e4226def16
This commit extracts five new crates:
- nu-source, which contains the core source-code handling logic in Nu,
including Text, Span, and also the pretty.rs-based debug logic
- nu-parser, which is the parser and expander logic
- nu-protocol, which is the bulk of the types and basic conveniences
used by plugins
- nu-errors, which contains ShellError, ParseError and error handling
conveniences
- nu-textview, which is the textview plugin extracted into a crate
One of the major consequences of this refactor is that it's no longer
possible to `impl X for Spanned<Y>` outside of the `nu-source` crate, so
a lot of types became more concrete (Value became a concrete type
instead of Spanned<Value>, for example).
This also turned a number of inherent methods in the main nu crate into
plain functions (impl Value {} became a bunch of functions in the
`value` namespace in `crate::data::value`).
49 lines
1.1 KiB
Rust
49 lines
1.1 KiB
Rust
use crate::commands::WholeStreamCommand;
|
|
use crate::context::CommandRegistry;
|
|
use crate::prelude::*;
|
|
use nu_errors::ShellError;
|
|
use nu_protocol::{Signature, SyntaxShape, Value};
|
|
|
|
#[derive(Deserialize)]
|
|
struct PrependArgs {
|
|
row: Value,
|
|
}
|
|
|
|
pub struct Prepend;
|
|
|
|
impl WholeStreamCommand for Prepend {
|
|
fn name(&self) -> &str {
|
|
"prepend"
|
|
}
|
|
|
|
fn signature(&self) -> Signature {
|
|
Signature::build("prepend").required(
|
|
"row value",
|
|
SyntaxShape::Any,
|
|
"the value of the row to prepend to the table",
|
|
)
|
|
}
|
|
|
|
fn usage(&self) -> &str {
|
|
"Prepend the given row to the front of the table"
|
|
}
|
|
|
|
fn run(
|
|
&self,
|
|
args: CommandArgs,
|
|
registry: &CommandRegistry,
|
|
) -> Result<OutputStream, ShellError> {
|
|
args.process(registry, prepend)?.run()
|
|
}
|
|
}
|
|
|
|
fn prepend(
|
|
PrependArgs { row }: PrependArgs,
|
|
RunnableContext { input, .. }: RunnableContext,
|
|
) -> Result<OutputStream, ShellError> {
|
|
let mut prepend: VecDeque<Value> = VecDeque::new();
|
|
prepend.push_back(row);
|
|
|
|
Ok(OutputStream::from_input(prepend.chain(input.values)))
|
|
}
|