Quick prawn setup file for font testing

prawn-fonts.rb

require "prawn"

pdf = Prawn::Document.new do |prawn|
  prawn.font_families.update("OpenSans" => {
    normal: "book/assets/fonts/OpenSans-Regular.ttf",
    italic: "book/assets/fonts/OpenSans-Italic.ttf",
    bold: "book/assets/fonts/OpenSans-Bold.ttf",
    bold_italic: "book/assets/fonts/OpenSans-BoldItalic.ttf"
  })
  ["Helvetica", "Courier", "OpenSans"].each do |f|
    prawn.text "Block #{f}"
    prawn.font f do
      prawn.text "block: #{prawn.font.inspect}"
    end
    prawn.move_down 10

    prawn.text "Fallback: #{f}"
    prawn.text "fallback: #{prawn.font.inspect}", fallback_fonts: [f], font: f

    prawn.move_down 50
  end
end

pdf.render_file("bla.pdf")