CSV File splitter

file_splitter.rb

# Usage: FileSplitter.new('/usr/share/dict/words').split_into 10

class FileSplitter
  def initialize(path)
    @file = File.open path
  end

  def split_into(n)
    i = 1
    m = slice_size(n)
    data_array.each_slice(m) do | batch |
      data = batch.join("\n")
      write_to_file(data, new_filename(i))
      i = i + 1
    end
  end

  private

  def data_array
    @data ||= @file.read.split("\n")
  end

  def new_filename(i)
    "#{filename}_#{i}"
  end

  def filename
    File.basename(@file.path)
  end

  def write_to_file(data, name)
    open(name, 'w') do |f|
      f.puts data
    end
  end

  def slice_size(a)
    (data_array.size/a)
  end

end