forked from extern/nushell
ca0c6eaf58
with the `help` command to explore and list all commands available. Enter will also try to see if the location to be entered is an existing Nu command, if it is it will let you inspect the command under `help`. This provides baseline needed so we can iterate on it.
72 lines
2.0 KiB
Rust
72 lines
2.0 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::errors::ShellError;
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use crate::object::{Primitive, Value};
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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 span = args.name_span();
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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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span,
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"value originates from here",
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v.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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