cards_filter.rb


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require 'json'

input = File.open(ARGV[0]) do |file|
  JSON.load(file)
end

filtered = input.select do |cardJson|
  cardJson["object"] == "card" &&
  # It needs to have a downloadable image
  cardJson.count("image_uris") &&
  # Make sure we can support the card layout
  ["normal", "leveler", "saga"].include?(cardJson["layout"]) &&
  # We only support modern and m15 frames
  ["2015", "2003"].include?(cardJson["frame"]) &&
  # Digital cards look slightly different so ignore them
  !cardJson["digital"] &&
  # Only use english printings
  cardJson["lang"] == "en" &&
  # Currently not supporting silver bordered cards
  cardJson["border_color"] != "silver" &&
  # It is hard to read the name of a planeswalker
  !cardJson["type_line"].include?("Planeswalker") &&
  # This cuts out checklists and special tokens
  cardJson["type_line"] != "Card" &&
  # Amonkhet invocations are impossible
  cardJson["set"] != "mp2" &&
  # Unknown Event is not a real thing huh
  cardJson["set"] != "da1"
end.map do |cardJson|
  {
    "id" => cardJson["id"],
    "name" => cardJson["name"],
    "imageUri" => cardJson["image_uris"]["png"],
    "frame" => cardJson["frame"],
    "artist" => cardJson["artist"]
  }
end

File.open(ARGV[1], 'w') do |file|
  JSON.dump(filtered, file)
end