add nproc

Makefile

@@ -56,6 +56,7 @@ PROGS       := \
   mkdir \
   mv \
   nl \
+  nproc \
   paste \
   printenv \
   pwd \

README.md

@@ -144,7 +144,6 @@ To do
 - mktemp
 - mv
 - nice
-- nproc
 - numfmt
 - od
 - pathchk

src/nproc/nproc.rs

@@ -0,0 +1,51 @@
+#![crate_name = "nproc"]
+
+/*
+ * This file is part of the uutils coreutils package.
+ *
+ * (c) Michael Gehring <mg@ebfe.org>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+extern crate getopts;
+
+use std::os;
+
+static NAME : &'static str = "nproc";
+static VERSION : &'static str = "0.0.0";
+
+pub fn uumain(args: Vec<String>) -> int {
+    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(err) => fail!("{}", err),
+    };
+
+    if matches.opt_present("version") {
+        println!("{} {}", NAME, VERSION);
+        return 0;
+    }
+
+    if matches.opt_present("help") {
+        println!("{} {}", NAME, VERSION);
+        println!("");
+        println!("Usage:");
+        println!("  {} [OPTIONS] NAME...", NAME);
+        println!("");
+        print!("{}", getopts::usage("Print the number of cores available.", opts.as_slice()).as_slice());
+        if matches.free.is_empty() {
+            return 1;
+        }
+        return 0;
+    }
+
+    println!("{}", os::num_cpus());
+
+    return 0
+}