Po.rb

# Usage:
# shell$ irb
# 1.9.3p194 :001 > require '~/Desktop/Po'
# 1.9.3p194 :002 > Po.new('~/code/translation/evolution-data-server.master.ml.po').split(3, 'evolution.po')
# Files named 1_evolution.po, 2_evolution.po, 3_evolution.po will be written to your current working directory.

class Po
  attr_accessor :po_file_array

  def initialize(file)
    @po_file_array = File.open(file, 'r') { |f| f.read }.split("\n\n")
  end

  def split(n, file)
    slice_count = empty_or_fuzzy_translations.count / n
    sliced      = empty_or_fuzzy_translations.each_slice(slice_count).to_a
    sliced.each_with_index do |slice, i|
      slice += sliced.delete(sliced.last) if i == (sliced.count-1) && slice_count != sliced.count
      File.open("#{i+1}_#{file}", 'w') { |f| f.write ([header] + slice).join("\n"*2).gsub("\n"*3, "\n"*2) }
    end
  end

  def header
    po_file_array.first
  end

  private

  def empty_or_fuzzy_translations
    po_file_array[1..-1].select do |po_line|
      po_line.include?('msgstr ""') or po_line.include?('#, fuzzy')
    end
  end
end