{ fetchurl, lib, stdenv, unzip }:

let
  version = "2.9";
  fileVersion = builtins.replaceStrings [ "." ] [ "_" ] version;

  sha256 = {
    x86_64-linux = "sha256-2ZLFM5YcV2Ym38hxU8WMrRDjHDF6edqYohLeM+ASgpk=";
  }.${stdenv.hostPlatform.system} or (throw "system #{stdenv.hostPlatform.system.} is not supported");

  url = {
    x86_64-linux = "https://archive.org/download/kindlegen_linux_2_6_i386_v2_9/kindlegen_linux_2.6_i386_v2_9.tar.gz";
  }.${stdenv.hostPlatform.system} or (throw "system #{stdenv.hostPlatform.system.} is not supported");

in
stdenv.mkDerivation {
  pname = "kindlegen";
  inherit version;

  src = fetchurl {
    inherit url;
    inherit sha256;
  };

  sourceRoot = ".";

  nativeBuildInputs = lib.optional (lib.hasSuffix ".zip" url) unzip;

  installPhase = ''
    mkdir -p $out/bin $out/share/kindlegen/doc
    install -m755 kindlegen $out/bin/kindlegen
    cp -r *.txt *.html docs/* $out/share/kindlegen/doc
  '';

  meta = with lib; {
    description = "Convert documents to .mobi for use with Amazon Kindle";
    homepage = "https://www.amazon.com/gp/feature.html?docId=1000765211";
    license = licenses.unfree;
    maintainers = with maintainers; [ peterhoeg ];
    platforms = [ "x86_64-linux" "i686-linux" "x86_64-darwin" "i686-darwin" "x86_64-cygwin" "i686-cygwin" ];
  };
}