flake: add checks

This is not working great so far.

2 files changed, 77 insertions, 0 deletions

diff --git a/flake.lock b/flake.lock
index 6a02041..83720bd 100644
--- a/flake.lock
+++ b/flake.lock
@@ -35,6 +35,36 @@
         "type": "github"
       }
     },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1649676176,
+        "narHash": "sha256-OWKJratjt2RW151VUlJPRALb7OU2S5s+f0vLj4o1bHM=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "a4b154ebbdc88c8498a5c7b01589addc9e9cb678",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1644229661,
+        "narHash": "sha256-1YdnJAsNy69bpcjuoKdOYQX0YxZBiCYZo4Twxerqv7k=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "3cecb5b042f7f209c56ffd8371b2711a290ec797",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "home-manager": {
       "inputs": {
         "nixpkgs": [
@@ -88,6 +118,20 @@
         "type": "github"
       }
     },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1645655918,
+        "narHash": "sha256-ZfbEFRW7o237+A1P7eTKhXje435FCAoe0blj2n20Was=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "77a7a4197740213879b9a1d2e1788c6c8ade4274",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
     "nur": {
       "locked": {
         "lastModified": 1645979938,
@@ -103,14 +147,35 @@
         "type": "github"
       }
     },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1649054408,
+        "narHash": "sha256-wz8AH7orqUE4Xog29WMTqOYBs0DMj2wFM8ulrTRVgz0=",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "e5e7b3b542e7f4f96967966a943d7e1c07558042",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "agenix": "agenix",
         "emacs-overlay": "emacs-overlay",
+        "flake-utils": "flake-utils",
         "home-manager": "home-manager",
         "nixpkgs": "nixpkgs",
         "nixpkgs-unstable": "nixpkgs-unstable",
         "nur": "nur",
+        "pre-commit-hooks": "pre-commit-hooks",
         "utils": "utils"
       }
     },
diff --git a/flake.nix b/flake.nix
index 6e08393..ae89d70 100644
--- a/flake.nix
+++ b/flake.nix
@@ -19,6 +19,9 @@
 
     nur.url = "github:nix-community/NUR";
 
+    pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";
+    flake-utils.url = "github:numtide/flake-utils";
+
     home-manager = {
       url = "github:nix-community/home-manager/release-21.11";
       # We want home-manager to use the same set of nixpkgs as our system.
@@ -51,6 +54,15 @@
       in {
         packages = pkgs // { inherit home-manager; };
 
+        checks = {
+          pre-commit-check = inputs.pre-commit-hooks.lib.${system}.run {
+            src = ./.;
+            hooks = {
+              nixpkgs-fmt.enable = true;
+              shellcheck.enable = true;
+            };
+          };
+        };
         devShell = pkgs.mkShell {
           buildInputs = with pkgs; [
             nixUnstable