nushell/src/commands/from_xlsx.rs

use crate::commands::WholeStreamCommand;
use crate::prelude::*;
use crate::TaggedListBuilder;
use calamine::*;
use nu_errors::ShellError;
use nu_protocol::{Primitive, ReturnSuccess, Signature, TaggedDictBuilder, UntaggedValue, Value};
use std::io::Cursor;

pub struct FromXLSX;

#[derive(Deserialize)]
pub struct FromXLSXArgs {
    headerless: bool,
}

impl WholeStreamCommand for FromXLSX {
    fn name(&self) -> &str {
        "from-xlsx"
    }

    fn signature(&self) -> Signature {
        Signature::build("from-xlsx")
            .switch("headerless", "don't treat the first row as column names")
    }

    fn usage(&self) -> &str {
        "Parse binary Excel(.xlsx) data and create table."
    }

    fn run(
        &self,
        args: CommandArgs,
        registry: &CommandRegistry,
    ) -> Result<OutputStream, ShellError> {
        args.process(registry, from_xlsx)?.run()
    }
}

fn from_xlsx(
    FromXLSXArgs {
        headerless: _headerless,
    }: FromXLSXArgs,
    runnable_context: RunnableContext,
) -> Result<OutputStream, ShellError> {
    let input = runnable_context.input;
    let tag = runnable_context.name;

    let stream = async_stream! {
        let values: Vec<Value> = input.values.collect().await;

        for value in values {
            let value_span = value.tag.span;
            let value_tag = value.tag.clone();

            match value.value {
                UntaggedValue::Primitive(Primitive::Binary(vb)) => {
                    let mut buf: Cursor<Vec<u8>> = Cursor::new(vb);
                    let mut xls = Xlsx::<_>::new(buf).unwrap();

                    let mut dict = TaggedDictBuilder::new(&tag);

                    let sheet_names = xls.sheet_names().to_owned();

                    for sheet_name in &sheet_names {
                        let mut sheet_output = TaggedListBuilder::new(&tag);

                        let current_sheet = xls.worksheet_range(sheet_name).unwrap().unwrap();

                        for row in current_sheet.rows() {
                            let mut row_output = TaggedDictBuilder::new(&tag);
                            for (i, cell) in row.iter().enumerate() {
                                let value = match cell {
                                    DataType::Empty => UntaggedValue::nothing(),
                                    DataType::String(s) => UntaggedValue::string(s),
                                    DataType::Float(f) => UntaggedValue::decimal(*f),
                                    DataType::Int(i) => UntaggedValue::int(*i),
                                    DataType::Bool(b) => UntaggedValue::boolean(*b),
                                    _ => UntaggedValue::nothing(),
                                };

                                row_output.insert_untagged(&format!("Column{}", i), value);
                            }

                            sheet_output.push_untagged(row_output.into_untagged_value());
                        }

                        dict.insert_untagged(sheet_name, sheet_output.into_untagged_value());
                    }

                    yield ReturnSuccess::value(dict.into_value());
                }
                _ => yield Err(ShellError::labeled_error_with_secondary(
                    "Expected binary data from pipeline",
                    "requires binary data input",
                    &tag,
                    "value originates from here",
                    value_tag,
                )),

            }
        }
    };

    Ok(stream.to_output_stream())
}