Makefile, fop(1): added argument parsing and -d option

src/fop.rs

@@ -18,33 +18,54 @@
 
 use std::{
 	env::args,
-	io::{ stdin, Write },
+	io::{ Read, stdin, Write },
 	process::{ Command, exit, Stdio },
 };
 
 extern crate sysexits;
+extern crate getopt;
+
+use getopt::{ Opt, Parser };
 use sysexits::{ EX_DATAERR, EX_USAGE };
 
 fn main() {
 	let argv = args().collect::<Vec<String>>();
+	let mut d = '␞';
+	let mut arg_parser = Parser::new(&argv, "d:");
 
-	argv.get(2).unwrap_or_else(|| {
+	while let Some(opt) = arg_parser.next() {
+		match opt {
+			Ok(Opt('d', Some(arg))) => {
+				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]; }
+			},
+			_ => {},
+		};
+	}
+
+	let index_arg = arg_parser.index();
+	let command_arg = arg_parser.index() + 1;
+
+	argv.get(command_arg).unwrap_or_else(|| {
 		eprintln!("Usage: {} index command [args...]", argv[0]);
 		exit(EX_USAGE);
 	});
 
-	let index = argv[1].parse::<usize>().unwrap_or_else(|_| {
+	let index = argv[index_arg].parse::<usize>().unwrap_or_else(|_| {
 		eprintln!("{}: {}: Not an integer.", argv[0], argv[1]);
 		exit(EX_DATAERR);
 	});
 
 	let mut buf = String::new();
-	stdin().read_line(&mut buf).unwrap();
-	let mut fields = buf.split('␞').collect::<Vec<&str>>();
+	stdin().read_to_string(&mut buf).unwrap();
+	let mut fields = buf.split(d).collect::<Vec<&str>>();
 
-	let opts = argv.iter().clone().skip(3).collect::<Vec<&String>>();
+	let opts = argv.iter().clone().skip(command_arg + 1).collect::<Vec<&String>>();
 
-	let mut spawned = Command::new(argv.get(2).unwrap())
+	let mut spawned = Command::new(argv.get(command_arg).unwrap())
 		.args(opts)
 		.stdin(Stdio::piped())
 		.stdout(Stdio::piped())
@@ -71,5 +92,5 @@ fn main() {
 
 	fields[index] = &new_field;
 
-	print!("{}", fields.join("␞"));
+	print!("{}", fields.join(&d.to_string()));
 }