Dayone importer from Hatena diary backup file

dayone_importer_hatena.rb

#!/usr/bin/env ruby
# coding: utf-8

require "tempfile"

article = ""
microseconds = ""
subject = ""
date = ""
in_day = in_article = false

while line = gets
  line.gsub!(/\&/, '&')
  line.gsub!(/\"/, '"')
  line.gsub!(/\[(.*):title=(.*)\]/, '[\2](\1)')
  if line =~ /^\<day date="([0-9-]+)" .*\>$/
    date = $1
    in_day = true
    next
  end
  if in_day && (line =~ /^\*([0-9]+)\*(.*)$/)
    if in_article
      temp = Tempfile.new
      begin
        temp.puts article
        temp.flush
        system "dayone2 -d='#{Time.at(microseconds.to_i)}' -j=hatena new < #{temp.path}"
      ensure
        temp.close
        temp.unlink
      end
      in_article = false
      article = ""
    end
    microseconds = $1
    subject = $2
    article += "# #{subject}\n\n"
    in_article = true
    next
  end
  if in_article && (line !~ /^\<\//)
    article += line
  elsif in_article && (line =~ /^\<\//)
    temp = Tempfile.new
    begin
      temp.puts article
      temp.flush
      system "dayone2 -d='#{Time.at(microseconds.to_i)}' -j=hatena new < #{temp.path}"
    ensure
      temp.close
      temp.unlink
    end
    in_article = false
    article = ""
  end
end

temp.flush is required because it seems to be late to write the content into the temporary file until flush method is executed.