danbooru_can_handle() {
  local url="${1}"
  echo "${url}" | grep -qi 'danbooru.donmai.us/posts/[0-9]*' || return 1
  taggery_id_filter=danbooru_id_filter
  taggery_fmturl="https://danbooru.donmai.us/posts/%s"
  taggery_image_url_filter=danbooru_image_url_filter
  taggery_image_tags_filter=danbooru_image_tags_filter
}
danbooru_id_filter() {
  sed -e 's#^.*/posts/\([0-9]\+\)\($\|/.*$\)#\1#'
}
danbooru_image_url_filter() {
  sed -e '/Size: /!d; s/^.*<a //i; s/^.*href="\([^"]*\)".*$/http:\/\/danbooru.donmai.us\1/i'
}
danbooru_image_tags_filter() {
  sed -e '/class="search-tag"/!d; s/<\/li>/&\n/g' | sed -e '/class="search-tag/!d; s/\([^?]\)<\/a>.*$/\1/; s/^.*>//; s/ /_/g'
}