forked from extern/nushell
137 lines
3.7 KiB
Rust
137 lines
3.7 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, Signature, SyntaxShape, UntaggedValue,
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};
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pub struct Command;
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struct AllArgs {
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predicate: CapturedBlock,
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}
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impl WholeStreamCommand for Command {
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fn name(&self) -> &str {
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"all?"
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}
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fn signature(&self) -> Signature {
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Signature::build("all?").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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"Find if the table rows matches the condition."
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}
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fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
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all(args)
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}
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fn examples(&self) -> Vec<Example> {
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use nu_protocol::Value;
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vec![
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Example {
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description: "Find if services are running",
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example: "echo [[status]; [UP] [UP]] | all? status == UP",
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result: Some(vec![Value::from(true)]),
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},
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Example {
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description: "Check that all values are even",
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example: "echo [2 4 6 8] | all? $(= $it mod 2) == 0",
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result: Some(vec![Value::from(true)]),
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},
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]
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}
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}
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fn all(args: CommandArgs) -> Result<OutputStream, ShellError> {
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let ctx = EvaluationContext::from_args(&args);
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let tag = args.call_info.name_tag.clone();
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let args = args.evaluate_once()?;
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let all_args = AllArgs {
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predicate: args.req(0)?,
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};
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let err = Err(ShellError::labeled_error(
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"Expected a condition",
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"expected a condition",
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args.call_info.name_tag.clone(),
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));
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//This seems a little odd. Can't we have predicates with pipelines/multiple statements?
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let condition = {
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if all_args.predicate.block.block.len() != 1 {
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return err;
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}
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match all_args.predicate.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;
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}
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},
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None => {
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return err;
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}
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}
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};
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let scope = args.scope();
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let init = Ok(InputStream::one(
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UntaggedValue::boolean(true).into_value(&tag),
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));
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// Variables in nu are immutable. Having the same variable accross invocations
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// of evaluate_baseline_expr does not mutate the variables and those each
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// invocations are independent of each other!
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scope.enter_scope();
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scope.add_vars(&all_args.predicate.captured.entries);
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let result = args.input.fold(init, move |acc, row| {
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let condition = condition.clone();
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let ctx = ctx.clone();
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ctx.scope.add_var("$it", row);
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let condition = evaluate_baseline_expr(&condition, &ctx);
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let curr = acc?.drain_vec();
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let curr = curr
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.get(0)
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.ok_or_else(|| ShellError::unexpected("No value to check with"))?;
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let cond = curr.as_bool()?;
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match condition {
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Ok(condition) => match condition.as_bool() {
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Ok(b) => Ok(InputStream::one(
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UntaggedValue::boolean(cond && b).into_value(&curr.tag),
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)),
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Err(e) => Err(e),
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},
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Err(e) => Err(e),
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}
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});
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scope.exit_scope();
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Ok(result?.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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