Add "version" and "help" options

evomaintenance.sh

@@ -4,8 +4,47 @@
 # Dependencies (all OS): git postgresql-client
 # Dependencies (Debian): sudo
 
-# version 0.4.1
-# Copyright 2007-2018 Gregory Colpart <reg@evolix.fr>, Jérémy Lecour <jlecour@evolix.fr>, Evolix <info@evolix.fr>
+# version 0.5.0.beta1
+# Copyright 2007-2019 Evolix <info@evolix.fr>, Gregory Colpart <reg@evolix.fr>,
+#                     Jérémy Lecour <jlecour@evolix.fr> and others.
+
+VERSION="0.5.0.beta1"
+
+show_version() {
+    printf "%s\n" "evomaintenance version ${VERSION}"
+}
+
+show_help() {
+    cat <<END
+$(show_version)
+Copyright 2007-2019 Evolix <info@evolix.fr>, Gregory Colpart <reg@evolix.fr>,
+                    Jérémy Lecour <jlecour@evolix.fr> and others.
+
+evomaintenance comes with ABSOLUTELY NO WARRANTY.  This is free software,
+and you are welcome to redistribute it under certain conditions.
+See the GNU General Public Licence for details.
+
+evomaintenance is a program that helps reporting what you've done on a server
+
+Usage: evomaintenance
+  or   evomaintenance --message="add new host"
+  or   evomaintenance --no-db --no-mail --no-commit
+  or   echo "add new vhost | evomaintenance
+
+Options
+ -m, --message=MESSAGE       set the message from the command line
+     --mail                  enable the mail hook
+     --no-mail               disable the mail hook
+     --db                    enable the database hook
+     --no-db                 disable the database hook
+     --commit                enable the commit hook
+     --no-commit             disable the commit hook
+ -v, --verbose               increase verbosity
+ -n, --dry-run               actions are not executed
+     --help                  print this message and exit
+     --version               print version and exit
+END
+}
 
 get_system() {
     uname -s
@@ -202,10 +241,14 @@ GIT_COMMITS=""
 # based on https://gist.github.com/deshion/10d3cb5f88a21671e17a
 while :; do
     case $1 in
-        # -h|-\?|--help)   # Call a "show_help" function to display a synopsis, then exit.
-        #     show_help
-        #     exit
-        #     ;;
+        -h|-\?|--help)
+            show_help
+            exit 0
+            ;;
+        --version)
+            show_version
+            exit 0
+            ;;
         -m|--message)
             # message options, with value speparated by space
             if [ -n "$2" ]; then