Open Source Adventures: Episode 38: Update script for Russian Losses App

I linked to the Russian Losses App many times in various internet arguments. It doesn't currently have a permanent URL for the latest version, and various versions just reflect state of the code at given point.

It makes sense to keep the code as is, but I still want each version to have the latest data. So I wrote this script:

#!/usr/bin/env ruby

require "pathname"

class UpdateCSV
  def initialize(archive_path)
    @archive_path = Pathname(archive_path)
  end

  def updated_equipment
    @updated_equipment ||= (@archive_path + "russia_losses_equipment.csv").read
  end

  def updated_personnel
    @updated_personnel ||= (@archive_path + "russia_losses_personnel.csv").read
  end

  def csv_files
    @csv_files ||= `git ls`.lines.map(&:chomp).grep(/\.csv\z/)
  end

  def call
    csv_files.each do |path|
      case path
      when /russia_losses_equipment/
        Pathname(path).write(updated_equipment)
      when /russia_losses_personnel/
        Pathname(path).write(updated_personnel)
      else
        puts "Unknown CSV file: #{path}"
      end
    end
  end
end

unless ARGV[0]
  STDERR.puts "Usage: #{$0} path_to_updated_archive"
  exit 1
end

UpdateCSV.new(ARGV[0]).call

To run it, I grab updated version from Kaggle, unpack it, and then run the update script.

There's a lot of files it needs to update. The ones in docs are GitHub Pages compiled app:

docs/episode-29/tanks/russia_losses_equipment.csv
docs/episode-29/tanks/russia_losses_personnel.csv
docs/episode-30/russia_losses_equipment.982e4e03.csv
docs/episode-31/russia_losses_equipment.csv
docs/episode-31/russia_losses_personnel.csv
docs/episode-32/russia_losses_equipment.csv
docs/episode-32/russia_losses_personnel.csv
docs/episode-33/russia_losses_equipment.csv
docs/episode-33/russia_losses_personnel.csv
docs/episode-34/russia_losses_equipment.csv
docs/episode-34/russia_losses_personnel.csv
docs/episode-35/russia_losses_equipment.csv
docs/episode-35/russia_losses_personnel.csv
docs/episode-36/russia_losses_equipment.csv
docs/episode-36/russia_losses_personnel.csv
episode-29/tanks/russia_losses_equipment.csv
episode-29/tanks/russia_losses_personnel.csv
episode-30/src/russia_losses_equipment.csv
episode-30/src/russia_losses_personnel.csv
episode-31/public/russia_losses_equipment.csv
episode-31/public/russia_losses_personnel.csv
episode-32/public/russia_losses_equipment.csv
episode-32/public/russia_losses_personnel.csv
episode-33/public/russia_losses_equipment.csv
episode-33/public/russia_losses_personnel.csv
episode-34/public/russia_losses_equipment.csv
episode-34/public/russia_losses_personnel.csv
episode-35/public/russia_losses_equipment.csv
episode-35/public/russia_losses_personnel.csv
episode-36/public/russia_losses_equipment.csv
episode-36/public/russia_losses_personnel.csv

Coming next

Over the next few episodes, I want to add a few new features to the Russian losses tracker.