kml2gpx.rb

#!/usr/bin/env ruby
# Generate gpx for Xcode from Google Earth kml.

require 'time'
require 'nokogiri'

seconds_per_point = 2
timestamp = Time.now.to_i

doc = Nokogiri::XML(open(ARGV[0]))
coordinates = doc.css('coordinates').text.strip.split(/\s+/).map { |s| s.split(',') }

builder = Nokogiri::XML::Builder.new do |xml|
  xml.gpx do
    coordinates.each_with_index do |coord, index|
      xml.wpt(:lat => coord[1], :lon => coord[0]) do
        xml.ele { xml.text coord[2] }
        xml.time { xml.text Time.at(timestamp + index * seconds_per_point).iso8601 }
      end
    end
  end
end

puts builder.to_xml