PDF link modifier script

links.rb

require 'hexapdf'

doc = HexaPDF::Document.open(ARGV[0])
outline = doc.catalog[:Outlines]
first_entry = outline[:First]
last_entry = outline[:Last]

current = first_entry
loop do
  puts current[:Title]
  puts current[:A][:Next][:URI]
  # Change the links here
  current[:A][:Next][:URI] = "https://my.new.url"
  break unless (current = current[:Next])
end

doc.write("#{ARGV[0]}_changed.pdf", optimize: true)