forked from extern/nushell
9068093081
# Description
This PR does a few things to help improve type hovers and, in the
process, fixes a few outstanding issues in the type system. Here's a
list of the changes:
* `for` now will try to infer the type of the iteration variable based
on the expression it's given. This fixes things like `for x in [1, 2, 3]
{ }` where `x` now properly gets the int type.
* Removed old input/output type fields from the signature, focuses on
the vec of signatures. Updated a bunch of dataframe commands that hadn't
moved over. This helps tie things together a bit better
* Fixed inference of types from subexpressions to use the last
expression in the block
* Fixed handling of explicit types in `let` and `mut` calls, so we now
respect that as the authoritative type
I also tried to add `def` input/output type inference, but unfortunately
we only know the predecl types universally, which means we won't have
enough information to properly know what the types of the custom
commands are.
# User-Facing Changes
Script typechecking will get tighter in some cases
Hovers should be more accurate in some cases that previously resorted to
any.
# Tests + Formatting
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Make sure you've run and fixed any issues with these commands:
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clippy::needless_collect -A clippy::result_large_err` to check that
you're using the standard code style
- `cargo test --workspace` to check that all tests pass
- `cargo run -- crates/nu-std/tests/run.nu` to run the tests for the
standard library
> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
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> toolkit check pr
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# After Submitting
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---------
Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>
130 lines
4.5 KiB
Rust
130 lines
4.5 KiB
Rust
use super::super::values::{Column, NuDataFrame};
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use nu_protocol::{
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ast::Call,
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engine::{Command, EngineState, Stack},
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Category, Example, PipelineData, ShellError, Signature, Span, Type, Value,
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};
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#[derive(Clone)]
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pub struct ToDataFrame;
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impl Command for ToDataFrame {
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fn name(&self) -> &str {
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"dfr into-df"
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}
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fn usage(&self) -> &str {
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"Converts a list, table or record into a dataframe."
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}
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fn signature(&self) -> Signature {
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Signature::build(self.name())
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.input_output_type(Type::Any, Type::Custom("dataframe".into()))
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.category(Category::Custom("dataframe".into()))
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}
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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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description: "Takes a dictionary and creates a dataframe",
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example: "[[a b];[1 2] [3 4]] | dfr into-df",
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result: Some(
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NuDataFrame::try_from_columns(vec![
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Column::new(
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"a".to_string(),
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vec![Value::test_int(1), Value::test_int(3)],
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),
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Column::new(
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"b".to_string(),
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vec![Value::test_int(2), Value::test_int(4)],
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),
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])
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.expect("simple df for test should not fail")
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.into_value(Span::test_data()),
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),
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},
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Example {
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description: "Takes a list of tables and creates a dataframe",
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example: "[[1 2 a] [3 4 b] [5 6 c]] | dfr into-df",
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result: Some(
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NuDataFrame::try_from_columns(vec![
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Column::new(
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"0".to_string(),
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vec![Value::test_int(1), Value::test_int(3), Value::test_int(5)],
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),
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Column::new(
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"1".to_string(),
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vec![Value::test_int(2), Value::test_int(4), Value::test_int(6)],
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),
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Column::new(
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"2".to_string(),
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vec![
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Value::test_string("a"),
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Value::test_string("b"),
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Value::test_string("c"),
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],
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),
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])
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.expect("simple df for test should not fail")
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.into_value(Span::test_data()),
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),
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},
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Example {
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description: "Takes a list and creates a dataframe",
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example: "[a b c] | dfr into-df",
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result: Some(
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NuDataFrame::try_from_columns(vec![Column::new(
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"0".to_string(),
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vec![
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Value::test_string("a"),
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Value::test_string("b"),
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Value::test_string("c"),
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],
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)])
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.expect("simple df for test should not fail")
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.into_value(Span::test_data()),
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),
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},
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Example {
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description: "Takes a list of booleans and creates a dataframe",
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example: "[true true false] | dfr into-df",
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result: Some(
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NuDataFrame::try_from_columns(vec![Column::new(
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"0".to_string(),
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vec![
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Value::test_bool(true),
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Value::test_bool(true),
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Value::test_bool(false),
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],
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)])
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.expect("simple df for test should not fail")
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.into_value(Span::test_data()),
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),
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},
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]
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}
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fn run(
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&self,
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_engine_state: &EngineState,
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_stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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NuDataFrame::try_from_iter(input.into_iter())
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.map(|df| PipelineData::Value(NuDataFrame::into_value(df, call.head), None))
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}
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}
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#[cfg(test)]
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mod test {
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use super::super::super::test_dataframe::test_dataframe;
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use super::*;
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#[test]
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fn test_examples() {
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test_dataframe(vec![Box::new(ToDataFrame {})])
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}
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}
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