Lint untracked files with yarn linc (#11665)

* Lint untracked files with yarn linc (#11646)

* Run prettier on untracked files

* Unify code for listing changed files into shared utility

scripts/prettier/index.js

@@ -11,9 +11,9 @@
 
 const chalk = require('chalk');
 const glob = require('glob');
-const execFileSync = require('child_process').execFileSync;
 const prettier = require('prettier');
 const fs = require('fs');
+const listChangedFiles = require('../shared/listChangedFiles');
 
 const mode = process.argv[2] || 'check';
 const shouldWrite = mode === 'write' || mode === 'write-changed';
@@ -56,28 +56,7 @@ const config = {
   },
 };
 
-function exec(command, args) {
-  console.log('> ' + [command].concat(args).join(' '));
-  var options = {
-    cwd: process.cwd(),
-    env: process.env,
-    stdio: 'pipe',
-    encoding: 'utf-8',
-  };
-  return execFileSync(command, args, options);
-}
-
-var mergeBase = exec('git', ['merge-base', 'HEAD', 'master']).trim();
-var changedFiles = new Set(
-  exec('git', [
-    'diff',
-    '-z',
-    '--name-only',
-    '--diff-filter=ACMRTUB',
-    mergeBase,
-  ]).match(/[^\0]+/g)
-);
-
+var changedFiles = listChangedFiles();
 let didWarn = false;
 let didError = false;
 Object.keys(config).forEach(key => {

scripts/shared/listChangedFiles.js

@@ -0,0 +1,36 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+'use strict';
+
+const execFileSync = require('child_process').execFileSync;
+
+const exec = (command, args) => {
+  console.log('> ' + [command].concat(args).join(' '));
+  var options = {
+    cwd: process.cwd(),
+    env: process.env,
+    stdio: 'pipe',
+    encoding: 'utf-8',
+  };
+  return execFileSync(command, args, options);
+};
+const execGitCmd = args =>
+  exec('git', args)
+    .trim()
+    .toString()
+    .split('\n');
+
+const mergeBase = execGitCmd(['merge-base', 'HEAD', 'master']);
+
+const listChangedFiles = () => {
+  return new Set([
+    ...execGitCmd(['diff', '--name-only', '--diff-filter=ACMRTUB', mergeBase]),
+    ...execGitCmd(['ls-files', '--others', '--exclude-standard']),
+  ]);
+};
+
+module.exports = listChangedFiles;

scripts/tasks/linc.js

@@ -8,22 +8,9 @@
 'use strict';
 
 const lintOnFiles = require('../eslint');
-const execFileSync = require('child_process').execFileSync;
-const mergeBase = execFileSync('git', ['merge-base', 'HEAD', 'master'], {
-  stdio: 'pipe',
-  encoding: 'utf-8',
-}).trim();
-const changedFiles = execFileSync(
-  'git',
-  ['diff', '--name-only', '--diff-filter=ACMRTUB', mergeBase],
-  {
-    stdio: 'pipe',
-    encoding: 'utf-8',
-  }
-)
-  .trim()
-  .toString()
-  .split('\n');
+const listChangedFiles = require('../shared/listChangedFiles');
+
+const changedFiles = [...listChangedFiles()];
 const jsFiles = changedFiles.filter(file => file.match(/.js$/g));
 
 const report = lintOnFiles(jsFiles);