From ad92fe27d4eb2a6731182844918713ee93acc292 Mon Sep 17 00:00:00 2001
From: emma <emma@tebibyte.media>
Date: Thu, 11 Apr 2024 23:37:04 -0600
Subject: [PATCH] fop(1): switch to getopt.rs(3)

---
 src/fop.rs | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/src/fop.rs b/src/fop.rs
index b829602..a56a0a6 100644
--- a/src/fop.rs
+++ b/src/fop.rs
@@ -26,33 +26,43 @@ extern crate getopt;
 extern crate strerror;
 extern crate sysexits;
 
-use getopt::{ Opt, Parser };
+use getopt::GetOpt;
 use strerror::StrError;
 use sysexits::{ EX_DATAERR, EX_IOERR, EX_UNAVAILABLE, EX_USAGE };
 
 fn main() {
 	let argv = args().collect::<Vec<String>>();
 	let mut d = '␞';
-	let mut arg_parser = Parser::new(&argv, "d:");
+	let usage = format!(
+		"Usage: {} [-d delimiter] index command [args...]",
+		argv[0],
+	);
+	let mut index_arg = 0;
 
-	while let Some(opt) = arg_parser.next() {
+	while let Some(opt) = argv.getopt("d:") {
 		match opt {
-			Ok(Opt('d', Some(arg))) => {
+			Ok(o) => {
+				/* unwrap because Err(OptError::MissingArg) will be returned if
+				 * o.arg is None */
+				let arg = o.arg.unwrap();
 				let arg_char = arg.chars().collect::<Vec<char>>();
 				if arg_char.len() > 1 {
 					eprintln!("{}: {}: Not a character.", argv[0], arg);
 					exit(EX_USAGE);
 				} else { d = arg_char[0]; }
+				index_arg = o.ind as usize;
 			},
-			_ => {},
+			Err(_) => {
+				eprintln!("{}", usage);
+				exit(EX_USAGE);
+			}
 		};
 	}
 
-	let index_arg = arg_parser.index();
-	let command_arg = arg_parser.index() + 1;
+	let command_arg = index_arg as usize + 1;
 
 	argv.get(command_arg).unwrap_or_else(|| {
-		eprintln!("Usage: {} [-d delimiter] index command [args...]", argv[0]);
+		eprintln!("{}", usage);
 		exit(EX_USAGE);
 	});