Call this 0.4.dev-20111204-1

CMakeLists.txt

@@ -10,7 +10,7 @@ project(minetest)
 # Also remember to set PROTOCOL_VERSION in clientserver.h when releasing
 set(VERSION_MAJOR 0)
 set(VERSION_MINOR 4)
-set(VERSION_PATCH dev-20111203-3)
+set(VERSION_PATCH dev-20111204-1)
 set(VERSION_STRING "${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH}")
 
 MESSAGE(STATUS "*** Will build version ${VERSION_STRING} ***")

data/builtin.lua

@@ -340,6 +340,77 @@ minetest.craftitem_eat = function(hp_change)
 	end
 end
 
+--
+-- Default material types
+--
+
+function minetest.digprop_constanttime(time)
+	return {
+		diggability = "constant",
+		constant_time = time,
+	}
+end
+
+function minetest.digprop_stonelike(toughness)
+	return {
+		diggablity = "normal",
+		weight = toughness * 5,
+		crackiness = 1,
+		crumbliness = -0.1,
+		cuttability = -0.2,
+	}
+end
+
+function minetest.digprop_dirtlike(toughness)
+	return {
+		diggablity = "normal",
+		weight = toughness * 1.2,
+		crackiness = 0,
+		crumbliness = 1.2,
+		cuttability = -0.4,
+	}
+end
+
+function minetest.digprop_gravellike(toughness)
+	return {
+		diggablity = "normal",
+		weight = toughness * 2,
+		crackiness = 0.2,
+		crumbliness = 1.5,
+		cuttability = -1.0,
+	}
+end
+
+function minetest.digprop_woodlike(toughness)
+	return {
+		diggablity = "normal",
+		weight = toughness * 1.0,
+		crackiness = 0.75,
+		crumbliness = -1.0,
+		cuttability = 1.5,
+	}
+end
+
+function minetest.digprop_leaveslike(toughness)
+	return {
+		diggablity = "normal",
+		weight = toughness * (-0.5),
+		crackiness = 0,
+		crumbliness = 0,
+		cuttability = 2.0,
+	}
+end
+
+function minetest.digprop_glasslike(toughness)
+	return {
+		diggablity = "normal",
+		weight = toughness * 0.1,
+		crackiness = 2.0,
+		crumbliness = -1.0,
+		cuttability = -1.0,
+	}
+end
+
 --
 -- Creative inventory
 --

data/mods/bucket/init.lua

@@ -1,3 +1,10 @@
+-- bucket (Minetest 0.4 mod)
+-- A bucket, which can pick up water and lava
+
+minetest.alias_craftitem("bucket", "bucket:bucket_empty")
+minetest.alias_craftitem("bucket_water", "bucket:bucket_water")
+minetest.alias_craftitem("bucket_lava", "bucket:bucket_lava")
+
 minetest.register_craft({
 	output = 'craft "bucket:bucket_empty" 1',
 	recipe = {
@@ -14,11 +21,11 @@ minetest.register_craftitem("bucket:bucket_empty", {
 	on_use = function(item, player, pointed_thing)
 		if pointed_thing.type == "node" then
 			n = minetest.env:get_node(pointed_thing.under)
-			if n.name == "water_source" then
+			if n.name == "default:water_source" then
 				minetest.env:add_node(pointed_thing.under, {name="air"})
 				player:add_to_inventory_later('craft "bucket:bucket_water" 1')
 				return true
-			elseif n.name == "lava_source" then
+			elseif n.name == "default:lava_source" then
 				minetest.env:add_node(pointed_thing.under, {name="air"})
 				player:add_to_inventory_later('craft "bucket:bucket_lava" 1')
 				return true
@@ -29,19 +36,19 @@ minetest.register_craftitem("bucket:bucket_empty", {
 })
 
