Make many blocks drop when pushed by piston

mods/ITEMS/REDSTONE/mesecons/wires.lua

@@ -37,7 +37,7 @@ for zmy=0, 1 do
 	local longdesc
 	local usagehelp
 	if nodeid == "00000000" then
-		groups = {dig_immediate = 3, mesecon_conductor_craftable = 1, attached_node = 1, dig_by_water = 1}
+		groups = {dig_immediate = 3, mesecon_conductor_craftable = 1, attached_node = 1, dig_by_water = 1, dig_by_piston = 1}
 		wiredesc = "Redstone"
 		wirehelp = nodeid == "00000000"
 		if wirehelp then
@@ -49,7 +49,7 @@ Redstone power can be received from various redstone components, such as a block
 Read the help entries on the other redstone components to learn how redstone components interact.]]
 		end
 	else
-		groups = {dig_immediate = 3, not_in_creative_inventory = 1, attached_node = 1, dig_by_water = 1}
+		groups = {dig_immediate = 3, not_in_creative_inventory = 1, attached_node = 1, dig_by_water = 1, dig_by_piston = 1}
 		wiredesc = "Redstone Trail (ID: "..nodeid..")"
 		wirehelp = false
 	end
@@ -163,7 +163,7 @@ Read the help entries on the other redstone components to learn how redstone com
 			type = "fixed",
 			fixed = nodebox
 		},
-		groups = {dig_immediate = 3, mesecon = 2, dig_by_water = 1, attached_node = 1, not_in_creative_inventory = 1},
+		groups = {dig_immediate = 3, mesecon = 2, dig_by_water = 1, dig_by_piston = 1, attached_node = 1, not_in_creative_inventory = 1},
 		walkable = false,
 		stack_max = 64,
 		drop = "mesecons:wire_00000000_off",

mods/ITEMS/REDSTONE/mesecons_button/init.lua

@@ -57,7 +57,7 @@ minetest.register_node("mesecons_button:button_stone_off", {
 	walkable = false,
 	sunlight_propagates = true,
 	node_box = boxes_off,
-	groups = {handy=1,pickaxey=1, attached_node=1, dig_by_water=1},
+	groups = {handy=1,pickaxey=1, attached_node=1, dig_by_water=1, dig_by_piston=1},
 	description = "Stone Button",
 	_doc_items_longdesc = "A stone button is a redstone component made out of stone which can be pushed to provide redstone power. When pushed, it powers adjacent redstone components for 1 second.",
 	_doc_items_usagehelp = buttonuse,
@@ -88,7 +88,7 @@ minetest.register_node("mesecons_button:button_stone_on", {
 	walkable = false,
 	sunlight_propagates = true,
 	node_box = boxes_on,
-	groups = {handy=1,pickaxey=1, not_in_creative_inventory=1, attached_node=1, dig_by_water=1},
+	groups = {handy=1,pickaxey=1, not_in_creative_inventory=1, attached_node=1, dig_by_water=1, dig_by_piston=1},
 	drop = 'mesecons_button:button_stone_off',
 	description = "Stone Button",
 	_doc_items_create_entry = false,
@@ -113,7 +113,7 @@ minetest.register_node("mesecons_button:button_wood_off", {
 	walkable = false,
 	sunlight_propagates = true,
 	node_box = boxes_off,
-	groups = {handy=1,axey=1, attached_node=1, dig_by_water=1},
+	groups = {handy=1,axey=1, attached_node=1, dig_by_water=1, dig_by_piston=1},
 	description = "Wooden Button",
 	_doc_items_longdesc = "A wooden button is a redstone component made out of wood which can be pushed to provide redstone power. When pushed, it powers adjacent redstone components for 1.5 seconds.",
 	_doc_items_usagehelp = buttonuse,
@@ -144,7 +144,7 @@ minetest.register_node("mesecons_button:button_wood_on", {
 	walkable = false,
 	sunlight_propagates = true,
 	node_box = boxes_on,
-	groups = {handy=1,axey=1, not_in_creative_inventory=1, attached_node=1, dig_by_water=1},
+	groups = {handy=1,axey=1, not_in_creative_inventory=1, attached_node=1, dig_by_water=1, dig_by_piston=1},
 	drop = 'mesecons_button:button_wood_off',
 	description = "Wooden Button",
 	_doc_items_create_entry = false,

mods/ITEMS/REDSTONE/mesecons_delayer/init.lua

@@ -46,9 +46,9 @@ end
 for i = 1, 4 do
 local groups = {}
 if i == 1 then 
-	groups = {dig_immediate=3,dig_by_water=1,attached_node=1}
+	groups = {dig_immediate=3,dig_by_water=1,dig_by_piston=1,attached_node=1}
 else
-	groups = {dig_immediate=3,dig_by_water=1,attached_node=1, not_in_creative_inventory=1}
+	groups = {dig_immediate=3,dig_by_water=1,dig_by_piston=1,attached_node=1, not_in_creative_inventory=1}
 end
 
