Merge pull request #1499 from dearchap/issue_557

Fix help results inconsistency

command.go

@@ -170,7 +170,7 @@ func (c *Command) Run(ctx *Context) (err error) {
 	}
 
 	if c.Action == nil {
-		c.Action = helpSubcommand.Action
+		c.Action = helpCommand.Action
 	}
 
 	cCtx.Command = c
@@ -284,7 +284,7 @@ func (c *Command) startApp(ctx *Context) error {
 	if c.Action != nil {
 		app.Action = c.Action
 	} else {
-		app.Action = helpSubcommand.Action
+		app.Action = helpCommand.Action
 	}
 	app.OnUsageError = c.OnUsageError
 
@@ -298,7 +298,12 @@ func (c *Command) startApp(ctx *Context) error {
 // VisibleFlagCategories returns a slice containing all the visible flag categories with the flags they contain
 func (c *Command) VisibleFlagCategories() []VisibleFlagCategory {
 	if c.flagCategories == nil {
-		return []VisibleFlagCategory{}
+		c.flagCategories = newFlagCategories()
+		for _, fl := range c.Flags {
+			if cf, ok := fl.(CategorizableFlag); ok {
+				c.flagCategories.AddFlag(cf.GetCategory(), cf)
+			}
+		}
 	}
 	return c.flagCategories.VisibleCategories()
 }