feat(open): added 'open' program

Which uses the `open` library to open any path or url.

Cargo.toml

@@ -8,3 +8,7 @@ description = "Open a path or URL using the program configured on the system"
 repository = "https://github.com/Byron/open-rs"
 keywords = ["open", "xdg-open", "start", "launch"]
 documentation = "http://byron.github.io/open-rs"
+
+[[bin]]
+test = false
+name = "open"

src/lib.rs

@@ -38,16 +38,10 @@ pub fn that(path: &str) -> io::Result<ExitStatus> {
 
 #[cfg(target_os = "windows")]
 pub fn that(path: &str) -> io::Result<ExitStatus> {
-    match Command::new("cmd").arg("/C").arg("start").arg(path).spawn() {
-        Ok(mut child) => child.wait(),
-        Err(err) => Err(err),
-    }
+    try!(Command::new("cmd").arg("/C").arg("start").arg(path).spawn()).wait()
 }
 
 #[cfg(target_os = "macos")]
 pub fn that(path: &str) -> io::Result<ExitStatus> {
-    match Command::new("open").arg(path).spawn() {
-        Ok(mut child) => child.wait(),
-        Err(err) => Err(err),
-    }
+    try!(Command::new("open").arg(path).spawn()).wait()
 }

src/main.rs

@@ -0,0 +1,21 @@
+extern crate open;
+
+use std::io::{stderr, Write};
+use std::env;
+use std::process;
+
+fn main() {
+    let path_or_url = 
+        match env::args().skip(1).next() {
+            Some(arg) => arg,
+            None => {
+                writeln!(stderr(), "usage: open <path-or-url>");
+                process::exit(1);
+            }
+        };
+
+    if let Err(err) = open::that(&path_or_url) {
+        writeln!(stderr(), "An error occourred when opening '{}': {}", path_or_url, err);
+        process::exit(3);
+    }
+}