-- Modify a node to add a group
function minetest.add_group(node, groups)
	local def = minetest.registered_items[node]
	if not def then
		return false
	end
	local def_groups = def.groups or {}
	for group, value in pairs(groups) do
		if value ~= 0 then
			def_groups[group] = value
		else
			def_groups[group] = nil
		end
	end
	minetest.override_item(node, {groups = def_groups})
	return true
end

-- Check if the table contains an element.
function table.contains(table, element)
  for key, value in pairs(table) do
    if value == element then
			if key then
				return key
			else
				return true
			end
    end
  end
  return false
end

-- This isn't already in the math library? Really?
function math.round(i)
	return math.floor(i + 0.5)
end

-- Push an element onto a stack (table).
function push(t, x)
	t[#t+1] = x
end

function lib_ecology.clone_node(name)
	local node = minetest.registered_nodes[name]
	local node2 = table.copy(node)
	return node2
end





--NOTES
--[[
Code below taken from Valleys_c deco.lua, and deco_trees.lua
Sections are delineated due to execution timing.
--]]

--[[
-- Create and initialize a table for a schematic.
function lib_ecology.schematic_array(width, height, depth)
	-- Dimensions of data array.
	local s = {size={x=width, y=height, z=depth}}
	s.data = {}

	for z = 0,depth-1 do
		for y = 0,height-1 do
			for x = 0,width-1 do
				local i = z*width*height + y*width + x + 1
				s.data[i] = {}
				s.data[i].name = "air"
				s.data[i].param1 = 000
			end
		end
	end

	s.yslice_prob = {}

	return s
end

-- Clear all decorations, so I can place the new trees.
--minetest.clear_registered_decorations()

-- A list of all schematics, for re-use.
lib_ecology.schematics = {}
--]]