add back NixOS flake files

flake.nix

@@ -33,6 +33,7 @@
         type = "app";
         program = "${self.packages.${system}.schildichat-desktop}/bin/schildichat-desktop";
       };
+
       schildichat-desktop-wayland = {
         type = "app";
         program = "${self.packages.${system}.schildichat-desktop-wayland}/bin/schildichat-desktop";

nix/overlay.nix

@@ -0,0 +1,20 @@
+final: prev: {
+  # ignore node_modules and some not needed files
+  cleanSource = src: with final.lib; cleanSourceWith {
+    filter = name: type: cleanSourceFilter name type
+      && !(hasInfix "/node_modules/" name)
+      && !(hasInfix "/nix/" name && hasSuffix ".nix" name);
+
+    inherit src;
+  };
+
+  schildichat-web = final.callPackage ./schildichat-web.nix {};
+  schildichat-desktop = final.callPackage ./schildichat-desktop.nix {
+    inherit (final.darwin.apple_sdk.frameworks) Security AppKit CoreServices;
+  };
+
+  schildichat-desktop-wayland = final.callPackage ./schildichat-desktop.nix {
+    inherit (final.darwin.apple_sdk.frameworks) Security AppKit CoreServices;
+    useWayland = true;
+  };
+}

nix/schildichat-desktop.nix

@@ -0,0 +1,66 @@
+{ 
+    lib, stdenv, fetchFromGitHub, 
+    makeWrapper, makeDesktopItem, mkYarnPackage, 
+    electron, element-desktop, schildichat-web, 
+    callPackage, Security, AppKit, CoreServices, 
+    useWayland ? false, cleanSource, 
+    schildichat-desktop-src ? ../. 
+}:
+
+let
+  packageJSON = schildichat-desktop-src + "/element-desktop/package.json";
+  yarnLock = schildichat-desktop-src + "/element-desktop/yarn.lock";
+  version = builtins.fromJSON (builtins.readFile packageJSON).version;
+  electron_exec = if stdenv.isDarwin then "${electron}/Applications/Electron.app/Contents/MacOS/Electron" else "${electron}/bin/electron";
+in mkYarnPackage {
+  pname = "schildichat-desktop";
+  inherit version packageJSON;
+  src = cleanSource (schildichat-desktop-src + "/element-desktop");
+  nativeBuildInputs = [ makeWrapper ];
+  inherit (element-desktop) seshat keytar;
+
+  buildPhase = ''
+    export HOME=$(mktemp -d)
+    pushd deps/schildichat-desktop/
+    npx tsc
+    yarn run i18n
+    node ./scripts/copy-res.js
+    popd
+    rm -rf node_modules/matrix-seshat node_modules/keytar
+    ln -s $keytar node_modules/keytar
+    ln -s $seshat node_modules/matrix-seshat
+  '';
+
+  installPhase = ''
+    mkdir -p "$out/share/element"
+    ln -s '${schildichat-web}' "$out/share/element/webapp"
+    cp -r './deps/schildichat-desktop' "$out/share/element/electron"
+    cp -r './deps/schildichat-desktop/res/img' "$out/share/element"
+    rm "$out/share/element/electron/node_modules"
+    cp -r './node_modules' "$out/share/element/electron"
+    cp $out/share/element/electron/lib/i18n/strings/en_EN.json $out/share/element/electron/lib/i18n/strings/en-us.json
+    ln -s $out/share/element/electron/lib/i18n/strings/en{-us,}.json
+
+    for icon in $out/share/element/electron/build/icons/*.png; do
+      mkdir -p "$out/share/icons/hicolor/$(basename $icon .png)/apps"
+      ln -s "$icon" "$out/share/icons/hicolor/$(basename $icon .png)/apps/element.png"
+    done
+
+    mkdir -p "$out/share"
+    ln -s "${desktopItem}/share/applications" "$out/share/applications"
+
+    makeWrapper '${electron_exec}' "$out/bin/schildichat-desktop" \
+      --add-flags "$out/share/element/electron${lib.optionalString useWayland " --enable-features=UseOzonePlatform --ozone-platform=wayland"}"
+  '';
+
+  distPhase = "true";
+  desktopItem = makeDesktopItem {
+    name = "schildichat-desktop";
+    exec = "schildichat-desktop %u";
+    icon = "schildichat";
+    desktopName = "SchildiChat";
+    genericName = "Matrix Client";
+    categories = "Network;InstantMessaging;Chat;";
+    extraEntries = "StartupWMClass=schildichat\nMimeType=x-scheme-handler/element;";
+  };
+}

nix/schildichat-web.nix

@@ -0,0 +1,47 @@
+{ stdenv, mkYarnModules, nodejs, cleanSchildichatDesktopSource, schildichat-desktop-src ? ../. }:
+
+let
+  packageJSON = schildichat-desktop-src + "/element-web/package.json";
+  yarnLock = schildichat-desktop-src + "/element-web/yarn.lock";
+  version = builtins.fromJSON (builtins.readFile packageJSON).version;
+
+  modules = mkYarnModules {
+    name = "schildichat-web-modules-${version}";
+    inherit packageJSON yarnLock;
+  };
+  
+in stdenv.mkDerivation {
+  pname = "schildichat-web";
+  inherit version;
+  src = cleanSource schildichat-desktop-src;
+  buildInputs = [ nodejs ];
+
+  configurePhase = ''
+    patchShebangs .
+    cp configs/sc/config.json element-web/
+    cp -r ${modules}/node_modules .
+    chmod u+rwX -R node_modules
+    rm -rf node_modules/matrix-react-sdk
+
+    ln -s $PWD/matrix-react-sdk node_modules/
+    ln -s $PWD/node_modules matrix-react-sdk/
+    ln -s $PWD/node_modules element-web/
+  '';
+
+  buildPhase = ''
+    pushd matrix-react-sdk
+    node_modules/.bin/reskindex -h ../element-web/src/header
+    popd
+    pushd element-web
+    node scripts/copy-res.js
+    node_modules/.bin/reskindex -h src/header
+    node_modules/.bin/webpack --progress --mode production
+    popd
+  '';
+
+  installPhase = ''
+    cp -r element-web/webapp $out
+  '';
+
+  passthru.modules = modules;
+}