12 files changed, 50 insertions, 0 deletions
diff --git a/builtin/client/register.lua b/builtin/client/register.lua
index 955655236..c1b4965c1 100644
--- a/builtin/client/register.lua
+++ b/builtin/client/register.lua
@@ -59,6 +59,7 @@ local function make_registration()
 end
 
 core.registered_globalsteps, core.register_globalstep = make_registration()
+core.registered_on_mods_loaded, core.register_on_mods_loaded = make_registration()
 core.registered_on_shutdown, core.register_on_shutdown = make_registration()
 core.registered_on_receiving_chat_message, core.register_on_receiving_chat_message = make_registration()
 core.registered_on_sending_chat_message, core.register_on_sending_chat_message = make_registration()
diff --git a/builtin/game/register.lua b/builtin/game/register.lua
index 15c08b045..6a7c4747f 100644
--- a/builtin/game/register.lua
+++ b/builtin/game/register.lua
@@ -569,6 +569,7 @@ core.unregister_biome = make_wrap_deregistration(core.register_biome, core.clear
 core.registered_on_chat_messages, core.register_on_chat_message = make_registration()
 core.registered_globalsteps, core.register_globalstep = make_registration()
 core.registered_playerevents, core.register_playerevent = make_registration()
+core.registered_on_mods_loaded, core.register_on_mods_loaded = make_registration()
 core.registered_on_shutdown, core.register_on_shutdown = make_registration()
 core.registered_on_punchnodes, core.register_on_punchnode = make_registration()
 core.registered_on_placenodes, core.register_on_placenode = make_registration()
diff --git a/clientmods/preview/init.lua b/clientmods/preview/init.lua
index 223577876..bb8d1d600 100644
--- a/clientmods/preview/init.lua
+++ b/clientmods/preview/init.lua
@@ -200,3 +200,8 @@ core.register_chatcommand("text", {
 		return core.localplayer:hud_change(id, "text", param)
 	end,
 })
+
+
+core.register_on_mods_loaded(function()
+	core.log("Yeah preview mod is loaded with other CSM mods.")
+end)
diff --git a/doc/client_lua_api.txt b/doc/client_lua_api.txt
index bdefa3af5..46b47d892 100644
--- a/doc/client_lua_api.txt
+++ b/doc/client_lua_api.txt
@@ -648,6 +648,8 @@ Call these functions only at load time!
 
 * `minetest.register_globalstep(func(dtime))`
     * Called every client environment step, usually interval of 0.1s
+* `minetest.register_on_mods_loaded(func())`
+    * Called just after mods have finished loading.
 * `minetest.register_on_shutdown(func())`
     * Called before client shutdown
     * **Warning**: If the client terminates abnormally (i.e. crashes), the registered
diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index b89ba47c6..d9cf96800 100644
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -2793,6 +2793,9 @@ Call these functions only at load time!
 
 * `minetest.register_globalstep(func(dtime))`
     * Called every server step, usually interval of 0.1s
+* `minetest.register_on_mods_loaded(func())`
+    * Called after mods have finished loading and before the media is cached or the
+      aliases handled.
 * `minetest.register_on_shutdown(func())`
     * Called before server shutdown
     * **Warning**: If the server terminates abnormally (i.e. crashes), the
diff --git a/games/minimal/mods/experimental/init.lua b/games/minimal/mods/experimental/init.lua
index f4dc78b21..4d5c61488 100644
--- a/games/minimal/mods/experimental/init.lua
+++ b/games/minimal/mods/experimental/init.lua
@@ -765,4 +765,9 @@ minetest.log("experimental modname="..dump(minetest.get_current_modname()))
 minetest.log("experimental modpath="..dump(minetest.get_modpath("experimental")))
 minetest.log("experimental worldpath="..dump(minetest.get_worldpath()))
 
+
+core.register_on_mods_loaded(function()
+	core.log("Yeah experimental loaded mods.")
+end)
+
 -- END
diff --git a/src/client.cpp b/src/client.cpp
index d2f585de7..18e43b1b6 100644
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -172,6 +172,8 @@ void Client::loadMods()
 	for (const ModSpec &mod : m_mods)
 		m_script->loadModFromMemory(mod.name);
 
+	// Run a callback when mods are loaded
+	m_script->on_mods_loaded();
 	m_mods_loaded = true;
 }
 
diff --git a/src/script/cpp_api/s_client.cpp b/src/script/cpp_api/s_client.cpp
index a8d8c2de4..7be4fc6a9 100644
--- a/src/script/cpp_api/s_client.cpp
+++ b/src/script/cpp_api/s_client.cpp
@@ -25,6 +25,17 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "common/c_content.h"
 #include "s_item.h"
 
+void ScriptApiClient::on_mods_loaded()
+{
+	SCRIPTAPI_PRECHECKHEADER
+
+	// Get registered shutdown hooks
+	lua_getglobal(L, "core");
+	lua_getfield(L, -1, "registered_on_mods_loaded");
+	// Call callbacks
+	runCallbacks(0, RUN_CALLBACKS_MODE_FIRST);
+}
+
 void ScriptApiClient::on_shutdown()
 {
 	SCRIPTAPI_PRECHECKHEADER
diff --git a/src/script/cpp_api/s_client.h b/src/script/cpp_api/s_client.h
index 402b44e33..93fe96791 100644
--- a/src/script/cpp_api/s_client.h
+++ b/src/script/cpp_api/s_client.h
@@ -37,6 +37,9 @@ class ClientEnvironment;
 class ScriptApiClient : virtual public ScriptApiBase
 {
 public:
+	// Calls when mods are loaded
+	void on_mods_loaded();
+
 	// Calls on_shutdown handlers
 	void on_shutdown();
 
diff --git a/src/script/cpp_api/s_server.cpp b/src/script/cpp_api/s_server.cpp
index 38bd41f87..b0459fbfa 100644
--- a/src/script/cpp_api/s_server.cpp
+++ b/src/script/cpp_api/s_server.cpp
@@ -147,6 +147,17 @@ bool ScriptApiServer::on_chat_message(const std::string &name,
 	return ate;
 }
 
+void ScriptApiServer::on_mods_loaded()
+{
+	SCRIPTAPI_PRECHECKHEADER
+
+	// Get registered shutdown hooks
+	lua_getglobal(L, "core");
+	lua_getfield(L, -1, "registered_on_mods_loaded");
+	// Call callbacks
+	runCallbacks(0, RUN_CALLBACKS_MODE_FIRST);
+}
+
 void ScriptApiServer::on_shutdown()
 {
 	SCRIPTAPI_PRECHECKHEADER
diff --git a/src/script/cpp_api/s_server.h b/src/script/cpp_api/s_server.h
index 74de19bee..769939d3f 100644
--- a/src/script/cpp_api/s_server.h
+++ b/src/script/cpp_api/s_server.h
@@ -30,6 +30,9 @@ public:
 	// Returns true if script handled message
 	bool on_chat_message(const std::string &name, const std::string &message);
 
+	// Calls when mods are loaded
+	void on_mods_loaded();
+
 	// Calls on_shutdown handlers
 	void on_shutdown();
 
diff --git a/src/server/mods.cpp b/src/server/mods.cpp
index c246e6446..c5616dcd6 100644
--- a/src/server/mods.cpp
+++ b/src/server/mods.cpp
@@ -75,6 +75,9 @@ void ServerModManager::loadMods(ServerScripting *script)
 				std::chrono::steady_clock::now() - t).count() * 0.001f
 			<< " seconds" << std::endl;
 	}
+
+	// Run a callback when mods are loaded
+	script->on_mods_loaded();
 }
 
 // clang-format on