python_version.rb

# Make python versions available as facts

def get_python_version(executable)
  if Facter::Util::Resolution.which(executable) # rubocop:disable Style/GuardClause
    results = Facter::Util::Resolution.exec("#{executable} -V 2>&1").match(%r{^.*(\d+\.\d+\.\d+\+?(?:rc\d+)?)$})
    results[1] if results
  end
end

Facter.add('python_version') do
  setcode do
    get_python_version 'python'
  end
end

Facter.add('python2_version') do
  setcode do
    default_version = get_python_version 'python'
    if default_version.nil? || !default_version.start_with?('2')
      get_python_version 'python2'
    else
      default_version
    end
  end
end

Facter.add('python3_version') do
  setcode do
    get_python_version 'python3'
  end
end