mirror of
https://github.com/nushell/nushell
synced 2025-01-06 02:09:10 +00:00
193b00764b
* Moves off of draining between filters. Instead, the sink will pull on the stream, and will drain element-wise. This moves the whole stream to being lazy. * Adds ctrl-c support and connects it into some of the key points where we pull on the stream. If a ctrl-c is detect, we immediately halt pulling on the stream and return to the prompt. * Moves away from having a SourceMap where anchor locations are stored. Now AnchorLocation is kept directly in the Tag. * To make this possible, split tag and span. Span is largely used in the parser and is copyable. Tag is now no longer copyable.
71 lines
2 KiB
Rust
71 lines
2 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::data::{Primitive, Value};
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use crate::errors::ShellError;
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use crate::prelude::*;
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use log::trace;
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pub struct Lines;
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impl WholeStreamCommand for Lines {
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fn name(&self) -> &str {
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"lines"
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}
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fn signature(&self) -> Signature {
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Signature::build("lines")
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}
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fn usage(&self) -> &str {
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"Split single string into rows, one per line."
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}
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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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lines(args, registry)
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}
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}
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// TODO: "Amount remaining" wrapper
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fn lines(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
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let args = args.evaluate_once(registry)?;
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let tag = args.name_tag();
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let input = args.input;
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let input: InputStream = trace_stream!(target: "nu::trace_stream::lines", "input" = input);
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let stream = input
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.values
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.map(move |v| match v.item {
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Value::Primitive(Primitive::String(s)) => {
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let split_result: Vec<_> = s.lines().filter(|s| s.trim() != "").collect();
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trace!("split result = {:?}", split_result);
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let mut result = VecDeque::new();
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for s in split_result {
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result.push_back(ReturnSuccess::value(
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Value::Primitive(Primitive::String(s.into())).tagged_unknown(),
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));
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}
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result
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}
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_ => {
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let mut result = VecDeque::new();
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result.push_back(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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&tag,
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"value originates from here",
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v.tag(),
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)));
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result
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}
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})
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.flatten();
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Ok(stream.to_output_stream())
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}
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