Merge pull request #246 from rollup/gh-239

support banner and footer options in plugins

src/Bundle.js

@@ -12,6 +12,7 @@ import getIndentString from './utils/getIndentString.js';
 import { unixizePath } from './utils/normalizePlatform.js';
 import transform from './utils/transform.js';
 import collapseSourcemaps from './utils/collapseSourcemaps.js';
+import callIfFunction from './utils/callIfFunction.js';
 
 export default class Bundle {
 	constructor ( options ) {
@@ -207,8 +208,20 @@ export default class Bundle {
 
 		magicString = finalise( this, magicString.trim(), { exportMode, indentString }, options );
 
-		if ( options.banner ) magicString.prepend( options.banner + '\n' );
-		if ( options.footer ) magicString.append( '\n' + options.footer );
+		const banner = [ options.banner ]
+			.concat( this.plugins.map( plugin => plugin.banner ) )
+			.map( callIfFunction )
+			.filter( Boolean )
+			.join( '\n' );
+
+		const footer = [ options.footer ]
+			.concat( this.plugins.map( plugin => plugin.footer ) )
+			.map( callIfFunction )
+			.filter( Boolean )
+			.join( '\n' );
+
+		if ( banner ) magicString.prepend( banner + '\n' );
+		if ( footer ) magicString.append( '\n' + footer );
 
 		const code = magicString.toString();
 		let map = null;

src/utils/callIfFunction.js

@@ -0,0 +1,3 @@
+export default function callIfFunction ( thing ) {
+	return typeof thing === 'function' ? thing() : thing;
+}

test/form/banner-and-footer-plugin/_config.js

@@ -0,0 +1,15 @@
+module.exports = {
+	description: 'allows plugins to set banner and footer options',
+	options: {
+		plugins: [
+			{
+				banner: '/* first banner */',
+				footer: function () { return '/* first footer */'; }
+			},
+			{
+				banner: function () { return '/* second banner */'; },
+				footer: '/* second footer */'
+			}
+		]
+	}
+}

test/form/banner-and-footer-plugin/_expected/amd.js

@@ -0,0 +1,9 @@
+/* first banner */
+/* second banner */
+define(function () { 'use strict';
+
+	console.log( 1 + 1 );
+
+});
+/* first footer */
+/* second footer */

test/form/banner-and-footer-plugin/_expected/cjs.js

@@ -0,0 +1,7 @@
+/* first banner */
+/* second banner */
+'use strict';
+
+console.log( 1 + 1 );
+/* first footer */
+/* second footer */

test/form/banner-and-footer-plugin/_expected/es6.js

@@ -0,0 +1,5 @@
+/* first banner */
+/* second banner */
+console.log( 1 + 1 );
+/* first footer */
+/* second footer */

test/form/banner-and-footer-plugin/_expected/iife.js

@@ -0,0 +1,9 @@
+/* first banner */
+/* second banner */
+(function () { 'use strict';
+
+	console.log( 1 + 1 );
+
+})();
+/* first footer */
+/* second footer */

test/form/banner-and-footer-plugin/_expected/umd.js

@@ -0,0 +1,13 @@
+/* first banner */
+/* second banner */
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
+	typeof define === 'function' && define.amd ? define(factory) :
+	factory();
+}(this, function () { 'use strict';
+
+	console.log( 1 + 1 );
+
+}));
+/* first footer */
+/* second footer */

test/form/banner-and-footer-plugin/main.js

@@ -0,0 +1 @@
+console.log( 1 + 1 );