Improve error handling of streams

index.js

@@ -128,21 +128,24 @@ function getStream(process, stream, {encoding, buffer, maxBuffer}) {
 		ret = _getStream.buffer(process[stream], {maxBuffer});
 	}
 
+	if (stream === 'all') {
+		return ret.catch(() => {});
+	}
+
 	return ret.catch(error => {
 		error.stream = stream;
-		error.message = `${stream} ${error.message}`;
 		throw error;
 	});
 }
 
 function makeError(result, options) {
 	const {stdout, stderr, signal} = result;
-	let {error} = result;
-	const {code, joinedCommand, timedOut, isCanceled, killed, parsed: {options: {timeout}}} = options;
+	let {error, error: {stream} = {}} = result;
+	const {code, joinedCommand, timedOut, isCanceled, killed, parsed, parsed: {options: {timeout}}} = options;
 
 	const [exitCodeName, exitCode] = getCode(result, code);
 
-	const prefix = getErrorPrefix({timedOut, timeout, signal, exitCodeName, exitCode, isCanceled});
+	const prefix = getErrorPrefix({timedOut, timeout, signal, exitCodeName, exitCode, isCanceled, stream});
 	const message = `Command ${prefix}: ${joinedCommand}`;
 
 	if (error instanceof Error) {
@@ -162,6 +165,11 @@ function makeError(result, options) {
 		error.all = result.all;
 	}
 
+	if (stream !== undefined && error.bufferedData) {
+		error[stream] = handleOutput(parsed.options, error.bufferedData);
+		delete error.bufferedData;
+	}
+
 	error.failed = true;
 	error.timedOut = timedOut;
 	error.isCanceled = isCanceled;
@@ -185,7 +193,7 @@ function getCode({error = {}}, code) {
 	return [];
 }
 
-function getErrorPrefix({timedOut, timeout, signal, exitCodeName, exitCode, isCanceled}) {
+function getErrorPrefix({timedOut, timeout, signal, exitCodeName, exitCode, isCanceled, stream}) {
 	if (timedOut) {
 		return `timed out after ${timeout} milliseconds`;
 	}
@@ -198,6 +206,10 @@ function getErrorPrefix({timedOut, timeout, signal, exitCodeName, exitCode, isCa
 		return `was killed with ${signal}`;
 	}
 
+	if (stream !== undefined) {
+		return `'${stream}' error`;
+	}
+
 	if (exitCode !== undefined) {
 		return `failed with exit code ${exitCode} (${exitCodeName})`;
 	}
@@ -303,6 +315,7 @@ const execa = (file, args, options) => {
 
 		if (spawned.stdin) {
 			spawned.stdin.on('error', error => {
+				error.stream = 'stdin';
 				reject(error);
 			});
 		}

test.js

@@ -253,6 +253,12 @@ test('input option can be a Buffer - sync', t => {
 	t.is(stdout, 'testing12');
 });
 
+test('stdin errors are handled', async t => {
+	const child = execa('noop');
+	child.stdin.emit('error', new Error('test'));
+	await t.throwsAsync(child, /Command 'stdin' error.*\ntest/);
+});
+
 test('child process errors are handled', async t => {
 	const child = execa('noop');
 	child.emit('error', new Error('test'));
@@ -301,13 +307,15 @@ test('child_process.spawnSync() errors are propagated', t => {
 });
 
 test('maxBuffer affects stdout', async t => {
-	await t.throwsAsync(execa('max-buffer', ['stdout', '11'], {maxBuffer: 10}), /stdout maxBuffer exceeded/);
 	await t.notThrowsAsync(execa('max-buffer', ['stdout', '10'], {maxBuffer: 10}));
+	const {stdout} = await t.throwsAsync(execa('max-buffer', ['stdout', '11'], {maxBuffer: 10}), /max-buffer stdout/);
+	t.is(stdout, '.'.repeat(10));
 });
 
 test('maxBuffer affects stderr', async t => {
-	await t.throwsAsync(execa('max-buffer', ['stderr', '13'], {maxBuffer: 12}), /stderr maxBuffer exceeded/);
-	await t.notThrowsAsync(execa('max-buffer', ['stderr', '12'], {maxBuffer: 12}));
+	await t.notThrowsAsync(execa('max-buffer', ['stderr', '10'], {maxBuffer: 10}));
+	const {stderr} = await t.throwsAsync(execa('max-buffer', ['stderr', '11'], {maxBuffer: 10}), /max-buffer stderr/);
+	t.is(stderr, '.'.repeat(10));
 });
 
 test('do not buffer stdout when `buffer` set to `false`', async t => {