 minetest.register_craftitem("bucket:bucket_water", {
-	image = "bucket:bucket_water.png",
+	image = "bucket_water.png",
 	stack_max = 1,
 	liquids_pointable = true,
 	on_place_on_ground = minetest.craftitem_place_item,
 	on_use = function(item, player, pointed_thing)
 		if pointed_thing.type == "node" then
 			n = minetest.env:get_node(pointed_thing.under)
-			if n.name == "water_source" then
+			if n.name == "default:water_source" then
 				-- unchanged
-			elseif n.name == "water_flowing" or n.name == "lava_source" or n.name == "lava_flowing" then
-				minetest.env:add_node(pointed_thing.under, {name="water_source"})
+			elseif n.name == "default:water_flowing" or n.name == "default:lava_source" or n.name == "default:lava_flowing" then
+				minetest.env:add_node(pointed_thing.under, {name="default:water_source"})
 			else
-				minetest.env:add_node(pointed_thing.above, {name="water_source"})
+				minetest.env:add_node(pointed_thing.above, {name="default:water_source"})
 			end
 			player:add_to_inventory_later('craft "bucket:bucket_empty" 1')
 			return true
@@ -51,19 +58,19 @@ minetest.register_craftitem("bucket:bucket_water", {
 })
 
 minetest.register_craftitem("bucket:bucket_lava", {
-	image = "bucket:bucket_lava.png",
+	image = "bucket_lava.png",
 	stack_max = 1,
 	liquids_pointable = true,
 	on_place_on_ground = minetest.craftitem_place_item,
 	on_use = function(item, player, pointed_thing)
 		if pointed_thing.type == "node" then
 			n = minetest.env:get_node(pointed_thing.under)
-			if n.name == "lava_source" then
+			if n.name == "default:lava_source" then
 				-- unchanged
-			elseif n.name == "water_source" or n.name == "water_flowing" or n.name == "lava_flowing" then
-				minetest.env:add_node(pointed_thing.under, {name="lava_source"})
+			elseif n.name == "default:water_source" or n.name == "default:water_flowing" or n.name == "default:lava_flowing" then
+				minetest.env:add_node(pointed_thing.under, {name="default:lava_source"})
 			else
-				minetest.env:add_node(pointed_thing.above, {name="lava_source"})
+				minetest.env:add_node(pointed_thing.above, {name="default:lava_source"})
 			end
 			player:add_to_inventory_later('craft "bucket:bucket_empty" 1')
 			return true

data/mods/experimental/init.lua

@@ -5,26 +5,22 @@
 -- An example furnace-thing implemented in Lua
 
 minetest.register_node("experimental:luafurnace", {
-	tile_images = {"lava.png", "furnace_side.png", "furnace_side.png",
-		"furnace_side.png", "furnace_side.png", "furnace_front.png"},
+	tile_images = {"default_lava.png", "default_furnace_side.png",
+		"default_furnace_side.png", "default_furnace_side.png",
+		"default_furnace_side.png", "default_furnace_front.png"},
 	--inventory_image = "furnace_front.png",
-	inventory_image = minetest.inventorycube("furnace_front.png"),
+	inventory_image = minetest.inventorycube("default_furnace_front.png"),
 	paramtype = "facedir_simple",
 	metadata_name = "generic",
-	material = digprop_stonelike(3.0),
+	material = minetest.digprop_stonelike(3.0),
 })
 
 minetest.register_on_placenode(function(pos, newnode, placer)
 	if newnode.name == "experimental:luafurnace" then
-		print("get_meta");
 		local meta = minetest.env:get_meta(pos)
-		print("inventory_set_list");
 		meta:inventory_set_list("fuel", {""})
-		print("inventory_set_list");
 		meta:inventory_set_list("src", {""})
-		print("inventory_set_list");
 		meta:inventory_set_list("dst", {"","","",""})
-		print("set_inventory_draw_spec");
 		meta:set_inventory_draw_spec(
 			"invsize[8,9;]"
 			.."list[current_name;fuel;2,3;1,1;]"
@@ -34,9 +30,7 @@ minetest.register_on_placenode(function(pos, newnode, placer)
 		)
 		
