converts ssh_config to essh config.lua

ssh2essh.rb

ssh_config = File.read(ENV.fetch('HOME') + "/.ssh/config")

group = {}
host = []
ssh_config.each_line do |line|
  line.strip!

  if line.start_with?(/Host |host /)
    unless host.empty?
      values = host[1..-1].map { |str| [str.strip.split(" ", 2)].to_h }.inject(&:merge)
      group[host[0]] = values
    end

    host = [line.split(" ", 2).last]
  elsif line.match?(/\A\z/)
    next
  else
    host << line
  end
end

config = group.map do |host_name, options|
  option_contents = options.transform_keys(&:capitalize).map do |key, value|
    <<~TEMPLATE
      #{key} = "#{value}",
    TEMPLATE
  end

  option_contents << [
    "description = \"\",\n",
    "tags = {}\n"
  ]

  <<~TEMPLATE
    host "#{host_name}" {
        #{option_contents.join('    ')}}

  TEMPLATE
end

puts config