commands: Added Recursive modifier to Argument

commands/argument.go

@@ -10,9 +10,10 @@ const (
 type Argument struct {
 	Name          string
 	Type          ArgumentType
-	Required      bool
-	Variadic      bool
-	SupportsStdin bool
+	Required      bool // error if no value is specified
+	Variadic      bool // unlimited values can be specfied
+	SupportsStdin bool // can accept stdin as a value
+	Recursive     bool // supports recursive file adding (with '-r' flag)
 	Description   string
 }
 
@@ -36,7 +37,20 @@ func FileArg(name string, required, variadic bool, description string) Argument
 	}
 }
 
+// TODO: modifiers might need a different API?
+//       e.g. passing enum values into arg constructors variadically
+//       (`FileArg("file", ArgRequired, ArgStdin, ArgRecursive)`)
+
 func (a Argument) EnableStdin() Argument {
 	a.SupportsStdin = true
 	return a
 }
+
+func (a Argument) EnableRecursive() Argument {
+	if a.Type != ArgFile {
+		panic("Only ArgFile arguments can enable recursive")
+	}
+
+	a.Recursive = true
+	return a
+}