CLI: Ignore those folders mentioned in the gitignore

* Ignore node_modules and .git folders always.
* Also ignore additional patterns from the .gitignore file, if it exists.

Closes #1384.

src/cli/run.js

@@ -7,8 +7,10 @@ const requireQUnit = require( "./require-qunit" );
 const utils = require( "./utils" );
 
 const IGNORED_GLOBS = [
-	"**/node_modules/**"
-];
+	".git",
+	"node_modules"
+].concat( utils.getIgnoreList( process.cwd() ) );
+
 const RESTART_DEBOUNCE_LENGTH = 200;
 
 let QUnit;

src/cli/utils.js

@@ -12,6 +12,16 @@ function existsStat() {
 	}
 }
 
+
+function getIgnoreList( baseDir ) {
+	const gitFilePath = path.join( baseDir, ".gitignore" );
+	if ( fs.existsSync( gitFilePath ) ) {
+		const gitIgnore = fs.readFileSync( gitFilePath, "utf-8" );
+		return gitIgnore.trim().split( "\n" );
+	}
+	return [];
+}
+
 function findFilesInternal( dir, options, result = [], prefix = "" ) {
 	fs.readdirSync( dir ).forEach( ( name ) => {
 		const fullName = path.join( dir, name );
@@ -85,5 +95,6 @@ module.exports = {
 	findFiles,
 	capitalize,
 	error,
-	getFilesFromArgs
+	getFilesFromArgs,
+	getIgnoreList
 };

test/cli/fixtures/.gitignore

@@ -0,0 +1,2 @@
+/abcd
+/efgh

test/cli/utils.js

@@ -0,0 +1,8 @@
+const { getIgnoreList } = require( "../../src/cli/utils" );
+
+QUnit.module( "getIgnoreList", function() {
+	QUnit.test( "reads .gitignore", function( assert ) {
+		const ignoreList = getIgnoreList( "test/cli/fixtures" );
+		assert.deepEqual( ignoreList, [ "/abcd", "/efgh" ] );
+	} );
+} );