 		local total_cooked = 0;
-		print("set_string")
 		meta:set_string("total_cooked", total_cooked)
-		print("set_infotext");
 		meta:set_infotext("Lua Furnace: total cooked: "..total_cooked)
 	end
 end)
@@ -99,9 +93,9 @@ minetest.register_abm({
 minetest.register_craft({
 	output = 'node "experimental:luafurnace" 1',
 	recipe = {
-		{'node "cobble"', 'node "cobble"', 'node "cobble"'},
-		{'node "cobble"', 'node "cobble"', 'node "cobble"'},
-		{'node "cobble"', 'node "cobble"', 'node "cobble"'},
+		{'node "default:cobble"', 'node "default:cobble"', 'node "default:cobble"'},
+		{'node "default:cobble"', 'node "default:steel_ingot"', 'node "default:cobble"'},
+		{'node "default:cobble"', 'node "default:cobble"', 'node "default:cobble"'},
 	}
 })
 
@@ -110,8 +104,8 @@ minetest.register_craft({
 --
 
 --[[
-minetest.register_tool("horribletool", {
-	image = "lava.png",
+minetest.register_tool("experimental:horribletool", {
+	image = "default_lava.png",
 	basetime = 2.0
 	dt_weight = 0.2
 	dt_crackiness = 0.2
@@ -125,10 +119,10 @@ minetest.register_tool("horribletool", {
 })
 --]]
 
-minetest.register_craft({
+--[[minetest.register_craft({
 	output = 'node "somenode" 4',
 	recipe = {
-		{'craft "Stick" 1'},
+		{'craft "default_tick" 1'},
 	}
 })
 
@@ -145,7 +139,7 @@ minetest.register_node("experimental:somenode", {
 		flammability = 0
 	},
 	metadata_name = "chest",
-})
+})]]
 
 --
 -- TNT (not functional)
@@ -154,15 +148,18 @@ minetest.register_node("experimental:somenode", {
 minetest.register_craft({
 	output = 'node "experimental:tnt" 4',
 	recipe = {
-		{'node "wood" 1'},
-		{'craft "lump_of_coal" 1'},
-		{'node "wood" 1'}
+		{'node "default:wood" 1'},
+		{'craft "default:coal_lump" 1'},
+		{'node "default:wood" 1'}
 	}
 })
 
 minetest.register_node("experimental:tnt", {
-	tile_images = {"tnt_top.png", "tnt_bottom.png", "tnt_side.png", "tnt_side.png", "tnt_side.png", "tnt_side.png"},
-	inventory_image = "tnt_side.png",
+	tile_images = {"default_tnt_top.png", "default_tnt_bottom.png",
+			"default_tnt_side.png", "default_tnt_side.png",
+			"default_tnt_side.png", "default_tnt_side.png"},
+	inventory_image = minetest.inventorycube("default_tnt_top.png",
+			"default_tnt_side.png", "default_tnt_side.png"),
 	dug_item = '', -- Get nothing
 	material = {
 		diggability = "not",
@@ -183,7 +180,9 @@ local TNT = {
 	-- weight = 5,
 	collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
 	visual = "cube",
-	textures = {"tnt_top.png","tnt_bottom.png","tnt_side.png","tnt_side.png","tnt_side.png","tnt_side.png"},
+	textures = {"default_tnt_top.png", "default_tnt_bottom.png",
+			"default_tnt_side.png", "default_tnt_side.png",
+			"default_tnt_side.png", "default_tnt_side.png"},
 	-- Initial value for our timer
 	timer = 0,
 	-- Number of punches required to defuse
@@ -288,8 +287,8 @@ minetest.register_on_generated(function(minp, maxp)
 end)
 
