From 4b71fa248ad07e23a62d1d5811e163113e1baab1 Mon Sep 17 00:00:00 2001
From: Harvey Tindall <hrfee@protonmail.ch>
Date: Fri, 29 Oct 2021 15:07:56 +0100
Subject: [PATCH] Truncate file when directly sharing

Fixes bug where recipient instance would have a bit of the previous
track data on the end of the output if the previous track data was
longer, which effectively froze the output on waybar as it was no longer
valid JSON.
---
 main.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/main.go b/main.go
index 8e7768f..3d3fabb 100644
--- a/main.go
+++ b/main.go
@@ -540,12 +540,17 @@ type emptyEveryWrite struct {
 }
 
 func (w emptyEveryWrite) Write(p []byte) (n int, err error) {
+	n = len(p)
+	// Set new size in case previous data was longer and would leave garbage at the end of the file.
+	err = w.file.Truncate(int64(n))
+	if err != nil {
+		return 0, err
+	}
 	offset, err := w.file.Seek(0, 0)
 	if err != nil {
 		return 0, err
 	}
 	_, err = w.file.WriteAt(p, offset)
-	n = len(p)
 	return
 }