mirror of
https://github.com/nushell/nushell.git
synced 2024-12-23 23:49:44 +01:00
Add 'every' command to select (or skip) every nth row (#1992)
* Add 'every' command * Add --skip option to 'every' command This option skips instead of selects every nth row * Fix descriptions for 'every' command * Add docummentation for 'every' command * Check actual filenames in 'every' command tests
This commit is contained in:
Jakub Žádník
GitHub
parent
eb1ada6115
commit
3d63901b3b
@ -320,6 +320,7 @@ pub fn create_default_context(
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whole_stream_command(GroupByDate),
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whole_stream_command(First),
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whole_stream_command(Last),
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whole_stream_command(Every),
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whole_stream_command(Nth),
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whole_stream_command(Drop),
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whole_stream_command(Format),
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@ -30,6 +30,7 @@ pub(crate) mod echo;
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pub(crate) mod enter;
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#[allow(unused)]
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pub(crate) mod evaluate_by;
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pub(crate) mod every;
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pub(crate) mod exit;
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pub(crate) mod first;
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pub(crate) mod format;
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@ -160,6 +161,7 @@ pub(crate) mod touch;
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pub(crate) use enter::Enter;
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#[allow(unused_imports)]
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pub(crate) use evaluate_by::EvaluateBy;
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pub(crate) use every::Every;
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pub(crate) use exit::Exit;
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pub(crate) use first::First;
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pub(crate) use format::Format;
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105
crates/nu-cli/src/commands/every.rs
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105
crates/nu-cli/src/commands/every.rs
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@ -0,0 +1,105 @@
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use crate::commands::WholeStreamCommand;
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use crate::context::CommandRegistry;
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use crate::prelude::*;
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use nu_errors::ShellError;
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use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue};
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use nu_source::Tagged;
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pub struct Every;
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#[derive(Deserialize)]
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pub struct EveryArgs {
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stride: Tagged<u64>,
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skip: Tagged<bool>,
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}
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#[async_trait]
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impl WholeStreamCommand for Every {
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fn name(&self) -> &str {
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"every"
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}
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fn signature(&self) -> Signature {
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Signature::build(self.name())
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.required(
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"stride",
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SyntaxShape::Int,
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"how many rows to skip between (and including) each row returned",
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)
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.switch(
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"skip",
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"skip the rows that would be returned, instead of selecting them",
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Some('s'),
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)
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}
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fn usage(&self) -> &str {
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"Show (or skip) every n-th row, starting from the first one."
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}
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async 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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every(args, registry).await
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}
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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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description: "Get every second row",
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example: "echo [1 2 3 4 5] | every 2",
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result: Some(vec![
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UntaggedValue::int(1).into(),
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UntaggedValue::int(3).into(),
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UntaggedValue::int(5).into(),
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]),
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},
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Example {
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description: "Skip every second row",
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example: "echo [1 2 3 4 5] | every 2 --skip",
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result: Some(vec![
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UntaggedValue::int(2).into(),
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UntaggedValue::int(4).into(),
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]),
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},
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]
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}
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}
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async fn every(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
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let registry = registry.clone();
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let (EveryArgs { stride, skip }, input) = args.process(®istry).await?;
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let v: Vec<_> = input.into_vec().await;
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let stride_desired = if stride.item < 1 { 1 } else { stride.item } as usize;
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let mut values_vec_deque = VecDeque::new();
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for (i, x) in v.iter().enumerate() {
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let should_include = if skip.item {
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i % stride_desired != 0
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} else {
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i % stride_desired == 0
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};
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if should_include {
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values_vec_deque.push_back(ReturnSuccess::value(x.clone()));
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}
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}
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Ok(futures::stream::iter(values_vec_deque).to_output_stream())
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}
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#[cfg(test)]
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mod tests {
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use super::Every;
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#[test]
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fn examples_work_as_expected() {
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use crate::examples::test as test_examples;
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test_examples(Every {})
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}
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}
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245
crates/nu-cli/tests/commands/every.rs
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245
crates/nu-cli/tests/commands/every.rs
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@ -0,0 +1,245 @@
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use nu_test_support::fs::Stub::EmptyFile;
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use nu_test_support::playground::Playground;
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use nu_test_support::{nu, pipeline};
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#[test]
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fn gets_all_rows_by_every_zero() {
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Playground::setup("every_test_1", |dirs, sandbox| {
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sandbox.with_files(vec![
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EmptyFile("los.txt"),
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EmptyFile("tres.txt"),
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EmptyFile("amigos.txt"),
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EmptyFile("arepas.clu"),
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]);
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let actual = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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ls
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| get name
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| every 0
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"#
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));
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let expected = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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echo [ amigos.txt arepas.clu los.txt tres.txt ]
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"#
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));
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assert_eq!(actual.out, expected.out);
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})
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}
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#[test]
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fn gets_no_rows_by_every_skip_zero() {
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Playground::setup("every_test_2", |dirs, sandbox| {
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sandbox.with_files(vec![
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EmptyFile("los.txt"),
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EmptyFile("tres.txt"),
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EmptyFile("amigos.txt"),
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EmptyFile("arepas.clu"),
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]);
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let actual = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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ls
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| get name
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| every 0 --skip
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"#
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));
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let expected = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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echo [ ]
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"#
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));
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assert_eq!(actual.out, expected.out);
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})
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}
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#[test]
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fn gets_all_rows_by_every_one() {
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Playground::setup("every_test_3", |dirs, sandbox| {
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sandbox.with_files(vec![
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EmptyFile("los.txt"),
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EmptyFile("tres.txt"),
