forked from extern/nushell
60 lines
1.6 KiB
Rust
60 lines
1.6 KiB
Rust
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use nu_engine::CallExt;
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use nu_protocol::ast::Call;
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use nu_protocol::engine::{Command, EvaluationContext};
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use nu_protocol::{IntoValueStream, Signature, SyntaxShape, Value};
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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").required("name", SyntaxShape::String, "the name of the column")
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}
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fn run(
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&self,
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context: &EvaluationContext,
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call: &Call,
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input: Value,
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) -> Result<nu_protocol::Value, nu_protocol::ShellError> {
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let span = call.head;
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let name: String = call.req(context, 0)?;
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match input {
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Value::List { vals, .. } => Ok(Value::List {
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vals: 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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.collect(),
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span,
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}),
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Value::Stream { stream, .. } => Ok(Value::Stream {
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stream: 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_value_stream(),
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span,
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}),
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_ => 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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}
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}
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}
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