env/bin/rfcopen.sh

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2019-09-11 04:11:40 +02:00
#!/bin/sh
# env
# Written in 2019 by Lucas
# CC0 1.0 Universal/Public domain - No rights reserved
#
# To the extent possible under law, the author(s) have dedicated all
# copyright and related and neighboring rights to this software to the
# public domain worldwide. This software is distributed without any
# warranty. You should have received a copy of the CC0 Public Domain
# Dedication along with this software. If not, see
# <http://creativecommons.org/publicdomain/zero/1.0/>.
usage() {
printf "Usage: %s [-T] rfc-number\n" "${0##*/}" >&2
exit 1
}
tonumber() {
printf "%u" "$1" 2>/dev/null
}
: ${RFCDIR:=~/doc/rfc}
torsocks=torsocks
while getopts T flag; do
case $flag in
T) torsocks=
;;
*) usage
;;
esac
done
shift $(($OPTIND - 1))
if [ $# -ne 1 ] || [ -z "$1" ] || ! n=$(tonumber "$1"); then
usage
fi
rfcfile=$RFCDIR/rfc$n.txt
url=https://tools.ietf.org/rfc/rfc$n.txt
mkdir -p "$RFCDIR"
if [ ! -f "$rfcfile" ]; then
if ! $torsocks ftp -Vo "$rfcfile" "$url"; then
printf "%s: Couldn't fetch RFC %u\n" "${0##*/}" "$n" >&2
exit 1
fi
fi
${PAGER:-more} "$rfcfile"