Script to maintain a list of torrents from webpages using data-bt attributes to link to those.

update.torrents.sh

#!/bin/sh
# 2013 CC0 http://creativecommons.org/publicdomain/zero/1.0/
# Got a little annoyed by searching for game updates on HB webpage ...
[ $# -lt 2 ] && echo Usage: $(basename "$0") input-file output-dir && exit 1
[ ! -f "$1" ] && ([ -t 0 ] || [ "$1" != - ]) && echo Invalid input-file \'$1\' && exit 1
[ ! -d "$2" ] && ! mkdir -p "$2" && echo Invalid output-dir \'$2\' && exit 1 || out="$2"
bt=$(date +"%Y%m%d%H%M%S") && mkdir "$out/$bt" && bt="$bt/bt"
grep -m 1 'data-bt="' "$1" > /dev/null && S=\" || S=\'
grep -o "data-bt=$S.*://.*$S" "$1" | sed "s/^data-bt=\|$S//g" | sort | uniq > "$out/$bt"
[ x"$S" = x\" ] && sed -i "s/&/\&/g" "$out/$bt"
sed 's/\.torrent\?.*$/.torrent/' "$out/$bt" > "$out/$bt.urls"
btlu=0-latest.urls && [ -f "$out/$btlu" ] || touch "$out/$btlu"
diff --old-line-format '%L' --new-line-format '' --unchanged-line-format '' "$out/$btlu" "$out/$bt.urls" > "$out/$bt.removed"
diff --old-line-format '' --new-line-format '%L' --unchanged-line-format '' "$out/$btlu" "$out/$bt.urls" > "$out/$bt.added"
grep -f "$out/$bt.added" "$out/$bt" | wget -P "$out" -o "$out/$bt.log" -i -
ln -sf "$bt.urls" "$out/$btlu"
rename -f 's/\.torrent\?[^\*].*$/.torrent/' "$out"/*.torrent\?*