{ lib, fetchurl, buildDotnetPackage, substituteAll, makeWrapper, makeDesktopItem,
  unzip, icoutils, gtk2, xorg, xdotool, xsel, coreutils, unixtools, glib, plugins ? [] }:
let
  inherit (builtins) add length readFile replaceStrings unsafeDiscardStringContext toString map;
in buildDotnetPackage rec {
  pname = "keepass";
  version = "2.49";

  src = fetchurl {
    url = "mirror://sourceforge/keepass/KeePass-${version}-Source.zip";
    sha256 = "sha256-1hg4bRuQSG+UzEQGeQcSURTmTxt5ITGQqfg0IS7RWt0=";
  };

  sourceRoot = ".";

  nativeBuildInputs = [ makeWrapper unzip ];
  buildInputs = [ icoutils ];

  patches = [
    (substituteAll {
      src = ./fix-paths.patch;
      xsel = "${xsel}/bin/xsel";
      xprop = "${xorg.xprop}/bin/xprop";
      xdotool = "${xdotool}/bin/xdotool";
      uname = "${coreutils}/bin/uname";
      whereis = "${unixtools.whereis}/bin/whereis";
      gsettings = "${glib}/bin/gsettings";
    })
  ];

  # KeePass looks for plugins in under directory in which KeePass.exe is
  # located. It follows symlinks where looking for that directory, so
  # buildEnv is not enough to bring KeePass and plugins together.
  #
  # This derivation patches KeePass to search for plugins in specified
  # plugin derivations in the Nix store and nowhere else.
  pluginLoadPathsPatch =
    let outputLc = toString (add 7 (length plugins));
        patchTemplate = readFile ./keepass-plugins.patch;
        loadTemplate  = readFile ./keepass-plugins-load.patch;
        loads =
          lib.concatStrings
            (map
              (p: replaceStrings ["$PATH$"] [ (unsafeDiscardStringContext (toString p)) ] loadTemplate)
              plugins);
    in replaceStrings ["$OUTPUT_LC$" "$DO_LOADS$"] [outputLc loads] patchTemplate;

  passAsFile = [ "pluginLoadPathsPatch" ];
  postPatch = ''
    sed -i 's/\r*$//' KeePass/Forms/MainForm.cs
    patch -p1 <$pluginLoadPathsPatchPath
  '';

  preConfigure = ''
    rm -rvf Build/*
    find . -name "*.sln" -print -exec sed -i 's/Format Version 10.00/Format Version 11.00/g' {} \;
    find . -name "*.csproj" -print -exec sed -i '
      s#ToolsVersion="3.5"#ToolsVersion="4.0"#g
      s#<TargetFrameworkVersion>.*</TargetFrameworkVersion>##g
      s#<PropertyGroup>#<PropertyGroup><TargetFrameworkVersion>v4.5</TargetFrameworkVersion>#g
      s#<SignAssembly>.*$#<SignAssembly>false</SignAssembly>#g
      s#<PostBuildEvent>.*sgen.exe.*$##
    ' {} \;
  '';

  desktopItem = makeDesktopItem {
    name = "keepass";
    exec = "keepass";
    comment = "Password manager";
    icon = "keepass";
    desktopName = "Keepass";
    genericName = "Password manager";
    categories = [ "Utility" ];
    mimeTypes = [ "application/x-keepass2" ];
  };

  outputFiles = [
    "Build/KeePass/Release/*"
    "Build/KeePassLib/Release/*"
    "Ext/KeePass.config.xml" # contains <PreferUserConfiguration>true</PreferUserConfiguration>
  ];
  dllFiles = [ "KeePassLib.dll" ];
  exeFiles = [ "KeePass.exe" ];

  # plgx plugin like keefox requires mono to compile at runtime
  # after loading. It is brought into plugins bin/ directory using
  # buildEnv in the plugin derivation. Wrapper below makes sure it
  # is found and does not pollute output path.
  binPaths = lib.concatStringsSep ":" (map (x: x + "/bin") plugins);

  dynlibPath = lib.makeLibraryPath [ gtk2 ];

  postInstall =
  let
    extractFDeskIcons = ./extractWinRscIconsToStdFreeDesktopDir.sh;
  in
  ''
    mkdir -p "$out/share/applications"
    cp ${desktopItem}/share/applications/* $out/share/applications
    wrapProgram $out/bin/keepass \
      --prefix PATH : "$binPaths" \
      --prefix LD_LIBRARY_PATH : "$dynlibPath"

    ${extractFDeskIcons} \
      "./Translation/TrlUtil/Resources/KeePass.ico" \
      '[^\.]+_[0-9]+_([0-9]+x[0-9]+)x[0-9]+\.png' \
      '\1' \
      '([^\.]+).+' \
      'keepass' \
      "$out" \
      "./tmp"
  '';

  meta = {
    description = "GUI password manager with strong cryptography";
    homepage = "http://www.keepass.info/";
    maintainers = with lib.maintainers; [ amorsillo obadz ];
    platforms = with lib.platforms; all;
    license = lib.licenses.gpl2;
  };
}