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Introduce metadata into the pipeline (#397)

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This commit is contained in:
JT
2021-12-02 18:59:10 +13:00
committed by GitHub
parent 56307553ae
commit 45eba8b922
28 changed files with 329 additions and 199 deletions
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21
crates/nu-command/src/core_commands/echo.rs
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@ -34,19 +34,22 @@ impl Command for Echo {
let n = to_be_echoed.len();
match n.cmp(&1usize) {
// More than one value is converted in a stream of values
std::cmp::Ordering::Greater => PipelineData::Stream(ValueStream::from_stream(
to_be_echoed.into_iter(),
engine_state.ctrlc.clone(),
)),
std::cmp::Ordering::Greater => PipelineData::Stream(
ValueStream::from_stream(to_be_echoed.into_iter(), engine_state.ctrlc.clone()),
None,
),
// But a single value can be forwarded as it is
std::cmp::Ordering::Equal => PipelineData::Value(to_be_echoed[0].clone()),
std::cmp::Ordering::Equal => PipelineData::Value(to_be_echoed[0].clone(), None),
// When there are no elements, we echo the empty string
std::cmp::Ordering::Less => PipelineData::Value(Value::String {
val: "".to_string(),
span: call.head,
}),
std::cmp::Ordering::Less => PipelineData::Value(
Value::String {
val: "".to_string(),
span: call.head,
},
None,
),
}
})
}