-- This script may be used with the email-filter or repo.email-filter settings in cgitrc.-- It adds gravatar icons to author names. It is designed to be used with the lua:-- prefix in filters. It is much faster than the corresponding python script.---- Requirements:-- 	luaossl-- 	<http://25thandclement.com/~william/projects/luaossl.html>-- local digest = require("openssl.digest") function md5_hex(input)	local b = digest.new("md5"):final(input)	local x = ""	for i = 1, #b do		x = x .. string.format("%.2x", string.byte(b, i))	end	return xend function filter_open(email, page)	buffer = ""	md5 = md5_hex(email:sub(2, -2):lower())end function filter_close()	html("<img src='//www.gravatar.com/avatar/" .. md5 .. "?s=13&amp;d=retro' width='13' height='13' alt='Gravatar' /> " .. buffer)	return 0end function filter_write(str)	buffer = buffer .. strend