function file_lines_to_table(filename)
	local file = {}
	for line in io.lines(filename) do
		table.insert(file, line)
	end
	return file
end

function file_characters_to_table(filename)
	local file = {}
	for line in io.lines(filename) do
		local lineelements = {}
		for I = 1, string.len(line) do
			c = string.sub(line, I, I)
			table.insert(lineelements, c)
		end
		table.insert(file, lineelements)
	end
	return file
end

function tablelength(T)
	local count = 0
	for _ in pairs(T) do
		count = count + 1
	end
	return count
end

function print_table(t, indent)
	indent = indent or ""
	for k, v in pairs(t) do
		if type(v) == "table" then
			print(indent .. k .. ":")
			print_table(v, indent .. "  ")
		else
			print(indent .. k .. ": " .. tostring(v))
		end
	end
end