 local delaytime
@@ -185,7 +185,7 @@ minetest.register_node("mesecons_delayer:delayer_on_"..tostring(i), {
 		type = "fixed",
 		fixed = boxes
 	},
-	groups = {dig_immediate = 3, dig_by_water=1, attached_node=1, not_in_creative_inventory = 1},
+	groups = {dig_immediate = 3, dig_by_water=1, dig_by_piston=1, attached_node=1, not_in_creative_inventory = 1},
 	paramtype = "light",
 	paramtype2 = "facedir",
 	sunlight_propagates = false,

mods/ITEMS/REDSTONE/mesecons_mvps/init.lua

@@ -24,6 +24,9 @@ function mesecon:is_mvps_dropper(node, pushdir, stack, stackid)
 	if type (get_dropper) == "function" then
 		get_dropper = get_dropper(node, pushdir, stack, stackid)
 	end
+	if not get_dropper then
+		get_dropper = minetest.get_item_group(node.name, "dig_by_piston") == 1
+	end
 	return get_dropper
 end
 
@@ -78,7 +81,6 @@ function mesecon:mvps_push(pos, dir, maximum) -- pos: pos of mvps; dir: directio
 		n.meta = minetest.get_meta(n.pos):to_table()
 		local is_dropper = mesecon:is_mvps_dropper(n.node, dir, nodes, id)
 		if is_dropper then
-			minetest.log("error", "DROPPER @ "..minetest.pos_to_string(n.pos))
 			local drops = minetest.get_node_drops(n.node.name, "")
 			local droppos = vector.add(n.pos, dir)
 			minetest.handle_node_drops(droppos, drops, nil)
@@ -193,10 +195,3 @@ mesecon:register_mvps_stopper("mesecons_solarpanel:solar_panel_on")
 mesecon:register_mvps_stopper("mesecons_solarpanel:solar_panel_inverted_off")
 mesecon:register_mvps_stopper("mesecons_solarpanel:solar_panel_inverted_on")
 mesecon:register_mvps_stopper("mesecons_noteblock:noteblock")
-
-mesecon:register_mvps_dropper("mcl_core:cactus")
-mesecon:register_mvps_dropper("mcl_core:cobweb")
-mesecon:register_mvps_dropper("mcl_farming:melon")
-mesecon:register_mvps_dropper("mcl_farming:pumpkin")
-mesecon:register_mvps_dropper("beds:bed_top")
-mesecon:register_mvps_dropper("beds:bed_bottom")

mods/ITEMS/REDSTONE/mesecons_pressureplates/init.lua

@@ -59,6 +59,7 @@ function mesecon:register_pressure_plate(offstate, onstate, description, texture
 
 	local groups_off = table.copy(plusgroups)
 	groups_off.attached_node = 1
+	groups_off.dig_by_piston = 1
 
 	minetest.register_node(offstate, {
 		drawtype = "nodebox",

mods/ITEMS/beds/api.lua

@@ -49,7 +49,7 @@ function beds.register_bed(name, def)
 		paramtype2 = "facedir",
 		is_ground_content = false,
 		stack_max = 1,
-		groups = {handy=1, flammable = 3, bed = 1},
+		groups = {handy=1, flammable = 3, bed = 1, dig_by_piston=1},
 		_mcl_hardness = 0.2,
 		_mcl_blast_resistance = 1,
 		sounds = def.sounds or mcl_sounds.node_sound_wood_defaults(),
@@ -165,7 +165,7 @@ function beds.register_bed(name, def)
 		sunlight_propagates = true,
 		is_ground_content = false,
 		pointable = false,
-		groups = {handy = 1, flammable = 3, bed = 2},
+		groups = {handy = 1, flammable = 3, bed = 2, dig_by_piston=1},
 		_mcl_hardness = 0.2,
 		_mcl_blast_resistance = 1,
 		sounds = def.sounds or mcl_sounds.node_sound_wood_defaults(),

mods/ITEMS/gemalde/init.lua

@@ -16,9 +16,9 @@ N = N - 1
 -- register for each picture
 for n=1, N do
 
-local groups = {dig_immediate=3, picture=1, not_in_creative_inventory=1}
+local groups = {dig_immediate=3, picture=1, not_in_creative_inventory=1, dig_by_piston=1}
 if n == 1 then
-	groups = {dig_immediate=3, picture=1, deco_block=1}
+	groups = {dig_immediate=3, picture=1, deco_block=1, dig_by_piston=1}
 end
 
