Add flake and CI

.github/workflows/build.yml

@@ -0,0 +1,20 @@
+name: "Build"
+
+on:
+  push: {}
+  pull_request: {}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+       fetch-depth: 0
+    - uses: cachix/install-nix-action@v22
+    - uses: cachix/cachix-action@v12
+      with:
+        name: zcauchemar
+        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+    - name: Build
+      run: nix build

.gitignore

@@ -1,3 +1,3 @@
 zig-cache/
 zig-out/
-
+result

flake.nix

@@ -0,0 +1,56 @@
+{
+  description = "Stack-based programming language which emulates the look and feel of the 60s";
+
+  inputs = {
+    utils.url = "github:numtide/flake-utils";
+    gitignore.url = "github:hercules-ci/gitignore.nix";
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    zig = {
+      url = "github:mitchellh/zig-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    zls = {
+      url = "github:zigtools/zls";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        zig-overlay.follows = "zig";
+      };
+    };
+  };
+
+  outputs = { self, utils, gitignore, nixpkgs, zig, zls }: 
+    utils.lib.eachDefaultSystem (system:
+      let
+        inherit (gitignore.lib) gitignoreSource;
+
+        pkgs = import nixpkgs { 
+          inherit system;
+          overlays = [
+            zig.overlays.default
+            (self: super: {
+              inherit (zls.packages.${self.system}) zls;
+            })
+          ];
+        };
+      in
+      {
+        packages = rec {
+          zcauchemar = pkgs.stdenvNoCC.mkDerivation {
+            name = "zcauchemar";
+            version = "main";
+            src = gitignoreSource ./.;
+            nativeBuildInputs = [ pkgs.zigpkgs.master ];
+            dontConfigure = true;
+            dontInstall = true;
+            buildPhase = ''
+              mkdir -p $out
+              mkdir -p .cache/{p,z,tmp}
+              zig build install --cache-dir $(pwd)/zig-cache --global-cache-dir $(pwd)/.cache -Dcpu=baseline -Doptimize=ReleaseSafe --prefix $out
+            '';
+          };
+
+          default = zcauchemar;
+        };
+      }
+    );
+}