a95a4505ef
# Description Replace `.to_string()` used in `GenericError` with `.into()` as `.into()` seems more popular Replace `Vec::new()` used in `GenericError` with `vec![]` as `vec![]` seems more popular (There are so, so many)
87 lines
2.4 KiB
Rust
87 lines
2.4 KiB
Rust
use std::{fs::File, io::BufWriter, 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::{JsonWriter, SerWriter};
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use super::super::values::NuDataFrame;
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#[derive(Clone)]
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pub struct ToJsonLines;
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impl Command for ToJsonLines {
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fn name(&self) -> &str {
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"dfr to-jsonl"
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}
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fn usage(&self) -> &str {
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"Saves dataframe to a JSON lines 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 JSON lines file",
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example: "[[a b]; [1 2] [3 4]] | dfr into-df | dfr to-jsonl test.jsonl",
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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 file = File::create(&file_name.item).map_err(|e| ShellError::GenericError {
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error: "Error with file name".into(),
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msg: e.to_string(),
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span: Some(file_name.span),
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help: None,
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inner: vec![],
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})?;
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let buf_writer = BufWriter::new(file);
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JsonWriter::new(buf_writer)
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.finish(df.as_mut())
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.map_err(|e| ShellError::GenericError {
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error: "Error saving file".into(),
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msg: e.to_string(),
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span: Some(file_name.span),
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help: None,
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inner: vec![],
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})?;
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let file_value = Value::string(format!("saved {:?}", &file_name.item), file_name.span);
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Ok(PipelineData::Value(
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Value::list(vec![file_value], call.head),
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None,
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))
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}
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