added pre-commit support for automated code linting/formatting

flake-module.nix

@@ -1,28 +1,61 @@
-{inputs, ...}:
-{
+{inputs, ...}: {
   # debug = true;
   # We only define machines config in this flake yet, so we only include
   # the module that builds these. This file might get fuller, if we need to
   # build our own packages, that are not flakes.
-  imports = [ ./nixos/flake-module.nix
-        # To import a flake module
-        # 1. Add foo to inputs
-        # 2. Add foo as a parameter to the outputs function
-        # 3. Add here: foo.flakeModule
-
+  imports = [
+    ./nixos/flake-module.nix
+    inputs.pre-commit-hooks.flakeModule
+    # To import a flake module
+    # 1. Add foo to inputs
+    # 2. Add foo as a parameter to the outputs function
+    # 3. Add here: foo.flakeModule
   ];
-  systems = [ "x86_64-linux"];
-#  perSystem = { config, self', inputs', pkgs, system, ... }: {
-  # Per-system attributes can be defined here. The self' and inputs'
-  # module parameters provide easy access to attributes of the same
-  # system.
+  systems = ["x86_64-linux"];
+  perSystem = {
+    config,
+    inputs',
+    pkgs,
+    ...
+  }: {
+    devShells.default = config.pre-commit.devShell;
+
+    pre-commit = let
+      generatedFiles = [
+        "hardware-configuration\\.nix"
+      ];
+    in {
+      check.enable = true;
+      settings = {
+        # for some reason statix takes it config differently than all the other hooks.
+        settings.statix = {
+          format = "stderr";
+          ignore = generatedFiles;
+        };
+        hooks = {
+          nil.enable = true;
+          statix.enable = true;
+          deadnix = {
+            enable = true;
+            excludes = generatedFiles;
+          };
+          alejandra.enable = true;
+        };
+      };
+    };
+
+    formatter = pkgs.alejandra;
+
+    # Per-system attributes can be defined here. The self' and inputs'
+    # module parameters provide easy access to attributes of the same
+    # system.
+  };
 
   # Equivalent to  inputs'.nixpkgs.legacyPackages.hello;
-#  };
-#      flake = {
-        # The usual flake attributes can be defined here, including system-
-        # agnostic ones like nixosModule and system-enumerating ones, although
-        # those are more easily expressed in perSystem.
+  #      flake = {
+  # The usual flake attributes can be defined here, including system-
+  # agnostic ones like nixosModule and system-enumerating ones, although
+  # those are more easily expressed in perSystem.
 
-#      };
+  #      };
 }