forked from extern/nushell
72 lines
2.2 KiB
Rust
72 lines
2.2 KiB
Rust
use nu_engine::CallExt;
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use nu_protocol::ast::Call;
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use nu_protocol::engine::{Command, EngineState, Stack};
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use nu_protocol::{
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Category, IntoInterruptiblePipelineData, IntoPipelineData, PipelineData, Signature,
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SyntaxShape, Value,
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};
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#[derive(Clone)]
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pub struct Wrap;
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impl Command for Wrap {
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fn name(&self) -> &str {
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"wrap"
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}
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fn usage(&self) -> &str {
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"Wrap the value into a column."
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}
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fn signature(&self) -> nu_protocol::Signature {
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Signature::build("wrap")
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.required("name", SyntaxShape::String, "the name of the column")
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.category(Category::Filters)
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}
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fn run(
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&self,
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
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let span = call.head;
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let name: String = call.req(engine_state, stack, 0)?;
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match input {
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PipelineData::Value(Value::List { vals, .. }, ..) => Ok(vals
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.into_iter()
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.map(move |x| Value::Record {
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cols: vec![name.clone()],
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vals: vec![x],
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span,
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})
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.into_pipeline_data(engine_state.ctrlc.clone())),
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PipelineData::ListStream(stream, ..) => Ok(stream
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.map(move |x| Value::Record {
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cols: vec![name.clone()],
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vals: vec![x],
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span,
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})
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.into_pipeline_data(engine_state.ctrlc.clone())),
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PipelineData::StringStream(stream, ..) => Ok(Value::String {
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val: stream.into_string("")?,
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span,
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}
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.into_pipeline_data()),
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PipelineData::ByteStream(stream, ..) => Ok(Value::Binary {
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val: stream.into_vec()?,
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span,
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}
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.into_pipeline_data()),
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PipelineData::Value(input, ..) => Ok(Value::Record {
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cols: vec![name],
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vals: vec![input],
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span,
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}
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.into_pipeline_data()),
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}
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}
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}
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