url http://code.google.com/p/pdf2djvu/downloads/list
version_link '[.]tar[.][a-z0-9]+$'
process 'code[.]google[.]com//' ''
version '.*_([0-9.]+[0-9]).*' '\1'

do_overwrite () {
  ensure_hash
  set_var_value version "$CURRENT_VERSION"
  set_var_value sha256 "$CURRENT_HASH"
}