Add simple_timer

.local/bin/simple_timer

@@ -0,0 +1,29 @@
+#! /bin/sh -
+
+min="${1-}"
+sec="${2-}"
+
+if [ -z "${min}" ] || [ -z "${sec}" ] || [ -n "${3-}" ] ; then
+	printf '%s\n' "Usage: ${0-} MIN SEC"
+	exit 1
+fi
+
+print_as_minutes () {
+	_total_sec="${1}"
+	min="$((_total_sec / 60))"
+	sec="$((_total_sec % 60))"
+	clear -x
+	n_lines="$(($(tput lines) / 2 - 4))"
+	while [ "${n_lines}" -ge "0" ] ; do
+		printf '\n'
+		n_lines="$((n_lines - 1))"
+	done
+	figlet -w "$(tput cols)" -c "${min} : ${sec}"
+}
+
+total_sec="$((min * 60 + sec))"
+while [ "${total_sec}" -ge "0" ] ; do
+	print_as_minutes "${total_sec}"
+	sleep 1s
+	total_sec="$((total_sec - 1))"
+done