#!/usr/bin/env ruby

require 'optparse'
require 'sshconfig'
include SSHConfig

output = $stdout
input = File.join(ENV["HOME"], ".ssh/sshconfig")

parser = OptionParser.new do |opts|
  opts.banner = "Usage: ssh-update-config"
  opts.on("-h", "--help", "--usage", "Print usage") do
    puts parser.banner
    puts parser.summarize
    exit 0
  end
  opts.on("-o MANDATORY", "--output MANDATORY", "Output destination (default: stdout)") do |out|
    output = File.open(out, "w")
  end
  opts.on("-i MANDATORY", "--input MANDATORY", "Input source (default: ~/.ssh/sshconfig") do |inp|
    input = inp
  end
  opts.on("-l MANDATORY", "--load MANDATORY", "Load an SSHConfig extension") do |ext|
    require ext
  end
end
parser.parse!

load input
output.puts $hostlist
output.flush