planet_prison: fix global variable miussage.

Fixes some 'global' variable missusage.

maps/planet_prison.lua

@@ -221,6 +221,12 @@ global.this.bp = {
    merchant = require("planet_prison.bp.merchant")
 }
 local function init_game()
+   _common.init()
+   _layers.init()
+   _bp.init()
+   _ai.init()
+   _timers.init()
+
    local map = pick_map()
    local preset = global.this.presets[map.name]
    global.this.surface = game.create_surface("arena", map)
@@ -234,8 +240,6 @@ local function init_game()
    game.difficulty_settings.technology_price_multiplier = 0.1
    game.difficulty_settings.research_queue_setting = "always"
 
-   _timers.init()
-   _layers.init()
    _layers.set_collision_mask({"water-tile"})
 
    for _, layer in pairs(preset) do
@@ -324,6 +328,7 @@ local function do_spawn_point(player)
          layers = _layers,
          common = _common,
          timers = _timers,
+         func = _bp.destroy_reference,
       },
       surf = player.surface,
    }

maps/planet_prison/mod/ai.lua

@@ -1,9 +1,6 @@
-local public, this = {}, {}
-local _global = require("utils.global")
+local public = {}
 local _common = require(".common")
 
-_global.register(this, function(t) this = t end)
-
 public.command = {
    --[[
       @param args nil
@@ -16,6 +13,15 @@ public.command = {
    seek_and_destroy_player = 1,
 }
 
+--[[
+init - Initialize the module.
+--]]
+public.init = function()
+   if global.this == nil then
+      global.this = {}
+   end
+end
+
 local function _get_direction(src, dest)
    local src_x = _common.get_axis(src, "x")
    local src_y = _common.get_axis(src, "y")

maps/planet_prison/mod/bp.lua

@@ -1,9 +1,13 @@
-local this, public = {}, {}
-local _global = require("utils.global")
+local public = {}
 local _common = require(".common")
 
-_global.register(this, function(t) this = t end)
-this._bps = {}
+public.init = function()
+   if global.this == nil then
+      global.this = {}
+   end
+
+   global.this._bps = {}
+end
 
 --[[
 push_blueprint - Pushes blueprint into a list.
@@ -16,7 +20,7 @@ public.push_blueprint = function(name, bp)
       hook = nil,
       refs = {}
    }
-   this._bps[name] = entry
+   global.this._bps[name] = entry
 end
 
 --[[
@@ -30,12 +34,12 @@ public.set_blueprint_hook = function(name, hook)
       return
    end
 
-   if this._bps[name] == nil then
+   if global.this._bps[name] == nil then
       log("bp.set_blueprint_hook: unrecognized blueprint")
       return
    end
 
-   this._bps[name].hook = hook
+   global.this._bps[name].hook = hook
 end
 
 --[[
@@ -48,7 +52,7 @@ public.get_references = function(name)
       return {}
    end
 
-   local object = this._bps[name]
+   local object = global.this._bps[name]
    if object == nil then
       log("bp.get_references: unrecognized blueprint")
       return {}
@@ -67,7 +71,7 @@ public.get_references = function(name)
       return
    end
 
-   local object = this._bps[name]
+   local object = global.this._bps[name]
    if object == nil then
       log("bp.get_references: unrecognized blueprint")
       return
@@ -116,7 +120,7 @@ public.unlink_references_filtered = function(name, query)
       return
    end
 
-   local object = this._bps[name]
+   local object = global.this._bps[name]
    if object == nil then
       log("bp.get_references: unrecognized blueprint")
       return
@@ -154,7 +158,7 @@ public.destroy_references_filtered = function(surf, name, query)
       return
    end
 
-   local object = this._bps[name]
+   local object = global.this._bps[name]
    if object == nil then
       log("bp.get_references: unrecognized blueprint")
       return
@@ -196,7 +200,7 @@ public.destroy_references = function(surf, name)
    public.destroy_references_filtered(surf, name, {})
 end
 
-local function _destroy_reference(surf, ref)
+global._bp_destroy_reference = function(surf, ref)
    for _, ent in pairs(ref.entities) do
       if ent.valid then
          ent.destroy()
@@ -223,11 +227,11 @@ destroy_reference - Destroys reference of a blueprint at given surface.
 @param reference - Any valid reference.
 --]]
 public.destroy_reference = function(surf, reference)
-   for _, meta in pairs(this._bps) do
+   for _, meta in pairs(global.this._bps) do
       for i = 1, #meta.refs do
          local ref = meta.refs[i]
          if reference.id == ref.id then
-            _destroy_reference(surf, ref)
+            global._bp_destroy_reference(surf, ref)
             table.remove(meta.refs, i)
             return
          end
@@ -301,7 +305,7 @@ public.build = function(surf, name, point, args)
       return
    end
 
-   local object = this._bps[name]
+   local object = global.this._bps[name]
    if object == nil then
       log("bp.set_blueprint_hook: unrecognized blueprint")
       return

maps/planet_prison/mod/common.lua

@@ -1,7 +1,10 @@
 local public = {}
-local _global = require("utils.global")
-global.this = {}
-_global.register(global.this, function(t) global.this = t end)
+
+public.init = function()
+   if global.this == nil then
+      global.this = {}
+   end
+end
 
 --[[
 rand_range - Return random integer within the range.

maps/planet_prison/mod/layers.lua

@@ -1,16 +1,16 @@
 local public = {}
-global.this = {}
-local _global = require("utils.global")
 local _common = require(".common")
 local _simplex = require(".simplex_noise")
 
-_global.register(global.this, function(t) global.this = t end)
-global.this._grid = {}
-global.this._exclusions = {}
-global.this._layers = {}
-global.this._collision_mask = {}
-
 public.init = function()
+   if global.this == nil then
+      global.this = {}
+   end
+
+   global.this._grid = {}
+   global.this._exclusions = {}
+   global.this._layers = {}
+   global.this._collision_mask = {}
    _simplex.init()
 end
 --[[

maps/planet_prison/mod/timers.lua

@@ -1,5 +1,5 @@
 local public = {}
-local _global = require("utils.global")
+local _global = require('utils.global')
 
 public.init = function()
    if global.this == nil then