forked from extern/nushell
109 lines
3.1 KiB
Rust
109 lines
3.1 KiB
Rust
use crate::commands::from_delimited_data::from_delimited_data;
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use crate::prelude::*;
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use nu_engine::WholeStreamCommand;
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use nu_errors::ShellError;
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use nu_protocol::{Primitive, Signature, SyntaxShape, UntaggedValue, Value};
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pub struct FromCsv;
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impl WholeStreamCommand for FromCsv {
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fn name(&self) -> &str {
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"from csv"
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}
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fn signature(&self) -> Signature {
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Signature::build("from csv")
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.named(
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"separator",
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SyntaxShape::String,
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"a character to separate columns, defaults to ','",
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Some('s'),
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)
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.switch(
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"noheaders",
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"don't treat the first row as column names",
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Some('n'),
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)
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}
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fn usage(&self) -> &str {
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"Parse text as .csv and create table."
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}
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fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
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from_csv(args)
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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: "Convert comma-separated data to a table",
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example: "open data.txt | from csv",
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result: None,
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},
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Example {
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description: "Convert comma-separated data to a table, ignoring headers",
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example: "open data.txt | from csv --noheaders",
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result: None,
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},
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Example {
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description: "Convert comma-separated data to a table, ignoring headers",
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example: "open data.txt | from csv -n",
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result: None,
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},
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Example {
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description: "Convert semicolon-separated data to a table",
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example: "open data.txt | from csv --separator ';'",
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result: None,
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},
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]
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}
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}
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fn from_csv(args: CommandArgs) -> Result<OutputStream, ShellError> {
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let name = args.call_info.name_tag.clone();
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let args = args.evaluate_once()?;
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let noheaders = args.has_flag("noheaders");
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let separator: Option<Value> = args.get_flag("separator")?;
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let input = args.input;
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let sep = match separator {
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Some(Value {
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value: UntaggedValue::Primitive(Primitive::String(s)),
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tag,
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..
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}) => {
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if s == r"\t" {
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'\t'
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} else {
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let vec_s: Vec<char> = s.chars().collect();
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if vec_s.len() != 1 {
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return Err(ShellError::labeled_error(
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"Expected a single separator char from --separator",
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"requires a single character string input",
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tag,
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));
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};
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vec_s[0]
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}
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}
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_ => ',',
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};
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from_delimited_data(noheaders, sep, "CSV", input, name)
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}
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#[cfg(test)]
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mod tests {
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use super::FromCsv;
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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 as test_examples;
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test_examples(FromCsv {})
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}
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}
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