f70c6d5d48
This commit extracts Tag, Span, Text, as well as source-related debug facilities into a new crate called nu_source. This change is much bigger than one might have expected because the previous code relied heavily on implementing inherent methods on `Tagged<T>` and `Spanned<T>`, which is no longer possible. As a result, this change creates more concrete types instead of using `Tagged<T>`. One notable example: Tagged<Value> became Value, and Value became UntaggedValue. This change clarifies the intent of the code in many places, but it does make it a big change.
48 lines
1.1 KiB
Rust
48 lines
1.1 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::errors::ShellError;
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use crate::parser::CommandRegistry;
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use crate::prelude::*;
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#[derive(Deserialize)]
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struct PrependArgs {
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row: Value,
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}
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pub struct Prepend;
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impl WholeStreamCommand for Prepend {
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fn name(&self) -> &str {
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"prepend"
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}
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fn signature(&self) -> Signature {
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Signature::build("prepend").required(
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"row value",
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SyntaxShape::Any,
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"the value of the row to prepend to the table",
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)
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}
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fn usage(&self) -> &str {
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"Prepend the given row to the front of the table"
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}
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fn run(
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&self,
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args: CommandArgs,
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registry: &CommandRegistry,
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) -> Result<OutputStream, ShellError> {
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args.process(registry, prepend)?.run()
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}
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}
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fn prepend(
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PrependArgs { row }: PrependArgs,
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RunnableContext { input, .. }: RunnableContext,
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) -> Result<OutputStream, ShellError> {
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let mut prepend: VecDeque<Value> = VecDeque::new();
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prepend.push_back(row);
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Ok(OutputStream::from_input(prepend.chain(input.values)))
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}
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