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use clap::error::Error;
use clap::{Arg, ArgAction, 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> {
let mut matches = matches.clone();
Self::from_arg_matches_mut(&mut matches)
}
fn from_arg_matches_mut(matches: &mut ArgMatches) -> Result<Self, Error> {
Ok(Self {
foo: matches.get_flag("foo"),
bar: matches.get_flag("bar"),
quuz: matches.remove_one::<String>("quuz"),
})
}
fn update_from_arg_matches(&mut self, matches: &ArgMatches) -> Result<(), Error> {
let mut matches = matches.clone();
self.update_from_arg_matches_mut(&mut matches)
}
fn update_from_arg_matches_mut(&mut self, matches: &mut ArgMatches) -> Result<(), Error> {
self.foo |= matches.get_flag("foo");
self.bar |= matches.get_flag("bar");
if let Some(quuz) = matches.remove_one::<String>("quuz") {
self.quuz = Some(quuz);
}
Ok(())
}
}
impl Args for CliArgs {
fn augment_args(cmd: Command) -> Command {
cmd.arg(
Arg::new("foo")
.short('f')
.long("foo")
.action(ArgAction::SetTrue),
)
.arg(
Arg::new("bar")
.short('b')
.long("bar")
.action(ArgAction::SetTrue),
)
.arg(
Arg::new("quuz")
.short('q')
.long("quuz")
.action(ArgAction::Set),
)
}
fn augment_args_for_update(cmd: Command) -> Command {
cmd.arg(
Arg::new("foo")
.short('f')
.long("foo")
.action(ArgAction::SetTrue),
)
.arg(
Arg::new("bar")
.short('b')
.long("bar")
.action(ArgAction::SetTrue),
)
.arg(
Arg::new("quuz")
.short('q')
.long("quuz")
.action(ArgAction::Set),
)
}
}
#[derive(Parser, Debug)]
struct Cli {
#[arg(short, long)]
top_level: bool,
#[command(flatten)]
more_args: CliArgs,
}
fn main() {
let args = Cli::parse();
println!("{args:#?}");
}