package cliutil import ( "fmt" "gopkg.in/urfave/cli.v2" ) type usageError string func (ue usageError) Error() string { return string(ue) } func UsageError(format string, args ...interface{}) error { if len(args) == 0 { return usageError(format) } else { msg := fmt.Sprintf(format, args...) return usageError(msg) } } // Ensures exit with error code if actionFunc returns an error func ErrorHandler(actionFunc cli.ActionFunc) cli.ActionFunc { return func(ctx *cli.Context) error { err := actionFunc(ctx) if err != nil { if _, ok := err.(usageError); ok { msg := fmt.Sprintf("%s\nSee 'cloudflared %s --help'.", err.Error(), ctx.Command.FullName()) return cli.Exit(msg, -1) } // os.Exits with error code if err is cli.ExitCoder or cli.MultiError cli.HandleExitCoder(err) err = cli.Exit(err.Error(), 1) } return err } }