sc3plugins_default.nix

self: super:
let
  supercollider = super.libsForQt5.callPackage ../supercollider/pkg.nix { sc3plugins = null; };
  sc3plugins =
  super.callPackage ./pkg.nix { inherit supercollider; };
  supercolliderMeta = rec {
    pname = "supercollider";
    version = "3.11.0";

    src = super.fetchurl {
      url =
      "https://github.com/supercollider/supercollider/releases/download/Version-${version}/SuperCollider-${version}-Source.tar.bz2";
      sha256 = "0l5j7sqrjlm85ql91ybcrvdykfkkwfqd7w3m4llbymw720r2ln9p";
    };
  };

in { inherit sc3plugins supercolliderMeta; }

sc3plugins_pkg.nix

# a simple package def to build sc3plugins.nix
# ./overlays/sc3plugins/pkg.nix
{ stdenv
, cmake
, supercollider
, fftw
, libsndfile
, fetchgit
  }:
let name = "sc3plugins";
in stdenv.mkDerivation rec {

  inherit name;

  # https://github.com/supercollider/sc3-plugins/commit/7d08fab319198f27a5368307d0e9833c41b8053b
  # date = "2020-06-05T09=30=19-07:00";
  src = fetchgit {
    url = "git@github.com:supercollider/sc3-plugins.git";
    rev = "7d08fab319198f27a5368307d0e9833c41b8053b";
    sha256 = "0qxn1dx9ccb5bkxx0mj2nxh5iqvk3xcx23rclqbc3kxv6gn41rwl";
    fetchSubmodules = true;
  };

  buildInputs = [ cmake supercollider fftw libsndfile ];

  enableParallelBuilding = true;

  cmakeFlags = [
    "-DSUPERNOVA=ON"
    "-DSC_PATH=${supercollider}/include/SuperCollider"
    "-DFFTW3F_LIBRARY=${fftw}/lib/"
  ];
  
  buildPhase = ''
    cmake .
    cmake --build . --config Release -j 32
    cmake --build . --config Release --target install -j 32
  '';
  
  postInstall = ''
  echo "I am here:"
  pwd 
  ls -a  
  echo "outPath:"
  echo "$outPath" 
  echo "things at outpath:"
  ls -a $outPath/
  echo "out:"
  echo "$out"
  echo "things at out:"
  ls -a $out/
  '';

}

supercollider_default.nix

# the overlay for supercollider assumes that sc3plugins is present in super.
self: super: 
let 
  mkDerivation = super.stdenv.mkDerivation;
  # the package definition of supercollider now also expects the sc3plugins argument. 
  supercollider = super.libsForQt5.callPackage ./pkg.nix { useSCEL = true;
                                                         };
in { inherit supercollider; }

supercollider_pkg.nix

# copy pasted derivation https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/interpreters/supercollider/default.nix
{ stdenv, mkDerivation, fetchurl, cmake, pkgconfig, alsaLib, libjack2
, libsndfile, fftw, curl, gcc, libXt, qtbase, qttools, qtwebengine, readline
, qtwebsockets, useSCEL ? false, emacs
# we've only added the plugins here.
, sc3plugins ? null, supercolliderMeta }:

let optional = stdenv.lib.optional;

in mkDerivation {

  inherit (supercolliderMeta) pname version src;

  hardeningDisable = [ "stackprotector" ];

  cmakeFlags = [ "-DSC_WII=OFF" "-DSC_EL=${if useSCEL then "ON" else "OFF"}" ];

  nativeBuildInputs = [ cmake pkgconfig qttools ];

  enableParallelBuilding = true;

  buildInputs = [
    gcc
    libjack2
    libsndfile
    fftw
    curl
    libXt
    qtbase
    qtwebengine
    qtwebsockets
    readline
  ] ++ optional (!stdenv.isDarwin) alsaLib ++ optional useSCEL emacs;

  meta = with stdenv.lib; {
    description = "Programming language for real time audio synthesis";
    homepage = "https://supercollider.github.io";
    maintainers = with maintainers; [ mrmebelman ];
    license = licenses.gpl3;
    platforms = [ "x686-linux" "x86_64-linux" ];
  };

  postFixup = if (builtins.isNull sc3plugins) then
    ""
  else ''
    echo "I am here:"
    pwd 
    ls -a  
    echo "outPath:"
    echo "$outPath" 
    echo "things at outpath:"
    ls -a $outPath/
    echo "out:"
    echo "$out"
    echo "things at out:"
    ls -a $out/
    echo "Copying sc3plugins to the extensions dir: $out/share/SuperCollider/Extensions"
    cp -r ${sc3plugins}/share/SuperCollider/Extensions/SC3plugins $out/share/SuperCollider/Extensions
  '';

}