mailq parse example

gistfile1.rb

msgs = {}
state = nil
id = nil
mqstdout.each_line do |line|
  line.strip!
  case
  when state.nil? && /^(?<msgid>[0-9A-F]+)\s+(?<size>[0-9]+)\s+(?<date>.+[^\s])\s+(?<sender>[^\s]+)$/ =~ line
    id = msgid
    msgs[id] = {
      size: size.to_i,
      date: date,
      sender: sender
    }
    state = :meta
  when state == :meta
    msgs[id][:reason] = line
    state = :reason
  when state == :reason
    msgs[id][:recipient] = line
    state = nil
  end
end