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>
75 lines
2.0 KiB
Rust
75 lines
2.0 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::data::value;
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use crate::prelude::*;
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use crate::utils::data_processing::map_max;
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use nu_errors::ShellError;
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use nu_protocol::{Primitive, ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
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use nu_source::Tagged;
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use num_traits::cast::ToPrimitive;
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pub struct MapMaxBy;
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#[derive(Deserialize)]
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pub struct MapMaxByArgs {
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column_name: Option<Tagged<String>>,
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}
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impl WholeStreamCommand for MapMaxBy {
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fn name(&self) -> &str {
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"map-max-by"
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}
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fn signature(&self) -> Signature {
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Signature::build("map-max-by").named(
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"column_name",
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SyntaxShape::String,
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"the name of the column to map-max the table's rows",
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Some('c'),
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)
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}
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fn usage(&self) -> &str {
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"Creates a new table with the data from the tables rows maxed by the column given."
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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, map_max_by)?.run()
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}
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}
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pub fn map_max_by(
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MapMaxByArgs { column_name }: MapMaxByArgs,
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RunnableContext { input, name, .. }: RunnableContext,
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) -> Result<OutputStream, ShellError> {
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let stream = async_stream! {
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let values: Vec<Value> = input.collect().await;
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if values.is_empty() {
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yield Err(ShellError::labeled_error(
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"Expected table from pipeline",
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"requires a table input",
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name
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))
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} else {
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let map_by_column = if let Some(column_to_map) = column_name {
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Some(column_to_map.item().clone())
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} else {
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None
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};
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match map_max(&values[0], map_by_column, name) {
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Ok(table_maxed) => yield ReturnSuccess::value(table_maxed),
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Err(err) => yield Err(err)
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}
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}
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};
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Ok(stream.to_output_stream())
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}
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