stringmapflag

Overview ¶

Package stringmapflag provides a flag.Value that, when parsed, augments a map[string]string with the supplied parameter. The parameter is expressed as a key[=value] option.

Example ¶

Assuming the flag option, "opt", is bound to a stringmapflag.Value, and the following arguments are parsed:

-opt foo=bar
-opt baz

The resulting map would be equivalent to: map[string]string {"foo": "bar", "baz": ""}

v := new(Value)
fs := flag.NewFlagSet("test", flag.ContinueOnError)
fs.Var(v, "option", "Appends a key[=value] option.")

// Simulate user input.
if err := fs.Parse([]string{
	"-option", "foo=bar",
	"-option", "baz",
}); err != nil {
	panic(err)
}

m, _ := json.MarshalIndent(v, "", "  ")
fmt.Println("Parsed options:", string(m))

Output:

Parsed options: {
  "baz": "",
  "foo": "bar"
}