env/bin/rfcopen.sh

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#!/bin/sh
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# rfcopen
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# Written in 2019-2020 by Lucas
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# 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/>.
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usage()
{
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printf "Usage: %s [-T] rfc-number\n" "${0##*/}" >&2
exit 1
}
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err()
{
printf "%s: %s\n" "${0##*/}" "$*" >&2
exit 1
}
tonumber()
{
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printf "%u" "$1" 2>/dev/null
}
: ${RFCDIR:=~/doc/rfc}
torsocks=torsocks
while getopts T flag; do
case $flag in
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T) torsocks= ;;
*) usage ;;
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esac
done
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shift $((OPTIND - 1))
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[ $# -eq 1 ] && [ -n "$1" ] && n=$(tonumber "$1") || usage
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rfcfile=$RFCDIR/rfc$n.txt
url=https://tools.ietf.org/rfc/rfc$n.txt
mkdir -p "$RFCDIR"
if [ ! -f "$rfcfile" ]; then
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$torsocks ftp -Vo "$rfcfile" "$url" || err "couldn't fetch RFC $n"
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fi
${PAGER:-more} "$rfcfile"