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save: print to stderr for bytestream (#13422)

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# Description
Fixes: #13260 

When user run a command like this:
```nushell
$env.FOO = " New";
$env.BAZ = " New Err";
do -i {nu -n -c 'nu --testbin echo_env FOO; nu --testbin echo_env_stderr BAZ'} | save -a -r save_test_22/log.txt
```

`save` command sinks the output of previous commands' stderr output. I
think it should be `stderr`.

# User-Facing Changes
```nushell
$env.FOO = " New";
$env.BAZ = " New Err";
do -i {nu -n -c 'nu --testbin echo_env FOO; nu --testbin echo_env_stderr BAZ'} | save -a -r save_test_22/log.txt
```
The command will output ` New Err` to stderr.

# Tests + Formatting
Added 2 cases.
This commit is contained in:
Wind
2024-08-01 00:19:35 +08:00
committed by GitHub
parent d880241102
commit 928c57db41
2 changed files with 66 additions and 2 deletions
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6
crates/nu-command/src/filesystem/save.rs
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@ -121,9 +121,11 @@ impl Command for Save {
} else {
match stderr {
ChildPipe::Pipe(mut pipe) => {
io::copy(&mut pipe, &mut io::sink())
io::copy(&mut pipe, &mut io::stderr())
}
ChildPipe::Tee(mut tee) => {
io::copy(&mut tee, &mut io::stderr())
}
ChildPipe::Tee(mut tee) => io::copy(&mut tee, &mut io::sink()),
}
.err_span(span)?;
}