Fix 'Unable to register same mod storage twice' error

init.lua

@@ -1,8 +1,10 @@
 -- Minetest 5.4.1 : airutils
 
-local storage = minetest.get_mod_storage()
+airutils = {
+    storage = minetest.get_mod_storage()
+}
 
-airutils = {}
+local storage = airutils.storage
 
 airutils.colors ={
     black='#2b2b2b',
@@ -174,7 +176,7 @@ local function get_nodedef_field(nodename, fieldname)
     return minetest.registered_nodes[nodename][fieldname]
 end
 
---for 
+--for
 function airutils.eval_vertical_interception(initial_pos, end_pos)
     local ret_y = nil
 	local cast = minetest.raycast(initial_pos, end_pos, true, true)
@@ -211,7 +213,7 @@ end
 local function lerp(a, b, c)
 	return a + (b - a) * c
 end
- 
+
 function airutils.quadBezier(t, p0, p1, p2)
 	local l1 = lerp(p0, p1, t)
 	local l2 = lerp(p1, p2, t)
@@ -238,7 +240,7 @@ function airutils.get_ground_effect_lift(self, curr_pos, lift, wingspan)
             ground_distance = initial_pos.y - ground_y
         end
         --minetest.chat_send_all(dump(ground_distance))
-    
+
         --smooth the curve
         local distance_factor = ((ground_distance) * 1) / (wingspan)
         local effect_factor = airutils.quadBezier(distance_factor, 0, wingspan, 0)
@@ -246,13 +248,13 @@ function airutils.get_ground_effect_lift(self, curr_pos, lift, wingspan)
         if effect_factor > 0 then
             effect_factor = math.abs( half_wingspan - effect_factor )
         end
-        
+
         local lift_factor = ((effect_factor) * 1) / (half_wingspan) --agora isso é um percentual
         local max_extra_lift_percent = 0.5 * lift  --e aqui o maximo extra de sustentação
         local extra_lift = max_extra_lift_percent * lift_factor
         self._extra_lift = extra_lift
     end
-    
+
     return self._extra_lift --return the value stored
 end
 
@@ -271,7 +273,7 @@ function airutils.getLiftAccel(self, velocity, accel, longit_speed, roll, curr_p
     local accel_wind = vector.subtract(accel, wind)  --why? because I need to fake more speed when against the wind to gain lift
     local vel_wind = vector.multiply(accel_wind, self.dtime)
     local new_velocity = vector.add(velocity, vel_wind)
-    
+
     if longit_speed == nil then longit_speed = 0 end
     wingspan = wingspan or 10
     local ground_effect_extra_lift = airutils.get_ground_effect_lift(self, curr_pos, lift, wingspan)
@@ -283,7 +285,7 @@ function airutils.getLiftAccel(self, velocity, accel, longit_speed, roll, curr_p
     max_height = max_height or 20000
     local wing_config = 0
     if self._wing_configuration then wing_config = self._wing_configuration end --flaps!
-    
+
     local retval = accel
     local min_speed = 1;
     if self._min_speed then min_speed = self._min_speed end
@@ -305,7 +307,7 @@ function airutils.getLiftAccel(self, velocity, accel, longit_speed, roll, curr_p
 
 	    local rotation=self.object:get_rotation()
 	    local vrot = airutils.dir_to_rot(velocity,rotation)
-	    
+
 	    local hpitch,hyaw = pitchroll2pitchyaw(angle_of_attack,roll)
 
 	    local hrot = {x=vrot.x+hpitch,y=vrot.y-hyaw,z=roll}
@@ -358,7 +360,7 @@ function airutils.elevator_auto_correction(self, longit_speed, dtime, max_speed,
     intensity = intensity or 500
     if longit_speed <= 0 then return end
     local factor = 1
-    
+
     if self._elevator_angle > 0 then factor = -1 end
     local ref_speed = longit_speed
     if ref_speed > max_speed then ref_speed = max_speed end
@@ -366,7 +368,7 @@ function airutils.elevator_auto_correction(self, longit_speed, dtime, max_speed,
     local divisor = intensity
     speed_scale = speed_scale / divisor
     local correction = speed_scale * factor * (dtime/ideal_step)
-    
+
     local before_correction = elevator_angle
     local new_elevator_angle = elevator_angle + correction
 

inventory_management.lua

@@ -1,4 +1,4 @@
-local storage = minetest.get_mod_storage()
+local storage = airutils.storage
 airutils.modname = minetest.get_current_modname()
 
 --function to format formspec for mineclone. In case of minetest, just returns an empty string
@@ -19,54 +19,54 @@ local function get_formspec_by_size(self, size)
     end
     local default_inventory_formspecs = {
 	    ["2"]="size[8,6]".. background ..
-	    "list[detached:" .. self._inv_id .. ";main;3.0,0;3,1;]" .. airutils.get_itemslot_bg(3.0, 0, 2, 1) .. 
+	    "list[detached:" .. self._inv_id .. ";main;3.0,0;3,1;]" .. airutils.get_itemslot_bg(3.0, 0, 2, 1) ..
-	    "list[current_player;main;0,2;8,4;]" .. airutils.get_itemslot_bg(0, 2, 8, 4) .. 
+	    "list[current_player;main;0,2;8,4;]" .. airutils.get_itemslot_bg(0, 2, 8, 4) ..
 	    "listring[]",
 
