forked from extern/nushell
82 lines
2.4 KiB
Rust
82 lines
2.4 KiB
Rust
use crate::prelude::*;
|
|
use nu_engine::WholeStreamCommand;
|
|
use nu_errors::ShellError;
|
|
use nu_protocol::{
|
|
dataframe::{Column, NuDataFrame},
|
|
Signature, SyntaxShape, UntaggedValue,
|
|
};
|
|
|
|
use nu_source::Tagged;
|
|
|
|
use super::utils::parse_polars_error;
|
|
pub struct DataFrame;
|
|
|
|
impl WholeStreamCommand for DataFrame {
|
|
fn name(&self) -> &str {
|
|
"dataframe rename-col"
|
|
}
|
|
|
|
fn usage(&self) -> &str {
|
|
"[DataFrame] rename a dataframe column"
|
|
}
|
|
|
|
fn signature(&self) -> Signature {
|
|
Signature::build("dataframe rename-col")
|
|
.required("from", SyntaxShape::String, "column name to be renamed")
|
|
.required("to", SyntaxShape::String, "new column name")
|
|
}
|
|
|
|
fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
|
|
command(args)
|
|
}
|
|
|
|
fn examples(&self) -> Vec<Example> {
|
|
vec![Example {
|
|
description: "Renames a dataframe column",
|
|
example: "[[a b]; [1 2] [3 4]] | dataframe to-df | dataframe rename-col a ab",
|
|
result: Some(vec![NuDataFrame::try_from_columns(
|
|
vec![
|
|
Column::new(
|
|
"ab".to_string(),
|
|
vec![UntaggedValue::int(1).into(), UntaggedValue::int(3).into()],
|
|
),
|
|
Column::new(
|
|
"b".to_string(),
|
|
vec![UntaggedValue::int(2).into(), UntaggedValue::int(4).into()],
|
|
),
|
|
],
|
|
&Span::default(),
|
|
)
|
|
.expect("simple df for test should not fail")
|
|
.into_value(Tag::default())]),
|
|
}]
|
|
}
|
|
}
|
|
|
|
fn command(mut args: CommandArgs) -> Result<OutputStream, ShellError> {
|
|
let tag = args.call_info.name_tag.clone();
|
|
let from: Tagged<String> = args.req(0)?;
|
|
let to: Tagged<String> = args.req(1)?;
|
|
|
|
let (mut df, df_tag) = NuDataFrame::try_from_stream(&mut args.input, &tag.span)?;
|
|
|
|
df.as_mut()
|
|
.rename(from.item.as_str(), to.item.as_str())
|
|
.map_err(|e| parse_polars_error::<&str>(&e, &df_tag.span, None))?;
|
|
|
|
Ok(OutputStream::one(df.into_value(tag)))
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::DataFrame;
|
|
use super::ShellError;
|
|
|
|
#[test]
|
|
fn examples_work_as_expected() -> Result<(), ShellError> {
|
|
use crate::examples::test_dataframe as test_examples;
|
|
|
|
test_examples(DataFrame {})
|
|
}
|
|
}
|