with import <nixpkgs> {};

let

  mpi4py   = import ./mpi4py.nix;
  coffee   = import ./coffee.nix;
  petsc    = import ./petsc.nix;
  petsc4py = import ./petsc4py.nix;

in

  python27Packages.buildPythonPackage rec {
    version = "98aab7bbbab2945317c1b9ecf5885652cf20e709";
    name = "PyOP2-${version}";

    src = fetchFromGitHub {
      owner = "OP2";
      repo = "PyOP2";
      rev = "${version}";
      sha256 = "167yl4vmw8r9pbn7issjvpflhisjnn42dnw6rfz6bp1rw9v4n4md";
    };

    buildInputs = [
      openmpi
      python27Packages.cython
      python27Packages.pytest
      python27Packages.flake8
      python27Packages.pycparser
      petsc
    ];

    propagatedBuildInputs = [
      python27Packages.six
      python27Packages.numpy
      python27Packages.decorator
      mpi4py
      coffee
      petsc4py
    ];

    postPatch = ''
      sed -i -e 's|self\._cc = os\.environ\.get(ccenv, cc)|self._cc = '\'"$(type -p mpicxx)"\''' if cpp else '\'"$(type -p mpicc)"\'''|' pyop2/compilation.py
      sed -i -e 's|self\._ld = os\.environ\.get('\'''LDSHARED'\''', ld)|self._ld = None|' pyop2/compilation.py
      sed -i -e 's|os\.environ\['\'''PETSC_DIR'\'''\]|'\'''${petsc}'\'''|' pyop2/utils.py
    '';

    meta = {
      homepage = "http://op2.github.io/PyOP2/";
      description = "Framework for performance-portable parallel computations on unstructured meshes.";
      license = licenses.bsd3;
    };
  }