added basic whiptail based script menu

menu_start_doth_dns.bash

@@ -0,0 +1,68 @@
+#!/bin/bash
+
+# ==============================================================================
+# Copyright (c) 2019 Christian Riedel
+# 
+# This file 'start_menu.bash' created 2019-11-29 is part of the project/program 'DoTH-DNS'.
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the MIT License as published by
+# the Massachusetts Institute of Technology.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# MIT License for more details.
+#
+# You should have received a copy of the MIT License
+# along with this program. If not, see <https://opensource.org/licenses/MIT>.
+# 
+# Github: https://github.com/Cielquan/
+# ==============================================================================
+
+
+err_script() {
+  whiptail --msgbox "'start_doth_dns.bash' failed. You may need to restart the menu script with root privileges." 10 60 1
+  exit 1
+}
+
+do_start() {
+  ./start_doth_dns.bash || err_script
+  whiptail --msgbox "DoTH-DNS started." 10 60 1
+}
+
+do_restart() {
+  ./start_doth_dns.bash -R || err_script
+  whiptail --msgbox "DoTH-DNS restarted." 10 60 1
+}
+
+do_update() {
+  ./start_doth_dns.bash -U || err_script
+  whiptail --msgbox "DoTH-DNS update done and restarted." 10 60 1
+}
+
+do_down() {
+  ./start_doth_dns.bash -D || err_script
+  whiptail --msgbox "DoTH-DNS shut down." 10 60 1
+}
+
+
+while true; do
+  MENU=$(whiptail --title "DoTH-DNS menu" --menu "Choose an action for DoTH-DNS:" 20 60 4 --cancel-button Exit --ok-button Select\
+    "1 Start DoTH-DNS" "" \
+    "2 Restart DoTH-DNS" "" \
+    "3 Update DoTH-DNS" "" \
+    "4 Shut down DoTH-DNS" "" \
+    3>&1 1>&2 2>&3)
+  MENU_RV=$?
+  if [ $MENU_RV -eq 0 ]; then
+    case "$MENU" in
+      1\ *) do_start ;;
+      2\ *) do_restart ;;
+      3\ *) do_update ;;
+      4\ *) do_down ;;
+      *) whiptail --msgbox "Programmer error: unrecognized option" 10 60 1 ;;
+    esac || whiptail --msgbox "There was an error running option $MENU" 10 60 1
+  else
+    exit 1
+  fi
+done