Go-inspired exports based on variable capitalization

golike_exports.lua

local parent = getfenv(1)
local private = {}
local public = {}
setfenv(1, setmetatable({}, {__newindex = function(self, key, value)
	local first = key:sub(1, 1);
	((first >= "A" and first <= "Z") and public or private)[key] = value
end, __index = function(self, key)
	local value = private[key]
	if value ~= nil then
		return value
	end
	local value = public[key]
	if value ~= nil then
		return value
	end
	return parent[key]
end}))

function privateFunc()
	print"hello world"
end

function PublicFunc()
	privateFunc()
end

assert(private.privateFunc and not private.PublicFunc)
assert(public.PublicFunc and not public.privateFunc)

return public