63abe1cb3e
* date and duration from nu * date commands * Import to feature flag * corrected to-csv example * corrected sample example
76 lines
2.1 KiB
Rust
76 lines
2.1 KiB
Rust
use crate::{commands::dataframe::utils::parse_polars_error, prelude::*};
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use nu_engine::WholeStreamCommand;
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use nu_errors::ShellError;
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use nu_protocol::{
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dataframe::{Column, NuDataFrame},
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Signature, UntaggedValue,
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};
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use polars::prelude::IntoSeries;
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pub struct DataFrame;
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impl WholeStreamCommand for DataFrame {
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fn name(&self) -> &str {
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"dataframe get-nanosecond"
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}
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fn usage(&self) -> &str {
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"[Series] Gets nanosecond from date"
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}
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fn signature(&self) -> Signature {
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Signature::build("dataframe get-nanosecond")
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}
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fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
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command(args)
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Returns nanosecond from a date",
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example: r#"let dt = ('2020-08-04T16:39:18+00:00' | str to-datetime -z 'UTC');
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let df = ([$dt $dt] | dataframe to-df);
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$df | dataframe get-nanosecond"#,
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result: Some(vec![NuDataFrame::try_from_columns(
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vec![Column::new(
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"0".to_string(),
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vec![UntaggedValue::int(0).into(), UntaggedValue::int(0).into()],
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)],
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&Span::default(),
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)
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.expect("simple df for test should not fail")
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.into_value(Tag::default())]),
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}]
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}
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}
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fn command(mut args: CommandArgs) -> Result<OutputStream, ShellError> {
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let tag = args.call_info.name_tag.clone();
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let (df, df_tag) = NuDataFrame::try_from_stream(&mut args.input, &tag.span)?;
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let series = df.as_series(&df_tag.span)?;
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let casted = series
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.date64()
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.map_err(|e| parse_polars_error::<&str>(&e, &df_tag.span, None))?;
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let res = casted.nanosecond().into_series();
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let df = NuDataFrame::try_from_series(vec![res], &tag.span)?;
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Ok(OutputStream::one(df.into_value(df_tag)))
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}
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#[cfg(test)]
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mod tests {
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use super::DataFrame;
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use super::ShellError;
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#[test]
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fn examples_work_as_expected() -> Result<(), ShellError> {
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use crate::examples::test_dataframe as test_examples;
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test_examples(DataFrame {})
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}
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}
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