mirror of
https://github.com/nushell/nushell
synced 2025-01-25 19:35:25 +00:00
e4226def16
This commit extracts five new crates:
- nu-source, which contains the core source-code handling logic in Nu,
including Text, Span, and also the pretty.rs-based debug logic
- nu-parser, which is the parser and expander logic
- nu-protocol, which is the bulk of the types and basic conveniences
used by plugins
- nu-errors, which contains ShellError, ParseError and error handling
conveniences
- nu-textview, which is the textview plugin extracted into a crate
One of the major consequences of this refactor is that it's no longer
possible to `impl X for Spanned<Y>` outside of the `nu-source` crate, so
a lot of types became more concrete (Value became a concrete type
instead of Spanned<Value>, for example).
This also turned a number of inherent methods in the main nu crate into
plain functions (impl Value {} became a bunch of functions in the
`value` namespace in `crate::data::value`).
72 lines
2 KiB
Rust
72 lines
2 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::prelude::*;
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use log::trace;
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use nu_errors::ShellError;
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use nu_protocol::{Primitive, ReturnSuccess, Signature, UntaggedValue};
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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 name_span = tag.span;
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let input = args.input;
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let stream = input
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.values
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.map(move |v| match v.value {
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UntaggedValue::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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UntaggedValue::Primitive(Primitive::String(s.into())).into_untagged_value(),
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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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let value_span = v.tag.span;
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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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name_span,
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"value originates from here",
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value_span,
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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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