Quick and dirty script to merge asciicast files

merge_casts.rb

#!/usr/bin/env ruby
# frozen_string_literal: true

require 'json'
require 'pathname'

cast_files = ARGV.map { |cast| Pathname cast }

#
# Merge files
#
master_cast = cast_files.shift.readlines.map { |line| JSON.parse line }

cast_files.each do |cast|
  last_time = Float master_cast.last.first

  cast.readlines[1..-1].each do |line|
    new_line = JSON.parse(line)

    #
    # Adjust time
    #
    new_line[0] = Float(new_line.first) + last_time

    master_cast << new_line
  end
end

puts master_cast.map { |line| JSON.dump line }.join("\n")