nushell/crates/nu-cli/src/commands/to_csv.rs

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use crate::commands::to_delimited_data::to_delimited_data;
use crate::commands::WholeStreamCommand;
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use crate::prelude::*;
use nu_errors::ShellError;
use nu_protocol::{Primitive, Signature, SyntaxShape, UntaggedValue, Value};
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pub struct ToCSV;
#[derive(Deserialize)]
pub struct ToCSVArgs {
headerless: bool,
separator: Option<Value>,
}
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#[async_trait]
impl WholeStreamCommand for ToCSV {
fn name(&self) -> &str {
"to csv"
}
fn signature(&self) -> Signature {
Signature::build("to csv")
.named(
"separator",
SyntaxShape::String,
"a character to separate columns, defaults to ','",
Some('s'),
)
.switch(
"headerless",
"do not output the columns names as the first row",
None,
)
}
fn usage(&self) -> &str {
"Convert table into .csv text "
}
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async fn run(
&self,
args: CommandArgs,
registry: &CommandRegistry,
) -> Result<OutputStream, ShellError> {
to_csv(args, registry)
}
}
fn to_csv(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
let registry = registry.clone();
let stream = async_stream! {
let name = args.call_info.name_tag.clone();
let (ToCSVArgs { separator, headerless }, mut input) = args.process(&registry).await?;
let sep = match separator {
Some(Value {
value: UntaggedValue::Primitive(Primitive::String(s)),
tag,
..
}) => {
if s == r"\t" {
'\t'
} else {
let vec_s: Vec<char> = s.chars().collect();
if vec_s.len() != 1 {
yield Err(ShellError::labeled_error(
"Expected a single separator char from --separator",
"requires a single character string input",
tag,
));
return;
};
vec_s[0]
}
}
_ => ',',
};
let mut result = to_delimited_data(headerless, sep, "CSV", input, name)?;
while let Some(item) = result.next().await {
yield item;
}
};
Ok(stream.to_output_stream())
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}
#[cfg(test)]
mod tests {
use super::ToCSV;
#[test]
fn examples_work_as_expected() {
use crate::examples::test as test_examples;
test_examples(ToCSV {})
}
}