146 lines
3.9 KiB
Rust
146 lines
3.9 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::prelude::*;
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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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use nu_source::Tag;
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use nu_value_ext::ValueExt;
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#[derive(Deserialize)]
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struct Arguments {
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rest: Vec<ColumnPath>,
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}
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pub struct SubCommand;
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#[async_trait]
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impl WholeStreamCommand for SubCommand {
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fn name(&self) -> &str {
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"str capitalize"
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}
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fn signature(&self) -> Signature {
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Signature::build("str capitalize").rest(
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SyntaxShape::ColumnPath,
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"optionally capitalize text by column paths",
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)
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}
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fn usage(&self) -> &str {
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"capitalizes text"
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}
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async fn run(
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&self,
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args: CommandArgs,
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registry: &CommandRegistry,
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) -> Result<OutputStream, ShellError> {
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operate(args, registry)
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Capitalize contents",
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example: "echo 'good day' | str capitalize",
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result: Some(vec![Value::from("Good day")]),
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}]
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}
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}
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fn operate(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
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let registry = registry.clone();
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let stream = async_stream! {
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let (Arguments { rest }, mut input) = args.process(®istry).await?;
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let column_paths: Vec<_> = rest.iter().map(|x| x.clone()).collect();
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while let Some(v) = input.next().await {
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if column_paths.is_empty() {
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match action(&v, v.tag()) {
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Ok(out) => yield ReturnSuccess::value(out),
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Err(err) => {
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yield Err(err);
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return;
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}
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}
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} else {
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let mut ret = v.clone();
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for path in &column_paths {
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let swapping = ret.swap_data_by_column_path(path, Box::new(move |old| action(old, old.tag())));
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match swapping {
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Ok(new_value) => {
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ret = new_value;
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}
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Err(err) => {
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yield Err(err);
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return;
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}
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}
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}
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yield ReturnSuccess::value(ret);
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}
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}
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};
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Ok(stream.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::Line(s))
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| UntaggedValue::Primitive(Primitive::String(s)) => {
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let mut capitalized = String::new();
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for (idx, character) in s.chars().enumerate() {
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let out = if idx == 0 {
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character.to_uppercase().to_string()
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} else {
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character.to_lowercase().to_string()
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};
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capitalized.push_str(&out);
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}
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Ok(UntaggedValue::string(capitalized).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::{action, SubCommand};
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use nu_plugin::test_helpers::value::string;
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use nu_source::Tag;
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#[test]
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fn examples_work_as_expected() {
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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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#[test]
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fn capitalizes() {
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let word = string("andres");
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let expected = string("Andres");
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let actual = action(&word, Tag::unknown()).unwrap();
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assert_eq!(actual, expected);
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}
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}
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