forked from extern/nushell
77 lines
2.0 KiB
Rust
77 lines
2.0 KiB
Rust
use nu_engine::eval_expression;
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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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Example, IntoPipelineData, PipelineData, ShellError, Signature, Span, SyntaxShape, Value,
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};
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#[derive(Clone)]
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pub struct BuildString;
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impl Command for BuildString {
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fn name(&self) -> &str {
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"build-string"
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}
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fn usage(&self) -> &str {
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"Create a string from the arguments."
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}
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fn signature(&self) -> nu_protocol::Signature {
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Signature::build("build-string").rest("rest", SyntaxShape::String, "list of string")
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}
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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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example: "build-string a b c",
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description: "Builds a string from letters a b c",
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result: Some(Value::String {
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val: "abc".to_string(),
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span: Span::unknown(),
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}),
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},
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Example {
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example: "build-string (1 + 2) = one ' ' plus ' ' two",
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description: "Builds a string from letters a b c",
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result: Some(Value::String {
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val: "3=one plus two".to_string(),
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span: Span::unknown(),
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}),
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},
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]
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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 output = call
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.positional
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.iter()
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.map(|expr| eval_expression(engine_state, stack, expr).map(|val| val.into_string()))
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.collect::<Result<Vec<String>, ShellError>>()?;
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Ok(Value::String {
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val: output.join(""),
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span: call.head,
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}
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.into_pipeline_data())
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn test_examples() {
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use crate::test_examples;
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test_examples(BuildString {})
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}
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}
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