Add unlink command.

Makefile

@@ -26,6 +26,7 @@ PROGS       := \
   tee \
   true \
   truncate \
+  unlink \
   wc \
   yes \
   hostname \

README.md

@@ -146,7 +146,6 @@ To do
 - uname-uname
 - unexpand
 - uniq (in progress)
-- unlink
 - who
 
 License

unlink/unlink.rs

@@ -0,0 +1,87 @@
+#![crate_id(name="unlink", vers="1.0.0", author="zvms")]
+
+/*
+ * This file is part of the uutils coreutils package.
+ *
+ * (c) Colin Warren <me@zv.ms>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/* last synced with: unlink (GNU coreutils) 8.21 */
+
+#![feature(macro_rules)]
+
+extern crate getopts;
+extern crate libc;
+
+use std::os;
+use std::io;
+use std::io::fs;
+use std::io::print;
+
+#[path = "../common/util.rs"]
+mod util;
+
+static NAME: &'static str = "unlink";
+
+fn main() {
+    let args = os::args();
+    let program = args.get(0).clone();
+    let opts = ~[
+        getopts::optflag("h", "help", "display this help and exit"),
+        getopts::optflag("V", "version", "output version information and exit"),
+    ];
+
+    let matches = match getopts::getopts(args.tail(), opts) {
+        Ok(m) => m,
+        Err(f) => {
+            crash!(1, "invalid options\n{}", f.to_err_msg())
+        }
+    };
+
+    if matches.opt_present("help") {
+        println!("unlink 1.0.0");
+        println!("");
+        println!("Usage:");
+        println!("  {0:s} [FILE]... [OPTION]...", program);
+        println!("");
+        print(getopts::usage("Unlink the file at [FILE].", opts));
+        return;
+    }
+
+    if matches.opt_present("version") {
+        println!("unlink 1.0.0");
+        return;
+    }
+
+    if matches.free.len() == 0 {
+        crash!(1, "missing operand\nTry '{0:s} --help' for more information.", program);
+    } else if matches.free.len() > 1 {
+        crash!(1, "extra operand: '{1}'\nTry '{0:s} --help' for more information.", program, matches.free.get(1));
+    }
+
+    let path = Path::new(matches.free.get(0).clone());
+
+    let result = path.lstat().and_then(|info| {
+        match info.kind {
+            io::TypeFile => Ok(()),
+            io::TypeSymlink => Ok(()),
+            _ => Err(io::IoError {
+                kind: io::OtherIoError,
+                desc: "is not a file or symlink",
+                detail: None
+            })
+        }
+    }).and_then(|_| {
+        fs::unlink(&path)
+    });
+
+    match result {
+        Ok(_) => (),
+        Err(e) => {
+            crash!(1, "cannot unlink '{0}': {1}", path.display(), e.desc);
+        }
+    }
+}