feat(flakeModules): Add git-hook module and use it to configure pre-commit

Author: PetarKirov

.gitignore

@@ -13,3 +13,6 @@ matrix-*.json
 shardMatrix.json
 
 .vscode
+
+# Pre Commit
+.pre-commit-config.yaml

checks/default.nix

@@ -2,5 +2,6 @@
 {
   imports = [
     ./packages-ci-matrix.nix
+    ./pre-commit.nix
   ];
 }

checks/pre-commit.nix

@@ -0,0 +1,48 @@
+{ inputs, ... }:
+{
+  flake.flakeModules.git-hooks =
+    { config, ... }:
+    {
+      imports = [
+        # Import git-hooks flake-parts module
+        # docs: https://flake.parts/options/git-hooks-nix
+        inputs.git-hooks-nix.flakeModule
+      ];
+
+      config = {
+        perSystem =
+          { ... }:
+          {
+            # impl: https://github.com/cachix/git-hooks.nix/blob/master/flake-module.nix
+            pre-commit = {
+              # Add flake `checks` output
+              check.enable = true;
+
+              # Enable commonly used formatters
+              settings.hooks = {
+                # Basic whitespace formatting
+                editorconfig-checker.enable = true;
+
+                # *.nix formatting
+                nixfmt-rfc-style.enable = true;
+
+                # *.rs formatting
+                rustfmt.enable = true;
+
+                # *.{js,jsx,ts,tsx,css,html,md,json} formatting
+                prettier = {
+                  enable = true;
+                  args = [
+                    "--check"
+                    "--list-different=false"
+                    "--log-level=warn"
+                    "--ignore-unknown"
+                    "--write"
+                  ];
+                };
+              };
+            };
+          };
+      };
+    };
+}

flake.nix

@@ -225,6 +225,7 @@
         ./checks
         ./modules
         ./packages
+        ./shells
       ];
       systems = [
         "x86_64-linux"
@@ -233,18 +234,12 @@
         "aarch64-darwin"
       ];
       perSystem =
-        {
-          system,
-          pkgs,
-          inputs',
-          ...
-        }:
+        { pkgs, system, ... }:
         {
           _module.args.pkgs = import nixpkgs {
             inherit system;
             config.allowUnfree = true;
           };
-          devShells.default = import ./shells/default.nix { inherit pkgs flake inputs'; };
           devShells.ci = import ./shells/ci.nix { inherit pkgs; };
         };
       flake.lib.create =

shells/default.nix

@@ -1,36 +1,54 @@
+{ inputs, ... }:
 {
-  pkgs,
-  flake,
-  inputs',
-  ...
-}:
-let
-  repl = pkgs.writeShellApplication {
-    name = "repl";
-    text = ''
-      nix repl --file "$REPO_ROOT/repl.nix";
-    '';
-  };
-in
-pkgs.mkShell {
-  packages = with pkgs; [
-    inputs'.agenix.packages.agenix
-    inputs'.nixos-anywhere.packages.nixos-anywhere
-    figlet
-    just
-    jq
-    nix-eval-jobs
-    nixos-rebuild
-    nix-output-monitor
-    repl
-    rage
-    inputs'.dlang-nix.packages.dmd
-    inputs'.dlang-nix.packages.dub
-    act
+  imports = [
+    (import ../checks/pre-commit.nix {
+      inherit inputs;
+    }).flake.flakeModules.git-hooks
   ];
 
-  shellHook = ''
-    export REPO_ROOT="$PWD"
-    figlet -t "${flake.description}"
-  '';
+  perSystem =
+    {
+      pkgs,
+      inputs',
+      config,
+      ...
+    }:
+    {
+      devShells.default =
+        let
+          repl = pkgs.writeShellApplication {
+            name = "repl";
+            text = ''
+              nix repl --file "$REPO_ROOT/repl.nix";
+            '';
+          };
+        in
+        pkgs.mkShell {
+          packages =
+            with pkgs;
+            [
+              inputs'.agenix.packages.agenix
+              inputs'.nixos-anywhere.packages.nixos-anywhere
+              figlet
+              just
+              jq
+              nix-eval-jobs
+              nixos-rebuild
+              nix-output-monitor
+              repl
+              rage
+              inputs'.dlang-nix.packages.dub
+            ]
+            ++ pkgs.lib.optionals (pkgs.stdenv.system == "x86_64-linux") [
+              inputs'.dlang-nix.packages.dmd
+            ];
+
+          shellHook =
+            ''
+              export REPO_ROOT="$PWD"
+              figlet -t "Metacraft Nixos Modules"
+            ''
+            + config.pre-commit.installationScript;
+        };
+    };
 }