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use clap::error::Error;
use clap::{Arg, ArgMatches, Args, Command, FromArgMatches, Parser};
#[derive(Debug)]
struct CliArgs {
foo: bool,
bar: bool,
quuz: Option<String>,
}
impl FromArgMatches for CliArgs {
fn from_arg_matches(matches: &ArgMatches) -> Result<Self, Error> {
Ok(Self {
foo: matches.is_present("foo"),
bar: matches.is_present("bar"),
quuz: matches.value_of("quuz").map(|quuz| quuz.to_owned()),
})
}
fn update_from_arg_matches(&mut self, matches: &ArgMatches) -> Result<(), Error> {
self.foo |= matches.is_present("foo");
self.bar |= matches.is_present("bar");
if let Some(quuz) = matches.value_of("quuz") {
self.quuz = Some(quuz.to_owned());
}
Ok(())
}
}
impl Args for CliArgs {
fn augment_args(cmd: Command<'_>) -> Command<'_> {
cmd.arg(Arg::new("foo").short('f').long("foo"))
.arg(Arg::new("bar").short('b').long("bar"))
.arg(Arg::new("quuz").short('q').long("quuz").takes_value(true))
}
fn augment_args_for_update(cmd: Command<'_>) -> Command<'_> {
cmd.arg(Arg::new("foo").short('f').long("foo"))
.arg(Arg::new("bar").short('b').long("bar"))
.arg(Arg::new("quuz").short('q').long("quuz").takes_value(true))
}
}
#[derive(Parser, Debug)]
struct Cli {
#[clap(short, long)]
top_level: bool,
#[clap(flatten)]
more_args: CliArgs,
}
fn main() {
let args = Cli::parse();
println!("{:#?}", args);
}
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