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use nu_engine::CallExt;
use nu_protocol::{
ast::Call,
engine::{Command, EngineState, Stack},
Category, Example, PipelineData, ShellError, Signature, Span, Spanned, SyntaxShape, Value,
};
#[derive(Clone)]
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)
}
fn usage(&self) -> &str {
"Split a string into multiple rows using a separator"
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
split_row(engine_state, stack, call, input)
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Split a string into rows of char",
example: "echo 'abc' | split row ''",
result: Some(Value::List {
vals: vec![
Value::test_string("a"),
Value::test_string("b"),
Value::test_string("c"),
],
span: Span::test_data(),
}),
},
Example {
description: "Split a string into rows by the specified separator",
example: "echo 'a--b--c' | split row '--'",
result: Some(Value::List {
vals: vec![
Value::test_string("a"),
Value::test_string("b"),
Value::test_string("c"),
],
span: Span::test_data(),
}),
},
]
}
}
fn split_row(
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
let name_span = call.head;
let separator: Spanned<String> = call.req(engine_state, stack, 0)?;
input.flat_map(
move |x| split_row_helper(&x, &separator, name_span),
engine_state.ctrlc.clone(),
)
}
fn split_row_helper(v: &Value, separator: &Spanned<String>, name: Span) -> Vec<Value> {
match v.span() {
Ok(v_span) => {
if let Ok(s) = v.as_string() {
s.split(&separator.item)
.filter_map(|s| {
if s.trim() != "" {
Some(Value::string(s, v_span))
} else {
None
}
})
.collect()
} else {
vec![Value::Error {
error: ShellError::PipelineMismatch("string".into(), name, v_span),
}]
}
}
Err(error) => vec![Value::Error { error }],
}
}