simple pwd implementation

Makefile

@@ -14,6 +14,7 @@ EXES        := \
   env \
   false \
   printenv \
+  pwd \
   true \
   wc \
   whoami \

README.md

@@ -98,7 +98,6 @@ To do
 - printf
 - prog-fprintf
 - ptx
-- pwd
 - readlink
 - realpath
 - relpath

pwd/pwd.rs

@@ -0,0 +1,51 @@
+#[link(name="pwd", vers="1.0.0", author="Heather Cynede")];
+
+/*
+ * This file is part of the uutils coreutils package.
+ *
+ * (c) Derek Chiang <derekchiang93@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+extern mod extra;
+
+use std::os;
+use std::io::stderr;
+use extra::getopts::groups;
+
+static VERSION: &'static str = "1.0.0";
+
+fn main() {
+    let args = os::args();
+    let program = args[0].clone();
+    let opts = ~[
+        groups::optflag("", "help", "display this help and exit"),
+        groups::optflag("", "version", "output version information and exit"),
+    ];
+
+    let matches = match groups::getopts(args.tail(), opts) {
+        Ok(m) => m,
+        Err(f) => {
+            writeln!(&mut stderr() as &mut Writer,
+                "Invalid options\n{}", f.to_err_msg());
+            os::set_exit_status(1);
+            return
+        }  
+    };
+
+    if matches.opt_present("help") {
+        println!("pwd {}", VERSION);
+        println("");
+        println("Usage:");
+        println!("  {0:s} [OPTION] NAME...", program);
+        println("");
+        print(groups::usage("Print the full filename of the current working directory.", opts));
+    } else if matches.opt_present("version") {
+        return println("pwd version: " + VERSION);
+    } else {
+        let cwd = std::os::getcwd();
+        println!("{}", cwd.display());
+    }
+}