gistfile1.rb

require 'pry'
require 'csv'

class FileReader

  def self.read_file(text, record_delim, field_delim, del_col = false)
    ending = -1
    @result = []
    lines_array = text.split(record_delim)
    lines_array.each do |line|
      fields = line.split(field_delim)
      fields.each_index do |index|
        fields[index] = fields[index].force_encoding('UTF-8').encode('BINARY', :undef => :replace, :replace => "")
        fields[index] = fields[index].gsub(/"(.*)"/, '\1')	#removes beginning and end quotes
        fields[index] = fields[index].gsub(/ /, '\1')	#removes spaces
      end
      if del_col == true
        fields.delete_at(-1)
      end
      fields[3].replace(fields[4]) unless fields.length < 5 &&
      @result << fields unless fields.length < 5
      lines_array
    end
    @result
  end

  def self.write_file(file_out)
    CSV.open(file_out, "w") do |csv|
    # here loop over the array elements (rows) 
      @result.each do |row|
        csv << row # here you push the row onto the csv stack
      end 
    end
  end

end

gistfile2.rb

require 'rest_client'
require 'pry'
response = RestClient.get('http://www.google.com')
binding.pry
response = RestClient.post
    auth_token:
    import_type: 'product',
    file: File.new('.csv'))
binding.pry

gistfile3.rb

require './file_reader.rb'

File.open(fname, 'r:ISO-8859-1:UTF-8') do |f|
  text = f.read
  FileReader.read_file(text, "\n", ",", true)
end
FileReader.write_file(file_out)