Create a grub-list.zsh command

For listing the available kernels on the current machine

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

completions/_grub-list.zsh

@@ -0,0 +1,7 @@
+#compdef grub-list.zsh
+
+function _grub-list.zsh() {
+	_arguments \
+		{-h,--help}'[print help text]' \
+		{-e,--entries-only}'[print entries without row numbers]'
+}

grub-list.zsh

@@ -0,0 +1,19 @@
+#!/bin/zsh
+
+cmd=$0
+zparseopts e=entries -entries-only=entries h=help -help=help
+
+if [ ! -z "$help" ]; then
+	echo "Usage: $0 [-h|--help] [-e|--entries-only]"
+	echo "List the available GRUB menu options."
+	echo "  -e, --entries-only   print menu entries without row numbers"
+	echo "  -h, --help           print this message and exit"
+	exit 0
+fi
+
+menuentries=$(sudo awk -F\' '/menuentry / {print $2}' /boot/grub/grub.cfg)
+if [ -z "$entries" ]; then
+	echo $menuentries | awk '{print "    ", NR-1, " ", $0}'
+else
+	echo $menuentries
+fi