xpra-html5: init at v17

Also add as an optional dependency of xpra, enabled by default.

Closes #384368

pkgs/by-name/xp/xpra-html5/package.nix

@@ -0,0 +1,35 @@
+{
+  lib,
+  fetchFromGitHub,
+  stdenv,
+  python3,
+  uglify-js,
+}:
+stdenv.mkDerivation rec {
+  name = "xpra-html5";
+  version = "17";
+
+  src = fetchFromGitHub {
+    owner = "Xpra-org";
+    repo = "xpra-html5";
+    rev = "v${version}";
+    hash = "sha256-SwP7NazsiUyDD4LUziCwN0X9GTQVq0lYM2jXqNaXLEA=";
+  };
+  buildInputs = [
+    python3
+    uglify-js
+  ];
+  installPhase = "python $src/setup.py install $out /share/xpra/www /share/xpra/www";
+
+  meta = with lib; {
+    homepage = "https://xpra.org/";
+    downloadPage = "https://xpra.org/src/";
+    description = "HTML5 client for Xpra";
+    changelog = "https://github.com/Xpra-org/xpra-html5/releases/tag/v${version}";
+    platforms = platforms.linux;
+    license = licenses.mpl20;
+    maintainers = with maintainers; [
+      catern
+    ];
+  };
+}

pkgs/tools/X11/xpra/default.nix

@@ -41,6 +41,8 @@
   xorgserver,
   xxHash,
   clang,
+  withHtml ? true,
+  xpra-html5,
 }@args:
 
 let
@@ -240,16 +242,20 @@ buildPythonApplication rec {
       )
     '';
 
-  postInstall = ''
-    # append module paths to xorg.conf
-    cat ${xorgModulePaths} >> $out/etc/xpra/xorg.conf
-    cat ${xorgModulePaths} >> $out/etc/xpra/xorg-uinput.conf
+  postInstall =
+    ''
+      # append module paths to xorg.conf
+      cat ${xorgModulePaths} >> $out/etc/xpra/xorg.conf
+      cat ${xorgModulePaths} >> $out/etc/xpra/xorg-uinput.conf
 
-    # make application icon visible to desktop environemnts
-    icon_dir="$out/share/icons/hicolor/64x64/apps"
-    mkdir -p "$icon_dir"
-    ln -sr "$out/share/icons/xpra.png" "$icon_dir"
-  '';
+      # make application icon visible to desktop environemnts
+      icon_dir="$out/share/icons/hicolor/64x64/apps"
+      mkdir -p "$icon_dir"
+      ln -sr "$out/share/icons/xpra.png" "$icon_dir"
+    ''
+    + lib.optionalString withHtml ''
+      ln -s ${xpra-html5}/share/xpra/www $out/share/xpra/www;
+    '';
 
   doCheck = false;