use nu_engine::eval_expression;
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
Category, Example, IntoPipelineData, PipelineData, ShellError, Signature, Span, SyntaxShape,
Type, Value,
};
#[derive(Clone)]
pub struct BytesBuild;
impl Command for BytesBuild {
fn name(&self) -> &str {
"bytes build"
}
fn usage(&self) -> &str {
"Create bytes from the arguments."
}
fn search_terms(&self) -> Vec<&str> {
vec!["concatenate", "join"]
}
fn signature(&self) -> nu_protocol::Signature {
Signature::build("bytes build")
.input_output_types(vec![(Type::Nothing, Type::Binary)])
.rest("rest", SyntaxShape::Any, "List of bytes.")
.category(Category::Bytes)
}
fn examples(&self) -> Vec<Example> {
vec![Example {
example: "bytes build 0x[01 02] 0x[03] 0x[04]",
description: "Builds binary data from 0x[01 02], 0x[03], 0x[04]",
result: Some(Value::binary(
vec![0x01, 0x02, 0x03, 0x04],
Span::test_data(),
)),
}]
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
_input: PipelineData,
) -> Result<PipelineData, ShellError> {
let mut output = vec![];
for val in call.rest_iter_flattened(0, |expr| eval_expression(engine_state, stack, expr))? {
match val {
Value::Binary { mut val, .. } => output.append(&mut val),
Value::Error { error, .. } => return Err(*error),
other => {
return Err(ShellError::TypeMismatch {
err_message: "only binary data arguments are supported".to_string(),
span: other.span(),
})
}
}
}
Ok(Value::binary(output, call.head).into_pipeline_data())
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_examples() {
use crate::test_examples;
test_examples(BytesBuild {})
}
}