nvchecker: add parallel

.repo/nvchecker.toml

@@ -1124,6 +1124,10 @@ cmd = "./.repo/pkgver/sendmail.sh"
 source = "cmd"
 cmd = "./.repo/pkgver/time.sh"
 
+[parallel]
+source = "cmd"
+cmd = "./.repo/pkgver/parallel.sh"
+
 # git
 #[plasma-pass-git]
 #source = "git"

.repo/pkgver/parallel.sh

@@ -0,0 +1,33 @@
+#!/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