133 lines
3.9 KiB
Rust
133 lines
3.9 KiB
Rust
use crate::{
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values::{cant_convert_err, CustomValueSupport, PolarsPluginObject, PolarsPluginType},
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PolarsPlugin,
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};
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use super::super::values::{Column, NuDataFrame, NuExpression};
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use nu_plugin::{EngineInterface, EvaluatedCall, PluginCommand};
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use nu_protocol::{
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Category, Example, LabeledError, PipelineData, ShellError, Signature, Span, Type, Value,
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};
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#[derive(Clone)]
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pub struct NUnique;
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impl PluginCommand for NUnique {
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type Plugin = PolarsPlugin;
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fn name(&self) -> &str {
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"polars n-unique"
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}
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fn usage(&self) -> &str {
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"Counts unique values."
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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_types(vec![
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(
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Type::Custom("expression".into()),
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Type::Custom("expression".into()),
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),
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(
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Type::Custom("dataframe".into()),
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Type::Custom("dataframe".into()),
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),
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])
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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: "Counts unique values",
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example: "[1 1 2 2 3 3 4] | polars into-df | polars n-unique",
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result: Some(
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NuDataFrame::try_from_columns(
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vec![Column::new(
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"count_unique".to_string(),
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vec![Value::test_int(4)],
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)],
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None,
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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: "Creates a is n-unique expression from a column",
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example: "polars col a | polars n-unique",
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result: None,
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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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plugin: &Self::Plugin,
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engine: &EngineInterface,
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call: &EvaluatedCall,
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input: PipelineData,
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) -> Result<PipelineData, LabeledError> {
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let value = input.into_value(call.head);
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match PolarsPluginObject::try_from_value(plugin, &value)? {
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PolarsPluginObject::NuDataFrame(df) => command(plugin, engine, call, df),
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PolarsPluginObject::NuLazyFrame(lazy) => {
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command(plugin, engine, call, lazy.collect(call.head)?)
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}
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PolarsPluginObject::NuExpression(expr) => {
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let expr: NuExpression = expr.into_polars().n_unique().into();
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expr.to_pipeline_data(plugin, engine, call.head)
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}
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_ => Err(cant_convert_err(
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&value,
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&[
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PolarsPluginType::NuDataFrame,
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PolarsPluginType::NuLazyFrame,
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PolarsPluginType::NuExpression,
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],
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)),
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}
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.map_err(LabeledError::from)
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}
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}
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fn command(
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plugin: &PolarsPlugin,
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engine: &EngineInterface,
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call: &EvaluatedCall,
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df: NuDataFrame,
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) -> Result<PipelineData, ShellError> {
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let res = df
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.as_series(call.head)?
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.n_unique()
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.map_err(|e| ShellError::GenericError {
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error: "Error counting unique values".into(),
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msg: e.to_string(),
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span: Some(call.head),
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help: None,
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inner: vec![],
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})?;
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let value = Value::int(res as i64, call.head);
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let df = NuDataFrame::try_from_columns(
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vec![Column::new("count_unique".to_string(), vec![value])],
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None,
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)?;
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df.to_pipeline_data(plugin, engine, call.head)
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}
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#[cfg(test)]
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mod test {
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use super::*;
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use crate::test::test_polars_plugin_command;
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#[test]
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fn test_examples() -> Result<(), ShellError> {
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test_polars_plugin_command(&NUnique)
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}
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}
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