From f5810319fbbb0e01900ae9e26efab2dad86cee3b Mon Sep 17 00:00:00 2001
From: Teppo Kurki <teppo.kurki@iki.fi>
Date: Mon, 10 Feb 2025 18:59:30 +0200
Subject: [PATCH] fix: multiplexed playback with empty lines (#1884)

Encountered a multiplexed log file with empty line in the
beginning. Fix by skipping empty lines until we see a line
that we can recognize.
---
 packages/streams/autodetect.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/streams/autodetect.js b/packages/streams/autodetect.js
index 5acca252a..87421f5ef 100644
--- a/packages/streams/autodetect.js
+++ b/packages/streams/autodetect.js
@@ -143,6 +143,12 @@ require('util').inherits(ToTimestamped, Transform)
 // runs only once, self-assigns the actual transform functions
 // on first call
 ToTimestamped.prototype._transform = function (msg, encoding, done) {
+  //ignore empty lines in the beginning of the file, encountered in some cases
+  if (msg.trim().length === 0) {
+    done()
+    return
+  }
+
   const line = msg.toString()
   this.multiplexedFormat =
     line.length > 16 && line.charAt(13) === ';' && line.split(';').length >= 3