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Make group-by return errors in closure (#12508)

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# Description
When a closure if provided to `group-by`, errors that occur in the
closure are currently ignored. That is, `group-by` will fall back and
use the `"error"` key if an error occurs. For example, the code snippet
below will group all `ls` entries under the `"error"` column.
```nushell
ls | group-by { get nope } 
```

This PR changes `group-by` to instead bubble up any errors triggered
inside the closure. In addition, this PR also does some refactoring and
cleanup inside `group-by`.

# User-Facing Changes
Errors are now returned from the closure provided to `group-by` instead
of falling back to the `"error"` group/key.
This commit is contained in:
Ian Manske 2024-04-16 19:52:21 +00:00 committed by GitHub
parent a7a5ec31be
commit cc781a1ecd
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GPG Key ID: B5690EEEBB952194
2 changed files with 76 additions and 132 deletions
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164
crates/nu-command/src/filters/group_by.rs
View File

@ -26,7 +26,6 @@ impl Command for GroupBy {
"grouper", "grouper",
SyntaxShape::OneOf(vec![ SyntaxShape::OneOf(vec![
SyntaxShape::CellPath, SyntaxShape::CellPath,
SyntaxShape::Block,
SyntaxShape::Closure(None), SyntaxShape::Closure(None),
SyntaxShape::Closure(Some(vec![SyntaxShape::Any])), SyntaxShape::Closure(Some(vec![SyntaxShape::Any])),
]), ]),
@ -65,75 +64,54 @@ impl Command for GroupBy {
description: "Group using a block which is evaluated against each input value", description: "Group using a block which is evaluated against each input value",
example: "[foo.txt bar.csv baz.txt] | group-by { path parse | get extension }", example: "[foo.txt bar.csv baz.txt] | group-by { path parse | get extension }",
result: Some(Value::test_record(record! { result: Some(Value::test_record(record! {
"txt" => Value::test_list( "txt" => Value::test_list(vec![
vec![
Value::test_string("foo.txt"), Value::test_string("foo.txt"),
Value::test_string("baz.txt"), Value::test_string("baz.txt"),
], ]),
), "csv" => Value::test_list(vec![Value::test_string("bar.csv")]),
"csv" => Value::test_list(
vec![Value::test_string("bar.csv")],
),
})), })),
}, },
Example { Example {
description: "You can also group by raw values by leaving out the argument", description: "You can also group by raw values by leaving out the argument",
example: "['1' '3' '1' '3' '2' '1' '1'] | group-by", example: "['1' '3' '1' '3' '2' '1' '1'] | group-by",
result: Some(Value::test_record(record! { result: Some(Value::test_record(record! {
"1" => Value::test_list( "1" => Value::test_list(vec![
vec![
Value::test_string("1"), Value::test_string("1"),
Value::test_string("1"), Value::test_string("1"),
Value::test_string("1"), Value::test_string("1"),
Value::test_string("1"), Value::test_string("1"),
], ]),
), "3" => Value::test_list(vec![
"3" => Value::test_list( Value::test_string("3"),
vec![Value::test_string("3"), Value::test_string("3")], Value::test_string("3"),
), ]),
"2" => Value::test_list( "2" => Value::test_list(vec![Value::test_string("2")]),
vec![Value::test_string("2")],
),
})), })),
}, },
Example { Example {
description: "You can also output a table instead of a record", description: "You can also output a table instead of a record",
example: "['1' '3' '1' '3' '2' '1' '1'] | group-by --to-table", example: "['1' '3' '1' '3' '2' '1' '1'] | group-by --to-table",
result: Some(Value::test_list(vec![ result: Some(Value::test_list(vec![
Value::test_record( Value::test_record(record! {
record! {
"group" => Value::test_string("1"), "group" => Value::test_string("1"),
"items" => Value::test_list( "items" => Value::test_list(vec![
vec![
Value::test_string("1"), Value::test_string("1"),
Value::test_string("1"), Value::test_string("1"),
Value::test_string("1"), Value::test_string("1"),
Value::test_string("1"), Value::test_string("1"),
] ]),
) }),
} Value::test_record(record! {
),
Value::test_record(
record! {
"group" => Value::test_string("3"), "group" => Value::test_string("3"),
"items" => Value::test_list( "items" => Value::test_list(vec![
vec![
Value::test_string("3"), Value::test_string("3"),
Value::test_string("3"), Value::test_string("3"),
] ]),
) }),
} Value::test_record(record! {
),
Value::test_record(
record! {
"group" => Value::test_string("2"), "group" => Value::test_string("2"),
"items" => Value::test_list( "items" => Value::test_list(vec![Value::test_string("2")]),
vec![ }),
Value::test_string("2"),
]
)
}
),
])), ])),
}, },
] ]
@ -146,28 +124,23 @@ pub fn group_by(
call: &Call, call: &Call,
input: PipelineData, input: PipelineData,
) -> Result<PipelineData, ShellError> { ) -> Result<PipelineData, ShellError> {
let span = call.head; let head = call.head;
let grouper: Option<Value> = call.opt(engine_state, stack, 0)?; let grouper: Option<Value> = call.opt(engine_state, stack, 0)?;
let values: Vec<Value> = input.into_iter().collect(); let to_table = call.has_flag(engine_state, stack, "to-table")?;
let values: Vec<Value> = input.into_iter().collect();
