mirror of
https://github.com/nushell/nushell.git
synced 2025-07-08 18:37:07 +02:00
6cdfee3573
# Description As part of the refactor to split spans off of Value, this moves to using helper functions to create values, and using `.span()` instead of matching span out of Value directly. Hoping to get a few more helping hands to finish this, as there are a lot of commands to update :) # User-Facing Changes <!-- List of all changes that impact the user experience here. This helps us keep track of breaking changes. --> # 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 fmt --all` applies these changes) - `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used` to check that you're using the standard code style - `cargo test --workspace` to check that all tests pass (on Windows make sure to [enable developer mode](https://learn.microsoft.com/en-us/windows/apps/get-started/developer-mode-features-and-debugging)) - `cargo run -- -c "use std testing; testing run-tests --path crates/nu-std"` 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 > ``` --> # After Submitting <!-- If your PR had any user-facing changes, update [the documentation](https://github.com/nushell/nushell.github.io) after the PR is merged, if necessary. This will help us keep the docs up to date. --> --------- Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com> Co-authored-by: WindSoilder <windsoilder@outlook.com>
78 lines
1.8 KiB
Rust
78 lines
1.8 KiB
Rust
use super::super::values::NuDataFrame;
|
|
use nu_protocol::{
|
|
ast::Call,
|
|
engine::{Command, EngineState, Stack},
|
|
Category, Example, PipelineData, ShellError, Signature, Span, Type, Value,
|
|
};
|
|
|
|
#[derive(Clone)]
|
|
pub struct ColumnsDF;
|
|
|
|
impl Command for ColumnsDF {
|
|
fn name(&self) -> &str {
|
|
"dfr columns"
|
|
}
|
|
|
|
fn usage(&self) -> &str {
|
|
"Show dataframe columns."
|
|
}
|
|
|
|
fn signature(&self) -> Signature {
|
|
Signature::build(self.name())
|
|
.input_output_type(Type::Custom("dataframe".into()), Type::Any)
|
|
.category(Category::Custom("dataframe".into()))
|
|
}
|
|
|
|
fn examples(&self) -> Vec<Example> {
|
|
vec![Example {
|
|
description: "Dataframe columns",
|
|
example: "[[a b]; [1 2] [3 4]] | dfr into-df | dfr columns",
|
|
result: Some(Value::list(
|
|
vec![Value::test_string("a"), Value::test_string("b")],
|
|
Span::test_data(),
|
|
)),
|
|
}]
|
|
}
|
|
|
|
fn run(
|
|
&self,
|
|
engine_state: &EngineState,
|
|
stack: &mut Stack,
|
|
call: &Call,
|
|
input: PipelineData,
|
|
) -> Result<PipelineData, ShellError> {
|
|
command(engine_state, stack, call, input)
|
|
}
|
|
}
|
|
|
|
fn command(
|
|
_engine_state: &EngineState,
|
|
_stack: &mut Stack,
|
|
call: &Call,
|
|
input: PipelineData,
|
|
) -> Result<PipelineData, ShellError> {
|
|
let df = NuDataFrame::try_from_pipeline(input, call.head)?;
|
|
|
|
let names: Vec<Value> = df
|
|
.as_ref()
|
|
.get_column_names()
|
|
.iter()
|
|
.map(|v| Value::string(*v, call.head))
|
|
.collect();
|
|
|
|
let names = Value::list(names, call.head);
|
|
|
|
Ok(PipelineData::Value(names, None))
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod test {
|
|
use super::super::super::test_dataframe::test_dataframe;
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn test_examples() {
|
|
test_dataframe(vec![Box::new(ColumnsDF {})])
|
|
}
|
|
}
|