 	    ["3"]="size[8,6]".. background ..
 	    "list[detached:" .. self._inv_id .. ";main;2.5,0;3,1;]" .. airutils.get_itemslot_bg(2.5, 0, 3, 1) ..
-	    "list[current_player;main;0,2;8,4;]" .. airutils.get_itemslot_bg(0, 2, 8, 4) .. 
+	    "list[current_player;main;0,2;8,4;]" .. airutils.get_itemslot_bg(0, 2, 8, 4) ..
 	    "listring[]",
 
 	    ["4"]="size[8,6]".. background ..
 	    "list[detached:" .. self._inv_id .. ";main;2,0;4,1;]" .. airutils.get_itemslot_bg(2.0, 0, 4, 1) ..
-	    "list[current_player;main;0,2;8,4;]" .. airutils.get_itemslot_bg(0, 2, 8, 4) .. 
+	    "list[current_player;main;0,2;8,4;]" .. airutils.get_itemslot_bg(0, 2, 8, 4) ..
 	    "listring[]",
 
 	    ["6"]="size[8,6]".. background ..
 	    "list[detached:" .. self._inv_id .. ";main;1,0;6,1;]".. airutils.get_itemslot_bg(1.0, 0, 6, 1) ..
-	    "list[current_player;main;0,2;8,4;]" .. airutils.get_itemslot_bg(0, 2, 8, 4) .. 
+	    "list[current_player;main;0,2;8,4;]" .. airutils.get_itemslot_bg(0, 2, 8, 4) ..
 	    "listring[]",
 
 	    ["8"]="size[8,6]".. background ..
 	    "list[detached:" .. self._inv_id .. ";main;0,0;8,1;]".. airutils.get_itemslot_bg(0, 0, 8, 1) ..
-	    "list[current_player;main;0,2;8,4;]" .. airutils.get_itemslot_bg(0, 2, 8, 4) .. 
+	    "list[current_player;main;0,2;8,4;]" .. airutils.get_itemslot_bg(0, 2, 8, 4) ..
 	    "listring[]",
 
 	    ["12"]="size[8,7]".. background ..
 	    "list[detached:" .. self._inv_id .. ";main;1,0;6,2;]".. airutils.get_itemslot_bg(1, 0, 6, 2) ..
-	    "list[current_player;main;0,3;8,4;]" .. airutils.get_itemslot_bg(0, 3, 8, 4) .. 
+	    "list[current_player;main;0,3;8,4;]" .. airutils.get_itemslot_bg(0, 3, 8, 4) ..
 	    "listring[]",
 
 	    ["16"]="size[8,7]".. background ..
 	    "list[detached:" .. self._inv_id .. ";main;0,0;8,2;]".. airutils.get_itemslot_bg(0, 0, 8, 2) ..
-	    "list[current_player;main;0,3;8,4;]" .. airutils.get_itemslot_bg(0, 3, 8, 4) .. 
+	    "list[current_player;main;0,3;8,4;]" .. airutils.get_itemslot_bg(0, 3, 8, 4) ..
 	    "listring[]",
 
 	    ["24"]="size[8,8]".. background ..
 	    "list[detached:" .. self._inv_id .. ";main;0,0;8,3;]"..  airutils.get_itemslot_bg(0, 0, 8, 3) ..
-	    "list[current_player;main;0,4;8,4;]" .. airutils.get_itemslot_bg(0, 4, 8, 4) .. 
+	    "list[current_player;main;0,4;8,4;]" .. airutils.get_itemslot_bg(0, 4, 8, 4) ..
 	    "listring[]",
 
 	    ["32"]="size[8,9]".. background ..
 	    "list[detached:" .. self._inv_id .. ";main;0,0.3;8,4;]".. airutils.get_itemslot_bg(0, 0.3, 8, 4) ..
-	    "list[current_player;main;0,5;8,4;]".. airutils.get_itemslot_bg(0, 5, 8, 4) .. 
+	    "list[current_player;main;0,5;8,4;]".. airutils.get_itemslot_bg(0, 5, 8, 4) ..
 	    "listring[]" ..
 	    hotbar,
 
 	    ["50"]="size[10,10]".. background ..
 	    "list[detached:" .. self._inv_id .. ";main;0,0;10,5;]".. airutils.get_itemslot_bg(0, 0, 10, 5) ..
-	    "list[current_player;main;1,6;8,4;]" .. airutils.get_itemslot_bg(1, 6, 8, 4) .. 
+	    "list[current_player;main;1,6;8,4;]" .. airutils.get_itemslot_bg(1, 6, 8, 4) ..
 	    "listring[]",
     }
 
@@ -116,7 +116,7 @@ function airutils.remove_inventory(self)
                 local pos = self.object:get_pos()
                 for k, v in pairs(inv_content) do
                     local count = 0
-                    for i = 0,v:get_count()-1,1 
+                    for i = 0,v:get_count()-1,1
                     do
                         minetest.add_item({x=pos.x+math.random()-0.5,y=pos.y,z=pos.z+math.random()-0.5},v:get_name())
                         count = count + 1
@@ -196,7 +196,7 @@ function airutils.list_inventory(self)
     local inventory = airutils.get_inventory(self)
     if inventory then
         local list = inventory.get_list("main")
-        
+
         minetest.chat_send_all(dump(list))
     end
 end