prevent select (negative number) from hanging shell (#12393)

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# Description
Resolves #11756.
Resolves #12346. 

As per description, shell no longer hangs:
```
~/CodingProjects/nushell> [1 2 3] | select (-2) 
Error: nu:🐚:cant_convert

  × Can't convert to cell path.
   ╭─[entry #1:1:18]
 1 │ [1 2 3] | select (-2)
   ·                  ──┬─
   ·                    ╰── can't convert negative number to cell path
   ╰────
```


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Added relevant test 🚀 

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Possibly support `get` `get`ting negative numbers, as per #12346
discussion. Alternatively, we can consider adding a cellpath for
negative indexing?
This commit is contained in:
pwygab 2024-04-06 22:03:05 +08:00 committed by GitHub
parent ed4927441f
commit 75fedcc8dd
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
2 changed files with 15 additions and 1 deletions

View File

@ -71,7 +71,15 @@ produce a table, a list will produce a list, and a record will produce a record.
};
new_columns.push(cv.clone());
}
Value::Int { val, .. } => {
Value::Int { val, internal_span } => {
if val < 0 {
return Err(ShellError::CantConvert {
to_type: "cell path".into(),
from_type: "negative number".into(),
span: internal_span,
help: None,
});
}
let cv = CellPath {
members: vec![PathMember::Int {
val: val as usize,

View File

@ -275,3 +275,9 @@ fn select_single_row_with_variable() {
assert_eq!(actual.out, "[[a]; [3]]".to_string());
assert!(actual.err.is_empty());
}
#[test]
fn select_with_negative_number_errors_out() {
let actual = nu!("[1 2 3] | select (-2)");
assert!(actual.err.contains("negative number"));
}