Check all C-family sources with clang-format

Summary:
Add npm-driven clang-format commands for exported C-family sources. Expose `yarn format-cpp` and `yarn format-check-cpp`, and compose them into the repository-wide commands. The wrapper automatically selects the repository-provided formatter for its environment.

Changelog: [Internal]

Differential Revision: D119487611

Author: cortinico

.clang-format-ignore

@@ -1,3 +1,6 @@
+**/Pods/**
+**/build/**
+**/node_modules/**
 packages/react-native/React/I18n/FBXXHashUtils.h
 packages/react-native/ReactAndroid/src/main/jni/first-party/yogajni/**
 packages/react-native/ReactAndroid/src/main/jni/third-party/**

package.json

@@ -9,15 +9,16 @@
     "build-android": "./gradlew :packages:react-native:ReactAndroid:build",
     "build": "node ./scripts/build/build.js",
     "build-types": "node ./scripts/js-api/build-types",
-    "clang-format": "node ./scripts/clang-format.js",
     "clean": "node ./scripts/build/clean.js",
     "cxx-api-build": "python -m scripts.cxx-api.parser",
     "cxx-api-validate": "python -m scripts.cxx-api.parser --validate",
     "flow-check": "flow full-check",
     "flow": "flow",
-    "format-check": "yarn format-check-javascript",
+    "format-check": "yarn format-check-javascript && yarn format-check-cpp",
+    "format-check-cpp": "node ./scripts/clang-format.js --check",
     "format-check-javascript": "prettier --check \"./**/*.{cjs,cts,flow,js,jsx,md,mjs,mts,ts,tsx,yaml,yml}\"",
-    "format": "yarn format-javascript && yarn clang-format",
+    "format": "yarn format-javascript && yarn format-cpp",
+    "format-cpp": "node ./scripts/clang-format.js",
     "format-javascript": "prettier --write \"./**/*.{cjs,cts,flow,js,jsx,md,mjs,mts,ts,tsx,yaml,yml}\"",
     "featureflags": "yarn --cwd packages/react-native featureflags",
     "js-api-diff": "node ./scripts/js-api/diff-api-snapshot",

scripts/clang-format.js

@@ -10,18 +10,49 @@
 
 'use strict';
 
-const dotslash = require('fb-dotslash');
 const {spawnSync} = require('node:child_process');
 const fs = require('node:fs');
 const path = require('node:path');
 const {globSync} = require('tinyglobby');
 
 const REPO_ROOT = path.resolve(__dirname, '..');
-const CLANG_FORMAT = path.join(__dirname, 'clang-format');
+const OSS_CLANG_FORMAT_DOTSLASH = path.join(__dirname, 'clang-format');
 const GENERATED_MARKER = Buffer.from('@' + 'generated');
+const IGNORE_FILE = path.join(REPO_ROOT, '.clang-format-ignore');
 const MAX_HEADER_BYTES = 4096;
 const MAX_FILES_PER_PROCESS = 30;
 
+const SOURCE_GLOB = '**/*.{c,cc,cpp,cu,cuh,cxx,h,hh,hpp,hxx,m,mm,proto,tcc}';
+
+function findClangFormat() {
+  if (process.env.CLANG_FORMAT != null && process.env.CLANG_FORMAT !== '') {
+    return {command: process.env.CLANG_FORMAT, prefixArguments: []};
+  }
+
+  try {
+    const metaClangFormat = require('./clang-format.fb').findMetaClangFormat();
+    if (metaClangFormat != null) {
+      return metaClangFormat;
+    }
+  } catch (error) {
+    if (
+      error == null ||
+      error.code !== 'MODULE_NOT_FOUND' ||
+      !String(error.message).includes("'./clang-format.fb'")
+    ) {
+      throw error;
+    }
+  }
+
+  return {
+    command:
+      process.env.DOTSLASH != null && process.env.DOTSLASH !== ''
+        ? process.env.DOTSLASH
+        : require('fb-dotslash'),
+    prefixArguments: [OSS_CLANG_FORMAT_DOTSLASH],
+  };
+}
+
 /** @param {string} file */
 function isGenerated(file) {
   let fd;
@@ -41,16 +72,33 @@ function isGenerated(file) {
 }
 
 function main() {
+  const arguments_ = process.argv.slice(2);
+  const check = arguments_.includes('--check');
+  const clangFormat = findClangFormat();
+  const positionalArguments = arguments_.filter(
+    argument => argument !== '--check',
+  );
+  const ignore = fs
+    .readFileSync(IGNORE_FILE, 'utf8')
+    .split('\n')
+    .map(line => line.trim())
+    .filter(line => line !== '' && !line.startsWith('#'));
+  const discoveredFiles = globSync(SOURCE_GLOB, {cwd: REPO_ROOT, ignore});
   const files =
-    process.argv.length > 2
-      ? process.argv.slice(2)
-      : globSync('*/**/*.{h,cpp,m,mm}', {cwd: REPO_ROOT});
+    positionalArguments.length > 0
+      ? positionalArguments.filter(file => discoveredFiles.includes(file))
+      : discoveredFiles;
   const sourceFiles = files.filter(file => !isGenerated(file));
+  let exitStatus = 0;
 
   for (let i = 0; i < sourceFiles.length; i += MAX_FILES_PER_PROCESS) {
+    const formatterArguments = [
+      ...(check ? ['--dry-run', '--Werror'] : ['-i']),
+      ...sourceFiles.slice(i, i + MAX_FILES_PER_PROCESS),
+    ];
     const result = spawnSync(
-      dotslash,
-      [CLANG_FORMAT, '-i', ...sourceFiles.slice(i, i + MAX_FILES_PER_PROCESS)],
+      clangFormat.command,
+      [...clangFormat.prefixArguments, ...formatterArguments],
       {
         cwd: REPO_ROOT,
         stdio: 'inherit',
@@ -61,13 +109,13 @@ function main() {
       throw result.error;
     }
     if (result.signal != null) {
-      process.kill(process.pid, result.signal);
-      return;
+      throw new Error(`clang-format was terminated by ${result.signal}`);
     }
     if (result.status !== 0) {
-      process.exit(result.status ?? 1);
+      exitStatus = result.status ?? 1;
     }
   }
+  process.exitCode = exitStatus;
 }
 
 main();