mast_ctrl.png",
-        "towercrane_mast_ctrl.png",
-    },
-    on_rightclick = function (pos, node, clicker)
-        local meta = minetest.get_meta(pos)
-        if not clicker or not clicker:is_player() then
-            return
-        end
-        if clicker:get_player_name() ~= meta:get_string("owner") then
-            return
-        end
-        node.name = "towercrane:mast_ctrl_off"
-        minetest.swap_node(pos, node)
-
-        local id = minetest.hash_node_position(pos)
-        if towercrane.id then
-            towercrane.id:remove()
-            towercrane.id = nil
-        end
-    end,
-
-    on_construct = function(pos)
-        local meta = minetest.get_meta(pos)
-        meta:set_string("infotext", "Switch crane on/off")
-    end,
-
-    after_place_node = function(pos, placer, itemstack, pointed_thing)
-        local meta = minetest.get_meta(pos)
-        local owner = placer:get_player_name()
-        meta:set_string("owner", owner)
-    end,
-
-    paramtype2 = "facedir",
-    is_ground_content = false,
-    groups = {crumbly=0, not_in_creative_inventory=1},
+	description = "Tower Crane Mast Ctrl On",
+	drawtype = "node",
+	tiles = {
+		"towercrane_mast_ctrl.png",
+		"towercrane_mast_ctrl.png",
+		"towercrane_mast_ctrl_on.png",
+		"towercrane_mast_ctrl_on.png",
+		"towercrane_mast_ctrl.png",
+		"towercrane_mast_ctrl.png",
+	},
+	on_rightclick = function (pos, node, clicker)
+		local meta = minetest.get_meta(pos)
+		if not clicker or not clicker:is_player() then
+			return
+		end
+		if clicker:get_player_name() ~= meta:get_string("owner") then
+			return
+		end
+		node.name = "towercrane:mast_ctrl_off"
+		minetest.swap_node(pos, node)
+
+		local id = minetest.hash_node_position(pos)
+		if towercrane.id then
+			towercrane.id:remove()
+			towercrane.id = nil
+		end
+	end,
+
+	on_construct = function(pos)
+		local meta = minetest.get_meta(pos)
+		meta:set_string("infotext", "Switch crane on/off")
+	end,
+
+	after_place_node = function(pos, placer, itemstack, pointed_thing)
+		local meta = minetest.get_meta(pos)
+		local owner = placer:get_player_name()
+		meta:set_string("owner", owner)
+	end,
+
+	paramtype2 = "facedir",
+	is_ground_content = false,
+	groups = {crumbly=0, not_in_creative_inventory=1},
 })
 
 ----------------------------------------------------------------------------------------------------
 -- Register Crane Switch (off)
 ----------------------------------------------------------------------------------------------------
 minetest.register_node("towercrane:mast_ctrl_off", {
-    description = "Tower Crane Mast Ctrl Off",
-    drawtype = "node",
-    tiles = {
-        "towercrane_mast_ctrl.png",
-        "towercrane_mast_ctrl.png",
-        "towercrane_mast_ctrl_off.png",
-        "towercrane_mast_ctrl_off.png",
-        "towercrane_mast_ctrl.png",
-      "towercrane_mast_ctrl.png",
-    },
-    on_rightclick = function (pos, node, clicker)
-        -- switch switch on, calculate the construction area, and place the hook
-        local meta = minetest.get_meta(pos)
-        -- only the owner is allowed to switch
-        if not clicker or not clicker:is_player() then
-            return
-        end
-        if clicker:get_player_name() ~= meta:get_string("owner") then
-            return
-        end
-        -- swap to the other node
-        node.name = "towercrane:mast_ctrl_on"
-        minetest.swap_node(pos, node)
-        local dir = minetest.string_to_pos(meta:get_string("dir"))
-        if pos ~= nil and dir ~= nil then