 local desc, doc, longdesc, usagehelp

mods/ITEMS/itemframes/init.lua

@@ -100,7 +100,7 @@ minetest.register_node("itemframes:frame",{
 	paramtype = "light",
 	paramtype2 = "facedir",
 	sunlight_propagates = true,
-	groups = { dig_immediate=3,deco_block=1},
+	groups = { dig_immediate=3,deco_block=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_defaults(),
 	after_place_node = function(pos, placer, itemstack)
 		local meta = minetest.get_meta(pos)

mods/ITEMS/mcl_cake/init.lua

@@ -46,7 +46,7 @@ minetest.register_node("mcl_cake:cake", {
 		fixed = full_cake
 	},
 	stack_max = 1,
-	groups = {handy=1, food=2,attached_node=1},
+	groups = {handy=1, food=2,attached_node=1, dig_by_piston=1},
 	drop = '',
 	on_rightclick = function(pos, node, clicker, itemstack)
 		minetest.do_item_eat(2, ItemStack("mcl_cake:cake_6"), ItemStack("mcl_cake:cake"), clicker, {type="nothing"})
@@ -90,7 +90,7 @@ local register_slice = function(level, nodebox, desc)
 			type = "fixed",
 			fixed = nodebox,
 			},
-		groups = {handy=1, food=2,attached_node=1,not_in_creative_inventory=1},
+		groups = {handy=1, food=2,attached_node=1,not_in_creative_inventory=1,dig_by_piston=1},
 		drop = '',
 		on_rightclick = on_rightclick,
 		sounds = mcl_sounds.node_sound_leaves_defaults(),

mods/ITEMS/mcl_chests/init.lua

@@ -504,7 +504,7 @@ for color, desc in pairs(boxtypes) do
 		tiles = {"mcl_chests_"..color.."_shulker_box_top.png", "mcl_chests_"..color.."_shulker_box_bottom.png",
 			"mcl_chests_"..color.."_shulker_box_side.png", "mcl_chests_"..color.."_shulker_box_side.png",
 			"mcl_chests_"..color.."_shulker_box_side.png", "mcl_chests_"..color.."_shulker_box_side.png"},
-		groups = {handy=1,pickaxey=1, container=3, deco_block=1, shulker_box=1},
+		groups = {handy=1,pickaxey=1, container=3, deco_block=1, dig_by_piston=1, shulker_box=1},
 		is_ground_content = false,
 		sounds = mcl_sounds.node_sound_stone_defaults(),
 		stack_max = 1,

mods/ITEMS/mcl_cocoas/init.lua

@@ -110,7 +110,7 @@ local crop_def = {
 		},
 	},
 	groups = {
-		handy=1,axey=1, cocoa=1, not_in_creative_inventory=1, dig_by_water=1,
+		handy=1,axey=1, cocoa=1, not_in_creative_inventory=1, dig_by_water=1, dig_by_piston=1
 	},
 	sounds = mcl_sounds.node_sound_wood_defaults(),
 	_mcl_blast_resistance = 15,

