forked from extern/nushell
522a828687
* Refactor InputStream and affected commands. First, making `values` private and leaning on the `Stream` implementation makes consumes of `InputStream` less likely to have to change in the future, if we change what an `InputStream` is internally. Second, we're dropping `Option<InputStream>` as the input to pipelines, internals, and externals. Instead, `InputStream.is_empty` can be used to check for "emptiness". Empty streams are typically only ever used as the first input to a pipeline. * Add run_external internal command. We want to push external commands closer to internal commands, eventually eliminating the concept of "external" completely. This means we can consolidate a couple of things: - Variable evaluation (for example, `$it`, `$nu`, alias vars) - Behaviour of whole stream vs per-item external execution It should also make it easier for us to start introducing argument signatures for external commands, * Update run_external.rs * Update run_external.rs * Update run_external.rs * Update run_external.rs Co-authored-by: Jonathan Turner <jonathandturner@users.noreply.github.com>
55 lines
1.3 KiB
Rust
55 lines
1.3 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::data::base::reject_fields;
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use crate::prelude::*;
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use nu_errors::ShellError;
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use nu_protocol::{Signature, SyntaxShape};
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use nu_source::Tagged;
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#[derive(Deserialize)]
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pub struct RejectArgs {
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rest: Vec<Tagged<String>>,
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}
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pub struct Reject;
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impl WholeStreamCommand for Reject {
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fn name(&self) -> &str {
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"reject"
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}
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fn signature(&self) -> Signature {
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Signature::build("reject").rest(SyntaxShape::String, "the names of columns to remove")
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}
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fn usage(&self) -> &str {
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"Remove the given columns from the table."
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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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args.process(registry, reject)?.run()
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}
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}
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fn reject(
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RejectArgs { rest: fields }: RejectArgs,
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RunnableContext { input, name, .. }: RunnableContext,
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) -> Result<OutputStream, ShellError> {
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if fields.is_empty() {
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return Err(ShellError::labeled_error(
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"Reject requires fields",
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"needs parameter",
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name,
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));
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}
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let fields: Vec<_> = fields.iter().map(|f| f.item.clone()).collect();
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let stream = input.map(move |item| reject_fields(&item, &fields, &item.tag));
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Ok(stream.from_input_stream())
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}
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