* Fix exit usage * Move dfr as-date* format examples to extra_usage * Update command usage and examples * More docs on `str trim` Co-authored-by: sholderbach <sholderbach@users.noreply.github.com>
164 lines
4.9 KiB
Rust
164 lines
4.9 KiB
Rust
use nu_engine::CallExt;
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use nu_protocol::ast::Call;
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use nu_protocol::ast::CellPath;
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use nu_protocol::engine::{Command, EngineState, Stack};
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use nu_protocol::Category;
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use nu_protocol::{Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Value};
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#[derive(Clone)]
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pub struct SubCommand;
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impl Command for SubCommand {
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fn name(&self) -> &str {
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"str downcase"
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}
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fn signature(&self) -> Signature {
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Signature::build("str downcase")
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.rest(
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"rest",
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SyntaxShape::CellPath,
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"optionally downcase text by column paths",
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)
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.category(Category::Strings)
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}
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fn usage(&self) -> &str {
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"Make text lowercase"
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["lower case", "lowercase"]
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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<PipelineData, ShellError> {
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operate(engine_state, stack, call, input)
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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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description: "Downcase contents",
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example: "'NU' | str downcase",
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result: Some(Value::String {
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val: "nu".to_string(),
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span: Span::test_data(),
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}),
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},
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Example {
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description: "Downcase contents",
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example: "'TESTa' | str downcase",
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result: Some(Value::String {
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val: "testa".to_string(),
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span: Span::test_data(),
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}),
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},
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Example {
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description: "Downcase contents",
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example: "[[ColA ColB]; [Test ABC]] | str downcase ColA",
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result: Some(Value::List {
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vals: vec![Value::Record {
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cols: vec!["ColA".to_string(), "ColB".to_string()],
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vals: vec![
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Value::String {
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val: "test".to_string(),
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span: Span::test_data(),
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},
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Value::String {
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val: "ABC".to_string(),
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span: Span::test_data(),
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},
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],
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span: Span::test_data(),
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}],
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span: Span::test_data(),
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}),
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},
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Example {
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description: "Downcase contents",
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example: "[[ColA ColB]; [Test ABC]] | str downcase ColA ColB",
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result: Some(Value::List {
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vals: vec![Value::Record {
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cols: vec!["ColA".to_string(), "ColB".to_string()],
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vals: vec![
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Value::String {
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val: "test".to_string(),
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span: Span::test_data(),
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},
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Value::String {
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val: "abc".to_string(),
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span: Span::test_data(),
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},
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],
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span: Span::test_data(),
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}],
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span: Span::test_data(),
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}),
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},
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]
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}
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}
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fn operate(
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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<PipelineData, ShellError> {
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let head = call.head;
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let column_paths: Vec<CellPath> = call.rest(engine_state, stack, 0)?;
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input.map(
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move |v| {
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if column_paths.is_empty() {
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action(&v, head)
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} else {
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let mut ret = v;
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for path in &column_paths {
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let r =
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ret.update_cell_path(&path.members, Box::new(move |old| action(old, head)));
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if let Err(error) = r {
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return Value::Error { error };
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}
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}
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ret
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}
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},
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engine_state.ctrlc.clone(),
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)
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}
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fn action(input: &Value, head: Span) -> Value {
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match input {
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Value::String { val, .. } => Value::String {
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val: val.to_ascii_lowercase(),
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span: head,
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},
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other => Value::Error {
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error: ShellError::UnsupportedInput(
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format!(
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"Input's type is {}. This command only works with strings.",
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other.get_type()
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),
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head,
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),
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},
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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(SubCommand {})
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}
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}
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