forked from extern/nushell
b2c5af457e
This improves incremental build time when working on what was previously the root package. For example, previously all plugins would be rebuilt with a change to `src/commands/classified/external.rs`, but now only `nu-cli` will have to be rebuilt (and anything that depends on it).
63 lines
1.7 KiB
Rust
63 lines
1.7 KiB
Rust
use crate::commands::PerItemCommand;
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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::{CallInfo, ReturnSuccess, Scope, Signature, SyntaxShape, UntaggedValue, Value};
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pub struct Where;
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impl PerItemCommand for Where {
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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::Block,
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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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fn run(
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&self,
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call_info: &CallInfo,
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_registry: &CommandRegistry,
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_raw_args: &RawCommandArgs,
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input: Value,
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) -> Result<OutputStream, ShellError> {
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let condition = call_info.args.expect_nth(0)?;
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let stream = match condition {
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Value {
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value: UntaggedValue::Block(block),
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..
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} => {
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let result = block.invoke(&Scope::new(input.clone()));
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match result {
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Ok(v) => {
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if v.is_true() {
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VecDeque::from(vec![Ok(ReturnSuccess::Value(input))])
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} else {
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VecDeque::new()
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}
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}
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Err(e) => return Err(e),
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}
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}
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Value { tag, .. } => {
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return Err(ShellError::labeled_error(
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"Expected a condition",
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"where needs a condition",
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tag,
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))
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}
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};
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Ok(stream.into())
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}
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}
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