Use pre-commit to format before commit

flake.nix

@@ -3,6 +3,7 @@
 
   inputs = {
     disko.url = "github:nix-community/disko";
+    flake-utils.url = "github:numtide/flake-utils";
     hardware.url = "github:nixos/nixos-hardware";
     home-manager.url = "github:nix-community/home-manager";
     jovian.url = "github:Jovian-Experiments/Jovian-NixOS";
@@ -10,54 +11,75 @@
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
     nix-custom.url = "git+https://forgejo.invariantspace.com/macronova/nix-custom";
     plasma-manager.url = "github:pjones/plasma-manager";
+    pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";
     sops-nix.url = "github:Mic92/sops-nix";
   };
 
   outputs = inputs @ {
     self,
+    flake-utils,
     nixpkgs,
     nix-custom,
+    pre-commit-hooks,
     ...
   }: let
     linuxCfgDir = ./linux;
     templateDir = ./template;
-  in {
-    nixosConfigurations =
-      builtins.mapAttrs
-      (instance: _:
-        nixpkgs.lib.nixosSystem {
-          modules = [
-            # Import config from folder
-            (linuxCfgDir + "/${instance}")
-            # Setup Nix
-            ({pkgs, ...}: {
-              networking.hostName = instance;
-              nix = {
-                gc = {
-                  automatic = true;
-                  options = "--delete-older-than 30d";
+  in
+    {
+      nixosConfigurations =
+        builtins.mapAttrs
+        (instance: _:
+          nixpkgs.lib.nixosSystem {
+            modules = [
+              # Import config from folder
+              (linuxCfgDir + "/${instance}")
+              # Setup Nix
+              ({pkgs, ...}: {
+                networking.hostName = instance;
+                nix = {
+                  gc = {
+                    automatic = true;
+                    options = "--delete-older-than 30d";
+                  };
+                  settings = {
+                    auto-optimise-store = true;
+                    experimental-features = ["nix-command" "flakes"];
+                    trusted-substituters = ["https://mirrors.tuna.tsinghua.edu.cn/nix-channels/store"];
+                  };
                 };
-                settings = {
-                  auto-optimise-store = true;
-                  experimental-features = ["nix-command" "flakes"];
-                  trusted-substituters = ["https://mirrors.tuna.tsinghua.edu.cn/nix-channels/store"];
+                nixpkgs = {
+                  config.allowUnfree = true;
+                  overlays = [nix-custom.overlays.default];
                 };
-              };
-              nixpkgs = {
-                config.allowUnfree = true;
-                overlays = [nix-custom.overlays.default];
-              };
-            })
-          ];
-          specialArgs = {inherit inputs;};
+              })
+            ];
+            specialArgs = {inherit inputs;};
+          })
+        (builtins.readDir linuxCfgDir);
+      templates =
+        builtins.mapAttrs
+        (template: _: {
+          path = templateDir + "/${template}";
+          description = "Template flake setup: ${template}";
         })
-      (builtins.readDir linuxCfgDir);
-    templates =
-      builtins.mapAttrs
-      (template: _: {
-        path = templateDir + "/${template}";
-        description = "Template flake setup: ${template}";
+        (builtins.readDir templateDir);
+    }
+    // (
+      flake-utils.lib.eachDefaultSystem (system: let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in {
+        checks.pre-commit-check = pre-commit-hooks.lib.${system}.run {
+          src = ./.;
+          hooks.alejandra.enable = true;
+        };
+        devShells.default = let
+          pre-commit = self.checks.${system}.pre-commit-check;
+        in
+          pkgs.mkShell {
+            inherit (pre-commit) shellHook;
+            buildInputs = pre-commit.enabledPackages;
+          };
       })
-      (builtins.readDir templateDir);
-  };
+    );
 }