class Mahout < Formula
  desc "Library to help build scalable machine learning libraries"
  homepage "https://mahout.apache.org/"
  url "https://www.apache.org/dyn/closer.cgi?path=mahout/0.10.0/mahout-distribution-0.10.0.tar.gz"
  sha256 "0f76800f6ff93f47b9ebf794522a6c5a58155eba7233a53863e7486454b96b53"

  head do
    url "https://svn.apache.org/repos/asf/mahout/trunk"
    depends_on "maven" => :build
  end

  depends_on "hadoop"
  depends_on :java

  def install
    if build.head?
      chmod 755, "./bin"
      system "mvn -DskipTests clean install"
    end

    libexec.install "bin"

    if build.head?
      libexec.install Dir["buildtools/target/*.jar"]
      libexec.install Dir["core/target/*.jar"]
      libexec.install Dir["examples/target/*.jar"]
      libexec.install Dir["math/target/*.jar"]
    else
      libexec.install Dir["*.jar"]
    end

    bin.write_exec_script Dir["#{libexec}/bin/*"]
  end

  def caveats; <<-EOS.undent
    Mahout requires JAVA_HOME to be set:
      export JAVA_HOME=$(/usr/libexec/java_home)
    EOS
  end
end