-            -- store hook instance in 'towercrane'
-            local id = minetest.hash_node_position(pos)
-            towercrane.id = place_hook(table.copy(pos), dir)
-
-            -- calculate the construction area dimension (pos, pos2)
-            local height = meta:get_int("height")
-            local width = meta:get_int("width")
-
-            -- pos1 = close/right/below
-            dir = turnright(dir)
-            local pos1 = vector.add(pos, vector.multiply(dir, width/2))
-            dir = turnleft(dir)
-            local pos1 = vector.add(pos1, vector.multiply(dir, 1))
-            pos1.y = pos.y - 2 - height
-
-            -- pos2 = far/left/above
-            local pos2 = vector.add(pos1, vector.multiply(dir, width-1))
-            dir = turnleft(dir)
-            pos2 = vector.add(pos2, vector.multiply(dir, width))
-            pos2.y = pos.y - 3 + height
-
-            -- normalize x/z so that pos2 > pos1
-            if pos2.x < pos1.x then
-                pos2.x, pos1.x = pos1.x, pos2.x
-            end
-            if pos2.z < pos1.z then
-                pos2.z, pos1.z = pos1.z, pos2.z
-            end
-
-            -- store pos1/pos2 in the hook (LuaEntitySAO)
-            towercrane.id:get_luaentity().pos1 = pos1
-            towercrane.id:get_luaentity().pos2 = pos2
-        end
-    end,
-
-    on_construct = function(pos)
-        -- add infotext
-        local meta = minetest.get_meta(pos)
-        meta:set_string("infotext", "Switch crane on/off")
-    end,
-
-    after_place_node = function(pos, placer, itemstack, pointed_thing)
-        -- store owner for dig protection
-        local meta = minetest.get_meta(pos)
-        local owner = placer:get_player_name()
-        meta:set_string("owner", owner)
-    end,
-
-    paramtype2 = "facedir",
-    is_ground_content = false,
-    groups = {crumbly=0, not_in_creative_inventory=1},
+	description = "Tower Crane Mast Ctrl Off",
+	drawtype = "node",
+	tiles = {
+		"towercrane_mast_ctrl.png",
+		"towercrane_mast_ctrl.png",
+		"towercrane_mast_ctrl_off.png",
+		"towercrane_mast_ctrl_off.png",
+		"towercrane_mast_ctrl.png",
+	  "towercrane_mast_ctrl.png",
+	},
+	on_rightclick = function (pos, node, clicker)
+		-- switch switch on, calculate the construction area, and place the hook
+		local meta = minetest.get_meta(pos)
+		-- only the owner is allowed to switch
+		if not clicker or not clicker:is_player() then
+			return
+		end
+		if clicker:get_player_name() ~= meta:get_string("owner") then
+			return
+		end
+		-- swap to the other node
+		node.name = "towercrane:mast_ctrl_on"
+		minetest.swap_node(pos, node)
+		local dir = minetest.string_to_pos(meta:get_string("dir"))
+		if pos ~= nil and dir ~= nil then
+			-- store hook instance in 'towercrane'
+			local id = minetest.hash_node_position(pos)
+			towercrane.id = place_hook(table.copy(pos), dir)
+
+			-- calculate the construction area dimension (pos, pos2)
+			local height = meta:get_int("height")
+			local width = meta:get_int("width")
+
+			-- pos1 = close/right/below
+			dir = turnright(dir)
+			local pos1 = vector.add(pos, vector.multiply(dir, width/2))
+			dir = turnleft(dir)
+			local pos1 = vector.add(pos1, vector.multiply(dir, 1))
+			pos1.y = pos.y - 2 + height - towercrane.rope_length
+
+			-- pos2 = far/left/above
+			local pos2 = vector.add(pos1, vector.multiply(dir, width-1))
+			dir = turnleft(dir)
+			pos2 = vector.add(pos2, vector.multiply(dir, width))
+			pos2.y = pos.y - 3 + height
+
+			-- normalize x/z so that pos2 > pos1
+			if pos2.x < pos1.x then
