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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
<!--
Don't forget to add tests that cover your changes.
Make sure you've run and fixed any issues with these commands:
- `cargo fmt --all -- --check` to check standard code formatting (`cargo
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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
automatically
> toolkit check pr
> ```
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# After Submitting
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---------
Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>
94 lines
2.4 KiB
Rust
94 lines
2.4 KiB
Rust
use std::{fs::File, path::PathBuf};
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use nu_engine::CallExt;
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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, Spanned, SyntaxShape, Type, Value,
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};
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use polars::prelude::{IpcWriter, SerWriter};
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use super::super::values::NuDataFrame;
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#[derive(Clone)]
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pub struct ToArrow;
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impl Command for ToArrow {
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fn name(&self) -> &str {
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"dfr to-arrow"
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}
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fn usage(&self) -> &str {
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"Saves dataframe to arrow file."
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}
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fn signature(&self) -> Signature {
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Signature::build(self.name())
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.required("file", SyntaxShape::Filepath, "file path to save dataframe")
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.input_output_type(Type::Custom("dataframe".into()), Type::Any)
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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![Example {
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description: "Saves dataframe to arrow file",
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example: "[[a b]; [1 2] [3 4]] | dfr into-df | dfr to-arrow test.arrow",
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result: None,
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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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command(engine_state, stack, call, input)
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}
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}
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fn command(
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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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let file_name: Spanned<PathBuf> = call.req(engine_state, stack, 0)?;
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let mut df = NuDataFrame::try_from_pipeline(input, call.head)?;
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let mut file = File::create(&file_name.item).map_err(|e| {
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ShellError::GenericError(
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"Error with file name".into(),
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e.to_string(),
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Some(file_name.span),
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None,
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Vec::new(),
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)
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})?;
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IpcWriter::new(&mut file).finish(df.as_mut()).map_err(|e| {
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ShellError::GenericError(
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"Error saving file".into(),
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e.to_string(),
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Some(file_name.span),
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None,
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Vec::new(),
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)
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})?;
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let file_value = Value::String {
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val: format!("saved {:?}", &file_name.item),
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span: file_name.span,
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};
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Ok(PipelineData::Value(
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Value::List {
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vals: vec![file_value],
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span: call.head,
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},
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None,
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))
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}
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