feat(dtmm): Move class and require hooks into early loading

These need to be executed as early as possible if they're supposed to
capture all of their respective calls.

crates/dtmm/assets/mod_main.lua

@@ -1,3 +1,7 @@
+local _G = _G
+local rawget = rawget
+local rawset = rawset
+
 local log = function(category, format, ...)
     local Log = rawget(_G, "Log")
     if Log then
@@ -7,23 +11,9 @@ local log = function(category, format, ...)
     end
 end
 
-log("mod_main", " Initializing mods...")
+-- Patch `GameStateMachine.init` to add our own state for loading mods.
--- Keep a backup of certain system libraries before
+-- In the future, Fatshark might provide us with a dedicated way to do this.
--- Fatshark's code scrubs them.
+local function patch_mod_loading_state()
--- The loader can then decide to pass them on to mods, or ignore them
-local libs = {
-    io = io,
-    debug = debug,
-    ffi = ffi,
-    os = os,
-    load = load,
-    loadfile = loadfile,
-    loadstring = loadstring,
-}
-
-require("scripts/main")
-log("mod_main", "'scripts/main' loaded")
-
     local StateBootSubStateBase = require("scripts/game_states/boot/state_boot_sub_state_base")
 
     -- A necessary override.
@@ -75,7 +65,7 @@ StateBootLoadMods._state_update = function (self, dt)
             self._mod_loader = mod_loader
 
             local mod_data = require("scripts/mods/mod_data")
-        mod_loader:init(mod_data, libs, self._parent:gui())
+            mod_loader:init(mod_data, self._parent:gui())
         elseif state == "load_mods" and self._mod_loader:update(dt) then
             log("StateBootLoadMods", "Mods loaded, exiting")
             return true, false
@@ -84,10 +74,6 @@ StateBootLoadMods._state_update = function (self, dt)
         return false, false
     end
 
--- Patch `GameStateMachine.init` to add our own state for loading mods.
--- In the future, Fatshark might provide us with a dedicated way to do this.
-local function patch_mod_loading_state()
-    log("mod_main", "Adding mod loading state")
     local GameStateMachine = require("scripts/foundation/utilities/game_state_machine")
 
     local patched = false
@@ -95,6 +81,7 @@ local function patch_mod_loading_state()
     local GameStateMachine_init = GameStateMachine.init
     GameStateMachine.init = function(self, parent, start_state, params, ...)
         if not patched then
+            log("mod_main", "Injecting mod loading state")
             patched = true
 
             -- Hardcoded position after `StateRequireScripts`.
@@ -112,13 +99,94 @@ local function patch_mod_loading_state()
 
         GameStateMachine_init(self, parent, start_state, params, ...)
     end
+
     log("mod_main", "Mod patching complete")
 end
 
+log("mod_main", "Initializing mods...")
+
+local require_store = {}
+
+Mods = {
+    -- Keep a backup of certain system libraries before
+    -- Fatshark's code scrubs them.
+    -- The loader can then decide to pass them on to mods, or ignore them
+    lua = setmetatable({}, {
+        io = io,
+        debug = debug,
+        ffi = ffi,
+        os = os,
+        load = load,
+        loadfile = loadfile,
+        loadstring = loadstring,
+    }),
+    require_store = require_store
+}
+
+local can_insert = function(filepath, new_result)
+    local store = require_store[filepath]
+    if not store or #store then
+        return true
+    end
+
+    if store[#store] ~= new_result then
+        return true
+    end
+end
+
+local original_require = require
+require = function(filepath, ...)
+    local result = original_require(filepath, ...)
+    if result and type(result) == "table" then
+        if can_insert(filepath, result) then
+            require_store[filepath] = require_store[filepath] or {}
+            local store = require_store[filepath]
+
+            table.insert(store, result)
+
+            if Mods.hook then
+                Mods.hook.enable_by_file(filepath, #store)
+            end
+        end
+    end
+
+    return result
+end
+
+require("scripts/boot_init")
+require("scripts/foundation/utilities/class")
+
+-- The `__index` metamethod maps a proper identifier `CLASS.MyClassName` to the
+-- stringified version of the key: `"MyClassName"`.
+-- This allows using LuaCheck for the stringified class names in hook parameters.
+_G.CLASS = setmetatable({}, {
+    __index = function(_, key)
+        return key
+    end
+})
+
+local original_class = class
+class = function(class_name, super_name, ...)
+    local result = original_class(class_name, super_name, ...)
+    if not rawget(_G, class_name) then
+        rawset(_G, class_name, result)
+    end
+    if not rawget(_G.CLASS, class_name) then
+        rawset(_G.CLASS, class_name, result)
+    end
+    return result
+end
+
+require("scripts/main")
+log("mod_main", "'scripts/main' loaded")
+
+-- Override `init` to run our injection
 function init()
+    patch_mod_loading_state()
+
+    -- As requested by Fatshark
     local StateRequireScripts = require("scripts/game_states/boot/state_require_scripts")
     StateRequireScripts._get_is_modded = function() return true end
 
-    patch_mod_loading_state()
     Main:init()
 end