 -- Example setting get
-print("setting max_users = " .. dump(minetest.setting_get("max_users")))
-print("setting asdf = " .. dump(minetest.setting_get("asdf")))
+--print("setting max_users = " .. dump(minetest.setting_get("max_users")))
+--print("setting asdf = " .. dump(minetest.setting_get("asdf")))
 
 minetest.register_on_chat_message(function(name, message)
 	--[[print("on_chat_message: name="..dump(name).." message="..dump(message))

data/mods/legacy/depends.txt

@@ -0,0 +1,2 @@
+default
+

data/mods/legacy/init.lua

@@ -0,0 +1,100 @@
+-- legacy (Minetest 0.4 mod)
+-- Provides as much backwards-compatibility as feasible
+
+--
+-- Aliases to support loading 0.3 and old 0.4 worlds and inventories
+--
+
+minetest.alias_node("stone", "default:stone")
+minetest.alias_node("dirt_with_grass", "default:dirt_with_grass")
+minetest.alias_node("dirt_with_grass_footsteps", "default:dirt_with_grass_footsteps")
+minetest.alias_node("dirt", "default:dirt")
+minetest.alias_node("sand", "default:sand")
+minetest.alias_node("gravel", "default:gravel")
+minetest.alias_node("sandstone", "default:sandstone")
+minetest.alias_node("clay", "default:clay")
+minetest.alias_node("brick", "default:brick")
+minetest.alias_node("tree", "default:tree")
+minetest.alias_node("jungletree", "default:jungletree")
+minetest.alias_node("junglegrass", "default:junglegrass")
+minetest.alias_node("leaves", "default:leaves")
+minetest.alias_node("cactus", "default:cactus")
+minetest.alias_node("papyrus", "default:papyrus")
+minetest.alias_node("bookshelf", "default:bookshelf")
+minetest.alias_node("glass", "default:glass")
+minetest.alias_node("wooden_fence", "default:fence_wood")
+minetest.alias_node("rail", "default:rail")
+minetest.alias_node("ladder", "default:ladder")
+minetest.alias_node("wood", "default:wood")
+minetest.alias_node("mese", "default:mese")
+minetest.alias_node("cloud", "default:cloud")
+minetest.alias_node("water_flowing", "default:water_flowing")
+minetest.alias_node("water_source", "default:water_source")
+minetest.alias_node("lava_flowing", "default:lava_flowing")
+minetest.alias_node("lava_source", "default:lava_source")
+minetest.alias_node("torch", "default:torch")
+minetest.alias_node("sign_wall", "default:sign_wall")
+minetest.alias_node("chest", "default:chest")
+minetest.alias_node("locked_chest", "default:chest_locked")
+minetest.alias_node("cobble", "default:cobble")
+minetest.alias_node("mossycobble", "default:mossycobble")
+minetest.alias_node("steelblock", "default:steelblock")
+minetest.alias_node("nyancat", "default:nyancat")
+minetest.alias_node("nyancat_rainbow", "default:nyancat_rainbow")
+minetest.alias_node("sapling", "default:sapling")
+minetest.alias_node("apple", "default:apple")
+
+minetest.alias_tool("WPick", "default:pick_wood")
+minetest.alias_tool("STPick", "default:pick_stone")
+minetest.alias_tool("SteelPick", "default:pick_steel")
+minetest.alias_tool("MesePick", "default:pick_mese")
+minetest.alias_tool("WShovel", "default:shovel_wood")
+minetest.alias_tool("STShovel", "default:shovel_stone")
+minetest.alias_tool("SteelShovel", "default:shovel_steel")
+minetest.alias_tool("WAxe", "default:axe_wood")
+minetest.alias_tool("STAxe", "default:axe_stone")
+minetest.alias_tool("SteelAxe", "default:axe_steel")
+minetest.alias_tool("WSword", "default:sword_wood")
+minetest.alias_tool("STSword", "default:sword_stone")
+minetest.alias_tool("SteelSword", "default:sword_steel")
+
+minetest.alias_craftitem("Stick", "default:stick")
+minetest.alias_craftitem("paper", "default:paper")
+minetest.alias_craftitem("book", "default:book")
+minetest.alias_craftitem("lump_of_coal", "default:coal_lump")
+minetest.alias_craftitem("lump_of_iron", "default:iron_lump")
+minetest.alias_craftitem("lump_of_clay", "default:clay_lump")
+minetest.alias_craftitem("steel_ingot", "default:steel_ingot")
+minetest.alias_craftitem("clay_brick", "default:clay_brick")
+minetest.alias_craftitem("scorched_stuff", "default:scorched_stuff")
+minetest.alias_craftitem("apple", "default:apple")
+
+--
+-- Old items
+--
+
+minetest.register_craftitem(":rat", {
+	image = "rat.png",
+	cookresult_itemstring = 'craft "cooked_rat" 1',
+	on_drop = function(item, dropper, pos)
+		minetest.env:add_rat(pos)
+		return true
+	end,
+})
+
+minetest.register_craftitem(":cooked_rat", {
+	image = "cooked_rat.png",
+	cookresult_itemstring = 'craft "scorched_stuff" 1',
+	on_place_on_ground = minetest.craftitem_place_item,
+	on_use = minetest.craftitem_eat(6),
+})
+
+minetest.register_craftitem(":firefly", {
+	image = "firefly.png",
+	on_drop = function(item, dropper, pos)
+		minetest.env:add_firefly(pos)
+		return true
+	end,
+})
+
+-- END