mods/ITEMS/mcl_core/nodes.lua

@@ -674,7 +674,7 @@ minetest.register_node("mcl_core:leaves", {
 	tiles = {"default_leaves.png"},
 	paramtype = "light",
 	stack_max = 64,
-	groups = {handy=1,shearsy=1,swordy=1, leafdecay=4, flammable=2, leaves=1, deco_block=1},
+	groups = {handy=1,shearsy=1,swordy=1, leafdecay=4, flammable=2, leaves=1, deco_block=1, dig_by_piston=1},
 	drop = {
 		max_items = 1,
 		items = {
@@ -757,7 +757,7 @@ minetest.register_node("mcl_core:darkleaves", {
 	tiles = {"default_leaves_big_oak.png"},
 	paramtype = "light",
 	stack_max = 64,
-	groups = {handy=1,shearsy=1,swordy=1, leafdecay=4, flammable=2, leaves=1, deco_block=1},
+	groups = {handy=1,shearsy=1,swordy=1, leafdecay=4, flammable=2, leaves=1, deco_block=1, dig_by_piston=1},
 	drop = {
 		max_items = 1,
 		items = {
@@ -848,7 +848,7 @@ minetest.register_node("mcl_core:jungleleaves", {
 	tiles = {"default_jungleleaves.png"},
 	paramtype = "light",
 	stack_max = 64,
-	groups = {handy=1,shearsy=1,swordy=1, leafdecay=4, flammable=2, leaves=1, deco_block=1},
+	groups = {handy=1,shearsy=1,swordy=1, leafdecay=4, flammable=2, leaves=1, deco_block=1, dig_by_piston=1},
 	drop = {
 		max_items = 1,
 		items = {
@@ -927,7 +927,7 @@ minetest.register_node("mcl_core:acacialeaves", {
 	tiles = {"default_acacialeaves.png"},
 	paramtype = "light",
 	stack_max = 64,
-	groups = {handy=1,shearsy=1,swordy=1, leafdecay=4, flammable=2, leaves=1, deco_block=1},
+	groups = {handy=1,shearsy=1,swordy=1, leafdecay=4, flammable=2, leaves=1, deco_block=1, dig_by_piston=1},
 	drop = {
 		max_items = 1,
 		items = {
@@ -1004,7 +1004,7 @@ minetest.register_node("mcl_core:spruceleaves", {
 	tiles = {"default_spruceleaves.png"},
 	paramtype = "light",
 	stack_max = 64,
-	groups = {handy=1,shearsy=1,swordy=1, leafdecay=4, flammable=2, leaves=1, deco_block=1},
+	groups = {handy=1,shearsy=1,swordy=1, leafdecay=4, flammable=2, leaves=1, deco_block=1, dig_by_piston=1},
 	drop = {
 		max_items = 1,
 		items = {
@@ -1087,7 +1087,7 @@ minetest.register_node("mcl_core:birchleaves", {
 	tiles = {"default_leaves_birch.png"},
 	paramtype = "light",
 	stack_max = 64,
-	groups = {handy=1,shearsy=1,swordy=1, leafdecay=4, flammable=2, leaves=1, deco_block=1},
+	groups = {handy=1,shearsy=1,swordy=1, leafdecay=4, flammable=2, leaves=1, deco_block=1, dig_by_piston=1},
 	drop = {
 		max_items = 1,
 		items = {
@@ -1137,7 +1137,7 @@ minetest.register_node("mcl_core:cactus", {
 	tiles = {"default_cactus_top.png", "default_cactus_bottom.png", "default_cactus_side.png","default_cactus_side.png","default_cactus_side.png","default_cactus_side.png"},
 	is_ground_content = true,
 	stack_max = 64,
-	groups = {handy=1, attached_node=1, deco_block=1},
+	groups = {handy=1, attached_node=1, deco_block=1, dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_wood_defaults(),
 	paramtype = "light",
 	node_placement_prediction = "",
@@ -1218,7 +1218,7 @@ minetest.register_node("mcl_core:reeds", {
 		},
 	},
 	stack_max = 64,
-	groups = {dig_immediate=3, craftitem=1},
+	groups = {dig_immediate=3, craftitem=1, dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 	_mcl_hardness = 0,
@@ -1320,7 +1320,7 @@ minetest.register_node("mcl_core:ladder", {
 		wall_side = { -0.5, -0.5, -0.5, -7/16, 0.5, 0.5 },
 	},
 	stack_max = 64,
-	groups = {handy=1,axey=1, attached_node=1, deco_block=1},
+	groups = {handy=1,axey=1, attached_node=1, deco_block=1, dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_wood_defaults(),
 	node_placement_prediction = "",
 	-- Restrict placement of ladders
@@ -1387,7 +1387,7 @@ minetest.register_node("mcl_core:vine", {
 		type = "wallmounted",
 	},
 	stack_max = 64,
-	groups = {handy=1,axey=1,shearsy=1,swordy=1, flammable=2,deco_block=1},
+	groups = {handy=1,axey=1,shearsy=1,swordy=1, flammable=2,deco_block=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	drop = "",
 	after_dig_node = function(pos, oldnode, oldmetadata, user)
@@ -1479,7 +1479,7 @@ minetest.register_node("mcl_core:water_flowing", {
 	liquid_range = 7,
 	freezemelt = "mcl_core:snow",
 	post_effect_color = {a=64, r=100, g=100, b=200},
-	groups = { water=3, liquid=3, puts_out_fire=1, not_in_creative_inventory=1, freezes=1, melt_around=1},
+	groups = { water=3, liquid=3, puts_out_fire=1, not_in_creative_inventory=1, freezes=1, melt_around=1, dig_by_piston=1},
 	_mcl_blast_resistance = 500,
 	-- Hardness intentionally set to infinite instead of 100 (Minecraft value) to avoid problems in creative mode
 	_mcl_hardness = -1,
@@ -1519,7 +1519,7 @@ minetest.register_node("mcl_core:water_source", {
 	freezemelt = "mcl_core:ice",
 	post_effect_color = {a=64, r=100, g=100, b=200},
 	stack_max = 64,
-	groups = { water=3, liquid=3, puts_out_fire=1, freezes=1, not_in_creative_inventory=1},
+	groups = { water=3, liquid=3, puts_out_fire=1, freezes=1, not_in_creative_inventory=1, dig_by_piston=1},
 	_mcl_blast_resistance = 500,
 	-- Hardness intentionally set to infinite instead of 100 (Minecraft value) to avoid problems in creative mode
 	_mcl_hardness = -1,
@@ -1564,7 +1564,7 @@ minetest.register_node("mcl_core:lava_flowing", {
 	liquid_range = 4,
 	damage_per_second = 4*2,
 	post_effect_color = {a=192, r=255, g=64, b=0},
-	groups = { lava=3, liquid=2, igniter=3, destroys_items=1, not_in_creative_inventory=1},
+	groups = { lava=3, liquid=2, igniter=3, destroys_items=1, not_in_creative_inventory=1, dig_by_piston=1},
 	_mcl_blast_resistance = 500,
 	-- Hardness intentionally set to infinite instead of 100 (Minecraft value) to avoid problems in creative mode
 	_mcl_hardness = -1,
@@ -1605,7 +1605,7 @@ minetest.register_node("mcl_core:lava_source", {
 	damage_per_second = 4*2,
 	post_effect_color = {a=192, r=255, g=64, b=0},
 	stack_max = 64,
-	groups = { lava=3, liquid=2, igniter=3, destroys_items=1, not_in_creative_inventory=1},
+	groups = { lava=3, liquid=2, igniter=3, destroys_items=1, not_in_creative_inventory=1, dig_by_piston=1},
 	_mcl_blast_resistance = 500,
 	-- Hardness intentionally set to infinite instead of 100 (Minecraft value) to avoid problems in creative mode
 	_mcl_hardness = -1,
@@ -1876,7 +1876,7 @@ minetest.register_node("mcl_core:snow", {
 			{-0.5, -0.5, -0.5,  0.5, -0.5+2/16, 0.5},
 		},
 	},
-	groups = {shovely=1, attached_node=1,deco_block=1},
+	groups = {shovely=1, attached_node=1,deco_block=1, dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_snow_defaults(),
 	drop = "mcl_throwing:snowball 2",
 	_mcl_blast_resistance = 0.5,
@@ -1915,7 +1915,7 @@ minetest.register_node("mcl_core:cobweb", {
 	liquid_renewable = false,
 	liquid_range = 0,
 	walkable = false,
-	groups = {swordy_cobweb=1,shearsy=1, deco_block=1},
+	groups = {swordy_cobweb=1,shearsy=1, deco_block=1, dig_by_piston=1},
 	drop = "mcl_mobitems:string",
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 20,

