Add nix to git hook

.husky/pre-commit

@@ -1,4 +1,24 @@
 #!/usr/bin/env sh
+#!nix-shell -i "bash" -p bash prefetch-npm-deps jq nodejs nix-output-monitor
 . "$(dirname -- "$0")/_/husky.sh"
 
-npx -y lint-staged
+if [ -x "$(/usr/bin/env which nix-shell 2>/dev/null)" ]; then
+  if [ ! "$HOOK_NIX_SHELL" ]; then
+    echo "Nix is available, updating nix flake..."
+    export HOOK_NIX_SHELL=1
+    nix-shell $0
+    exit $?
+  else
+    # run ./nix-update.sh if package lock has changed and has no unstaged changes
+    if [ -n "$(git status --porcelain=v1 2>/dev/null | grep -E '^(M| M) package-lock.json')" ]; then
+      echo "package-lock.json has unstaged changes. Skipping update of nix dependencies."
+    else
+      ./nix-update.sh || exit $?
+    fi
+  fi
+else
+  echo "You do not appear to have nix installed. Skipping update of nix dependencies."
+fi
+
+npx -y lint-staged
+

nix-update.sh

@@ -1,6 +1,10 @@
 #!/usr/bin/env nix-shell
-#!nix-shell -i "bash -x" -p bash prefetch-npm-deps jq
+#!nix-shell -i "bash -x" -p bash prefetch-npm-deps jq git nix-output-monitor
+nix flake update
 DEPS_HASH=`prefetch-npm-deps package-lock.json`
 TMPFILE=$(mktemp)
 jq '.npm_deps_hash = "'$DEPS_HASH'"' hashes.json > $TMPFILE
-mv -- "$TMPFILE" hashes.json
+mv -- "$TMPFILE" hashes.json
+
+nom build .# || exit $?
+git add hashes.json flake.lock flake.nix