first commit

depends.txt

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+default

init.lua

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+minetest.register_node("tunnels:stone", {
+	description = "Tunnels Stone",
+	tiles = {"default_stone.png^[colorize:green:120"},
+	is_ground_content = true,
+	groups = {cracky=3, stone=1, vein=1},
+	drop = 'tunnels:stone',
+	legacy_mineral = true,
+	sounds = default.node_sound_stone_defaults(),
+})
+
+minetest.register_node("tunnels:stone_inactivated", {
+	description = "Tunnels Stone",
+	tiles = {"default_stone.png^[colorize:red:120"},
+	is_ground_content = true,
+	groups = {cracky=3, stone=1, vein=1},
+	drop = 'tunnels:stone',
+	legacy_mineral = true,
+	sounds = default.node_sound_stone_defaults(),
+})
+
+-- Checks if a given position is already occupied
+local function is_pos_occupied(pos)
+	local name = minetest.get_node(pos).name
+	if name == "air" then
+		return false
+	else
+		return true
+	end
+end
+
+-- Returns a random neighbour pos
+local function get_neighbour(pos, prefer_horizontal)
+
+	-- Generate three random integers from -1 to 1 that represent possible
+	-- neighbour's coordinates projections
+	local delta_x = math.random(3) - 2
+	local delta_y
+	local delta_z = math.random(3) - 2
+
+	if prefer_horizontal then
+		if math.random(4) == 1 then
+			delta_y = math.random(3) - 2
+		else
+			delta_y = 0
+		end
+	else
+		delta_y = math.random(3) - 2
+	end
+
+	-- Finally, calculate the position
+	local neighbour = {
+		x = pos.x + delta_x,
+		y = pos.y + delta_y,
+		z = pos.z + delta_z}
+
+	-- Return the result
+	return neighbour
+end
+
+minetest.register_abm({
+	nodenames = {"tunnels:stone"},
+	interval = 1,
+	chance = 1,
+	action = function(pos, node, active_object_count, active_object_count_wider)
+
+		local neighbour = get_neighbour(pos, true)
+		if not is_pos_occupied(neighbour) then
+			minetest.set_node(neighbour, node)
+		end
+
+		-- Inactivate the stem node (there is a 25% chance that it won't be inactivated)
+		if math.random(3) ~= 1 then
+			minetest.set_node(pos, {name = "tunnels:stone_inactivated"})
+			local meta = minetest.get_meta(pos)
+			meta:set_string("infotext", "Hello infotext!")
+		end
+	end,
+})