Add GetRequiredArg helper

helpers.go

@@ -0,0 +1,18 @@
+package getoptions
+
+import "fmt"
+
+// GetRequiredArg - Get the next argument from the args list and error if it doesn't exist.
+// By default the error will include the HelpSynopsis section but it can be overriden with the list of sections or getoptions.HelpNone.
+func GetRequiredArg(opt *GetOpt, args []string, argName string, sections ...HelpSection) (string, []string, error) {
+	if len(args) < 1 {
+		fmt.Fprintf(Writer, "ERROR: missing %s\n", argName)
+		if sections != nil {
+			fmt.Fprintf(Writer, "%s", opt.Help(sections...))
+		} else {
+			fmt.Fprintf(Writer, "%s", opt.Help(HelpSynopsis))
+		}
+		return "", args, ErrorHelpCalled
+	}
+	return args[0], args[1:], nil
+}

user_help.go

@@ -13,7 +13,8 @@ type HelpSection int
 
 // Help Output Types
 const (
-	helpDefaultName HelpSection = iota
+	HelpNone HelpSection = iota
+	helpDefaultName
 	HelpName
 	HelpSynopsis
 	HelpCommandList