Add help command.

isidore.sh

@@ -23,6 +23,8 @@ ISIDORE_CONFIG_DIR_OPTIONS=(
 	"$HOME/.isidore")
 ISIDORE_AUTHOR_NAME=""
 
+PROG_NAME=$0
+
 ##
 # Create the configuration file. This function is called if it does not already
 # exist.
@@ -76,7 +78,23 @@ function set_config_vars()
 ##
 function print_usage()
 {
-	echo "USAGE: $1 <command> [options]"
+	echo "USAGE: $PROG_NAME <command> [options]"
+}
+
+function print_help()
+{
+	print_usage
+	echo -e "\nCOMMANDS:
+  new <dir> <name>
+    Create a new Isidore project
+  build
+    Build the project rooted in the current directory
+  clean
+    Clean the built files
+  version
+    Print the current version
+  help
+    Show this help information"
 }
 
 ##
@@ -133,7 +151,9 @@ case $1 in
 		new_project $2 $3;;
 	clean)
 		clean_project;;
+	help)
+		print_help;;
 	*)
 		echo "Unknown command $1. Use the 'help' command."
-		print_usage $0;;
+		print_usage;;
 esac