kind of working

Cargo.lock

@@ -20,9 +20,9 @@ dependencies = [
 
 [[package]]
 name = "arg-derive"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f5f4f6d38dfe8c7ddd11686611d41897abd43db81e28d3cfe8903d78ee5cb06b"
+checksum = "8b3d15a8d79dbe95cc2742d3e4394789b3ac3de3909a058ae728d1fc864d1b54"
 dependencies = [
  "quote",
  "syn",

arg/Cargo.lock

@@ -12,8 +12,7 @@ dependencies = [
 [[package]]
 name = "arg"
 version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+source = "git+https://github.com/DoumanAsh/arg.rs?branch=ignore_single_dash#14342e3fa59795345005bd21cd5f86a437bc0b10"
-checksum = "ae60fcba735ceff2193950be268184f45271dd9e9c0823e6d1e9c5d1070caf81"
 dependencies = [
  "arg-derive",
 ]
@@ -21,8 +20,7 @@ dependencies = [
 [[package]]
 name = "arg-derive"
 version = "0.3.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+source = "git+https://github.com/DoumanAsh/arg.rs?branch=ignore_single_dash#14342e3fa59795345005bd21cd5f86a437bc0b10"
-checksum = "f5f4f6d38dfe8c7ddd11686611d41897abd43db81e28d3cfe8903d78ee5cb06b"
 dependencies = [
  "quote",
  "syn",

src/cat.rs

@@ -20,8 +20,8 @@
 use std::env;
 use std::fs::{File, read_to_string};
 use std::io;
-use std::io::{ BufRead, Write };
+use std::io::{ Read, Write };
-use std::os::unix::io::FromRawFd;
+use std::str;
 
 use arg::Args;
 
@@ -51,15 +51,18 @@ fn main() -> ExitCode {
 
   for path in args.paths {
     if path == "-" {
-      loop {
+      let mut bytes: Vec<u8> = Vec::new();
-        match io::stdin().lock().read_line(&mut output) {
+      match io::stdin().lock().read_to_end(&mut bytes) {
-          Ok(EOF) => if EOF == 0 { break },
+        Ok(EOF) => {
-          Err(_) => {
+          for byte in &bytes {
-            eprintln!("Usage: {} [options...] [files...]", &argv0);
+            output.push_str(str::from_utf8(&[byte.to_owned()]).unwrap());
-            return ExitCode::Usage;
+          }
-          },
+        },
-        };
+        Err(_) => {
-      }
+          eprintln!("Usage: {} [options...] [files...]", &argv0);
+          return ExitCode::Usage;
+        },
+      };
     } else {
       match read_to_string(&path) {
         Ok(contents) => { output.push_str(&contents) },