Add minetest.register_on_punchplayer

builtin/game/register.lua

@@ -431,6 +431,7 @@ core.registered_on_crafts, core.register_on_craft = make_registration()
 core.registered_craft_predicts, core.register_craft_predict = make_registration()
 core.registered_on_protection_violation, core.register_on_protection_violation = make_registration()
 core.registered_on_item_eats, core.register_on_item_eat = make_registration()
+core.registered_on_punchplayers, core.register_on_punchplayer = make_registration()
 
 --
 -- Compatibility for on_mapgen_init()

doc/lua_api.txt

@@ -1760,6 +1760,16 @@ Call these functions only at load time!
      * Called after a new player has been created
 * `minetest.register_on_dieplayer(func(ObjectRef))`
      * Called when a player dies
+* `minetest.register_on_punchplayer(func(player, hitter, time_from_last_punch, tool_capabilities, dir, damage))`
+     * Called when a player is punched
+     * `player` - ObjectRef - Player that was punched
+     * `hitter` - ObjectRef - Player that hit
+     * `time_from_last_punch`: Meant for disallowing spamming of clicks (can be nil)
+     * `tool_capabilities`: capability table of used tool (can be nil)
+     * `dir`: unit vector of direction of punch. Always defined. Points from
+       the puncher to the punched.
+     * `damage` - number that represents the damage calculated by the engine
+     * should return `true` to prevent the default damage mechanism
 * `minetest.register_on_respawnplayer(func(ObjectRef))`
      * Called when player is to be respawned
      * Called _before_ repositioning of player occurs
@@ -2282,7 +2292,6 @@ These functions return the leftover itemstack.
 
 * `minetest.forceload_free_block(pos)`
     * stops forceloading the position `pos`
-
 Please note that forceloaded areas are saved when the server restarts.
 
 minetest.global_exists(name)

src/content_sao.cpp

@@ -1012,15 +1012,15 @@ int PlayerSAO::punch(v3f dir,
 	float time_from_last_punch)
 {
 	// It's best that attachments cannot be punched
-	if(isAttached())
+	if (isAttached())
 		return 0;
 
-	if(!toolcap)
+	if (!toolcap)
 		return 0;
 
 	// No effect if PvP disabled
-	if(g_settings->getBool("enable_pvp") == false){
-		if(puncher->getType() == ACTIVEOBJECT_TYPE_PLAYER){
+	if (g_settings->getBool("enable_pvp") == false) {
+		if (puncher->getType() == ACTIVEOBJECT_TYPE_PLAYER) {
 			std::string str = gob_cmd_punched(0, getHP());
 			// create message and add to list
 			ActiveObjectMessage aom(getId(), true, str);
@@ -1034,14 +1034,35 @@ int PlayerSAO::punch(v3f dir,
 
 	std::string punchername = "nil";
 
-	if ( puncher != 0 )
+	if (puncher != 0)
 		punchername = puncher->getDescription();
 
-	actionstream<<"Player "<<m_player->getName()<<" punched by "
-			<<punchername<<", damage "<<hitparams.hp
-			<<" HP"<<std::endl;
+	PlayerSAO *playersao = m_player->getPlayerSAO();
+
+	bool damage_handled = m_env->getScriptIface()->on_punchplayer(playersao,
+				puncher, time_from_last_punch, toolcap, dir,
+				hitparams.hp);
 
-	setHP(getHP() - hitparams.hp);
+	if (!damage_handled) {
+		setHP(getHP() - hitparams.hp);
+	} else { // override client prediction
+		if (puncher->getType() == ACTIVEOBJECT_TYPE_PLAYER) {
+			std::string str = gob_cmd_punched(0, getHP());
+			// create message and add to list
+			ActiveObjectMessage aom(getId(), true, str);
+			m_messages_out.push(aom);
+		}
+	}
+
+
+	actionstream << "Player " << m_player->getName() << " punched by "
+			<< punchername;
+	if (!damage_handled) {
+		actionstream << ", damage " << hitparams.hp << " HP";
+	} else {
+		actionstream << ", damage handled by lua";
+	}
+	actionstream << std::endl;
 
 	return hitparams.wear;
 }

src/script/cpp_api/s_internal.h

@@ -61,3 +61,4 @@ bool* m_variable;
 		StackUnroller stack_unroller(L);
 
 #endif /* S_INTERNAL_H_ */
+

src/script/cpp_api/s_player.cpp

@@ -19,6 +19,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "cpp_api/s_player.h"
 #include "cpp_api/s_internal.h"
+#include "common/c_converter.h"
+#include "common/c_content.h"
 #include "util/string.h"
 
 void ScriptApiPlayer::on_newplayer(ServerActiveObject *player)
@@ -45,6 +47,28 @@ void ScriptApiPlayer::on_dieplayer(ServerActiveObject *player)
 	script_run_callbacks(L, 1, RUN_CALLBACKS_MODE_FIRST);
 }
 
+bool ScriptApiPlayer::on_punchplayer(ServerActiveObject *player,
+		ServerActiveObject *hitter,
+		float time_from_last_punch,
+		const ToolCapabilities *toolcap,
+		v3f dir,
+		s16 damage)
+{
+	SCRIPTAPI_PRECHECKHEADER
+	// Get core.registered_on_punchplayers
+	lua_getglobal(L, "core");
+	lua_getfield(L, -1, "registered_on_punchplayers");
+	// Call callbacks
+	objectrefGetOrCreate(L, player);
+	objectrefGetOrCreate(L, hitter);
+	lua_pushnumber(L, time_from_last_punch);
+	push_tool_capabilities(L, *toolcap);
+	push_v3f(L, dir);
+	lua_pushnumber(L, damage);
+	script_run_callbacks(L, 6, RUN_CALLBACKS_MODE_OR);
+	return lua_toboolean(L, -1);
+}
+
 bool ScriptApiPlayer::on_respawnplayer(ServerActiveObject *player)
 {
 	SCRIPTAPI_PRECHECKHEADER

src/script/cpp_api/s_player.h

@@ -23,7 +23,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <map>
 
 #include "cpp_api/s_base.h"
+#include "irr_v3d.h"
 
+struct ToolCapabilities;
 
 class ScriptApiPlayer
 		: virtual public ScriptApiBase
@@ -38,6 +40,9 @@ class ScriptApiPlayer
 	void on_joinplayer(ServerActiveObject *player);
 	void on_leaveplayer(ServerActiveObject *player);
 	void on_cheat(ServerActiveObject *player, const std::string &cheat_type);
+	bool on_punchplayer(ServerActiveObject *player, 
+		ServerActiveObject *hitter, float time_from_last_punch,
+		const ToolCapabilities *toolcap, v3f dir, s16 damage);
 
 	void on_playerReceiveFields(ServerActiveObject *player,
 			const std::string &formname,