nushell/crates/nu-command/src/strings/split/row.rs

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use nu_engine::CallExt;
use nu_protocol::{
ast::Call,
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engine::{Command, EngineState, Stack},
Category, PipelineData, ShellError, Signature, Span, Spanned, SyntaxShape, Type, Value,
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};
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#[derive(Clone)]
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pub struct SubCommand;
impl Command for SubCommand {
fn name(&self) -> &str {
"split row"
}
fn signature(&self) -> Signature {
Signature::build("split row")
.required(
"separator",
SyntaxShape::String,
"the character that denotes what separates rows",
)
.category(Category::Strings)
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}
fn usage(&self) -> &str {
"splits contents over multiple rows via the separator."
}
fn run(
&self,
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engine_state: &EngineState,
stack: &mut Stack,
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call: &Call,
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input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
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split_row(engine_state, stack, call, input)
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}
}
fn split_row(
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engine_state: &EngineState,
stack: &mut Stack,
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call: &Call,
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input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
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let name_span = call.head;
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let separator: Spanned<String> = call.req(engine_state, stack, 0)?;
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input.flat_map(
move |x| split_row_helper(&x, &separator, name_span),
engine_state.ctrlc.clone(),
)
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}
fn split_row_helper(v: &Value, separator: &Spanned<String>, name: Span) -> Vec<Value> {
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match v.span() {
Ok(v_span) => {
if let Ok(s) = v.as_string() {
let splitter = separator.item.replace("\\n", "\n");
s.split(&splitter)
.filter_map(|s| {
if s.trim() != "" {
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Some(Value::string(s, v_span))
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} else {
None
}
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})
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.collect()
} else {
vec![Value::Error {
error: ShellError::PipelineMismatch {
expected: Type::String,
expected_span: name,
origin: v_span,
},
}]
}
}
Err(error) => vec![Value::Error { error }],
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}
}
// #[cfg(test)]
// mod tests {
// use super::ShellError;
// use super::SubCommand;
// #[test]
// fn examples_work_as_expected() -> Result<(), ShellError> {
// use crate::examples::test as test_examples;
// test_examples(SubCommand {})
// }
// }