usage: ruby mailcount.rb [searchDir] [outputFile]

mailcount.rb

#!/usr/bin/ruby
require 'rubygems'
require 'tmail'

re = /^(.*[^\/\*])((?:\/)?(?:\*)?)$/
dir = ARGV[0] ? ARGV[0].gsub(re, "\\1/*{.txt,.eml}") : "./*{.txt,.eml}"
outfile = ARGV[1] ? ARGV[1] :
  "./result_#{Time.now.strftime('%y%m%d.%H%M%S')}.csv"
  
puts "search for: #{dir}", "output into: #{outfile}"

mails = Dir.glob(dir).delete_if{|name| /\.rb$/ =~ name}
count = {}
mails.each do |file|
  dt = TMail::Mail.load(file).date.strftime("%Y/%m/%d")
  count[dt] ? count[dt] += 1 : count[dt] = 1
end

f = File.open(outfile, "w+")

count.keys.sort.each do |k|
  f.puts [k, count[k]].join(',')
end

f.close

puts "successfully end."