mods/ITEMS/mcl_doors/init.lua

@@ -21,6 +21,7 @@ mcl_doors = {}
 
 function mcl_doors:register_door(name, def)
 	def.groups.not_in_creative_inventory = 1
+	def.groups.dig_by_piston = 1
 
 	if not def.sound_open then
 		def.sound_open = "doors_door_open"

mods/ITEMS/mcl_end/init.lua

@@ -155,7 +155,7 @@ minetest.register_node("mcl_end:dragon_egg", {
 	selection_box = {
 		type = "regular",
 	},
-	groups = {handy=1, falling_node = 1, deco_block = 1, not_in_creative_inventory = 1, },
+	groups = {handy=1, falling_node = 1, deco_block = 1, not_in_creative_inventory = 1, dig_by_piston = 1 },
 	sounds = mcl_sounds.node_sound_stone_defaults(),
 	_mcl_blast_resistance = 45,
 	_mcl_hardness = 3,
@@ -188,7 +188,7 @@ minetest.register_node("mcl_end:chorus_flower", {
 	node_box = chorus_flower_box,
 	selection_box = { type = "regular" },
 	sounds = mcl_sounds.node_sound_wood_defaults(),
-	groups = {handy=1,axey=1, deco_block = 1, },
+	groups = {handy=1,axey=1, deco_block = 1, dig_by_piston = 1},
 	_mcl_blast_resistance = 2,
 	_mcl_hardness = 0.4,
 })
@@ -209,7 +209,7 @@ minetest.register_node("mcl_end:chorus_flower_dead", {
 	selection_box = { type = "regular" },
 	sounds = mcl_sounds.node_sound_wood_defaults(),
 	drop = "mcl_end:chorus_flower",
-	groups = {handy=1,axey=1, deco_block = 1, },
+	groups = {handy=1,axey=1, deco_block = 1, dig_by_piston = 1},
 	_mcl_blast_resistance = 2,
 	_mcl_hardness = 0.4,
 })
@@ -242,7 +242,7 @@ minetest.register_node("mcl_end:chorus_plant", {
 	sounds = mcl_sounds.node_sound_wood_defaults(),
 	-- TODO: Check drop probability
 	drop = { items = { {items = { "mcl_end:chorus_fruit", rarity = 4 } } } },
-	groups = {handy=1,axey=1, not_in_creative_inventory = 1, },
+	groups = {handy=1,axey=1, not_in_creative_inventory = 1, dig_by_piston = 1 },
 	_mcl_blast_resistance = 2,
 	_mcl_hardness = 0.4,
 })

