A script that generates an XML file suitable for use by the Gnome Background Properties to change wallpapers.

generator.rb

files = []
puts "<background>
  <starttime>
    <year>2009</year>
    <month>08</month>
    <day>04</day>
    <hour>00</hour>
    <minute>00</minute>
    <second>00</second>
  </starttime>"
puts "  <static>
    <duration>1795.0</duration>
    <file>#{ARGV[1]}</file>
  </static>"

ARGV[2..-1].each_with_index do |filename, i|
    puts "  <transition>
    <duration>5.0</duration>
    <from>#{ARGV[i-1]}</from>
    <to>#{filename}</to>
  </transition>
  <static>
    <duration>1795.0</duration>
    <file>#{filename}</file>
  </static>"
end

puts "  <transition>
    <duration>5.0</duration>
    <from>#{ARGV[-1]}</from>
    <to>#{ARGV[1]}</to>
  </transition>

</background>"