interop_flatten_hand_args/
flatten_hand_args.rs

1use clap::error::Error;
2use clap::{Arg, ArgAction, ArgMatches, Args, Command, FromArgMatches, Parser};
3
4#[derive(Debug)]
5struct CliArgs {
6    foo: bool,
7    bar: bool,
8    quuz: Option<String>,
9}
10
11impl FromArgMatches for CliArgs {
12    fn from_arg_matches(matches: &ArgMatches) -> Result<Self, Error> {
13        let mut matches = matches.clone();
14        Self::from_arg_matches_mut(&mut matches)
15    }
16    fn from_arg_matches_mut(matches: &mut ArgMatches) -> Result<Self, Error> {
17        Ok(Self {
18            foo: matches.get_flag("foo"),
19            bar: matches.get_flag("bar"),
20            quuz: matches.remove_one::<String>("quuz"),
21        })
22    }
23    fn update_from_arg_matches(&mut self, matches: &ArgMatches) -> Result<(), Error> {
24        let mut matches = matches.clone();
25        self.update_from_arg_matches_mut(&mut matches)
26    }
27    fn update_from_arg_matches_mut(&mut self, matches: &mut ArgMatches) -> Result<(), Error> {
28        self.foo |= matches.get_flag("foo");
29        self.bar |= matches.get_flag("bar");
30        if let Some(quuz) = matches.remove_one::<String>("quuz") {
31            self.quuz = Some(quuz);
32        }
33        Ok(())
34    }
35}
36
37impl Args for CliArgs {
38    fn augment_args(cmd: Command) -> Command {
39        cmd.arg(
40            Arg::new("foo")
41                .short('f')
42                .long("foo")
43                .action(ArgAction::SetTrue),
44        )
45        .arg(
46            Arg::new("bar")
47                .short('b')
48                .long("bar")
49                .action(ArgAction::SetTrue),
50        )
51        .arg(
52            Arg::new("quuz")
53                .short('q')
54                .long("quuz")
55                .action(ArgAction::Set),
56        )
57    }
58    fn augment_args_for_update(cmd: Command) -> Command {
59        cmd.arg(
60            Arg::new("foo")
61                .short('f')
62                .long("foo")
63                .action(ArgAction::SetTrue),
64        )
65        .arg(
66            Arg::new("bar")
67                .short('b')
68                .long("bar")
69                .action(ArgAction::SetTrue),
70        )
71        .arg(
72            Arg::new("quuz")
73                .short('q')
74                .long("quuz")
75                .action(ArgAction::Set),
76        )
77    }
78}
79
80#[derive(Parser, Debug)]
81struct Cli {
82    #[arg(short, long)]
83    top_level: bool,
84    #[command(flatten)]
85    more_args: CliArgs,
86}
87
88fn main() {
89    let args = Cli::parse();
90    println!("{args:#?}");
91}
interop_flatten_hand_args/flatten_hand_args.rs

interop_flatten_hand_args/
flatten_hand_args.rs
