add option --report-by-task

bin/common/parse-cli-args.js

@@ -135,6 +135,10 @@ function parseCLIArgsCore(set, args) {    // eslint-disable-line complexity
                 set.continueOnError = true
                 break
 
+            case "--report-by-task":
+                set.reportByTask = true
+                break
+
             case "-l":
             case "--print-label":
                 set.printLabel = true

bin/npm-run-all/main.js

@@ -44,6 +44,7 @@ module.exports = function npmRunAll(args, stdout, stderr) {
                         parallel: group.parallel,
                         maxParallel: group.parallel ? argv.maxParallel : 1,
                         continueOnError: argv.continueOnError,
+                        reportByTask: argv.reportByTask,
                         printLabel: argv.printLabel,
                         printName: argv.printName,
                         config: argv.config,

lib/create-task-streams.js

@@ -0,0 +1,34 @@
+/**
+ * @module create-task-streams
+ * See LICENSE file in root directory for full license.
+ */
+"use strict"
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const createWriteStream = require("fs").createWriteStream
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * Creates output and error stream for a task
+ *
+ * @param {string} fileName - fileName
+ * @returns {object} streams outStream errStream
+ */
+module.exports = function createTaskStreams(fileName) {
+    if (!fileName) {
+        return undefined
+    }
+
+    const sanitizedFileName = fileName.replace(/\W/g, "_")
+
+    const outStream = createWriteStream(`${sanitizedFileName}.out`)
+    const errStream = createWriteStream(`${sanitizedFileName}.err`)
+
+    return { outStream, errStream }
+}

lib/index.js

@@ -219,6 +219,7 @@ module.exports = function npmRunAll(patternOrPatterns, options) { //eslint-disab
     const parallel = Boolean(options && options.parallel)
     const silent = Boolean(options && options.silent)
     const continueOnError = Boolean(options && options.continueOnError)
+    const reportByTask = Boolean(options && options.reportByTask)
     const printLabel = Boolean(options && options.printLabel)
     const printName = Boolean(options && options.printName)
     const race = Boolean(options && options.race)
@@ -266,6 +267,7 @@ module.exports = function npmRunAll(patternOrPatterns, options) { //eslint-disab
                     stderr,
                     prefixOptions,
                     continueOnError,
+                    reportByTask,
                     labelState: {
                         enabled: printLabel,
                         width: labelWidth,

lib/run-task.js

@@ -15,6 +15,7 @@ const chalk = require("chalk")
 const parseArgs = require("shell-quote").parse
 const padEnd = require("string.prototype.padend")
 const createHeader = require("./create-header")
+const createTaskStreams = require("./create-task-streams")
 const createPrefixTransform = require("./create-prefix-transform-stream")
 const spawn = require("./spawn")
 
@@ -142,7 +143,19 @@ module.exports = function runTask(task, options) {
         const stdinKind = detectStreamKind(stdin, process.stdin)
         const stdoutKind = detectStreamKind(stdout, process.stdout)
         const stderrKind = detectStreamKind(stderr, process.stderr)
-        const spawnOptions = { stdio: [stdinKind, stdoutKind, stderrKind] }
+        let spawnOutKind = stdoutKind
+        let spawnErrKind = stderrKind
+
+        let childStreams = undefined
+        if (options.reportByTask) {
+            childStreams = createTaskStreams(task)
+            if (childStreams) {
+                spawnOutKind = "pipe"
+                spawnErrKind = "pipe"
+            }
+        }
+
+        const spawnOptions = { stdio: [stdinKind, spawnOutKind, spawnErrKind] }
 
         // Print task name.
         if (options.printName && stdout != null) {
@@ -177,11 +190,17 @@ module.exports = function runTask(task, options) {
         if (stdinKind === "pipe") {
             stdin.pipe(cp.stdin)
         }
-        if (stdoutKind === "pipe") {
+        if (spawnOutKind === "pipe") {
             cp.stdout.pipe(stdout, { end: false })
+            if (childStreams) {
+                cp.stdout.pipe(childStreams.outStream)
+            }
         }
-        if (stderrKind === "pipe") {
+        if (spawnErrKind === "pipe") {
             cp.stderr.pipe(stderr, { end: false })
+            if (childStreams) {
+                cp.stderr.pipe(childStreams.errStream)
+            }
         }
 
         // Register