From 4e19791cde6b203ad853905d8c1481c43004a7ea Mon Sep 17 00:00:00 2001
From: Vincent Glize <vincentglize@hotmail.fr>
Date: Mon, 2 Oct 2017 22:09:49 +0200
Subject: [PATCH] [CSM] Add callback on open inventory (#5793)

---
 builtin/client/register.lua     |  1 +
 clientmods/preview/init.lua     |  6 ++++++
 doc/client_lua_api.md           |  4 ++++
 src/game.cpp                    | 13 ++++++++-----
 src/script/cpp_api/s_client.cpp | 21 +++++++++++++++++++++
 src/script/cpp_api/s_client.h   |  2 ++
 6 files changed, 42 insertions(+), 5 deletions(-)

diff --git a/builtin/client/register.lua b/builtin/client/register.lua
index 2b835c744..2da37ad5f 100644
--- a/builtin/client/register.lua
+++ b/builtin/client/register.lua
@@ -73,3 +73,4 @@ core.registered_on_placenode, core.register_on_placenode = make_registration()
 core.registered_on_item_use, core.register_on_item_use = make_registration()
 core.registered_on_modchannel_message, core.register_on_modchannel_message = make_registration()
 core.registered_on_modchannel_signal, core.register_on_modchannel_signal = make_registration()
+core.registered_on_inventory_open, core.register_on_inventory_open = make_registration()
diff --git a/clientmods/preview/init.lua b/clientmods/preview/init.lua
index 630059946..288b1b16c 100644
--- a/clientmods/preview/init.lua
+++ b/clientmods/preview/init.lua
@@ -38,6 +38,12 @@ core.register_on_modchannel_signal(function(channel, signal)
 			.. channel)
 end)
 
+core.register_on_inventory_open(function(inventory)
+	print("INVENTORY OPEN")
+	print(dump(inventory))
+	return false
+end)
+
 core.register_on_placenode(function(pointed_thing, node)
 	print("The local player place a node!")
 	print("pointed_thing :" .. dump(pointed_thing))
diff --git a/doc/client_lua_api.md b/doc/client_lua_api.md
index 4c48b6619..1f50ae362 100644
--- a/doc/client_lua_api.md
+++ b/doc/client_lua_api.md
@@ -689,6 +689,10 @@ Call these functions only at load time!
       join request.
     * If message comes from a server mod, `sender` field is an empty string.
 
+* `minetest.register_on_inventory_open(func(inventory))`
+    * Called when the local player open inventory
+    * Newest functions are called first
+    * If any function returns true, inventory doesn't open
 ### Sounds
 * `minetest.sound_play(spec, parameters)`: returns a handle
     * `spec` is a `SimpleSoundSpec`
diff --git a/src/game.cpp b/src/game.cpp
index 35d0aa9f9..8da789a9e 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -2671,14 +2671,17 @@ void Game::openInventory()
 	infostream << "the_game: " << "Launching inventory" << std::endl;
 
 	PlayerInventoryFormSource *fs_src = new PlayerInventoryFormSource(client);
-	TextDest *txt_dst = new TextDestPlayerInventory(client);
-
-	create_formspec_menu(&current_formspec, client, &input->joystick, fs_src, txt_dst);
-	cur_formname = "";
 
 	InventoryLocation inventoryloc;
 	inventoryloc.setCurrentPlayer();
-	current_formspec->setFormSpec(fs_src->getForm(), inventoryloc);
+
+	if (!client->moddingEnabled()
+			|| !client->getScript()->on_inventory_open(fs_src->m_client->getInventory(inventoryloc))) {
+		TextDest *txt_dst = new TextDestPlayerInventory(client);
+		create_formspec_menu(&current_formspec, client, &input->joystick, fs_src, txt_dst);
+		cur_formname = "";
+		current_formspec->setFormSpec(fs_src->getForm(), inventoryloc);
+	}
 }
 
 
diff --git a/src/script/cpp_api/s_client.cpp b/src/script/cpp_api/s_client.cpp
index b2dcc60c4..c6f7a8e19 100644
--- a/src/script/cpp_api/s_client.cpp
+++ b/src/script/cpp_api/s_client.cpp
@@ -224,6 +224,27 @@ bool ScriptApiClient::on_item_use(const ItemStack &item, const PointedThing &poi
 	return lua_toboolean(L, -1);
 }
 
+bool ScriptApiClient::on_inventory_open(Inventory *inventory)
+{
+	SCRIPTAPI_PRECHECKHEADER
+
+	lua_getglobal(L, "core");
+	lua_getfield(L, -1, "registered_on_inventory_open");
+
+	std::vector<const InventoryList*> lists = inventory->getLists();
+	std::vector<const InventoryList*>::iterator iter = lists.begin();
+	lua_createtable(L, 0, lists.size());
+	for (; iter != lists.end(); iter++) {
+		const char* name = (*iter)->getName().c_str();
+		lua_pushstring(L, name);
+		push_inventory_list(L, inventory, name);
+		lua_rawset(L, -3);
+	}
+
+	runCallbacks(1, RUN_CALLBACKS_MODE_OR);
+	return lua_toboolean(L, -1);
+}
+
 void ScriptApiClient::setEnv(ClientEnvironment *env)
 {
 	ScriptApiBase::setEnv(env);
diff --git a/src/script/cpp_api/s_client.h b/src/script/cpp_api/s_client.h
index 074a68e39..717fbb4cc 100644
--- a/src/script/cpp_api/s_client.h
+++ b/src/script/cpp_api/s_client.h
@@ -57,5 +57,7 @@ public:
 	bool on_placenode(const PointedThing &pointed, const ItemDefinition &item);
 	bool on_item_use(const ItemStack &item, const PointedThing &pointed);
 
+	bool on_inventory_open(Inventory *inventory);
+
 	void setEnv(ClientEnvironment *env);
 };