homebrew-core/Formula/pig.rb

require 'formula'

class Pig < Formula
  url 'http://www.apache.org/dyn/closer.cgi?path=pig/pig-0.9.1/pig-0.9.1.tar.gz'
  homepage 'http://pig.apache.org/'
  md5 'f9aef698536b67b2966e48d328caf071'

  def patches
    DATA
  end

  def install
    bin.install 'bin/pig'
    prefix.install "pig-#{version}.jar"
    prefix.install "pig-#{version}-withouthadoop.jar"
  end
end

# There's something weird with Pig's launch script, it doesn't find the correct
# path. This patch finds PIG_HOME from the pig binary path's symlink.
__END__
diff -u a/bin/pig b/bin/pig
--- a/bin/pig 2011-09-30 08:55:58.000000000 +1000
+++ b/bin/pig 2011-11-28 11:18:36.000000000 +1100
@@ -55,11 +55,8 @@

 # resolve links - $0 may be a softlink
 this="${BASH_SOURCE-$0}"
-
-# convert relative path to absolute path
-bin=$(cd -P -- "$(dirname -- "$this")">/dev/null && pwd -P)
-script="$(basename -- "$this")"
-this="$bin/$script"
+here=$(dirname $this)
+this="$here"/$(readlink $this)

 # the root of the Pig installation
 export PIG_HOME=`dirname "$this"`/..