Add clean slony

Library/Formula/slony.rb

@@ -0,0 +1,38 @@
+require 'formula'
+
+class PostgresqlInstalled < Requirement
+  def message; <<-EOS.undent
+    PostgresQL is required to install.
+
+    You can install this with:
+      brew install postgresql
+
+    Or you can use an official installer from:
+      http://www.postgresql.org/
+    EOS
+  end
+  def satisfied?
+    which 'pg_config'
+  end
+  def fatal?
+    true
+  end
+end
+
+class Slony < Formula
+  homepage 'http://slony.info/'
+  url 'http://slony.info/downloads/2.1/source/slony1-2.1.2.tar.bz2'
+  sha1 '47449fbc742a25eefdab088ab650973416bccb53'
+
+  depends_on PostgresqlInstalled.new
+
+  def install
+    system "./configure", "--disable-debug",
+                          "--prefix=#{prefix}"
+    system "make install"
+  end
+
+  def test
+    system "slon", "-v"
+  end
+end