nixpkgs/pkgs/by-name/pn/pngout/package.nix

{
  lib,
  stdenv,
  fetchurl,
  unzip,
}:

let
  platforms = {
    aarch64-linux = {
      folder = "aarch64";
      ld-linux = "ld-linux-aarch64.so.1";
    };
    armv7l-linux = {
      folder = "armv7";
      ld-linux = "ld-linux-armhf.so.3";
    };
    i686-linux = {
      folder = "i686";
      ld-linux = "ld-linux.so.2";
    };
    x86_64-darwin = {
      folder = ".";
    };
    x86_64-linux = {
      folder = "amd64";
      ld-linux = "ld-linux-x86-64.so.2";
    };
  };
  platform =
    platforms."${stdenv.hostPlatform.system}"
      or (throw "Unsupported system: ${stdenv.hostPlatform.system}");
  download =
    if stdenv.hostPlatform.isDarwin then
      {
        extension = "macos.zip";
        hash = "sha256-MnL6lH7q/BrACG4fFJNfnvoh0JClVeaJIlX+XIj2aG4=";
      }
    else
      {
        extension = "linux.tar.gz";
        hash = "sha256-rDi7pvDeKQM96GZTjDr6ZDQTGbaVu+OI77xf2egw6Sg=";
      };
in
stdenv.mkDerivation rec {
  pname = "pngout";
  version = "20200115";

  src = fetchurl {
    inherit (download) hash;
    url = "http://static.jonof.id.au/dl/kenutils/pngout-${version}-${download.extension}";
  };

  nativeBuildInputs = lib.optionals stdenv.hostPlatform.isDarwin [ unzip ];

  # pngout is code-signed on Darwin, so don’t alter the binary to avoid breaking the signature.
  dontFixup = stdenv.hostPlatform.isDarwin;

  installPhase =
    ''
      mkdir -p $out/bin
      cp ${platform.folder}/pngout $out/bin
    ''
    + lib.optionalString stdenv.hostPlatform.isLinux ''
      patchelf --set-interpreter ${stdenv.cc.libc}/lib/${platform.ld-linux} $out/bin/pngout
    '';

  meta = {
    description = "Tool that aggressively optimizes the sizes of PNG images";
    sourceProvenance = with lib.sourceTypes; [ binaryNativeCode ];
    license = lib.licenses.unfreeRedistributable;
    homepage = "http://advsys.net/ken/utils.htm";
    platforms = lib.attrNames platforms;
    maintainers = [ lib.maintainers.sander ];
    mainProgram = "pngout";
  };
}