secrets.rb

#!/usr/bin/env ruby

filename = ARGV[0] or exit(0)
i = 1
arg = ARGV[i]
whitelist = []
while arg && arg != '--' do
  whitelist << arg
  i += 1
  arg = ARGV[i]
end
env = File.read(filename)
lines = env.split("\n")
values = lines.map { |l| l.split("=", 2)[1] }

secrets = values.select { |s|
  s && !whitelist.find { |w| s == w }
}

puts secrets