added cassandra 0.6.1

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

Formula/cassandra.rb

@@ -0,0 +1,31 @@
+require 'formula'
+
+class Cassandra <Formula
+  url 'http://apache.mirroring.de/cassandra/0.6.1/apache-cassandra-0.6.1-bin.tar.gz'
+  homepage 'http://cassandra.apache.org'
+  md5 '6aa1764f76e26fbc9d62b59e2f6a9ab4'
+  version '0.6.1'
+
+  def install
+    (var+"lib/cassandra").mkpath
+    (var+"log/cassandra").mkpath
+    (etc+"cassandra").mkpath
+
+    inreplace "conf/storage-conf.xml", "/var/lib/cassandra", "#{var}/lib/cassandra"
+    inreplace "conf/log4j.properties", "/var/log/cassandra", "#{var}/log/cassandra"
+
+    inreplace "bin/cassandra.in.sh" do |s|
+      s.gsub! "cassandra_home=`dirname $0`/..", "cassandra_home=#{prefix}"
+      # Store configs in etc, outside of keg
+      s.gsub! "CASSANDRA_CONF=$cassandra_home/conf", "CASSANDRA_CONF=#{etc}/cassandra"
+      # Jars installed to prefix, no longer in a lib folder
+      s.gsub! "$cassandra_home/lib/*.jar", "$cassandra_home/*.jar"
+    end
+
+    rm Dir["bin/*.bat"]
+
+    (etc+"cassandra").install Dir["conf/*"]
+    prefix.install Dir["*.txt"] + Dir["{bin,interface,javadoc}"]
+    prefix.install Dir["lib/*.jar"]
+  end
+end