Don’t core dump when given invalid UTF-8 arguments

By parsing OsStrings rather than Strings, it’s the getopts crate that’s doing the UTF-8 checking rather than us, so if one of them isn’t valid, it’ll just fail to parse rather than crash exa.

Also, save a few allocations here and there.

src/bin/main.rs

@@ -1,15 +1,15 @@
 extern crate exa;
 use exa::Exa;
 
-use std::env::args;
+use std::env::args_os;
 use std::io::{stdout, stderr, Write, ErrorKind};
 use std::process::exit;
 
 fn main() {
-    let args: Vec<String> = args().skip(1).collect();
+    let args = args_os().skip(1);
     let mut stdout = stdout();
 
-    match Exa::new(&args, &mut stdout) {
+    match Exa::new(args, &mut stdout) {
         Ok(mut exa) => {
             match exa.run() {
                 Ok(exit_status) => exit(exit_status),

src/exa.rs

@@ -53,8 +53,8 @@ pub struct Exa<'w, W: Write + 'w> {
 }
 
 impl<'w, W: Write + 'w> Exa<'w, W> {
-    pub fn new<S>(args: &[S], writer: &'w mut W) -> Result<Exa<'w, W>, Misfire>
-    where S: AsRef<OsStr> {
+    pub fn new<C>(args: C, writer: &'w mut W) -> Result<Exa<'w, W>, Misfire>
+    where C: IntoIterator, C::Item: AsRef<OsStr> {
         Options::getopts(args).map(move |(options, args)| {
             Exa { options, writer, args }
         })

src/options/mod.rs

@@ -39,10 +39,16 @@ pub struct Options {
 
 impl Options {
 
+    // Even though the arguments go in as OsStrings, they come out
+    // as Strings. Invalid UTF-8 won’t be parsed, but it won’t make
+    // exa core dump either.
+    //
+    // https://github.com/rust-lang-nursery/getopts/pull/29
+
     /// Call getopts on the given slice of command-line strings.
     #[allow(unused_results)]
-    pub fn getopts<S>(args: &[S]) -> Result<(Options, Vec<String>), Misfire>
-    where S: AsRef<OsStr> {
+    pub fn getopts<C>(args: C) -> Result<(Options, Vec<String>), Misfire>
+    where C: IntoIterator, C::Item: AsRef<OsStr> {
         let mut opts = getopts::Options::new();
 
         opts.optflag("v", "version",   "show version of exa");

xtests/run.sh

@@ -72,6 +72,10 @@ COLUMNS=80 $exa $testcases/file-names -R 2>&1 | diff -q - $results/file_names_R
            $exa $testcases/file-names -1 2>&1 | diff -q - $results/file_names_1 || exit 1
            $exa $testcases/file-names -T 2>&1 | diff -q - $results/file_names_T || exit 1
 
+# At least make sure it handles invalid UTF-8 arguments without crashing
+$exa $testcases/file-names/* 2>/dev/null
+
+
 # File types
 $exa $testcases/file-names-exts -1 2>&1 | diff -q - $results/file-names-exts  || exit 1
 $exa $testcases/specials        -l 2>&1 | diff -q - $results/specials         || exit 1