lz4 r114 (new formula)

[LZ4][wiki] is a fast compression algorithm belonging to the LZ77
family. It is used among others in the Linux kernel, Hadoop and BSD
implementation of ZFS.

The [lz4][proj] project consists of a library and a command line tool
for LZ4 (de)compression.

[wiki]: https://en.wikipedia.org/wiki/LZ4_%28compression_algorithm%29
[proj]: http://code.google.com/p/lz4/

Formula/lz4.rb

@@ -0,0 +1,29 @@
+require "formula"
+
+class Lz4 < Formula
+  homepage "http://code.google.com/p/lz4/"
+  url "https://dl.dropboxusercontent.com/u/59565338/LZ4/lz4-r114.tar.gz"
+  sha1 "7b6c4c3b01edbb60e4c07657c3c41e8b5e95770e"
+  version "r114"
+
+  def install
+    # OS X Makefile incompatibility reported to upstream in
+    # https://code.google.com/p/lz4/issues/detail?id=115
+    inreplace "Makefile", /-Wl,-soname=[^ ]+/, ""
+    inreplace "Makefile", /\.so/, ".dylib"
+    system "make", "install", "PREFIX=#{prefix}"
+    # Naming of shared libraries reported to upstream in
+    # https://code.google.com/p/lz4/issues/detail?id=122
+    mv lib/"liblz4.dylib.1", lib/"liblz4.1.dylib"
+    mv lib/"liblz4.dylib.1.0.0", lib/"liblz4.1.0.0.dylib"
+  end
+
+  test do
+    input = "testing compression and decompression"
+    input_file = testpath/"in"
+    input_file.write input
+    output_file = testpath/"out"
+    system "sh", "-c", "cat #{input_file} | lz4 | lz4 -d > #{output_file}"
+    output_file.read == input
+  end
+end