require "formula"

class OpengrmNgram < Formula
  homepage "http://www.openfst.org/twiki/bin/view/GRM/NGramLibrary"
  url "http://openfst.cs.nyu.edu/twiki/pub/GRM/NGramDownload/opengrm-ngram-1.2.1.tar.gz"
  sha1 "827286a36b2cbac5bfeecebbf946e2cc0804c1e1"

  depends_on "openfst"

  resource "earnest" do
    url "http://www.openfst.org/twiki/pub/GRM/NGramQuickTour/earnest.txt"
    sha1 "122c72f34a41ecb5e21102724938756fdfe349ec"
  end

  needs :cxx11

  def install
    ENV.cxx11
    system "./configure", "--disable-dependency-tracking", "--prefix=#{prefix}"
    system "make install"
  end

  test do
    resource("earnest").stage do
      fname = "earnest.txt"
      # tests using normalized The Importance of Being Earnest, based on
      # examples from the OpenGRM "NGram quick tour" page...
      system bin/"ngramsymbols", fname, "e.syms"
      system bin/"farcompilestrings", "-symbols=e.syms",
                                      "-keep_symbols=1",
                                      fname, "e.far"
      system bin/"ngramcount", "-order=5", "e.far", "e.cnts"
      system bin/"ngrammake", "e.cnts", "e.mod"
      system bin/"ngramshrink", "-method=relative_entropy", "e.mod", "e.pru"
      system bin/"ngramprint", "--ARPA", "e.mod"
      system bin/"ngraminfo", "e.mod"
    end
  end
end