Parsing arbitrary options to wrap ssh

gistfile1.rb

#!/usr/bin/env ruby

# gwssh: ssh via a gateway host

# We want to find the hostname so we can add tiptap.com. The hostname will be the
# first string in ARGV that isn't a standalone option and that isn't itself the argument
# for an option (e.g. in "-F configfile", configfile is not the hostname).

# This feels very hacky, and I wonder if there's a more elegant way.

OPTIONS_WITH_ARGUMENTS = 'bcDeFiLlmOopRSw'

skip_argument = false
original_host = nil

ARGV.each do |a|
  if skip_argument
    skip_argument = false
    next

  elsif a.start_with?('-')
    if OPTIONS_WITH_ARGUMENTS.include?(a[1])
      skip_argument = true
      next
    end

  else
    original_host = a
  end
end

puts original_host