From 3e473b9f37920fdb358d597eaf401d36879debb9 Mon Sep 17 00:00:00 2001
From: Fabian Homborg <FHomborg@gmail.com>
Date: Tue, 13 Apr 2021 10:38:17 +0200
Subject: [PATCH] io: Silence write error with EPIPE

With something like

```
history | head -n 1
```

this would error "write: Broken pipe", which is just annoying. There
is no *problem* here, `head` closes this on purpose.

Fixes #7924.
---
 src/io.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/io.cpp b/src/io.cpp
index 8529a8594..7d291d390 100644
--- a/src/io.cpp
+++ b/src/io.cpp
@@ -306,7 +306,9 @@ void fd_output_stream_t::append(const wchar_t *s, size_t amt) {
     int res = wwrite_to_fd(s, amt, this->fd_);
     if (res < 0) {
         // TODO: this error is too aggressive, e.g. if we got SIGINT we should not complain.
-        wperror(L"write");
+        if (errno != EPIPE) {
+            wperror(L"write");
+        }
         errored_ = true;
     }
 }