Make the nix stuff work reliably (#70)

This fixes some commands that were depending on things being in the
system path and not provided by the nix development environment. It also
makes the precommit hooks more efficient, now only ever running on
changed files as needed.

.husky/pre-commit

@@ -1 +1 @@
-cargo clippy --all-targets --all-features -- -D warnings && cargo +nightly fmt && npx lint-staged
+npx lint-staged

flake.nix

@@ -71,9 +71,9 @@
 
         # We get your default shell to make sure things feel familiar in the dev shell.
         getUserShellCommand = if pkgs.stdenv.hostPlatform.isDarwin then
-          "dscl . -read ~ UserShell | cut -d ' ' -f2"
+          "dscl . -read ~ UserShell | cut -d ' ' -f2 | tr -d '\n'"
         else
-          "getent passwd $USER | cut -d ':' -f7";
+          "getent passwd $USER | cut -d ':' -f7 | tr -d '\n'";
       in {
         packages = {
           inherit all;
@@ -98,6 +98,10 @@
         devShells.ci = craneLib.devShell {
           LLVM_SYS_180_PREFIX = "${pkgs.lib.getDev pkgs.llvmPackages_18.libllvm}";
           inputsFrom = lib.attrValues llvmToCairo;
+
+          packages = [
+            pkgs.nodejs_22
+          ];
         };
       }
     );

package.json

@@ -8,11 +8,15 @@
   "lint-staged": {
     "(*.md|*.toml|*.json|*.yaml|*.yml|*.css|*.js|*.ts)": [
       "prettier --write"
+    ],
+    "*.rs": [
+      "rustfmt --unstable-features --edition 2021",
+      "clippy-driver"
     ]
   },
   "husky": {
     "hooks": {
-      "pre-commit": "npx lint-staged && cargo clippy -- -D warnings"
+      "pre-commit": "npx lint-staged"
     }
   },
   "scripts": {