Add peaceful / not peaceful distinction in mobs and the only_peaceful_mobs setting

minetest.conf.example

@@ -122,6 +122,8 @@ screenH# = 600
 #creative_mode = false
 # Enable players getting damage and dying
 #enable_damage = false
+# Despawn all non-peaceful mobs
+#only_peaceful_mobs = false
 # A chosen map seed for a new map, leave empty for random
 #fixed_map_seed =
 # Gives some stuff to players at the beginning

src/content_sao.cpp

@@ -1370,6 +1370,11 @@ u16 MobV2SAO::punch(const std::string &toolname, v3f dir,
 	return 65536/100;
 }
 
+bool MobV2SAO::isPeaceful()
+{
+	return m_properties->getBool("is_peaceful");
+}
+
 void MobV2SAO::sendPosition()
 {
 	m_last_sent_position = m_base_position;
@@ -1388,6 +1393,7 @@ void MobV2SAO::sendPosition()
 
 void MobV2SAO::setPropertyDefaults()
 {
+	m_properties->setDefault("is_peaceful", "false");
 	m_properties->setDefault("move_type", "ground_nodes");
 	m_properties->setDefault("speed", "(0,0,0)");
 	m_properties->setDefault("age", "0");

src/content_sao.h

@@ -97,6 +97,7 @@ public:
 	std::string getStaticData();
 	InventoryItem* createPickedUpItem(){return NULL;}
 	u16 punch(const std::string &toolname, v3f dir);
+	bool isPeaceful(){return false;}
 private:
 	void doDamage(u16 d);
 
@@ -157,6 +158,7 @@ public:
 	InventoryItem* createPickedUpItem(){return NULL;}
 	u16 punch(const std::string &toolname, v3f dir,
 			const std::string &playername);
+	bool isPeaceful();
 private:
 	void sendPosition();
 	void setPropertyDefaults();

src/defaultsettings.cpp

@@ -83,6 +83,7 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("strict_protocol_version_checking", "true");
 	settings->setDefault("creative_mode", "false");
 	settings->setDefault("enable_damage", "true");
+	settings->setDefault("only_peaceful_mobs", "false");
 	settings->setDefault("fixed_map_seed", "");
 	settings->setDefault("give_initial_stuff", "false");
 	settings->setDefault("default_password", "");

src/environment.cpp

@@ -1039,6 +1039,11 @@ void ServerEnvironment::step(float dtime)
 				i.atEnd()==false; i++)
 		{
 			ServerActiveObject* obj = i.getNode()->getValue();
+			// Remove non-peaceful mobs on peaceful mode
+			if(g_settings->getBool("only_peaceful_mobs")){
+				if(!obj->isPeaceful())
+					obj->m_removed = true;
+			}
 			// Don't step if is to be removed or stored statically
 			if(obj->m_removed || obj->m_pending_deactivation)
 				continue;

src/serverobject.h

@@ -111,6 +111,8 @@ public:
 	/*
 	*/
 	virtual void rightClick(Player *player){}
+
+	virtual bool isPeaceful(){return true;}
 	
 	/*
 		Number of players which know about this object. Object won't be