rule34xxx_can_handle() {
  local url="${1}"
  echo "${url}" | grep -qi 'rule34.xxx/index.php?page=post&s=view&id=[0-9]*' || return 1
  taggery_id_filter=rule34xxx_id_filter
  taggery_fmturl="https://rule34.xxx/index.php?page=post&s=view&id=%s"
  taggery_image_name_filter=rule34xxx_image_name_filter
  taggery_image_url_filter=rule34xxx_image_url_filter
  taggery_image_tags_filter=rule34xxx_image_tags_filter
}
rule34xxx_id_filter() {
  sed -e 's#^.*id=\([0-9]\+\)\($\|&.*$\)#\1#'
}
rule34xxx_image_url_filter() {
  sed -e '/>Original image</!d; s/>Original image.*//i; s/^.*<a //i; s/^.*href="\([^"]*\)".*$/\1/i; /:\/\//!s/^/https:/'
}
rule34xxx_image_tags_filter() {
  sed -e '/id="tag-sidebar"/,/<\/ul>/!d; /href=".*tags=/!d; s/<[^>]*>//g; s/ /_/g'
}
rule34xxx_image_name_filter() {
  local id="${1}"
  local image_url="${2}"
  basename "${image_url}"
}