Given a number of home directories containing Maildir subdirectories, I want to recursively count both unread and total messages, along with the date/time of the first/last message in that Maildir. This script is supposed to run from the base directory co

scan.rb

#!/usr/bin/env ruby -w

result = Hash.new{|h, k| h[k] = {
    :count => 0,
    :unread => 0,
    :first => nil,
    :last => nil
  }
}

Dir.glob("**/{cur,new}", File::FNM_DOTMATCH).each do |d|
  parts = d.split(File::SEPARATOR).reverse
  username = parts.pop
  parts.pop # remove 'Maildir'
  r = result[username]
  size = Dir.entries(d).size - 2
  if parts.first == 'new'
    r[:unread] += size
  end
  r[:count] += size
  
  Dir.entries(d).each do |f|
    next if ['.', '..'].include?(f)
    fp = File.expand_path(f, d)
    r[:first] = File.mtime(fp) if r[:first].nil? || File.mtime(fp)<r[:first]
    r[:last]  = File.mtime(fp) if r[:last].nil?  || File.mtime(fp)>r[:last]
  end
end

puts "email;count;unread;first;last"
result.each do |user, values|
  print "#{user}@domain.com;#{values[:count]};#{values[:unread]};"
  print "#{values[:first].strftime('%d.%m.%Y %H:%M:%S')}" unless values[:first].nil?
  print ";"
  print "#{values[:last].strftime('%d.%m.%Y %H:%M:%S')}" unless values[:last].nil?
  puts
end

STDOUT.flush