e278ca61d1
* commands: any? all? We can check if `any` (or `all`) rows of tables match predicates. Small `all?` example: Given the following table with `services` running: ``` > echo [[status]; [UP] [UP]] ───┬──────── # │ status ───┼──────── 0 │ UP 1 │ UP ───┴──────── ``` We can ask if all services are UP, like so: ``` > echo [[status]; [UP] [UP]] | all? status == UP true ``` * Fix any? signature.
140 lines
4.1 KiB
Rust
140 lines
4.1 KiB
Rust
use crate::prelude::*;
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use nu_engine::evaluate_baseline_expr;
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use nu_engine::WholeStreamCommand;
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use nu_errors::ShellError;
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use nu_protocol::{
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hir::CapturedBlock, hir::ClassifiedCommand, ReturnSuccess, Signature, SyntaxShape,
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};
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pub struct Command;
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#[derive(Deserialize)]
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pub struct Arguments {
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block: CapturedBlock,
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}
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#[async_trait]
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impl WholeStreamCommand for Command {
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fn name(&self) -> &str {
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"where"
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}
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fn signature(&self) -> Signature {
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Signature::build("where").required(
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"condition",
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SyntaxShape::RowCondition,
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"the condition that must match",
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)
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}
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fn usage(&self) -> &str {
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"Filter table to match the condition."
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}
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async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
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where_command(args).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: "List all files in the current directory with sizes greater than 2kb",
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example: "ls | where size > 2kb",
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result: None,
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},
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Example {
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description: "List only the files in the current directory",
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example: "ls | where type == File",
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result: None,
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},
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Example {
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description: "List all files with names that contain \"Car\"",
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example: "ls | where name =~ \"Car\"",
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result: None,
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},
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Example {
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description: "List all files that were modified in the last two months",
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example: "ls | where modified <= 2mon",
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result: None,
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},
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]
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}
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}
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async fn where_command(raw_args: CommandArgs) -> Result<OutputStream, ShellError> {
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let ctx = Arc::new(EvaluationContext::from_args(&raw_args));
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let tag = raw_args.call_info.name_tag.clone();
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let (Arguments { block }, input) = raw_args.process().await?;
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let condition = {
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if block.block.block.len() != 1 {
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return Err(ShellError::labeled_error(
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"Expected a condition",
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"expected a condition",
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tag,
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));
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}
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match block.block.block[0].pipelines.get(0) {
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Some(item) => match item.list.get(0) {
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Some(ClassifiedCommand::Expr(expr)) => expr.clone(),
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_ => {
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return Err(ShellError::labeled_error(
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"Expected a condition",
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"expected a condition",
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tag,
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));
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}
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},
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None => {
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return Err(ShellError::labeled_error(
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"Expected a condition",
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"expected a condition",
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tag,
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));
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}
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}
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};
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Ok(input
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.filter_map(move |input| {
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let condition = condition.clone();
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let ctx = ctx.clone();
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ctx.scope.enter_scope();
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ctx.scope.add_vars(&block.captured.entries);
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ctx.scope.add_var("$it", input.clone());
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async move {
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//FIXME: should we use the scope that's brought in as well?
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let condition = evaluate_baseline_expr(&condition, &*ctx).await;
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ctx.scope.exit_scope();
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match condition {
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Ok(condition) => match condition.as_bool() {
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Ok(b) => {
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if b {
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Some(Ok(ReturnSuccess::Value(input)))
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} else {
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None
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}
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}
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Err(e) => Some(Err(e)),
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},
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Err(e) => Some(Err(e)),
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}
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}
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})
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.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::Command;
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use super::ShellError;
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#[test]
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fn examples_work_as_expected() -> Result<(), ShellError> {
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use crate::examples::test as test_examples;
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test_examples(Command {})
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}
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}
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