Add pre-commit hooks

.envrc

@@ -0,0 +1 @@
+use_nix

.gitignore

@@ -1,2 +1 @@
-# avoid weird recursion problems
-.dotfiles
+.pre-commit-config.yaml

README.md

@@ -9,7 +9,7 @@ This repo stores nix to manage my machines. The initial structure was inspired b
 ```console
 $ git clone git@github.com:davegallant/nix-config.git
 $ cd nix-config
-$ sudo ./nixos-rebuild switch
+$ sudo ./nixos-rebuild.sh switch
 ```
 
 ## Update

default.nix

@@ -0,0 +1,12 @@
+let
+  nix-pre-commit-hooks = import (builtins.fetchTarball
+    "https://github.com/cachix/pre-commit-hooks.nix/tarball/master");
+in {
+  pre-commit-check = nix-pre-commit-hooks.run {
+    src = ./.;
+    hooks = {
+      shellcheck.enable = true;
+      nixfmt.enable = true;
+    };
+  };
+}

flake.nix

@@ -7,10 +7,11 @@
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-20.09";
     nixpkgs-master.url = "github:NixOS/nixpkgs";
     nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
-    nixos-hardware.url = github:NixOS/nixos-hardware/master;
+    nixos-hardware.url = "github:NixOS/nixos-hardware/master";
   };
 
-  outputs = { self, home-manager, nixpkgs, nixpkgs-master, nixpkgs-unstable, nixos-hardware }: {
+  outputs = { self, home-manager, nixpkgs, nixpkgs-master, nixpkgs-unstable
+    , nixos-hardware }: {
       nixosConfigurations = let
         defaultModules = [
           home-manager.nixosModules.home-manager
@@ -34,9 +35,7 @@
                 nixpkgs-unstable.flake = nixpkgs-unstable;
               };
 
-            nixpkgs.overlays = [
-              (import ./overlays)
-            ];
+              nixpkgs.overlays = [ (import ./overlays) ];
 
               home-manager = {
                 useGlobalPkgs = true;

nixos-rebuild

@@ -1,3 +0,0 @@
-#!/usr/bin/env bash
-cd "$(dirname "$0")"
-exec nixos-rebuild -I nixos-config=machines/$(hostname)/configuration.nix "$@" --flake '.#'

nixos-rebuild.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+cd "$(dirname "$0")" || exit
+exec nixos-rebuild -I nixos-config="machines/$(hostname)/configuration.nix" "$@" --flake '.#'

shell.nix

@@ -0,0 +1,5 @@
+(import <nixpkgs> { }).mkShell {
+  shellHook = ''
+    ${(import ./default.nix).pre-commit-check.shellHook}
+  '';
+}