Squib example for referencing other cards

_references.rb

require 'squib'

# This makes use of Ruby's heredoc - it's just a string
data = Squib.csv data:(<<-CSV)
Name,Cost,Friend
Stringer,3,Avon
Avon,2,Stringer
CSV

Squib::Deck.new(cards: data.nrows, width: 300, height: 300) do
  background color: :white
  rect #black border lines

  text str: data['Name'] # Title at the top
  text str: data['Cost'], x: 250 # Cost at the top

  # Map Name back to index - future-friendly for data changes
  # This example: { 'Stringer' => 0, 'Avon' => 1 }
  idx = {} ; data['Name'].each_with_index{ |name, i| idx[name] = i}

  text str: 'Difference in cost from friend', font_size: 15, y: 100
  friends = data['Friend'].map.with_index do |friend, i|
    my_cost =     data['Cost'][i]
    friend_cost = data['Cost'][idx[friend]] #look up the reference
    my_cost - friend_cost
  end
  text str: friends, y: 150

  save_sheet prefix: 'sheet_'
end