forked from extern/nushell
120 lines
3.7 KiB
Rust
120 lines
3.7 KiB
Rust
use crate::prelude::*;
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use log::trace;
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use nu_engine::WholeStreamCommand;
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use nu_errors::ShellError;
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use nu_protocol::{
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Primitive, ReturnSuccess, Signature, SyntaxShape, TaggedDictBuilder, UntaggedValue,
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};
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use nu_source::Tagged;
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#[derive(Deserialize)]
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struct SplitColumnArgs {
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separator: Tagged<String>,
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rest: Vec<Tagged<String>>,
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#[serde(rename(deserialize = "collapse-empty"))]
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collapse_empty: bool,
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}
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pub struct SubCommand;
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impl WholeStreamCommand for SubCommand {
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fn name(&self) -> &str {
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"split column"
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}
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fn signature(&self) -> Signature {
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Signature::build("split column")
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.required(
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"separator",
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SyntaxShape::Any,
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"the character that denotes what separates columns",
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)
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.switch("collapse-empty", "remove empty columns", Some('c'))
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.rest(SyntaxShape::String, "column names to give the new columns")
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}
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fn usage(&self) -> &str {
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"splits contents across multiple columns via the separator."
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}
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fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
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split_column(args)
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}
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}
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fn split_column(args: CommandArgs) -> Result<OutputStream, ShellError> {
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let name_span = args.call_info.name_tag.span;
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let (
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SplitColumnArgs {
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separator,
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rest,
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collapse_empty,
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},
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input,
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) = args.process()?;
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Ok(input
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.map(move |v| {
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if let Ok(s) = v.as_string() {
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let splitter = separator.replace("\\n", "\n");
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trace!("splitting with {:?}", splitter);
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let split_result: Vec<_> = if collapse_empty {
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s.split(&splitter).filter(|s| !s.is_empty()).collect()
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} else {
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s.split(&splitter).collect()
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};
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trace!("split result = {:?}", split_result);
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let positional: Vec<_> = rest.iter().map(|f| f.item.clone()).collect();
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// If they didn't provide column names, make up our own
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if positional.is_empty() {
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let mut gen_columns = vec![];
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for i in 0..split_result.len() {
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gen_columns.push(format!("Column{}", i + 1));
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}
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let mut dict = TaggedDictBuilder::new(&v.tag);
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for (&k, v) in split_result.iter().zip(gen_columns.iter()) {
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dict.insert_untagged(v.clone(), Primitive::String(k.into()));
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}
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ReturnSuccess::value(dict.into_value())
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} else {
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let mut dict = TaggedDictBuilder::new(&v.tag);
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for (&k, v) in split_result.iter().zip(positional.iter()) {
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dict.insert_untagged(
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v,
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UntaggedValue::Primitive(Primitive::String(k.into())),
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);
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}
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ReturnSuccess::value(dict.into_value())
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}
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} else {
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Err(ShellError::labeled_error_with_secondary(
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"Expected a string from pipeline",
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"requires string input",
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name_span,
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"value originates from here",
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v.tag.span,
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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::ShellError;
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use super::SubCommand;
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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(SubCommand {})
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}
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}
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