Run scalafmt hook through Bazel (#6753)

scripts/pre-commit-gazelle.sh

@@ -4,8 +4,10 @@
 
 set -e
 
+export PATH="/opt/homebrew/bin:/usr/local/bin:$PATH"
+
 # Run gazelle
-bazel run //:gazelle 2>/dev/null
+bazel run //:gazelle
 
 # Check if any BUILD files were modified
 if ! git diff --quiet -- '*.bazel' '**/BUILD' 'WORKSPACE*'; then

scripts/pre-commit-scalafmt.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+# Pre-commit hook wrapper for scalafmt.
+# Runs the repository-pinned scalafmt CLI through Bazel.
+
+set -e
+
+export PATH="/opt/homebrew/bin:/usr/local/bin:$PATH"
+
+if [ "$#" -eq 0 ]; then
+    exit 0
+fi
+
+repo_root="$(git rev-parse --show-toplevel)"
+files=()
+for file in "$@"; do
+    case "$file" in
+        /*) files+=("$file") ;;
+        *) files+=("$repo_root/$file") ;;
+    esac
+done
+
+bazel run //tools:scalafmt -- --config "$repo_root/.scalafmt.conf" -i "${files[@]}"