From 579e0ecd4bb5cd67debcfee10d69c7bfa37d630c Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Fri, 20 Jun 2025 10:23:53 +0200
Subject: Adding basic nix files

---
 .gitignore          |  1 +
 .nix/derivation.nix | 29 +++++++++++++++++++++++++++++
 c++/lights_out.cpp  |  9 +++++++--
 default.nix         |  8 ++++++++
 4 files changed, 45 insertions(+), 2 deletions(-)
 create mode 100644 .gitignore
 create mode 100644 .nix/derivation.nix
 create mode 100644 default.nix

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fcfc4a1
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+result*
diff --git a/.nix/derivation.nix b/.nix/derivation.nix
new file mode 100644
index 0000000..c3f76a3
--- /dev/null
+++ b/.nix/derivation.nix
@@ -0,0 +1,29 @@
+{ lib
+, stdenv
+}:
+
+stdenv.mkDerivation {
+	pname = "kel_lights_out";
+	version = "0.0.0";
+
+	src = ./..;
+
+	dontConfigure = true;
+	buildPhase = ''
+		HOME=$(pwd)
+    emcc c++/lights_out.cpp \
+      -s WASM=1 \
+      -s EXPORTED_FUNCTIONS='["_fake_main"]' \
+      -s EXPORTED_RUNTIME_METHODS='["ccall", "cwrap"]' \
+      -o lights_out.js
+	'';
+
+	# Silence the warnings for now
+	checkPhase = ''
+	'';
+
+	installPhase = ''
+		mkdir -p $out
+		cp lights_out.{wasm,js} $out/
+	'';
+}
diff --git a/c++/lights_out.cpp b/c++/lights_out.cpp
index 9b8503f..810f403 100644
--- a/c++/lights_out.cpp
+++ b/c++/lights_out.cpp
@@ -91,8 +91,8 @@ bool lu_decompose_gf2(Mat& R, std::array<size_t,MN>& P){
 
     return true;
 }
-
-int main(){
+extern "C"{
+int fake_main(){
     Mat A;
     
     Vec b{
@@ -169,3 +169,8 @@ int main(){
 
     return 0;
 }
+}
+
+int main(){
+	return fake_main();
+}
diff --git a/default.nix b/default.nix
new file mode 100644
index 0000000..c2bb53f
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,8 @@
+{ pkgs ? import <nixpkgs> {}
+, stdenv ? pkgs.emscriptenStdenv
+, ...
+}:
+
+pkgs.callPackage .nix/derivation.nix {
+	inherit stdenv;
+}
-- 
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