+w_refuri="$(URL "$PATH_INFO")?$(HTML "$QUERY_STRING")"
+
+w_str_s="$(STRING "$SEARCH")"
+w_str_f="$(STRING "$FILTER")"
+
+c_tags="$_DATA/.index/tags.cache"; c_tagcategories="$_DATA/.index/tagcategories.cache"
+if [ ! -s "$c_tags" -o ! -s "$c_tagcategories" ] \
+ || [ "$(find "$_DATA/" -path '*/.index/meta' -newer "$c_tags")" ]
+ then
+ w_tags="$(
+ list_meta |sed -E '
+ s;^.*\ttags=([^\t]*)\t.*$;\1;;
+ s;,;\n;g;
+ ' \
+ | sort |uniq -c |sort -rn |sed -E 's;^ *[0-9]+ ;;;' \
+ | UNSTRING | HTML \
+ | sed -E 's;
\;;\n;g; s;\n+;\n;g;'
+ )"
+ w_tagcategories="$(printf %s "$w_tags" | sed -rn '/:/s;^-?([^:]+):.*$;\1;p' |sort -u )"
+ printf %s "$w_tags" >"$c_tags"
+ printf %s "$w_tagcategories" >"$c_tagcategories"
+else
+ w_tags="$(cat "$c_tags")"
+ w_tagcategories="$(cat "$c_tagcategories")"
+fi