formspec API: add on_sending_*_fields

(register/ed)_on_sending_(inventory/nodemeta)_fields
Could be useful for translating field values? No clue, sure we'll find a use :]

builtin/client/register.lua

@@ -107,3 +107,5 @@ core.registered_on_nodemeta_form_open, core.register_on_nodemeta_form_open = mak
 core.registered_on_recieve_physics_override, core.register_on_recieve_physics_override = make_registration()
 core.registered_on_play_sound, core.register_on_play_sound = make_registration()
 core.registered_on_spawn_particle, core.register_on_spawn_particle = make_registration()
+core.registered_on_sending_inventory_fields, core.register_on_sending_inventory_fields = make_registration()
+core.registered_on_sending_nodemeta_fields, core.register_on_sending_nodemeta_fields = make_registration()

src/client/client.cpp

@@ -1149,6 +1149,9 @@ void Client::sendNodemetaFields(v3s16 p, const std::string &formname,
 
 	FATAL_ERROR_IF(fields_size > 0xFFFF, "Unsupported number of nodemeta fields");
 
+	if (m_script->on_sending_nodemeta_fields(p, formname, fields))
+		return;
+
 	NetworkPacket pkt(TOSERVER_NODEMETA_FIELDS, 0);
 
 	pkt << p << formname << (u16) (fields_size & 0xFFFF);
@@ -1170,6 +1173,9 @@ void Client::sendInventoryFields(const std::string &formname,
 	size_t fields_size = fields.size();
 	FATAL_ERROR_IF(fields_size > 0xFFFF, "Unsupported number of inventory fields");
 
+	if (m_script->on_sending_inventory_fields(formname, fields))
+		return;
+
 	NetworkPacket pkt(TOSERVER_INVENTORY_FIELDS, 0);
 	pkt << formname << (u16) (fields_size & 0xFFFF);
 

src/script/cpp_api/s_client.cpp

@@ -346,6 +346,59 @@ bool ScriptApiClient::on_nodemeta_form_open(v3s16 position, std::string formname
 	return readParam<bool>(L, -1);
 }
 
+bool ScriptApiClient::on_sending_inventory_fields(const std::string &formname,
+	const StringMap &fields)
+{
+	SCRIPTAPI_PRECHECKHEADER
+
+	// Get core.registered_on_chat_messages
+	lua_getglobal(L, "core");
+	lua_getfield(L, -1, "registered_on_sending_inventory_fields");
+	// Call callbacks
+	// param 1
+	lua_pushstring(L, formname.c_str());
+	// param 2
+	lua_newtable(L);
+	StringMap::const_iterator it;
+	for (it = fields.begin(); it != fields.end(); ++it) {
+		const std::string &name = it->first;
+		const std::string &value = it->second;
+		lua_pushstring(L, name.c_str());
+		lua_pushlstring(L, value.c_str(), value.size());
+		lua_settable(L, -3);
+	}
+	runCallbacks(2, RUN_CALLBACKS_MODE_OR);
+	return readParam<bool>(L, -1);
+}
+
+bool ScriptApiClient::on_sending_nodemeta_fields(v3s16 position,
+	const std::string &formname,
+	const StringMap &fields)
+{
+	SCRIPTAPI_PRECHECKHEADER
+
+	// Get core.registered_on_chat_messages
+	lua_getglobal(L, "core");
+	lua_getfield(L, -1, "registered_on_sending_nodemeta_fields");
+	// Call callbacks
+	// param 1
+	push_v3s16(L, position);
+	// param 2
+	lua_pushstring(L, formname.c_str());
+	// param 3
+	lua_newtable(L);
+	StringMap::const_iterator it;
+	for (it = fields.begin(); it != fields.end(); ++it) {
+		const std::string &name = it->first;
+		const std::string &value = it->second;
+		lua_pushstring(L, name.c_str());
+		lua_pushlstring(L, value.c_str(), value.size());
+		lua_settable(L, -3);
+	}
+	runCallbacks(3, RUN_CALLBACKS_MODE_OR);
+	return readParam<bool>(L, -1);
+}
+
 void ScriptApiClient::setEnv(ClientEnvironment *env)
 {
 	ScriptApiBase::setEnv(env);

src/script/cpp_api/s_client.h

@@ -68,5 +68,10 @@ public:
 	bool on_receiving_inventory_form(std::string formname, std::string formspec);
 	bool on_nodemeta_form_open(v3s16 position, std::string formname, std::string formspec);
 
+	bool on_sending_inventory_fields(const std::string &formname,
+			const StringMap &fields);
+	bool on_sending_nodemeta_fields(v3s16 position,
+			const std::string &formname, const StringMap &fields);
+
 	void setEnv(ClientEnvironment *env);
 };