Function FirstStringOf

flags/flags.go:710–730

FirstStringOf returns the value of the first defined flag from the input list. If no defined flags, returns first flag with non-empty default value.

(ctx *cli.Context, flags ...string)

// FirstStringOf returns the value of the first defined flag from the input list.
// If no defined flags, returns first flag with non-empty default value.
func FirstStringOf(ctx *cli.Context, flags ...string) (string, string) {
	// Return first defined flag.
	for _, f := range flags {
		if ctx.IsSet(f) {
			return ctx.String(f), f
		}
	}
	// Return first non-empty, default, flag value.
	for _, f := range flags {
		if val := ctx.String(f); val != "" {
			return val, f
		}
	}

	var name = "<unknown>"
	if len(flags) > 0 {
		name = flags[0]
	}

	return "", name
}