110 lines
2.9 KiB
Rust
110 lines
2.9 KiB
Rust
use crate::prelude::*;
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use nu_engine::WholeStreamCommand;
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use nu_errors::ShellError;
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use nu_protocol::ShellTypeName;
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use nu_protocol::{
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ColumnPath, Primitive, ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value,
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};
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pub struct SubCommand;
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struct Arguments {
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column_paths: Vec<ColumnPath>,
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}
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impl WholeStreamCommand for SubCommand {
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fn name(&self) -> &str {
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"str length"
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}
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fn signature(&self) -> Signature {
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Signature::build("str length").rest(
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SyntaxShape::ColumnPath,
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"optionally find length of text by column paths",
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)
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}
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fn usage(&self) -> &str {
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"outputs the lengths of the strings in the pipeline"
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}
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fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
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operate(args)
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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: "Return the lengths of multiple strings",
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example: "echo 'hello' | str length",
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result: Some(vec![UntaggedValue::int(5).into_untagged_value()]),
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},
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Example {
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description: "Return the lengths of multiple strings",
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example: "echo 'hi' 'there' | str length",
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result: Some(vec![
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UntaggedValue::int(2).into_untagged_value(),
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UntaggedValue::int(5).into_untagged_value(),
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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(args: CommandArgs) -> Result<OutputStream, ShellError> {
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let (options, input) = args.extract(|params| {
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Ok(Arguments {
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column_paths: params.rest_args()?,
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})
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})?;
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Ok(input
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.map(move |v| {
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if options.column_paths.is_empty() {
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ReturnSuccess::value(action(&v, v.tag())?)
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} else {
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let mut ret = v;
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for path in &options.column_paths {
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ret = ret.swap_data_by_column_path(
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path,
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Box::new(move |old| action(old, old.tag())),
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)?;
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}
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ReturnSuccess::value(ret)
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}
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})
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.to_output_stream())
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}
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fn action(input: &Value, tag: impl Into<Tag>) -> Result<Value, ShellError> {
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match &input.value {
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UntaggedValue::Primitive(Primitive::String(s)) => {
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Ok(UntaggedValue::int(s.len()).into_value(tag))
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}
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other => {
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let got = format!("got {}", other.type_name());
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Err(ShellError::labeled_error(
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"value is not string",
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got,
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tag.into().span,
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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 tests {
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use super::ShellError;
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use super::SubCommand;
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#[test]
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fn examples_work_as_expected() -> Result<(), ShellError> {
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use crate::examples::test as test_examples;
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test_examples(SubCommand {})
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}
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}
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