Add flake.nix again

[DINEXXL]

Description

I found the time to create a new flake.nix file for the new version, and I included Nix instructions in README.md

Just go along with it so there won't be any conflicts later, please

[Copilot]

Pull request overview

Reintroduces Nix flake support for building/running the Electron-based opennow-stable app from Nix, and documents how to consume it from a user flake.

Changes:

• Adds flake.nix/flake.lock to provide a default Nix package for opennow-stable.
• Documents Nix usage in README.md.
• Updates opennow-stable/package-lock.json metadata and adjusts .gitignore for Nix build outputs.

Reviewed changes

Copilot reviewed 2 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
opennow-stable/package-lock.json	Updates lockfile metadata (including package version) and dependency entries.
flake.nix	Introduces a Nix flake that builds opennow-stable via buildNpmPackage and wraps it with Electron.
flake.lock	Pins nixpkgs and flake-utils inputs for reproducible flake evaluation.
README.md	Adds Nix installation/consumption instructions.
.gitignore	Ignores the Nix result build symlink.

Files not reviewed (1)

• opennow-stable/package-lock.json: Language not supported

[Copilot]

opennow-stable/package-lock.json is currently being updated in this PR, but it’s also listed in .gitignore. Even though tracked files aren’t ignored, this is confusing for contributors and can lead to accidental local-only changes. Consider either removing this ignore entry or explicitly untracking/stop committing the lockfile (pick one consistent approach).

[Copilot]

The flake package version is hardcoded to 1.0.0, which doesn’t match the app version (0.3.6 in opennow-stable/package.json). This will make Nix users/reporting/debugging inconsistent; consider aligning the flake version with the actual app version (or deriving it from the package sources).

Suggested change

	in
	{
	packages.default = pkgs.buildNpmPackage {
	pname = "opennow";
	version = "1.0.0";
	appPackage = builtins.fromJSON (builtins.readFile ./opennow-stable/package.json);
	in
	{
	packages.default = pkgs.buildNpmPackage {
	pname = "opennow";
	version = appPackage.version;

[Copilot]

The custom installPhase copies the entire build directory (cp -r .) into the output. With buildNpmPackage this typically includes the full node_modules tree (often with devDependencies) and build caches, which can massively increase closure size and make the result less reproducible. Prefer installing only the runtime artifacts needed to launch (and pruning devDependencies if possible).

Suggested change

	mkdir -p $out/lib/opennow
	cp -r . $out/lib/opennow
	appdir="$TMPDIR/opennow-install"
	mkdir -p "$appdir" "$out/lib/opennow"
	if [ -f package.json ]; then
	cp package.json "$appdir/"
	fi
	if [ -f package-lock.json ]; then
	cp package-lock.json "$appdir/"
	fi
	for path in out dist dist-electron; do
	if [ -e "$path" ]; then
	cp -r "$path" "$appdir/"
	fi
	done
	if [ -d node_modules ]; then
	cp -r node_modules "$appdir/"
	if [ -f "$appdir/package.json" ]; then
	npm --prefix "$appdir" prune --omit=dev --no-audit --legacy-peer-deps
	fi
	fi
	cp -r "$appdir"/. $out/lib/opennow

[Copilot]

Typo: configuraion should be configuration.

Suggested change

	# Nixos configuraion
	# NixOS configuration

[Kief5555]

LGTM, waiting for AI Review

[Copilot]

Pull request overview

Copilot reviewed 3 out of 6 changed files in this pull request and generated 6 comments.

Files not reviewed (1)

• opennow-stable/package-lock.json: Language not supported

[Copilot]

There’s trailing whitespace after values in the desktop item fields here (e.g. after desktopName / startupWMClass). It’s harmless but tends to create noisy diffs and can trip whitespace-sensitive tooling—please trim it.

Suggested change

	desktopName = "OpenNOW";
	genericName = "Custom GeForce Now Client Named OpenNOW";
	comment = "An open-source desktop client for GeForce NOW";
	exec = "opennow %U";
	icon = "opennow";
	keywords = [ "GFN" "GeForceNOW" "cloud" "gaming" ];
	startupWMClass = "opennow";
	startupNotify = true;
	categories = [ "Game" "Network" ];
	mimeTypes = [
	"x-scheme-handler/opennow"
	"x-scheme-handler/geforcenow"
	desktopName = "OpenNOW";
	genericName = "Custom GeForce Now Client Named OpenNOW";
	comment = "An open-source desktop client for GeForce NOW";
	exec = "opennow %U";
	icon = "opennow";
	keywords = [ "GFN" "GeForceNOW" "cloud" "gaming" ];
	startupWMClass = "opennow";
	startupNotify = true;
	categories = [ "Game" "Network" ];
	mimeTypes = [
	"x-scheme-handler/opennow"
	"x-scheme-handler/geforcenow"

[Kief5555]

Pending approval @zortos293 version number change?

[zortos293]

@Kief5555 yes