1 //! Running this example with --help prints this message:
2 //! -----------------------------------------------------
3 //! structopt 0.3.25
4 //!
5 //! USAGE:
6 //! enum_in_args_with_strum [OPTIONS]
7 //!
8 //! FLAGS:
9 //! -h, --help Prints help information
10 //! -V, --version Prints version information
11 //!
12 //! OPTIONS:
13 //! --format <format> [default: txt] [possible values: txt, md, html]
14 //! -----------------------------------------------------
15
16 use structopt::StructOpt;
17 use strum::{EnumString, EnumVariantNames, VariantNames};
18
19 const DEFAULT: &str = "txt";
20
21 #[derive(StructOpt, Debug)]
22 struct Opt {
23 #[structopt(
24 long,
25 possible_values = Format::VARIANTS,
26 case_insensitive = true,
27 default_value = DEFAULT,
28 )]
29 format: Format,
30 }
31
32 #[derive(EnumString, EnumVariantNames, Debug)]
33 #[strum(serialize_all = "kebab_case")]
34 enum Format {
35 Txt,
36 Md,
37 Html,
38 }
39
main()40 fn main() {
41 println!("{:?}", Opt::from_args());
42 }
43