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>
62 lines
1.5 KiB
Rust
62 lines
1.5 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::context::CommandRegistry;
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use crate::prelude::*;
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use futures::stream::StreamExt;
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use nu_errors::ShellError;
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use nu_protocol::{Signature, SyntaxShape, UntaggedValue, Value};
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use nu_source::Tagged;
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pub struct Compact;
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#[derive(Deserialize)]
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pub struct CompactArgs {
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rest: Vec<Tagged<String>>,
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}
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impl WholeStreamCommand for Compact {
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fn name(&self) -> &str {
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"compact"
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}
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fn signature(&self) -> Signature {
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Signature::build("compact").rest(SyntaxShape::Any, "the columns to compact from the table")
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}
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fn usage(&self) -> &str {
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"Creates a table with non-empty rows"
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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, compact)?.run()
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}
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}
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pub fn compact(
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CompactArgs { rest: columns }: CompactArgs,
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RunnableContext { input, .. }: RunnableContext,
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) -> Result<OutputStream, ShellError> {
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let objects = input.filter(move |item| {
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let keep = if columns.is_empty() {
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item.is_some()
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} else {
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match item {
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Value {
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value: UntaggedValue::Row(ref r),
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..
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} => columns
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.iter()
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.all(|field| r.get_data(field).borrow().is_some()),
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_ => false,
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}
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};
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futures::future::ready(keep)
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});
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Ok(objects.from_input_stream())
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}
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