Prepare images for printing

pre-print.rb

#!/usr/bin/env ruby

min_width = `identify *.jpg`
    .split("\n")
    .map { |i| i[/JPEG (\d+x\d+)/, 1] }
    .map { |i| i.split "x" }
    .transpose[0]
    .map { |i| i.to_i }
    .min

p min_width

system "rm -rf print"
system "mkdir -p print"
Dir["*.jpg"].sort_by { |i| i[/\d+/].to_i }.each_slice(4).each_with_index do |images, index|
    p images
    p index
    system %Q{montage -quality 100% -tile 2x2 -geometry 1920x1920+100+539 #{images.join " "} print/cups-#{index}.jpg}
end