covid19data.rb

require 'date'
require "open-uri"

class Covid19Data

  attr_reader :date, :month, :year, :day

  def initialize(date)
    @date = date
    @month = Covid19Data.padded(date.month)
    @year  = date.year
    @day   = Covid19Data.padded(date.day)
  end

  def filename
    "#{@month}-#{@day}-#{@year}.csv"
  end

  def download
    unless File.exists?(self.filename)
      begin
        open(self.data_url) do |csvfile|
          File.open(self.filename, "wb") do |file|
            puts "Downloading #{self.filename}"
            file.write(csvfile.read)
          end
        end
      rescue
        #file doesnt exist, skip?
        puts "no data for #{self.filename}"
      end
    end
  end

  def data_url
    "https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_daily_reports/#{self.filename}"
  end

  def self.padded(num)
    if num > 9
      num
    else
      "0#{num}"
    end
  end

end


from = Date.parse("1/1/2020")
to   = Date.today

step = from


loop do

  covidata = Covid19Data.new(step)
  covidata.download

  if step >= to
    break
  end

  step = step.next

end