xflag

At a glance

One function, linked to godoc.

FUNCTIONS
    func ParseToEnd(f *flag.FlagSet, arguments []string) error

Usage

f := flag.NewFlagSet("greet", flag.ContinueOnError)
verbose := f.Bool("verbose", false, "enable verbose output")
name    := f.String("name", "world", "who to greet")

// Keep parsing after positional arguments.
if err := xflag.ParseToEnd(f, os.Args[1:]); err != nil {
    log.Fatal(err)
}

fmt.Println(*verbose, *name, f.Args())

# All three are equivalent.
greet --verbose --name=alice arg1 arg2
greet arg1 --verbose arg2 --name=alice
greet arg1 arg2 --verbose --name=alice

Why this exists

Go stops parsing flags at the first positional argument. Most CLIs allow flags anywhere, so xflag fills that gap without replacing the standard library.

Background: Go issue #4513 and #63138.