+				pos2.x, pos1.x = pos1.x, pos2.x
+			end
+			if pos2.z < pos1.z then
+				pos2.z, pos1.z = pos1.z, pos2.z
+			end
+
+			-- store pos1/pos2 in the hook (LuaEntitySAO)
+			towercrane.id:get_luaentity().pos1 = pos1
+			towercrane.id:get_luaentity().pos2 = pos2
+		end
+	end,
+
+	on_construct = function(pos)
+		-- add infotext
+		local meta = minetest.get_meta(pos)
+		meta:set_string("infotext", "Switch crane on/off")
+	end,
+
+	after_place_node = function(pos, placer, itemstack, pointed_thing)
+		-- store owner for dig protection
+		local meta = minetest.get_meta(pos)
+		local owner = placer:get_player_name()
+		meta:set_string("owner", owner)
+	end,
+
+	paramtype2 = "facedir",
+	is_ground_content = false,
+	groups = {crumbly=0, not_in_creative_inventory=1},
 })
 
 ----------------------------------------------------------------------------------------------------
 -- Register Crane arm 1
 ----------------------------------------------------------------------------------------------------
 minetest.register_node("towercrane:arm", {
-    description = "Tower Crane Arm",
-    drawtype = "glasslike_framed",
-    tiles = {
-        "towercrane_arm.png",
-        "towercrane_arm.png",
-        "towercrane_arm.png",
-        "towercrane_arm.png",
-        "towercrane_arm.png",
-        "towercrane_arm.png",
-    },
-    paramtype2 = "facedir",
-    is_ground_content = false,
-    groups = {crumbly=0, not_in_creative_inventory=1},
+	description = "Tower Crane Arm",
+	drawtype = "glasslike_framed",
+	tiles = {
+		"towercrane_arm.png",
+		"towercrane_arm.png",
+		"towercrane_arm.png",
+		"towercrane_arm.png",
+		"towercrane_arm.png",
+		"towercrane_arm.png",
+	},
+	paramtype2 = "facedir",
+	is_ground_content = false,
+	groups = {crumbly=0, not_in_creative_inventory=1},
 })
 
 ----------------------------------------------------------------------------------------------------
 -- Register Crane arm 2
 ----------------------------------------------------------------------------------------------------
 minetest.register_node("towercrane:arm2", {
-    description = "Tower Crane Arm2",
-    drawtype = "glasslike_framed",
-    tiles = {
-        "towercrane_arm2.png",
-        "towercrane_arm2.png",
-        "towercrane_arm2.png",
-        "towercrane_arm2.png",
-        "towercrane_arm2.png",
-        "towercrane_arm2.png",
-    },
-    paramtype2 = "facedir",
-    is_ground_content = false,
-    groups = {crumbly=0, not_in_creative_inventory=1},
+	description = "Tower Crane Arm2",
+	drawtype = "glasslike_framed",
+	tiles = {
+		"towercrane_arm2.png",
+		"towercrane_arm2.png",
+		"towercrane_arm2.png",
+		"towercrane_arm2.png",
+		"towercrane_arm2.png",
+		"towercrane_arm2.png",
+	},
+	paramtype2 = "facedir",
+	is_ground_content = false,
+	groups = {crumbly=0, not_in_creative_inventory=1},
 })
 
 
 ----------------------------------------------------------------------------------------------------
 -- Register Recipe
 ----------------------------------------------------------------------------------------------------
-minetest.register_craft({
-	output = "towercrane:base",
-	recipe = {
-		{"default:steel_ingot", "default:steel_ingot", "default:steel_ingot"},
-		{"default:steel_ingot", "", ""},
-		{"default:steel_ingot", "dye:yellow", ""}
-	}
-})
+if towercrane.recipe then
+	minetest.register_craft({
+		output = "towercrane:base",
+		recipe = {
+			{"default:steel_ingot", "default:steel_ingot", "default:steel_ingot"},
+			{"default:steel_ingot", "", ""},
+			{"default:steel_ingot", "dye:yellow", ""}
+		}
+	})
+end