gistfile1.txt

require 'csv'
def import(filename, out = $stdout, &block)
  # Yes, there are gems that do progress bars.
  # No, I'm not about to add another dependency for something this simple.
  width     = `tput cols`.to_i - 4
  processed = 0
  total     = File.read(filename).lines.length.to_f - 1
  label     = File.basename(filename, '.csv')

  out.puts "%11s:" % label

  CSV.foreach(filename, headers: true) do |row|
    yield row

    processed += 1
    percent = processed / total
    wanted  = (percent * width).ceil
    out.print "-" * wanted
    out.print " " * (width - wanted)
    out.print (percent * 100).to_i.to_s + "%"
    out.print "\r"
  end
end