sci-ml/lemonade: add webui USE flag for the bundled web frontend

lemond serves a React single-page app at the server root (/) when

resources/web-app/ is present; the build passed -DBUILD_WEB_APP=OFF, so

lemond only served a static "built without a web app" placeholder there.

The new webui flag flips BUILD_WEB_APP=ON, which runs npm ci + webpack at

build time (net-libs/nodejs provides node+npm) and stages the SPA into

share/lemonade-server/resources/web-app/, where lemond auto-detects and

serves it.

The npm fetch fits the existing network build (PROPERTIES=live plus

FetchContent under RESTRICT=network-sandbox). Upstream's

USE_SYSTEM_NODEJS_MODULES path avoids the fetch but needs React, webpack

and the KaTeX assets resolvable under /usr/share/nodejs, which ::gentoo

does not package, so npm-at-build is the only viable route. Off by

default; the Tauri desktop wrapper stays unbuilt.

Author: istitov

…i-ml/lemonade/lemonade-10.10.0-r2.ebuild …i-ml/lemonade/lemonade-10.10.0-r3.ebuildsci-ml/lemonade/lemonade-10.10.0-r2.ebuild renamed to sci-ml/lemonade/lemonade-10.10.0-r3.ebuild sci-ml/lemonade/lemonade-10.10.0-r2.ebuild renamed to sci-ml/lemonade/lemonade-10.10.0-r3.ebuild

@@ -15,7 +15,7 @@ SRC_URI="https://github.com/lemonade-sdk/${PN}/archive/refs/tags/v${PV}.tar.gz -
 LICENSE="Apache-2.0"
 SLOT="0"
 KEYWORDS="~amd64"
-IUSE="fastflowlm openrc system-kokoro system-llamacpp system-sdcpp system-whispercpp systemd"
+IUSE="fastflowlm openrc system-kokoro system-llamacpp system-sdcpp system-whispercpp systemd webui"
 
 # Upstream's CMake detects nlohmann_json/curl/zstd/CLI11 via pkg-config or
 # find_path, but cpp-httplib detection requires a .pc file (which ::gentoo
@@ -54,6 +54,7 @@ BDEPEND="
 	system-whispercpp? ( app-misc/jq )
 	system-sdcpp? ( app-misc/jq )
 	system-kokoro? ( app-misc/jq )
+	webui? ( net-libs/nodejs[npm] )
 "
 
 src_prepare() {
@@ -74,10 +75,16 @@ src_prepare() {
 }
 
 src_configure() {
-	# BUILD_WEB_APP defaults ON on Linux but pulls Node.js + npm install
-	# at build time; BUILD_TAURI_APP brings cargo + Rust GUI bundling.
-	# Both are off here for a server-only build; revisit if a USE flag is
-	# requested for the desktop GUI.
+	# BUILD_WEB_APP (USE=webui) builds the bundled React SPA that lemond
+	# serves at the server root (/); without it lemond serves a static
+	# "built without a web app" placeholder there. The build runs `npm ci`
+	# (fetching the JS dependency tree from the npm registry — hence the
+	# network build, already the case here for FetchContent) then webpack.
+	# net-libs/nodejs provides node+npm. Upstream's USE_SYSTEM_NODEJS_MODULES
+	# path (system webpack + distro JS libs under /usr/share/nodejs) would
+	# avoid the npm fetch, but ::gentoo doesn't package those modules, so the
+	# npm fetch is the only viable route. BUILD_TAURI_APP (cargo + Rust
+	# desktop GUI + webkit2gtk) stays off — no USE flag for it yet.
 	#
 	# Upstream defaults to /opt as the prefix for Linux, but lemond's
 	# get_resource_path() searches /usr/share/lemonade-server/ and
@@ -86,7 +93,7 @@ src_configure() {
 	# .deb/.rpm layout and lets the resources resolve cleanly.
 	local mycmakeargs=(
 		-DCMAKE_INSTALL_PREFIX="/usr"
-		-DBUILD_WEB_APP=OFF
+		-DBUILD_WEB_APP=$(usex webui ON OFF)
 		-DBUILD_TAURI_APP=OFF
 	)
 	cmake_src_configure
@@ -221,6 +228,12 @@ pkg_postinst() {
 	elog "  lemond                   # start the server (port 13305 by default)"
 	elog "  lemonade run <model>     # CLI client"
 	elog ""
+	if use webui; then
+		elog "Web UI: lemond serves the bundled React app at the server root,"
+		elog "e.g. http://127.0.0.1:13305/ -- open it in a browser. It shares the"
+		elog "API's bind, so it is loopback-only unless you widen LEMONADE_HOST."
+		elog ""
+	fi
 	if use openrc; then
 		elog "OpenRC service (supervise-daemon; auto-restart on crash):"
 		elog "  edit /etc/conf.d/lemonade and set LEMONADE_USER (required)"

sci-ml/lemonade/metadata.xml

@@ -9,9 +9,9 @@
     Lemonade is a local AI server that exposes optimized LLMs through
     OpenAI / Anthropic / Ollama compatible APIs, running inference on
     AMD NPU and GPU. The C++ server core (lemond, lemonade-server) is
-    packaged here without the Tauri desktop wrapper or the bundled
-    web frontend; both are CMake-toggleable and can be added behind
-    USE flags later if needed.
+    packaged here without the Tauri desktop wrapper; the bundled web
+    frontend is available behind USE=webui, and the Tauri wrapper stays
+    CMake-toggleable and can be added behind a USE flag later if needed.
 
     Pairs with sci-ml/fastflowlm to drive the AMD Ryzen AI XDNA2 NPU
     backend.
@@ -24,6 +24,7 @@
     <flag name="system-sdcpp">Reuse the system <pkg>sci-misc/stable-diffusion-cpp</pkg> (/usr/bin/sd-server) for the stable-diffusion.cpp backend instead of fetching an upstream prebuilt binary at runtime; build it with your preferred GPU backend (see the post-install notes)</flag>
     <flag name="system-whispercpp">Reuse the system <pkg>app-accessibility/whisper-cpp</pkg> (/usr/bin/whisper-server) for the whisper.cpp backend instead of fetching an upstream prebuilt binary at runtime; build it with your preferred GPU backend (see the post-install notes)</flag>
     <flag name="systemd">Keep upstream's systemd units (lemond.service, system + user), running as a dedicated <pkg>acct-user/lemonade</pkg></flag>
+    <flag name="webui">Build the bundled React web frontend (served by lemond at the server root) via <pkg>net-libs/nodejs</pkg>; runs npm/webpack over the network at build time. Without it lemond serves a static placeholder page</flag>
   </use>
   <upstream>
     <remote-id type="github">lemonade-sdk/lemonade</remote-id>