src/content_cao.cpp

@@ -183,12 +183,16 @@ class ItemCAO : public ClientActiveObject
 		{return &m_selection_box;}
 	v3f getPosition()
 		{return m_position;}
+	
+	std::string infoText()
+		{return m_infotext;}
 
 private:
 	core::aabbox3d<f32> m_selection_box;
 	scene::IMeshSceneNode *m_node;
 	v3f m_position;
 	std::string m_inventorystring;
+	std::string m_infotext;
 };
 
 /*
@@ -530,7 +534,10 @@ ItemCAO::ItemCAO(IGameDef *gamedef, ClientEnvironment *env):
 	m_node(NULL),
 	m_position(v3f(0,10*BS,0))
 {
-	ClientActiveObject::registerType(getType(), create);
+	if(!gamedef && !env)
+	{
+		ClientActiveObject::registerType(getType(), create);
+	}
 }
 
 ItemCAO::~ItemCAO()
@@ -569,9 +576,8 @@ void ItemCAO::addToScene(scene::ISceneManager *smgr, ITextureSource *tsrc,
 	// Set material
 	buf->getMaterial().setFlag(video::EMF_LIGHTING, false);
 	buf->getMaterial().setFlag(video::EMF_BACK_FACE_CULLING, false);
-	//buf->getMaterial().setTexture(0, NULL);
-	// Initialize with the stick texture
-	buf->getMaterial().setTexture(0, tsrc->getTextureRaw("stick.png"));
+	// Initialize with a generated placeholder texture
+	buf->getMaterial().setTexture(0, tsrc->getTextureRaw(""));
 	buf->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, false);
 	buf->getMaterial().setFlag(video::EMF_FOG_ENABLE, true);
 	buf->getMaterial().MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
@@ -694,6 +700,23 @@ void ItemCAO::initialize(const std::string &data)
 	}
 	
 	updateNodePos();
+	
+	/*
+		Set infotext to item name if item cannot be deserialized
+	*/
+	try{
+		InventoryItem *item = NULL;
+		item = InventoryItem::deSerialize(m_inventorystring, m_gamedef);
+		if(item){
+			if(!item->isKnown())
+				m_infotext = "Unknown item: '" + m_inventorystring + "'";
+		}
+		delete item;
+	}
+	catch(SerializationError &e)
+	{
+		m_infotext = "Unknown item: '" + m_inventorystring + "'";
+	}
 }
 
 /*

src/craftitemdef.cpp

@@ -23,6 +23,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "log.h"
 #include <sstream>
 #include "utility.h"
+#include <map>
 
