ci(nix): add cachix (#87)

.github/workflows/cachix.yml

@@ -0,0 +1,33 @@
+name: Build and populate cache
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: ["ubuntu-latest", "macos-latest"]
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: cachix/install-nix-action@v23
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Setup cachix
+        uses: cachix/cachix-action@v12
+        with:
+          name: "catppuccin"
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+
+      - name: Flake check
+        run: nix flake check
+
+      - name: Build package
+        run: nix build -L .

flake.nix

@@ -7,43 +7,52 @@
     ...
   }: let
     systems = ["aarch64-darwin" "aarch64-linux" "armv6l-linux" "armv7l-linux" "x86_64-darwin" "x86_64-linux"];
-    forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
+    version = builtins.substring 0 8 self.lastModifiedDate;
+    inherit (nixpkgs) lib;
+    forAllSystems = f: lib.genAttrs systems (system: f nixpkgs.legacyPackages.${system});
   in {
-    checks = forAllSystems (system: {
-      default = self.packages.${system}.default;
+    checks = forAllSystems (pkgs: {
+      default = self.packages.${pkgs.system}.default;
     });
 
-    packages = forAllSystems (system: let
-      pkgs = nixpkgs.legacyPackages.${system};
-    in rec {
+    packages = forAllSystems (pkgs: rec {
       mdbook-catppuccin = pkgs.rustPlatform.buildRustPackage {
         pname = "mdbook-catppuccin";
-        version = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.version;
+        inherit version;
         buildInputs = with pkgs; ([] ++ lib.optionals stdenv.isDarwin [libiconv]);
         src = pkgs.nix-gitignore.gitignoreSource [] ./.;
         cargoLock.lockFile = ./Cargo.lock;
       };
       default = mdbook-catppuccin;
     });
 
-    devShells = forAllSystems (system: let
-      pkgs = nixpkgs.legacyPackages.${system};
-    in rec {
+    devShells = forAllSystems (pkgs: rec {
       default = pkgs.mkShell {
         buildInputs = with pkgs; (
           [
+            rustc
             cargo
+            gcc
+            rustfmt
+            clippy
+            rust-analyzer
             # mdbook
             mdbook-admonish
             node2nix
             nodejs
           ]
           ++ lib.optionals stdenv.isDarwin [libiconv]
         );
+        RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
       };
       demo = pkgs.mkShell {
-        buildInputs = default.buildInputs ++ [self.packages.${system}.mdbook-catppuccin];
+        buildInputs = default.buildInputs ++ [self.packages.${pkgs.system}.mdbook-catppuccin];
       };
     });
   };
+
+  nixConfig = {
+    extra-substituters = ["https://catppuccin.cachix.org"];
+    extra-trusted-public-keys = ["catppuccin.cachix.org-1:noG/4HkbhJb+lUAdKrph6LaozJvAeEEZj4N732IysmU="];
+  };
 }