mods/ITEMS/mcl_farming/beetroot.lua

@@ -28,7 +28,7 @@ minetest.register_node("mcl_farming:beetroot_0", {
 			{-0.5, -0.5, -0.5, 0.5, -0.125, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })
@@ -50,7 +50,7 @@ minetest.register_node("mcl_farming:beetroot_1", {
 			{-0.5, -0.5, -0.5, 0.5, -0.125, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })
@@ -72,7 +72,7 @@ minetest.register_node("mcl_farming:beetroot_2", {
 			{-0.5, -0.5, -0.5, 0.5, -0.125, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })
@@ -103,7 +103,7 @@ minetest.register_node("mcl_farming:beetroot", {
 			{-0.5, -0.5, -0.5, 0.5, -0.125, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })

mods/ITEMS/mcl_farming/carrots.lua

@@ -16,7 +16,7 @@ minetest.register_node("mcl_farming:carrot_1", {
 			{-0.5, -0.5, -0.5, 0.5, -0.125, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })
@@ -38,7 +38,7 @@ minetest.register_node("mcl_farming:carrot_2", {
 			{-0.5, -0.5, -0.5, 0.5, -0.125, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })
@@ -60,7 +60,7 @@ minetest.register_node("mcl_farming:carrot_3", {
 			{-0.5, -0.5, -0.5, 0.5, -0.125, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })
@@ -84,7 +84,7 @@ minetest.register_node("mcl_farming:carrot", {
 			{ items = {'mcl_farming:carrot_item 1'} },
 		}
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })

mods/ITEMS/mcl_farming/melon.lua

@@ -18,7 +18,7 @@ local melon_base_def = {
 	_doc_items_longdesc = "A melon is a block which can be grown from melon stems, which in turn are grown from melon seeds. It can be harvested for melon slices.",
 	stack_max = 64,
 	tiles = {"farming_melon_top.png", "farming_melon_top.png", "farming_melon_side.png", "farming_melon_side.png", "farming_melon_side.png", "farming_melon_side.png"},
-	groups = {handy=1,axey=1, building_block=1},
+	groups = {handy=1,axey=1, building_block=1,dig_by_piston=1},
 	drop = {
 		max_items = 1,
 		items = {

mods/ITEMS/mcl_farming/potatoes.lua

@@ -16,7 +16,7 @@ minetest.register_node("mcl_farming:potato_1", {
 			{-0.5, -0.5, -0.5, 0.5, -0.125, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })
@@ -38,7 +38,7 @@ minetest.register_node("mcl_farming:potato_2", {
 			{-0.5, -0.5, -0.5, 0.5, -0.125, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })
@@ -62,7 +62,7 @@ minetest.register_node("mcl_farming:potato", {
 			{ items = {'mcl_farming:potato_item_poison 1'}, rarity = 50 }
 		}
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })

mods/ITEMS/mcl_farming/pumpkin.lua

@@ -79,7 +79,7 @@ local pumpkin_base_def = {
 	stack_max = 64,
 	paramtype2 = "facedir",
 	tiles = {"farming_pumpkin_top.png", "farming_pumpkin_top.png", "farming_pumpkin_side.png", "farming_pumpkin_side.png", "farming_pumpkin_side.png", "farming_pumpkin_face.png"},
-	groups = {handy=1,axey=1, building_block=1},
+	groups = {handy=1,axey=1, building_block=1, dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_wood_defaults(),
 	_mcl_blast_resistance = 5,
 	_mcl_hardness = 1,
@@ -103,7 +103,7 @@ minetest.register_node("mcl_farming:pumpkin_face_light", {
 	-- Real light level: 15 (Minetest caps at 14)
 	light_source = 14,
 	tiles = {"farming_pumpkin_top.png", "farming_pumpkin_top.png", "farming_pumpkin_side.png", "farming_pumpkin_side.png", "farming_pumpkin_side.png", "farming_pumpkin_face_light.png"},
-	groups = {handy=1,axey=1, building_block=1},
+	groups = {handy=1,axey=1, building_block=1, dig_by_piston=1 },
 	sounds = mcl_sounds.node_sound_wood_defaults(),
 	_mcl_blast_resistance = 5,
 	_mcl_hardness = 1,

mods/ITEMS/mcl_farming/wheat.lua

@@ -30,7 +30,7 @@ minetest.register_node("mcl_farming:wheat_1", {
 			{-0.5, -0.5, -0.5, 0.5, -0.125, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1, dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1, dig_by_water=1, dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })
@@ -54,7 +54,7 @@ minetest.register_node("mcl_farming:wheat_2", {
 			{-0.5, -0.5, -0.5, 0.5, -0.25, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1, dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1, dig_by_water=1, dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })
@@ -78,7 +78,7 @@ minetest.register_node("mcl_farming:wheat_3", {
 			{-0.5, -0.5, -0.5, 0.5, 0.25, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1, dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1, dig_by_water=1, dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })
@@ -110,7 +110,7 @@ minetest.register_node("mcl_farming:wheat", {
 			{-0.5, -0.5, -0.5, 0.5, 0.35, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1, dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1, dig_by_water=1, dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 0,
 })