 CraftItemDefinition::CraftItemDefinition():
 	imagename(""),
@@ -84,8 +85,11 @@ class CCraftItemDefManager: public IWritableCraftItemDefManager
 	{
 		clear();
 	}
-	virtual const CraftItemDefinition* getCraftItemDefinition(const std::string &itemname) const
+	virtual const CraftItemDefinition* getCraftItemDefinition(const std::string &itemname_) const
 	{
+		// Convert name according to possible alias
+		std::string itemname = getAlias(itemname_);
+		// Get the definition
 		core::map<std::string, CraftItemDefinition*>::Node *n;
 		n = m_item_definitions.find(itemname);
 		if(n == NULL)
@@ -99,17 +103,25 @@ class CCraftItemDefManager: public IWritableCraftItemDefManager
 			return "";
 		return def->imagename;
 	}
+	virtual std::string getAlias(const std::string &name) const
+	{
+		std::map<std::string, std::string>::const_iterator i;
+		i = m_aliases.find(name);
+		if(i != m_aliases.end())
+			return i->second;
+		return name;
+	}
 	virtual bool registerCraftItem(std::string itemname, const CraftItemDefinition &def)
 	{
 		infostream<<"registerCraftItem: registering CraftItem \""<<itemname<<"\""<<std::endl;
-		/*core::map<std::string, CraftItemDefinition*>::Node *n;
-		n = m_item_definitions.find(itemname);
-		if(n != NULL){
-			errorstream<<"registerCraftItem: registering item \""<<toolname
-					<<"\" failed: name is already registered"<<std::endl;
-			return false;
-		}*/
 		m_item_definitions[itemname] = new CraftItemDefinition(def);
+
+		// Remove conflicting alias if it exists
+		bool alias_removed = (m_aliases.erase(itemname) != 0);
+		if(alias_removed)
+			infostream<<"cidef: erased alias "<<itemname
+					<<" because item was defined"<<std::endl;
+		
 		return true;
 	}
 	virtual void clear()
@@ -120,6 +132,19 @@ class CCraftItemDefManager: public IWritableCraftItemDefManager
 			delete i.getNode()->getValue();
 		}
 		m_item_definitions.clear();
+		m_aliases.clear();
+	}
+	virtual void setAlias(const std::string &name,
+			const std::string &convert_to)
+	{
+		if(getCraftItemDefinition(name) != NULL){
+			infostream<<"nidef: not setting alias "<<name<<" -> "<<convert_to
+					<<": "<<name<<" is already defined"<<std::endl;
+			return;
+		}
+		infostream<<"nidef: setting alias "<<name<<" -> "<<convert_to
+				<<std::endl;
+		m_aliases[name] = convert_to;
 	}
 	virtual void serialize(std::ostream &os)
 	{
@@ -138,6 +163,14 @@ class CCraftItemDefManager: public IWritableCraftItemDefManager
 			def->serialize(tmp_os);
 			os<<serializeString(tmp_os.str());
 		}
+
+		writeU16(os, m_aliases.size());
+		for(std::map<std::string, std::string>::const_iterator
+				i = m_aliases.begin(); i != m_aliases.end(); i++)
+		{
+			os<<serializeString(i->first);
+			os<<serializeString(i->second);
+		}
 	}
 	virtual void deSerialize(std::istream &is)
 	{
@@ -158,10 +191,21 @@ class CCraftItemDefManager: public IWritableCraftItemDefManager
 			// Register
 			registerCraftItem(name, def);
 		}
+
+		u16 num_aliases = readU16(is);
+		if(!is.eof()){
+			for(u16 i=0; i<num_aliases; i++){
+				std::string name = deSerializeString(is);
+				std::string convert_to = deSerializeString(is);
+				m_aliases[name] = convert_to;
+			}
+		}
 	}
 private:
 	// Key is name
 	core::map<std::string, CraftItemDefinition*> m_item_definitions;
+	// Aliases
+	std::map<std::string, std::string> m_aliases;
 };
 
