build wasm

.gitignore

@@ -1 +1,4 @@
 .direnv
+/triangle
+/triangle.wasm
+/result*

flake.nix

@@ -5,10 +5,16 @@
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = import nixpkgs { inherit system; };
-        flakePkgs = { triangle = pkgs.callPackage ./. { }; };
+        flakePkgs = {
+          triangle = pkgs.callPackage ./. { };
+          triangle-wasm = pkgs.callPackage ./wasm.nix { };
+        };
 
       in {
         packages = flakePkgs;
-        devShell = pkgs.mkShell { packages = with pkgs; [ nixfmt ]; };
+        devShell = pkgs.mkShell {
+          inputsFrom = with flakePkgs; [ triangle ];
+          packages = with pkgs; [ nixfmt emscripten ];
+        };
       });
 }

wasm.nix

@@ -0,0 +1,18 @@
+{ buildEmscriptenPackage }:
+
+buildEmscriptenPackage {
+  name = "triangle";
+  src = ./.;
+
+  configurePhase = "";
+  buildPhase = ''
+    export EM_CACHE=/tmp/em-cache
+    emcc -o triangle triangle.c
+  '';
+  checkPhase = "";
+  installPhase = ''
+    mkdir -p $out
+    ls -al
+    mv triangle triangle.wasm $out
+  '';
+}