Simple script to convert HRM data from XML documents exported via http://www.personaltrainer.com (e.g. for use with RunKeeper)

pptxml2hrm.rb

#!/usr/bin/env ruby
require 'rexml/document'

def file_name(file)
  if file.end_with?(".xml") then
    file = file.gsub(".xml", ".hrm")
  else
    file = "#{file}.hrm"
  end  
  return file
end

if ARGV.count == 1 then
  file = ARGV.first  
  
  if File.exists?(file) then
    xmlfile = File.open(file, 'rb')    
    xmldoc = REXML::Document.new(xmlfile.read)         
    hrmdata = xmldoc.elements['polar-exercise-data/calendar-items/exercise/result/samples/sample/values'].get_text    

    open(file_name(file), 'w') { |f|
      f << "[Params]\nInterval=5\n[HRData]\n"
      "#{hrmdata}".split(',').each do |v|
        f << "#{v}\n"
      end
    }        
  else
    puts "Could not find #{ARGV.first}"
  end  
else
  puts "Usage: 'ruby xml2hrm polarpersonaltrainer.xml'"
end