add ability to specify stdin file extension via --stdin=ext

cli/help.md

@@ -52,7 +52,8 @@ Basic options:
 --failAfterWarnings         Exit with an error code if there was a warning during the build
 --sourcemapExcludeSources   Do not include source code in source maps
 --sourcemapFile <file>      Specify bundle position for source maps
---no-stdin                  do not read "-" from stdin
+--stdin=ext                 Specify file extension used for stdin input - default is none
+--no-stdin                  Do not read "-" from stdin
 --no-strict                 Don't emit `"use strict";` in the generated modules
 --strictDeprecations        Throw errors for deprecated features
 --systemNullSetters         Replace empty SystemJS setters with `null`

cli/run/commandPlugins.ts

@@ -5,7 +5,7 @@ import { waitForInputPlugin } from './waitForInput';
 
 export function addCommandPluginsToInputOptions(inputOptions: InputOptions, command: any) {
 	if (command.stdin !== false) {
-		inputOptions.plugins!.push(stdinPlugin());
+		inputOptions.plugins!.push(stdinPlugin(command.stdin));
 	}
 	if (command.waitForBundleInput === true) {
 		inputOptions.plugins!.push(waitForInputPlugin());

cli/run/stdin.ts

@@ -4,16 +4,17 @@ export const stdinName = '-';
 
 let stdinResult: Promise<string> | null = null;
 
-export function stdinPlugin(): Plugin {
+export function stdinPlugin(arg: any): Plugin {
+	const suffix = typeof arg == 'string' && arg.length ? '.' + arg : '';
 	return {
 		name: 'stdin',
 		resolveId(id) {
 			if (id === stdinName) {
-				return id;
+				return id + suffix;
 			}
 		},
 		load(id) {
-			if (id === stdinName) {
+			if (id === stdinName || id.startsWith(stdinName + '.')) {
 				return stdinResult || (stdinResult = readStdin());
 			}
 		}

test/cli/samples/stdin/commonjs/_config.js

@@ -0,0 +1,5 @@
+module.exports = {
+	description: 'uses stdin to inline a require()',
+	skipIfWindows: true,
+	command: `echo 'console.log(require("./add.js")(2, 1));' | rollup --stdin=js -p commonjs -f cjs --exports=auto`
+};

test/cli/samples/stdin/commonjs/_expected.js

@@ -0,0 +1,11 @@
+'use strict';
+
+var add = (x, y) => x + y;
+
+console.log(add(2, 1));
+
+var _ = {
+
+};
+
+module.exports = _;

test/cli/samples/stdin/commonjs/add.js

@@ -0,0 +1 @@
+module.exports = (x, y) => x + y;

test/cli/samples/stdin/json/_config.js

@@ -0,0 +1,5 @@
+module.exports = {
+	description: 'pipe JSON over stdin to create a module',
+	skipIfWindows: true,
+	command: `echo '{"foo": 42, "bar": "ok"}' | rollup --stdin=json -p json`
+};

test/cli/samples/stdin/json/_expected.js

@@ -0,0 +1,9 @@
+var foo = 42;
+var bar = "ok";
+var _ = {
+	foo: foo,
+	bar: bar
+};
+
+export default _;
+export { bar, foo };