mods/ITEMS/mcl_fire/init.lua

@@ -35,7 +35,7 @@ minetest.register_node("mcl_fire:fire", {
 	buildable_to = true,
 	sunlight_propagates = true,
 	damage_per_second = 1,
-	groups = {igniter = 1, dig_immediate = 3, not_in_creative_inventory = 1},
+	groups = {igniter = 1, dig_immediate = 3, not_in_creative_inventory = 1, dig_by_piston=1},
 	on_timer = function(pos)
 		local f = minetest.find_node_near(pos, 1, {"group:flammable"})
 		if not f then
@@ -76,7 +76,7 @@ minetest.register_node("mcl_fire:eternal_fire", {
 	buildable_to = true,
 	sunlight_propagates = true,
 	damage_per_second = 1,
-	groups = {igniter = 1, dig_immediate = 3, not_in_creative_inventory = 1},
+	groups = {igniter = 1, dig_immediate = 3, not_in_creative_inventory = 1, dig_by_piston = 1},
 	sounds = {},
 	drop = "",
 	_mcl_blast_resistance = 0,

mods/ITEMS/mcl_flowerpots/nodes.lua

@@ -49,7 +49,7 @@ minetest.register_node("mcl_flowerpots:flower_pot", {
 	},
 	is_ground_content = false,
 	inventory_image = "mcl_flowerpots_flowerpot_inventory.png",
-	groups = {dig_immediate=3, deco_block=1, attached_node=1, flower_pot=1},
+	groups = {dig_immediate=3, deco_block=1, attached_node=1, dig_by_piston=1, flower_pot=1},
 	sounds = mcl_sounds.node_sound_stone_defaults(),
 	on_rightclick = function(pos, node, clicker, itemstack)
 		local item = clicker:get_wielded_item():get_name()
@@ -110,7 +110,7 @@ minetest.register_node("mcl_flowerpots:flower_pot_"..flower, {
 		fixed = {-0.2, -0.5, -0.2, 0.2, -0.1, 0.2}
 	},
 	is_ground_content = false,
-	groups = {dig_immediate=3, attached_node=1, not_in_creative_inventory=1, flower_pot=2},
+	groups = {dig_immediate=3, attached_node=1, dig_by_piston=1, not_in_creative_inventory=1, flower_pot=2},
 	sounds = mcl_sounds.node_sound_stone_defaults(),
 	on_rightclick = function(pos, item, clicker)
 		minetest.add_item({x=pos.x, y=pos.y+0.5, z=pos.z}, flower_node)
@@ -152,7 +152,7 @@ minetest.register_node("mcl_flowerpots:flower_pot_"..flower, {
 		fixed = {-0.2, -0.5, -0.2, 0.2, -0.1, 0.2}
 	},
 	is_ground_content = false,
-	groups = {dig_immediate=3, attached_node=1, not_in_creative_inventory=1, flower_pot=2},
+	groups = {dig_immediate=3, attached_node=1, dig_by_piston=1, not_in_creative_inventory=1, flower_pot=2},
 	sounds = mcl_sounds.node_sound_stone_defaults(),
 	on_rightclick = function(pos, item, clicker)
 		minetest.add_item({x=pos.x, y=pos.y+0.5, z=pos.z}, flower_node)

mods/ITEMS/mcl_flowers/init.lua

@@ -18,7 +18,7 @@ local function add_simple_flower(name, desc, image, simple_selection_box)
 		paramtype = "light",
 		walkable = false,
 		stack_max = 64,
-		groups = {dig_immediate=3,flammable=2,flower=1,attached_node=1,dig_by_water=1,deco_block=1},
+		groups = {dig_immediate=3,flammable=2,flower=1,attached_node=1,dig_by_water=1,dig_by_piston=1,deco_block=1},
 		sounds = mcl_sounds.node_sound_leaves_defaults(),
 		buildable_to = true,
 		selection_box = {
@@ -66,6 +66,7 @@ minetest.register_node("mcl_flowers:tallgrass", {
 	walkable = false,
 	buildable_to = true,
 	is_ground_content = true,
+	-- CHECKME: How does tall grass behave when pushed by a piston?
 	groups = {dig_immediate=3, flammable=3,attached_node=1,dig_by_water=1,deco_block=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	drop = wheat_seed_drop,
@@ -91,6 +92,7 @@ minetest.register_node("mcl_flowers:fern", {
 	paramtype = "light",
 	walkable = false,
 	stack_max = 64,
+	-- CHECKME: How does a fern behave when pushed by a piston?
 	groups = {dig_immediate=3,flammable=2,attached_node=1,dig_by_water=1,deco_block=1},
 	buildable_to = true,
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
@@ -159,7 +161,7 @@ local function add_large_plant(name, desc, longdesc, bottom_img, top_img, inv_im
 				minetest.remove_node(top)
 			end
 		end,
-		groups = {dig_immediate=3,flammable=2,flower=1,attached_node=1, dig_by_water=1, double_plant=1,deco_block=1},
+		groups = {dig_immediate=3,flammable=2,flower=1,attached_node=1, dig_by_water=1,dig_by_piston=1, double_plant=1,deco_block=1},
 		sounds = mcl_sounds.node_sound_leaves_defaults(),
 	})
 
