feat(command): adding args to use line

Signed-off-by: danmx <daniel.iziourov@elastic.co>

command.go

@@ -216,6 +216,10 @@ type Command struct {
 	// line of a command when printing help or generating docs
 	DisableFlagsInUseLine bool
 
+	// DisableArgsInUseLine will disable the addition of [args] to the usage
+	// line of a command when printing help or generating docs
+	DisableArgsInUseLine bool
+
 	// DisableSuggestions disables the suggestions based on Levenshtein distance
 	// that go along with 'unknown command' messages.
 	DisableSuggestions bool
@@ -1271,6 +1275,9 @@ func (c *Command) UseLine() string {
 	if c.HasAvailableFlags() && !strings.Contains(useline, "[flags]") {
 		useline += " [flags]"
 	}
+	if c.HasAvailableArgs() && !strings.Contains(useline, "[args]") && !c.DisableArgsInUseLine {
+		useline += " [args]"
+	}
 	return useline
 }
 
@@ -1613,6 +1620,11 @@ func (c *Command) HasAvailableInheritedFlags() bool {
 	return c.InheritedFlags().HasAvailableFlags()
 }
 
+// HasAvailableArgs checks if the command has non-nil Args.
+func (c *Command) HasAvailableArgs() bool {
+	return c.Args != nil
+}
+
 // Flag climbs up the command tree looking for matching flag.
 func (c *Command) Flag(name string) (flag *flag.Flag) {
 	flag = c.Flags().Lookup(name)