From b172e6f43655fe7d2be5dcab58fc1dff4b4a9d40 Mon Sep 17 00:00:00 2001
From: Rich Trott <rtrott@gmail.com>
Date: Tue, 20 Apr 2021 22:46:42 -0700
Subject: [PATCH] debugger: accommodate line chunking in Windows
MIME-Version: 1.0
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PR-URL: https://github.com/nodejs/node/pull/38161
Backport-PR-URL: https://github.com/nodejs/node/pull/38858
Refs: https://github.com/nodejs/node/discussions/36481
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Jan Krems <jan.krems@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
---
 lib/internal/inspector/_inspect.js     | 43 ++++++++++++++++----------
 lib/internal/inspector/inspect_repl.js | 10 +++---
 2 files changed, 31 insertions(+), 22 deletions(-)

diff --git a/lib/internal/inspector/_inspect.js b/lib/internal/inspector/_inspect.js
index 8bc1f13e5726f0..b58b4b695e8505 100644
--- a/lib/internal/inspector/_inspect.js
+++ b/lib/internal/inspector/_inspect.js
@@ -97,8 +97,8 @@ function runScript(script, scriptArgs, inspectHost, inspectPort, childPrint) {
         const child = spawn(process.execPath, args);
         child.stdout.setEncoding('utf8');
         child.stderr.setEncoding('utf8');
-        child.stdout.on('data', childPrint);
-        child.stderr.on('data', childPrint);
+        child.stdout.on('data', (chunk) => childPrint(chunk, 'stdout'));
+        child.stderr.on('data', (chunk) => childPrint(chunk, 'stderr'));
 
         let output = '';
         function waitForListenHint(text) {
@@ -231,7 +231,7 @@ class NodeInspector {
         return this.client.connect(port, host)
           .then(() => {
             debuglog('connection established');
-            this.stdout.write(' ok');
+            this.stdout.write(' ok\n');
           }, (error) => {
             debuglog('connect failed', error);
             // If it's failed to connect 10 times then print failed message
@@ -245,7 +245,7 @@ class NodeInspector {
           });
       };
 
-      this.print(`connecting to ${host}:${port} ..`, true);
+      this.print(`connecting to ${host}:${port} ..`, false);
       return attemptConnect();
     });
   }
@@ -259,23 +259,32 @@ class NodeInspector {
     }
   }
 
-  print(text, oneline = false) {
+  print(text, appendNewline = false) {
     this.clearLine();
-    this.stdout.write(oneline ? text : `${text}\n`);
+    this.stdout.write(appendNewline ?  `${text}\n` : text);
   }
 
-  childPrint(text) {
-    this.print(
-      text.toString()
-        .split(/\r\n|\r|\n/g)
-        .filter((chunk) => !!chunk)
-        .map((chunk) => `< ${chunk}`)
-        .join('\n')
-    );
-    if (!this.paused) {
-      this.repl.displayPrompt(true);
+  #stdioBuffers = {stdout: '', stderr: ''};
+  childPrint(text, which) {
+    const lines = (this.#stdioBuffers[which] + text)
+      .split(/\r\n|\r|\n/g);
+
+    this.#stdioBuffers[which] = '';
+
+    if (lines[lines.length - 1] !== '') {
+      this.#stdioBuffers[which] = lines.pop();
+    }
+
+    const textToPrint = lines.map((chunk) => `< ${chunk}`).join('\n');
+
+    if (lines.length) {
+      this.print(textToPrint, true);
+      if (!this.paused) {
+        this.repl.displayPrompt(true);
+      }
     }
-    if (/Waiting for the debugger to disconnect\.\.\.\n$/.test(text)) {
+    
+    if (textToPrint.endsWith('Waiting for the debugger to disconnect...\n')) {
       this.killChild();
     }
   }
diff --git a/lib/internal/inspector/inspect_repl.js b/lib/internal/inspector/inspect_repl.js
index 7d5b019e28506d..7fd9772eef733b 100644
--- a/lib/internal/inspector/inspect_repl.js
+++ b/lib/internal/inspector/inspect_repl.js
@@ -320,9 +320,9 @@ function createRepl(inspector) {
     return util.inspect(value, INSPECT_OPTIONS);
   }
 
-  function print(value, oneline = false) {
+  function print(value, addNewline = true) {
     const text = typeof value === 'string' ? value : inspect(value);
-    return inspector.print(text, oneline);
+    return inspector.print(text, addNewline);
   }
 
   function getCurrentLocation() {
@@ -928,13 +928,13 @@ function createRepl(inspector) {
             if (finished) {
               print('Heap snaphost prepared.');
             } else {
-              print(`Heap snapshot: ${done}/${total}`, true);
+              print(`Heap snapshot: ${done}/${total}`, false);
             }
           }
           function onChunk({ chunk }) {
             sizeWritten += chunk.length;
             writer.write(chunk);
-            print(`Writing snapshot: ${sizeWritten}`, true);
+            print(`Writing snapshot: ${sizeWritten}`, false);
           }
           function onResolve() {
             writer.end(() => {
@@ -956,7 +956,7 @@ function createRepl(inspector) {
           HeapProfiler.on('reportHeapSnapshotProgress', onProgress);
           HeapProfiler.on('addHeapSnapshotChunk', onChunk);
 
-          print('Heap snapshot: 0/0', true);
+          print('Heap snapshot: 0/0', false);
           HeapProfiler.takeHeapSnapshot({ reportProgress: true })
             .then(onResolve, onReject);
         });