use std::path::PathBuf; use std::process::exit; use clap::{value_parser, Arg, ArgAction, Command}; fn applet_commands() -> [Command<'static>; 2] { [ Command::new("true").about("does nothing successfully"), Command::new("false").about("does nothing unsuccessfully"), ] } fn main() { let cmd = Command::new(env!("CARGO_CRATE_NAME")) .multicall(true) .subcommand( Command::new("busybox") .arg_required_else_help(true) .subcommand_value_name("APPLET") .subcommand_help_heading("APPLETS") .arg( Arg::new("install") .long("install") .help("Install hardlinks for all subcommands in path") .exclusive(true) .action(ArgAction::Set) .default_missing_value("/usr/local/bin") .value_parser(value_parser!(PathBuf)), ) .subcommands(applet_commands()), ) .subcommands(applet_commands()); let matches = cmd.get_matches(); let mut subcommand = matches.subcommand(); if let Some(("busybox", cmd)) = subcommand { if cmd.contains_id("install") { unimplemented!("Make hardlinks to the executable here"); } subcommand = cmd.subcommand(); } match subcommand { Some(("false", _)) => exit(1), Some(("true", _)) => exit(0), _ => unreachable!("parser should ensure only valid subcommand names are used"), } }