use std::collections::BTreeMap; use clap::{arg, command, ArgGroup, ArgMatches, Command}; fn main() { let matches = cli().get_matches(); let values = Value::from_matches(&matches); println!("{:#?}", values); } fn cli() -> Command<'static> { command!() .group(ArgGroup::new("tests").multiple(true)) .next_help_heading("TESTS") .args([ arg!(--empty "File is empty and is either a regular file or a directory").group("tests"), arg!(--name "Base of file name (the path with the leading directories removed) matches shell pattern pattern").group("tests"), ]) .group(ArgGroup::new("operators").multiple(true)) .next_help_heading("OPERATORS") .args([ arg!(-o - -or "expr2 is not evaluate if exp1 is true").group("operators"), arg!(-a - -and "Same as `expr1 expr1`").group("operators"), ]) } #[derive(Clone, PartialEq, Eq, Hash, Debug)] pub enum Value { Bool(bool), String(String), } impl Value { pub fn from_matches(matches: &ArgMatches) -> Vec<(clap::Id, Self)> { let mut values = BTreeMap::new(); for id in matches.ids() { if matches.try_get_many::(id.as_str()).is_ok() { // ignore groups continue; } let value_source = matches .value_source(id.as_str()) .expect("id came from matches"); if value_source != clap::parser::ValueSource::CommandLine { // Any other source just gets tacked on at the end (like default values) continue; } if Self::extract::(matches, id, &mut values) { continue; } if Self::extract::(matches, id, &mut values) { continue; } unimplemented!("unknown type for {}: {:?}", id, matches); } values.into_values().collect::>() } fn extract + Send + Sync + 'static>( matches: &ArgMatches, id: &clap::Id, output: &mut BTreeMap, ) -> bool { match matches.try_get_many::(id.as_str()) { Ok(Some(values)) => { for (value, index) in values.zip( matches .indices_of(id.as_str()) .expect("id came from matches"), ) { output.insert(index, (id.clone(), value.clone().into())); } true } Ok(None) => { unreachable!("`ids` only reports what is present") } Err(clap::parser::MatchesError::UnknownArgument { .. }) => { unreachable!("id came from matches") } Err(clap::parser::MatchesError::Downcast { .. }) => false, Err(_) => { unreachable!("id came from matches") } } } } impl From for Value { fn from(other: String) -> Self { Self::String(other) } } impl From for Value { fn from(other: bool) -> Self { Self::Bool(other) } }