+filter="$(
+ seq 0 100 |while read n; do
+ filter_type="$(POST "filter_type${n}")"
+ filter_text="$(POST "filter_text${n}")"
+ if [ ! "$filter_type" -a ! "$filter_text" ]; then
+ break
+ elif [ "$filter_type" = CATEGORIES ]; then
+ printf '^CATEGORIES:'
+ seq 0 $(POST_COUNT filter_cat$n) |while read m; do
+ printf '|%s' "$(POST filter_cat$n $m)"
+ done
+ elif [ "$filter_type" = course ]; then
+ printf '^course:'
+ seq 0 $(POST_COUNT filter_course$n) |while read m; do
+ printf '|%s' "$(POST filter_course$n $m)"
+ done
+ else
+ printf '^%s:%s' "$filter_type" "$filter_text"
+ fi
+ done | sed -E \
+ 's;\|+;\|;g; s;\^+;\^;g; s;:\|;:;g;
+ :X; s;\^[^:]*:\^;\^;g; /\^[^:]*:\^/bX;
+ s;^\^;;; s;\^[^:]*:$;;;'
+)"