Ruby filter for aligning tab-separated input

align.rb

#!/usr/bin/env ruby

lines = []
maxes = []
while raw = gets
  lines << line = raw.chomp.split(/\t+/)
  line.each_with_index do |token, idx|
    maxes[idx] = [maxes.fetch(idx, 0), token.length].max
  end
end

lines.each do |line|
  line.zip(maxes).each do |(token, width)|
    print token.ljust(width + 1)
  end
  puts
end