Merge branch 'add-flag-category-support' of ssh://github.com/michaeljs1990/cli into michaeljs1990-add-flag-category-support

command.go

@@ -39,6 +39,8 @@ type Command struct {
 	Subcommands []*Command
 	// List of flags to parse
 	Flags []Flag
+	// List of all flag categories
+	FlagCategories FlagCategories
 	// Treat all flags as normal arguments if true
 	SkipFlagParsing bool
 	// Boolean to hide built-in help command and help flag
@@ -280,6 +282,11 @@ func (c *Command) startApp(ctx *Context) error {
 	return app.RunAsSubcommand(ctx)
 }
 
+// Categories returns a slice containing all the categories with the commands they contain
+func (c Command) VisibleFlagCategories() FlagCategories {
+	return c.FlagCategories
+}
+
 // VisibleFlags returns a slice of the Flags with Hidden=false
 func (c *Command) VisibleFlags() []Flag {
 	return visibleFlags(c.Flags)