Have devShell install git pre-commit hook

default.nix

@@ -62,6 +62,14 @@ let
           + optionalString (!pathExists (src + /.ecrc))
           " -disable-indent-size -disable-max-line-length";
       });
+    shellHook = { lib, flakelite }: ''
+      if [ -f flake.nix ] && [ -d .git/hooks ] &&
+         [ ! -f .git/hooks/pre-commit ]; then
+        echo Installing git pre-commit hook...
+        cp ${lib.getExe flakelite.inputs'.flakelite.packages.pre-commit
+            } .git/hooks
+      fi
+    '';
     devTools = pkgs: with pkgs; [ nixpkgs-fmt nodePackages.prettier ];
     formatters = {
       "*.nix" = "nixpkgs-fmt";

flake.nix

@@ -6,9 +6,10 @@
   inputs.nixpkgs.url = "nixpkgs/nixos-22.11";
   outputs = inputs:
     let
-      lib = import ./. inputs;
+      flakelite.lib = import ./. inputs;
     in
-    lib.mkFlake ./. {
+    flakelite.lib.mkFlake ./. {
-      outputs = { inherit lib; };
+      nixDir = ./.;
+      outputs = flakelite;
     };
 }

packages/pre-commit

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+set -euo pipefail
+TREE=$(mktemp -d)
+git archive "$(git write-tree)" | tar -xC "$TREE"
+nix flake check "$TREE"

packages/pre-commit.nix

@@ -0,0 +1,10 @@
+{ writeShellApplication
+, nix
+, git
+, gnutar
+}:
+writeShellApplication {
+  name = "pre-commit";
+  runtimeInputs = [ nix git gnutar ];
+  text = builtins.readFile ./pre-commit;
+}