add nix/nixos development enviroment and automation for easy maintenance

make flake check action check all systems

added assignment to assign myself to flake update prs.

fix actions to use determinsys

switch nix formatting check to flake check

.envrc

@@ -0,0 +1 @@
+use flake

.github/workflows/nix-check.yml

@@ -0,0 +1,28 @@
+name: Run nix checks on prs
+
+on:
+  pull_request:
+    branches: [ "master", "rewrite/v3" ]
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  check:
+    name: Check Nix
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - name: Check flake.lock
+        uses: DeterminateSystems/flake-checker-action@main
+        with:
+          fail-mode: true
+      - name: Check Nix formatting 
+        run: nix flake check

.github/workflows/update-nix.yml

@@ -0,0 +1,21 @@
+name: update-flake-lock
+on:
+  workflow_dispatch: # allows manual triggering
+  schedule:
+    - cron: '0 0 * * 0' # runs weekly on Sunday at 00:00
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  lockfile:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - uses: DeterminateSystems/update-flake-lock@main
+        with:
+          pr-title: "Update flake.lock"
+          pr-assignees: eveeifyeve

.gitignore

@@ -12,3 +12,7 @@ config.toml
 .etc/blocks.json
 
 flame.svg
+
+.direnv
+result
+result-*

flake.nix

@@ -0,0 +1,75 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    flake-compat = {
+      url = "github:edolstra/flake-compat";
+      flake = false;
+    };
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs =
+    inputs@{
+      flake-parts,
+      nixpkgs,
+      rust-overlay,
+      ...
+    }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = nixpkgs.lib.systems.flakeExposed;
+
+      perSystem =
+        {
+          pkgs,
+          system,
+          ...
+        }:
+        {
+					formatter = nixpkgs.legacyPackages.${system}.nixfmt-rfc-style;
+          _module.args.pkgs = import inputs.nixpkgs {
+            inherit system;
+            overlays = [
+							rust-overlay.overlays.default
+          		(self: super: {
+            		rustToolchain = let rust = super.rust-bin;
+            		in if builtins.pathExists ./rust-toolchain.toml then
+              		rust.fromRustupToolchainFile ./rust-toolchain.toml
+            		else if builtins.pathExists ./rust-toolchain then
+              		rust.fromRustupToolchainFile ./rust-toolchain
+            		else
+              		rust.nightly.latest.default;
+          })
+            ];
+            config = { };
+          };
+
+          # Used to check formatting for nix specificly
+          checks.fmt-check =
+            pkgs.runCommand "format-check"
+              {
+                src = ./.;
+                doCheck = true;
+                nativeBuildInputs = [
+                  pkgs.nixfmt-rfc-style
+                ];
+              }
+              ''
+                					nixfmt --check .
+                					touch $out
+                				'';
+
+          devShells.default = pkgs.mkShell {
+            packages = with pkgs; [
+              rustToolchain
+              pkg-config
+              openssl
+            ];
+          };
+
+        };
+    };
+}

shell.nix

@@ -0,0 +1,12 @@
+(import (
+  let
+    lock = builtins.fromJSON (builtins.readFile ./flake.lock);
+    nodeName = lock.nodes.root.inputs.flake-compat;
+  in
+  fetchTarball {
+    url =
+      lock.nodes.${nodeName}.locked.url
+        or "https://github.com/edolstra/flake-compat/archive/${lock.nodes.${nodeName}.locked.rev}.tar.gz";
+    sha256 = lock.nodes.${nodeName}.locked.narHash;
+  }
+) { src = ./.; }).shellNix