if values.is_empty() { if values.is_empty() {
return Ok(PipelineData::Value( return Ok(Value::record(Record::new(), head).into_pipeline_data());
Value::record(Record::new(), Span::unknown()),
None,
));
} }
let groups = match grouper { let groups = match grouper {
Some(v) => { Some(grouper) => {
let span = v.span(); let span = grouper.span();
match v { match grouper {
Value::CellPath { val, .. } => group_cell_path(val, values)?, Value::CellPath { val, .. } => group_cell_path(val, values)?,
Value::Block { .. } | Value::Closure { .. } => { Value::Closure { val, .. } => {
let block: Option<Closure> = call.opt(engine_state, stack, 0)?; group_closure(values, span, val, engine_state, stack)?
group_closure(values, span, block, stack, engine_state)?
} }
_ => { _ => {
return Err(ShellError::TypeMismatch { return Err(ShellError::TypeMismatch {
err_message: "unsupported grouper type".to_string(), err_message: "unsupported grouper type".to_string(),
@ -179,44 +152,43 @@ pub fn group_by(
None => group_no_grouper(values)?, None => group_no_grouper(values)?,
}; };
let value = if call.has_flag(engine_state, stack, "to-table")? { let value = if to_table {
groups_to_table(groups, span) groups_to_table(groups, head)
} else { } else {
groups_to_record(groups, span) groups_to_record(groups, head)
}; };
Ok(PipelineData::Value(value, None)) Ok(value.into_pipeline_data())
} }
pub fn group_cell_path( fn group_cell_path(
column_name: CellPath, column_name: CellPath,
values: Vec<Value>, values: Vec<Value>,
) -> Result<IndexMap<String, Vec<Value>>, ShellError> { ) -> Result<IndexMap<String, Vec<Value>>, ShellError> {
let mut groups: IndexMap<String, Vec<Value>> = IndexMap::new(); let mut groups = IndexMap::<_, Vec<_>>::new();
for value in values.into_iter() { for value in values.into_iter() {
let group_key = value let key = value
.clone() .clone()
.follow_cell_path(&column_name.members, false)?; .follow_cell_path(&column_name.members, false)?;
if matches!(group_key, Value::Nothing { .. }) {
if matches!(key, Value::Nothing { .. }) {
continue; // likely the result of a failed optional access, ignore this value continue; // likely the result of a failed optional access, ignore this value
} }
let group_key = group_key.coerce_string()?; let key = key.coerce_string()?;
let group = groups.entry(group_key).or_default(); groups.entry(key).or_default().push(value);
group.push(value);
} }
Ok(groups) Ok(groups)
} }
pub fn group_no_grouper(values: Vec<Value>) -> Result<IndexMap<String, Vec<Value>>, ShellError> { fn group_no_grouper(values: Vec<Value>) -> Result<IndexMap<String, Vec<Value>>, ShellError> {
let mut groups: IndexMap<String, Vec<Value>> = IndexMap::new(); let mut groups = IndexMap::<_, Vec<_>>::new();
for value in values.into_iter() { for value in values.into_iter() {
let group_key = value.coerce_string()?; let key = value.coerce_string()?;
let group = groups.entry(group_key).or_default(); groups.entry(key).or_default().push(value);
group.push(value);
} }
Ok(groups) Ok(groups)
@ -225,53 +197,27 @@ pub fn group_no_grouper(values: Vec<Value>) -> Result<IndexMap<String, Vec<Value
fn group_closure( fn group_closure(
values: Vec<Value>, values: Vec<Value>,
span: Span, span: Span,
block: Option<Closure>, closure: Closure,
stack: &mut Stack,
engine_state: &EngineState, engine_state: &EngineState,
stack: &mut Stack,
) -> Result<IndexMap<String, Vec<Value>>, ShellError> { ) -> Result<IndexMap<String, Vec<Value>>, ShellError> {
let error_key = "error"; let mut groups = IndexMap::<_, Vec<_>>::new();
let mut groups: IndexMap<String, Vec<Value>> = IndexMap::new();
let eval_block = get_eval_block(engine_state); let eval_block = get_eval_block(engine_state);
let block = engine_state.get_block(closure.block_id);
if let Some(capture_block) = &block {
let block = engine_state.get_block(capture_block.block_id);
for value in values { for value in values {
let mut stack = stack.captures_to_stack(capture_block.captures.clone()); let mut stack = stack.captures_to_stack(closure.captures.clone());
let pipeline = eval_block( let key = eval_block(
engine_state, engine_state,
&mut stack, &mut stack,
block, block,
value.clone().into_pipeline_data(), value.clone().into_pipeline_data(),
); )?
.into_value(span)
.coerce_into_string()?;
let group_key = match pipeline { groups.entry(key).or_default().push(value);
Ok(s) => {
let mut s = s.into_iter();
let key = match s.next() {
Some(Value::Error { .. }) | None => error_key.into(),
Some(return_value) => return_value.coerce_into_string()?,
};
if s.next().is_some() {
return Err(ShellError::GenericError {
error: "expected one value from the block".into(),
msg: "requires a table with one value for grouping".into(),
span: Some(span),
help: None,
inner: vec![],
});
}
key
}
Err(_) => error_key.into(),
};
groups.entry(group_key).or_default().push(value);
}
} }
Ok(groups) Ok(groups)

4
crates/nu-command/tests/commands/group_by.rs
View File

@ -53,9 +53,7 @@ fn errors_if_given_unknown_column_name() {
"# "#
))); )));
assert!(actual assert!(actual.err.contains("can't convert list<string> to string"));
.err
.contains("requires a table with one value for grouping"));
} }
#[test] #[test]