@@ -181,7 +183,7 @@ local function add_large_plant(name, desc, longdesc, bottom_img, top_img, inv_im
 				minetest.dig_node(bottom)
 			end
 		end,
-		groups = {dig_immediate=3,flammable=2,flower=1, dig_by_water=1, not_in_creative_inventory = 1, double_plant=2},
+		groups = {dig_immediate=3,flammable=2,flower=1, dig_by_water=1,dig_by_piston=1, not_in_creative_inventory = 1, double_plant=2},
 		sounds = mcl_sounds.node_sound_leaves_defaults(),
 	})
 
@@ -214,7 +216,7 @@ minetest.register_node("mcl_flowers:waterlily", {
 	liquids_pointable = true,
 	walkable = true,
 	sunlight_propagates = true,
-	groups = {dig_immediate = 3, dig_by_water = 1, deco_block=1},
+	groups = {dig_immediate = 3, dig_by_water = 1, dig_by_piston = 1, deco_block=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	node_placement_prediction = "",
 	node_box = {

mods/ITEMS/mcl_heads/init.lua

@@ -12,7 +12,7 @@ local function addhead(node, desc, longdesc)
 				{ -0.25, -0.5, -0.25, 0.25, 0.0, 0.25, },   			
 			},
 		},
-		groups = {handy=1, head=1, deco_block=1},
+		groups = {handy=1, head=1, deco_block=1, dig_by_piston=1},
 		tiles = {
 			"head_"..node.."_top.png",
 			"head_"..node.."_top.png",

mods/ITEMS/mcl_mushrooms/small.lua

@@ -7,7 +7,7 @@ minetest.register_node("mcl_mushrooms:mushroom_brown", {
 	sunlight_propagates = true,
 	paramtype = "light",
 	walkable = false,
-	groups = {dig_immediate=3,mushroom=1,attached_node=1,dig_by_water=1,deco_block=1},
+	groups = {dig_immediate=3,mushroom=1,attached_node=1,dig_by_water=1,dig_by_piston=1,deco_block=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	light_source = 1,
 	selection_box = {
@@ -26,7 +26,7 @@ minetest.register_node("mcl_mushrooms:mushroom_red", {
 	sunlight_propagates = true,
 	paramtype = "light",
 	walkable = false,
-	groups = {dig_immediate=3,mushroom=1,attached_node=1,dig_by_water=1,deco_block=1},
+	groups = {dig_immediate=3,mushroom=1,attached_node=1,dig_by_water=1,dig_by_piston=1,deco_block=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	selection_box = {
 		type = "fixed",

mods/ITEMS/mcl_nether/nether_wart.lua

@@ -14,7 +14,7 @@ minetest.register_node("mcl_nether:nether_wart_0", {
 			{-0.5, -0.5, -0.5, 0.5, -0.125, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,attached_node=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,attached_node=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 })
 
@@ -34,7 +34,7 @@ minetest.register_node("mcl_nether:nether_wart_1", {
 			{-0.5, -0.5, -0.5, 0.5, 0.15, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,attached_node=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,attached_node=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 })
 
@@ -54,7 +54,7 @@ minetest.register_node("mcl_nether:nether_wart_2", {
 			{-0.5, -0.5, -0.5, 0.5, 0.15, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,attached_node=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,attached_node=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 })
 
@@ -81,7 +81,7 @@ minetest.register_node("mcl_nether:nether_wart", {
 			{-0.5, -0.5, -0.5, 0.5, 0.45, 0.5}
 		},
 	},
-	groups = {dig_immediate=3, not_in_creative_inventory=1,attached_node=1,dig_by_water=1},
+	groups = {dig_immediate=3, not_in_creative_inventory=1,attached_node=1,dig_by_water=1,dig_by_piston=1},
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 })
 

mods/ITEMS/mcl_torches/init.lua

@@ -17,6 +17,7 @@ mcl_torches.register_torch = function(substring, description, doc_items_longdesc
 	groups.attached_node = 1
 	groups.torch = 1
 	groups.dig_by_water = 1
+	groups.dig_by_piston = 1
 
 	local floordef = {
 		description = description,