Allow some basics options (-h and -d)

cluster/apt.check.update.sh

@@ -13,7 +13,7 @@ readonly PROGNAME=$(basename "${0}")
 readonly PROGDIR=$(readlink -m $(dirname "${0}"))
 readonly ARGS="${*}"
 readonly NBARGS="${#}"
-[ -z "${DEBUG}" ] && readonly DEBUG=1
+[ -z "${DEBUG}" ] && DEBUG=1
 ## Export DEBUG for sub-script
 export DEBUG
 
@@ -26,21 +26,6 @@ readonly RESET='\033[0m'
 readonly COLOR_DEBUG="${PURPLE}"
 # }}}
 
-manage_args() {                                                 # {{{
-
-	case "${NBARGS}" in
-		0 ) ## Nothing to do
-			;;
-		* )
-			printf '%b\n' "${RED}Don't expect any arguments.${RESET}"
-			printf '%b\n' "---"
-			usage
-			exit 1
-			;;
-	esac
-
-}
-# }}}
 usage() {                                                       # {{{
 
 	cat <<- EOF
@@ -53,6 +38,13 @@ try to prepare the host by :
 EXAMPLES :
     - Verify upgrade and prepare the current host
         ${PROGNAME}
+
+OPTIONS :
+    -d,--debug
+        Enable debug messages.
+
+    -h,--help
+        Print this help message.
 	EOF
 
 }
@@ -141,8 +133,6 @@ Pending jobs for the compute cluster: ${RED}${local_pending_jobs:=/dev/null}${CO
 # }}}
 main() {                                                        # {{{
 
-	manage_args "${ARGS}"
-
 	sge_disable_host_queue_script="${PROGDIR}/sge.disable.host.queue.sh"
 
 	## If NO APT package upgrade is available {{{
@@ -176,6 +166,62 @@ main() {                                                        # {{{
 }
 # }}}
 
+# Manage arguments                                                # {{{
+# This code can't be in a function due to arguments
+
+if [ ! "${NBARGS}" -eq "0" ]; then
+
+	manage_arg="0"
+
+	## If the first argument is not an option
+	if ! printf -- '%s' "${1}" | grep -q -E -- "^-+";
+	then
+		## Print help message and exit
+		printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
+		printf '%b\n' "---"
+		usage
+
+		exit 1
+	fi
+
+	# Parse all options (start with a "-") one by one
+	while printf -- '%s' "${1}" | grep -q -E -- "^-+"; do
+
+	case "${1}" in
+		-d|--debug )           ## debug
+			DEBUG=0
+			;;
+		-h|--help )            ## help
+			usage
+			## Exit after help informations
+			exit 0
+			;;
+		* )                    ## unknow option
+			printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
+			printf '%b\n' "---"
+			usage
+			exit 1
+			;;
+	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
+
+# }}}
+
 main
 
 exit 255