Install pre-commit-hook

.gitignore

@@ -1 +1,2 @@
 /configuration.nix
+/.pre-commit-config.yaml

home-manager/roles/nvd.nix

@@ -5,5 +5,5 @@ let
   nvd = import pkgs.sources.nvd { inherit pkgs; };
 in
 {
-  home.activation.report-changes = dag.entryAnywhere "${nvd}/bin/nvd $oldGenPath $newGenPath";
+  home.activation.report-changes = dag.entryAnywhere "${nvd}/bin/nvd diff $oldGenPath $newGenPath";
 }

nix/sources.json

@@ -117,6 +117,18 @@
         "url": "https://github.com/obsidiansystems/obelisk/archive/7ad33cbe3e84b209e83c505ce25486445bbd602e.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
+    "pre-commit-hooks.nix": {
+        "branch": "master",
+        "description": "Seamless integration of https://pre-commit.com git hooks with Nix.",
+        "homepage": "",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "40a51af82c1181b9dea3526c4124eee077e30213",
+        "sha256": "0yi1vdi0bdfmwnzrmal103vb5sk9994h6894616ivrn0r3514kai",
+        "type": "tarball",
+        "url": "https://github.com/cachix/pre-commit-hooks.nix/archive/40a51af82c1181b9dea3526c4124eee077e30213.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
     "taskwarrior-git-backend": {
         "branch": "master",
         "description": "An experimental task-sync alternative via git written in Haskell",

shell.nix

@@ -0,0 +1,5 @@
+(import (import ./nix/sources.nix).nixos-unstable { }).mkShell {
+  shellHook = ''
+    ${(import ./test.nix).pre-commit-check.shellHook}
+  '';
+}

test.nix

@@ -0,0 +1,14 @@
+let
+  nix-pre-commit-hooks = import (import ./nix/sources.nix)."pre-commit-hooks.nix";
+in
+{
+  pre-commit-check = nix-pre-commit-hooks.run {
+    src = ./.;
+    hooks = {
+      hlint.enable = true;
+      nixpkgs-fmt.enable = true;
+      fourmolu.enable = true;
+      shellcheck.enable = true;
+    };
+  };
+}