add an npm formula

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/npm.rb

@@ -0,0 +1,36 @@
+require 'formula'
+
+class Npm <Formula
+  url 'http://github.com/isaacs/npm/tarball/v0.1.13'
+  head 'git://github.com/isaacs/npm.git'
+  homepage 'http://github.com/isaacs/npm'
+  md5 '5a7f97880693fbb72996d30c4aa8308a'
+
+  depends_on 'node'
+
+  def install
+    # install all the required libs in libexec
+    libexec.install Dir["*"]
+
+    # install man pages
+    man1.mkpath
+    ln_s libexec+'man/npm.1', man1+'npm.1'
+
+    # install the wrapper executable
+    (bin+"npm").write executable
+  end
+
+  def caveats
+    <<-EOS.undent
+      npm is still under heavy development.
+      Hopefully this package will help keep people up to date.
+    EOS
+  end
+
+  def executable
+    <<-EOS
+#!/bin/sh
+exec "#{libexec}/cli.js" "$@"
+    EOS
+  end
+end