fop(1): bring getopt(3) usage up-to-date

src/fop.rs

@@ -33,25 +33,20 @@ use sysexits::{ EX_DATAERR, EX_IOERR, EX_UNAVAILABLE, EX_USAGE };
 fn main() {
 	let argv = args().collect::<Vec<String>>();
 	let mut d = '\u{1E}'.to_string();
+	let mut index_arg = 0;
+
 	let usage = format!(
 		"Usage: {} [-d delimiter] index command [args...]",
 		argv[0],
 	);
-	let mut index_arg = 0;
-	let mut arg_parser = Parser::new(&argv, "d:");
 
 	while let Some(opt) = argv.getopt("d:") {
-		match opt {
+		match opt.opt() {
-			Ok(o) => {
+			Ok(_) => {
 				/* unwrap because Err(OptError::MissingArg) will be returned if
-				 * o.arg is None */
+				 * opt.arg() is None */
-				let arg = o.arg.clone().unwrap();
+				d = opt.arg().unwrap();
-				let arg_char = arg.chars().collect::<Vec<char>>();
+				index_arg = opt.ind();
-				if arg_char.len() > 1 {
-					eprintln!("{}: {}: Not a character.", argv[0], arg);
-					exit(EX_USAGE);
-				} else { d = arg_char[0]; }
-				index_arg = o.index();
 			},
 			Err(_) => {
 				eprintln!("{}", usage);