forked from extern/nushell
120 lines
3.6 KiB
Rust
120 lines
3.6 KiB
Rust
use crate::prelude::*;
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use indexmap::indexmap;
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use nu_engine::WholeStreamCommand;
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use nu_errors::ShellError;
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use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
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use nu_source::Tagged;
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pub struct Rename;
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#[derive(Deserialize)]
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pub struct Arguments {
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column_name: Tagged<String>,
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rest: Vec<Tagged<String>>,
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}
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impl WholeStreamCommand for Rename {
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fn name(&self) -> &str {
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"rename"
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}
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fn signature(&self) -> Signature {
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Signature::build("rename")
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.required(
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"column_name",
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SyntaxShape::String,
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"the new name for the first column",
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)
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.rest(SyntaxShape::String, "the new name for additional columns")
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}
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fn usage(&self) -> &str {
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"Creates a new table with columns renamed."
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}
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fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
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rename(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: "Rename a column",
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example: "echo [[a, b]; [1, 2]] | rename my_column",
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result: Some(vec![UntaggedValue::row(indexmap! {
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"my_column".to_string() => UntaggedValue::int(1).into(),
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"b".to_string() => UntaggedValue::int(2).into(),
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})
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.into()]),
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},
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Example {
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description: "Rename many columns",
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example: "echo [[a, b, c]; [1, 2, 3]] | rename eggs ham bacon",
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result: Some(vec![UntaggedValue::row(indexmap! {
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"eggs".to_string() => UntaggedValue::int(1).into(),
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"ham".to_string() => UntaggedValue::int(2).into(),
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"bacon".to_string() => UntaggedValue::int(3).into(),
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})
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.into()]),
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},
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]
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}
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}
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pub fn rename(args: CommandArgs) -> Result<OutputStream, ShellError> {
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let name = args.call_info.name_tag.clone();
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let (Arguments { column_name, rest }, input) = args.process()?;
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let mut new_column_names = vec![vec![column_name]];
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new_column_names.push(rest);
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let new_column_names = new_column_names.into_iter().flatten().collect::<Vec<_>>();
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Ok(input
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.map(move |item| {
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if let Value {
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value: UntaggedValue::Row(row),
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tag,
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} = item
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{
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let mut renamed_row = IndexMap::new();
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for (idx, (key, value)) in row.entries.iter().enumerate() {
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let key = if idx < new_column_names.len() {
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&new_column_names[idx].item
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} else {
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key
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};
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renamed_row.insert(key.clone(), value.clone());
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}
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let out = UntaggedValue::Row(renamed_row.into()).into_value(tag);
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ReturnSuccess::value(out)
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} else {
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ReturnSuccess::value(
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UntaggedValue::Error(ShellError::labeled_error(
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"no column names available",
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"can't rename",
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&name,
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))
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.into_untagged_value(),
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)
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}
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})
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.to_output_stream())
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}
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#[cfg(test)]
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mod tests {
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use super::Rename;
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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(Rename {})
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}
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}
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