Add debug mode and help message

winboot

@@ -9,6 +9,10 @@ readonly PROGDIR=$(readlink -m $(dirname "${0}"))
 readonly ARGS="${*}"
 readonly NBARGS="${#}"
 
+## Debug mode to print specific messages
+DEBUG=1
+
+## Grub specific vars
 readonly GRUB_DEFAULT_PATH='/etc/default/grub'
 readonly GRUB_DEFAULT_DIR='/etc/default/grub.d'
 readonly WIN_GRUB="2"
@@ -17,8 +21,54 @@ readonly WIN_GRUB="2"
 REBOOT=0
 HALT=1
 
+## Colors
+readonly PURPLE='\033[1;35m'
+readonly RED='\033[0;31m'
+readonly RESET='\033[0m'
+readonly COLOR_DEBUG="${PURPLE}"
+
 # }}}
 
+usage() {                                                       # {{{
+
+	cat <<- EOF
+usage: $PROGNAME [-d,--debug|-h,--help|--halt,--poweroff|--reboot]
+
+Try to set a specific grub's entry for the next boot and
+reboot the host (default behaviour).
+
+EXAMPLES :
+    - Set the grub entry ${WIN_GRUB} (Windows by default) and reboot
+        ${PROGNAME}
+
+    - Set the grub entry ${WIN_GRUB} (Windows by default) and shutdown
+        ${PROGNAME} --halt
+
+OPTIONS :
+    -d,--debug
+        Enable debug messages.
+
+    -h,--help
+        Print this help message.
+
+    --halt,--poweroff
+        Ask to shutdown at the end of the script.
+
+    --reboot
+        Ask to reboot at the end of the script (default behaviour).
+EOF
+
+}
+# }}}
+debug_message() {                                               # {{{
+
+	local_debug_message="${1}"
+
+	## Print message if DEBUG is enable (=0)
+	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME} : ${local_debug_message}"
+
+}
+# }}}
 main() {                                                        # {{{
 
 	# First check in Grub default dir if saved mode is set
@@ -60,14 +110,22 @@ if [ ! "${NBARGS}" -eq "0" ]; then
 	while printf -- '%s' "${1}" | grep -q -E -- "^-+"; do
 
 	case "${1}" in
-		--reboot )          ## A reboot was requested (default behaviour)
-			REBOOT=0
-			HALT=1
+		-d|--debug )        ## debug
+			DEBUG=0
+			;;
+		-h|--help )         ## help
+			usage
+			## Exit after help informations
+			exit 0
 			;;
 		--halt|--poweroff ) ## A poweroff was requested
 			REBOOT=1
 			HALT=0
 			;;
+		--reboot )          ## A reboot was requested (default behaviour)
+			REBOOT=0
+			HALT=1
+			;;
 		-- )                ## End of options list
 			## End the while loop
 			break
@@ -80,12 +138,20 @@ if [ ! "${NBARGS}" -eq "0" ]; then
 			;;
 	esac
 
+	debug_message "Arguments management − \
+${RED}${1}${COLOR_DEBUG} option managed."
+
 	## Move to the next argument
 	shift
 	manage_arg=$((manage_arg+1))
 
 	done
 
+	debug_message "Arguments management − \
+${RED}${manage_arg}${COLOR_DEBUG} argument(s) successfully managed."
+else
+	debug_message "Arguments management − \
+No arguments/options to manage."
 fi
 
 # }}}