forked from extern/nushell
88 lines
3.2 KiB
Rust
88 lines
3.2 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::errors::ShellError;
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use crate::object::{Primitive, TaggedDictBuilder, Value};
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use crate::prelude::*;
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use log::trace;
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pub struct SplitColumn;
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impl WholeStreamCommand for SplitColumn {
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fn run(
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&self,
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args: CommandArgs,
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registry: &CommandRegistry,
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) -> Result<OutputStream, ShellError> {
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split_column(args, registry)
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}
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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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// TODO: Signature?
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// TODO: Improve error. Old error had extra info:
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//
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// needs parameter (e.g. split-column ",")
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Signature::build("split-column").required("delimeter", SyntaxType::Any)
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}
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}
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fn split_column(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
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let args = args.evaluate_once(registry)?;
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let span = args.name_span();
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let (input, args) = args.parts();
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let positional: Vec<_> = args.positional.iter().flatten().cloned().collect();
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Ok(input
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.values
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.map(move |v| match v.item {
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Value::Primitive(Primitive::String(ref s)) => {
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let splitter = positional[0].as_string().unwrap().replace("\\n", "\n");
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trace!("splitting with {:?}", splitter);
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let split_result: Vec<_> = s.split(&splitter).filter(|s| s.trim() != "").collect();
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trace!("split result = {:?}", split_result);
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// If they didn't provide column names, make up our own
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if (positional.len() - 1) == 0 {
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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(v.clone(), Primitive::String(k.into()));
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}
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ReturnSuccess::value(dict.into_tagged_value())
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} else if split_result.len() == (positional.len() - 1) {
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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().skip(1)) {
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dict.insert(
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v.as_string().unwrap(),
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Value::Primitive(Primitive::String(k.into())),
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);
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}
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ReturnSuccess::value(dict.into_tagged_value())
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} else {
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let mut dict = TaggedDictBuilder::new(v.tag());
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for k in positional.iter().skip(1) {
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dict.insert(k.as_string().unwrap().trim(), Primitive::String("".into()));
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}
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ReturnSuccess::value(dict.into_tagged_value())
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}
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}
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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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span,
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"value originates from here",
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v.span(),
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)),
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})
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.to_output_stream())
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}
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