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+use rustyline::DefaultEditor; + +#[derive(Eq, PartialEq)] +enum ShouldContinue { + Yes, + No, +} + +fn command_line() -> Command { + // strip out usage + const PARSER_TEMPLATE: &str = "\ + {all-args} + "; + + // strip out name/version + const APPLET_TEMPLATE: &str = "\ + {about-with-newline}\n\ + {usage-heading}\n {usage}\n\ + \n\ + {all-args}{after-help}\ + "; + + Command::new("explorer") + .multicall(true) + .arg_required_else_help(true) + .subcommand_required(true) + .subcommand_value_name("APPLET") + .subcommand_help_heading("APPLETS") + .help_template(PARSER_TEMPLATE) + .subcommand(Command::new("print").about("Print the board")) + .subcommand( + Command::new("place") + .arg(Arg::new("piece").required(true)) + .arg(Arg::new("square").required(true)), + ) + .subcommand(Command::new("quit").about("Quit the program")) +} + +fn respond(line: &str, pos: &mut Position) -> Result { + let args = shlex::split(line).ok_or("error: Invalid quoting")?; + let matches = command_line() + .try_get_matches_from(args) + .map_err(|e| e.to_string())?; + + match matches.subcommand() { + Some(("print", _matches)) => {} + Some(("quit", _matches)) => { + return Ok(ShouldContinue::No); + } + Some(("place", _matches)) => { + let piece_arg = _matches.get_one::("piece").unwrap(); + let shape = match piece_arg.chars().nth(0) { + Some(c) => Shape::try_from(c).map_err(|_| ()), + None => Err(()), + } + .map_err(|_| "Error: invalid piece specifier")?; + + let square_arg = _matches.get_one::("square").unwrap(); + let square = Square::from_algebraic_str(square_arg) + .map_err(|_| "Error: invalid square specifier")?; + + pos.place_piece(&Piece::new(Color::White, shape), &square) + .map_err(|_| "Error: Unable to place piece")?; + } + Some((name, _matches)) => unimplemented!("{name}"), + None => unreachable!("Subcommand required"), + } + + Ok(ShouldContinue::Yes) +} + +fn main() -> Result<(), String> { + let mut editor = DefaultEditor::new().map_err(|err| format!("Error: {}", err.to_string()))?; + + let mut pos = Position::empty(); + + loop { + let diagram = DiagramFormatter::new(&pos); + println!("{}", diagram); + + let readline = editor.readline("? "); + match readline { + Ok(line) => { + let line = line.trim(); + if line.is_empty() { + continue; + } + + match respond(line, &mut pos) { + Ok(should_continue) => { + if should_continue == ShouldContinue::No { + break; + } + } + Err(message) => println!("{}", message), + } + } + Err(ReadlineError::Interrupted) => { + println!("CTRL-C"); + break; + } + Err(ReadlineError::Eof) => { + println!("CTRL-D"); + break; + } + Err(err) => { + println!("Error: {:?}", err); + break; + } + } + } + + Ok(()) +}