Run scalafmt hook through Bazel (#6753)

.pre-commit-config.yaml

@@ -35,7 +35,7 @@ repos:
     -   id: scalafmt
         name: scalafmt
         language: system
-        entry: scalafmt -i -f 
+        entry: ./scripts/pre-commit-scalafmt.sh
         types_or: ["scala"]
 - repo: local
   hooks:

MODULE.bazel

@@ -295,6 +295,9 @@ maven.install(
         # Testing
         "org.scalamock:scalamock_3:7.4.1",
 
+        # Developer tools
+        "org.scalameta:scalafmt-cli_2.13:3.9.9",
+
         # AWS SDK
         "software.amazon.awssdk:s3-transfer-manager:%s" % AWS_SDK_VERSION,
         "software.amazon.awssdk:s3:%s" % AWS_SDK_VERSION,

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[@]}"

tools/BUILD.bazel

@@ -72,6 +72,15 @@ declare_deps_provider(
     ],
 )
 
+java_binary(
+    name = "scalafmt",
+    main_class = "org.scalafmt.cli.Cli",
+    visibility = ["//visibility:public"],
+    runtime_deps = [
+        "@maven//:org_scalameta_scalafmt_cli_2_13",
+    ],
+)
+
 declare_deps_provider(
     name = "custom_compile_deps",
     deps_id = "scalapb_compile_deps",