gum spin full command output is printed if no tty

[vt-alt]

Description

$ gum spin --show-error date
$ gum spin --show-error date | cat
Thu Jan 29 05:25:28 AM UTC 2026

This is unexpected behavior, as the script which works quietly on tty produces a lot of (not needed) output if redirected to a file, and there is not way to disable it. For example we run make build command, it is quiet if script is on tty, but a lot of text if redirected.

It is possible to redirect gum spin output to /dev/null, but stderr output is still visible and it sometimes interferes incorrectly with the rest of output:

$ gum spin --title='aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa' -- bash -c 'sleep 1; date >&2' >/dev/null
Thu Jan 29 08:38:40 AM MSK 2026aaaaaaaaaaaaaaaaa

And there is no output if no >/dev/null redirect.

Additionally, as feature request, I would suggest option which prints --title line once if output is not tty (without repeating). This will make output similar nevertheless tty or not.

Version

0.17.0

Environment

linux