New formula: NaCl 20110221

Closes Homebrew/homebrew#7934.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Formula/nacl.rb

@@ -0,0 +1,35 @@
+require 'formula'
+
+class Nacl < Formula
+  url 'http://hyperelliptic.org/nacl/nacl-20110221.tar.bz2'
+  homepage 'http://nacl.cace-project.eu'
+  md5 '7efb5715561c3d10dafd3fa97b4f2d20'
+
+  def install
+    system "./do" # This takes a while since it builds *everything*
+
+    # NaCL has an odd compilation model (software by djb, who'da thunk it?)
+    # and installs the resulting binaries in a directory like:
+    #    <nacl source>/build/<hostname>/lib/<arch>/libnacl.a
+    #    <nacl source>/build/<hostname>/include/<arch>/crypto_box.h
+    # etc. Each of these is optimized for the specific hardware it's
+    # compiled on.
+    #
+    # It also builds both x86 and x86_64 copies if your compiler can
+    # handle it. Here we only install one copy, based on if you're a
+    # 64bit system or not. A --universal could come later though I guess.
+    archstr  = Hardware.is_64_bit? ? "amd64" : "x86"
+    hoststr  = `hostname | sed 's/\\..*//' | tr -cd '[a-z][A-Z][0-9]'`.strip
+
+    # Don't include cpucycles.h
+    include.install Dir["build/#{hoststr}/include/#{archstr}/crypto_*.h"]
+    include.install "build/#{hoststr}/include/#{archstr}/randombytes.h"
+
+    # Add randombytes.o to the libnacl.a archive - I have no idea why it's separated,
+    # but plenty of the key generation routines depend on it. Users shouldn't have to
+    # know this.
+    nacl_libdir = "build/#{hoststr}/lib/#{archstr}"
+    system "ar -r #{nacl_libdir}/libnacl.a #{nacl_libdir}/randombytes.o"
+    lib.install "#{nacl_libdir}/libnacl.a"
+  end
+end