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EmptyFile("amigos.txt"),
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EmptyFile("arepas.clu"),
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]);
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let actual = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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ls
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| get name
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| every 1
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"#
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));
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let expected = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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echo [ amigos.txt arepas.clu los.txt tres.txt ]
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"#
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));
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assert_eq!(actual.out, expected.out);
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})
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}
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#[test]
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fn gets_no_rows_by_every_skip_one() {
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Playground::setup("every_test_4", |dirs, sandbox| {
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sandbox.with_files(vec![
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EmptyFile("los.txt"),
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EmptyFile("tres.txt"),
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EmptyFile("amigos.txt"),
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EmptyFile("arepas.clu"),
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]);
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let actual = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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ls
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| get name
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| every 1 --skip
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"#
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));
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let expected = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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echo [ ]
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"#
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));
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assert_eq!(actual.out, expected.out);
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})
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}
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#[test]
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fn gets_first_row_by_every_too_much() {
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Playground::setup("every_test_5", |dirs, sandbox| {
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sandbox.with_files(vec![
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EmptyFile("los.txt"),
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EmptyFile("tres.txt"),
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EmptyFile("amigos.txt"),
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EmptyFile("arepas.clu"),
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]);
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let actual = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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ls
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| get name
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| every 999
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"#
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));
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let expected = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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echo [ amigos.txt ]
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"#
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));
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assert_eq!(actual.out, expected.out);
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})
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}
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#[test]
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fn gets_all_rows_except_first_by_every_skip_too_much() {
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Playground::setup("every_test_6", |dirs, sandbox| {
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sandbox.with_files(vec![
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EmptyFile("los.txt"),
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EmptyFile("tres.txt"),
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EmptyFile("amigos.txt"),
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EmptyFile("arepas.clu"),
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]);
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let actual = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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ls
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| get name
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| every 999 --skip
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"#
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));
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let expected = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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echo [ arepas.clu los.txt tres.txt ]
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"#
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));
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assert_eq!(actual.out, expected.out);
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})
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}
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#[test]
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fn gets_every_third_row() {
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Playground::setup("every_test_7", |dirs, sandbox| {
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sandbox.with_files(vec![
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EmptyFile("los.txt"),
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EmptyFile("tres.txt"),
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EmptyFile("quatro.txt"),
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EmptyFile("amigos.txt"),
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EmptyFile("arepas.clu"),
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]);
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let actual = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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ls
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| get name
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| every 3
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"#
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));
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let expected = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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echo [ amigos.txt quatro.txt ]
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"#
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));
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assert_eq!(actual.out, expected.out);
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})
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}
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#[test]
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fn skips_every_third_row() {
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Playground::setup("every_test_8", |dirs, sandbox| {
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sandbox.with_files(vec![
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EmptyFile("los.txt"),
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EmptyFile("tres.txt"),
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EmptyFile("quatro.txt"),
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EmptyFile("amigos.txt"),
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EmptyFile("arepas.clu"),
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]);
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let actual = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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ls
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| get name
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| every 3 --skip
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"#
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));
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let expected = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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echo [ arepas.clu los.txt tres.txt ]
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"#
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));
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assert_eq!(actual.out, expected.out);
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})
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}
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@ -10,6 +10,7 @@ mod default;
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mod drop;
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mod each;
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mod enter;
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mod every;
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mod first;
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mod format;
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mod get;
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46
docs/commands/every.md
Normal file
46
docs/commands/every.md
Normal file
@ -0,0 +1,46 @@
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# every
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Selects every n-th row of a table, starting from the first one. With the `--skip` flag, every n-th row will be skipped, inverting the original functionality.
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Syntax: `> [input-command] | every <stride> {flags}`
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## Flags
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* `--skip`, `-s`: Skip the rows that would be returned, instead of selecting them
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## Examples
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```shell
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> open contacts.csv
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───┬─────────┬──────┬─────────────────
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# │ first │ last │ email
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───┼─────────┼──────┼─────────────────
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0 │ John │ Doe │ doe.1@email.com
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1 │ Jane │ Doe │ doe.2@email.com
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2 │ Chris │ Doe │ doe.3@email.com
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3 │ Francis │ Doe │ doe.4@email.com
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4 │ Stella │ Doe │ doe.5@email.com
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───┴─────────┴──────┴─────────────────
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```
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```shell
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> open contacts.csv | every 2
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───┬─────────┬──────┬─────────────────
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# │ first │ last │ email
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───┼─────────┼──────┼─────────────────
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0 │ John │ Doe │ doe.1@email.com
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2 │ Chris │ Doe │ doe.3@email.com
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4 │ Stella │ Doe │ doe.5@email.com
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───┴─────────┴──────┴─────────────────
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```
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```shell
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> open contacts.csv | every 2 --skip
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───┬─────────┬──────┬─────────────────
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# │ first │ last │ email
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───┼─────────┼──────┼─────────────────
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1 │ Jane │ Doe │ doe.2@email.com
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3 │ Francis │ Doe │ doe.4@email.com
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───┴─────────┴──────┴─────────────────
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```
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