arch-pkgs/.repo/pkgver/parallel.sh

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#!/bin/bash
set -e
# check dependencies
count=0
for dependency in curl tr cut grep sed sort tail; do
if [ ! -x "$(command -v $dependency)" ]; then
echo "$dependency missing"
count=$((count+1))
fi
done
# exit script if any dependencies missing
if [ $count -ne 0 ]; then
exit 1
fi
# upstream URL
UPSTREAM_URL="ftp://ftp.gnu.org/gnu/parallel/"
# options to pass to cURL, including custom user agent
USER_AGENT="parallel-version-checker/1.0 george@rawlinson.net.nz"
CURL_OPTS=(--ftp-pasv --silent --user-agent "$USER_AGENT")
curl "${CURL_OPTS[@]}" "$UPSTREAM_URL" | \
tr -s ' ' | \
cut -d ' ' -f 9 | \
grep -E "parallel-[[:digit:]]+\.tar\.bz2\.sig$" | \
sed -e 's/^parallel-//' -e 's/\.tar\.bz2\.sig$//' | \
sort -n | \
tail -n 1
exit 0