 IWritableCraftItemDefManager* createCraftItemDefManager()

src/craftitemdef.h

@@ -49,6 +49,7 @@ class ICraftItemDefManager
 	virtual ~ICraftItemDefManager(){}
 	virtual const CraftItemDefinition* getCraftItemDefinition(const std::string &itemname) const=0;
 	virtual std::string getImagename(const std::string &itemname) const =0;
+	virtual std::string getAlias(const std::string &name) const =0;
 
 	virtual void serialize(std::ostream &os)=0;
 };
@@ -63,6 +64,11 @@ class IWritableCraftItemDefManager : public ICraftItemDefManager
 
 	virtual bool registerCraftItem(std::string itemname, const CraftItemDefinition &def)=0;
 	virtual void clear()=0;
+	// Set an alias so that entries named <name> will load as <convert_to>.
+	// Alias is not set if <name> has already been defined.
+	// Alias will be removed if <name> is defined at a later point of time.
+	virtual void setAlias(const std::string &name,
+			const std::string &convert_to)=0;
 
 	virtual void serialize(std::ostream &os)=0;
 	virtual void deSerialize(std::istream &is)=0;

src/environment.cpp

@@ -565,6 +565,7 @@ struct ActiveABM
 {
 	ActiveBlockModifier *abm;
 	int chance;
+	std::set<content_t> required_neighbors;
 };
 
 class ABMHandler
@@ -602,6 +603,18 @@ class ABMHandler
 			aabm.chance = 1.0 / pow((float)1.0/chance, (float)intervals);
 			if(aabm.chance == 0)
 				aabm.chance = 1;
+			// Trigger neighbors
+			std::set<std::string> required_neighbors_s
+					= abm->getRequiredNeighbors();
+			for(std::set<std::string>::iterator
+					i = required_neighbors_s.begin();
+					i != required_neighbors_s.end(); i++){
+				content_t c = ndef->getId(*i);
+				if(c == CONTENT_IGNORE)
+					continue;
+				aabm.required_neighbors.insert(c);
+			}
+			// Trigger contents
 			std::set<std::string> contents_s = abm->getTriggerContents();
 			for(std::set<std::string>::iterator
 					i = contents_s.begin(); i != contents_s.end(); i++){
@@ -646,6 +659,29 @@ class ABMHandler
 				if(myrand() % i->chance != 0)
 					continue;
 
+				// Check neighbors
+				if(!i->required_neighbors.empty())
+				{
+					v3s16 p1;
+					for(p1.X = p.X-1; p1.X <= p.X+1; p1.X++)
+					for(p1.Y = p.Y-1; p1.Y <= p.Y+1; p1.Y++)
+					for(p1.Z = p.Z-1; p1.Z <= p.Z+1; p1.Z++)
+					{
+						if(p1 == p)
+							continue;
+						MapNode n = map->getNodeNoEx(p1);
+						content_t c = n.getContent();
+						std::set<content_t>::const_iterator k;
+						k = i->required_neighbors.find(c);
+						if(k != i->required_neighbors.end()){
+							goto neighbor_found;
+						}
+					}
+					// No required neighbor found
+					continue;
+				}
+neighbor_found:
+
 				// Find out how many objects the block contains
 				u32 active_object_count = block->m_static_objects.m_active.size();
 				// Find out how many objects this and all the neighbors contain

src/environment.h

@@ -108,9 +108,15 @@ class ActiveBlockModifier
 	ActiveBlockModifier(){};
 	virtual ~ActiveBlockModifier(){};
 	
+	// Set of contents to trigger on
 	virtual std::set<std::string> getTriggerContents()=0;
+	// Set of required neighbors (trigger doesn't happen if none are found)
+	// Empty = do not check neighbors
+	virtual std::set<std::string> getRequiredNeighbors()
+	{ return std::set<std::string>(); }
+	// Trigger interval in seconds
 	virtual float getTriggerInterval() = 0;
-	// chance of (1 / return value), 0 is disallowed
+	// Random chance of (1 / return value), 0 is disallowed
 	virtual u32 getTriggerChance() = 0;
 	// This is called usually at interval for 1/chance of the nodes
 	virtual void trigger(ServerEnvironment *env, v3s16 p, MapNode n){};