Build/Test Tools: Add banner to minified CSS files

Patches occasionally come in on generated files. We should be kind to new contributors and give them a hint that these files are auto generated.

Props drewapicture, samuelsidler, netweb, valendesigns, kpdesign, nacin, jorbin
Fixes #30666


git-svn-id: https://develop.svn.wordpress.org/trunk@41271 602fd350-edb4-49c9-b593-d223f7449a82

Gruntfile.js

@@ -4,6 +4,7 @@ module.exports = function(grunt) {
 		fs = require( 'fs' ),
 		SOURCE_DIR = 'src/',
 		BUILD_DIR = 'build/',
+ 		BANNER_TEXT = '/*! This file is auto-generated */',
 		autoprefixer = require('autoprefixer'),
 		mediaConfig = {},
 		mediaBuilds = ['audiovideo', 'grid', 'models', 'views'];
@@ -59,6 +60,20 @@ module.exports = function(grunt) {
 				]
 			}
 		},
+ 		usebanner: {
+			options: {
+				position: 'top',
+				banner: BANNER_TEXT,
+				linebreak: true,
+			},
+			files: {
+				src: [
+					BUILD_DIR + 'wp-admin/css/*.min.css',
+					BUILD_DIR + 'wp-includes/css/*.min.css',
+					BUILD_DIR + 'wp-admin/css/colors/*/*.css',
+				]
+			}
+		},
 		clean: {
 			all: [BUILD_DIR],
 			dynamic: {
@@ -919,6 +934,7 @@ module.exports = function(grunt) {
 		'concat:emoji',
 		'includes:emoji',
 		'includes:embed',
+		'usebanner',
 		'jsvalidate:build'
 	] );
 

package.json

@@ -14,6 +14,7 @@
   "devDependencies": {
     "autoprefixer": "^6.5.1",
     "grunt": "~0.4.5",
+    "grunt-banner": "^0.6.0",
     "grunt-browserify": "~5.0.0",
     "grunt-contrib-clean": "~1.0.0",
     "grunt-contrib-compress": "~1.3.0",