nushell/crates/nu-cli/src/commands/path/extension.rs
Jonathan Turner 0e13d9fbaa
Rename the Path and Pattern primitives (#2889)
* Rename the Path primitive to FilePath

* Rename glob pattern also

* more fun

* Fix the Windows path methods
2021-01-08 20:30:41 +13:00

99 lines
3.1 KiB
Rust

use super::{operate, DefaultArguments};
use crate::commands::WholeStreamCommand;
use crate::prelude::*;
use nu_errors::ShellError;
use nu_protocol::{ColumnPath, Signature, SyntaxShape, UntaggedValue, Value};
use nu_source::Tagged;
use std::path::Path;
pub struct PathExtension;
#[derive(Deserialize)]
struct PathExtensionArguments {
replace: Option<Tagged<String>>,
rest: Vec<ColumnPath>,
}
#[async_trait]
impl WholeStreamCommand for PathExtension {
fn name(&self) -> &str {
"path extension"
}
fn signature(&self) -> Signature {
Signature::build("path extension")
.named(
"replace",
SyntaxShape::String,
"Return original path with extension replaced by this string",
Some('r'),
)
.rest(SyntaxShape::ColumnPath, "Optionally operate by column path")
}
fn usage(&self) -> &str {
"Gets the extension of a path"
}
async fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
let tag = args.call_info.name_tag.clone();
let (PathExtensionArguments { replace, rest }, input) = args.process().await?;
let args = Arc::new(DefaultArguments {
replace: replace.map(|v| v.item),
prefix: None,
suffix: None,
num_levels: None,
paths: rest,
});
operate(input, &action, tag.span, args).await
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Get extension of a path",
example: "echo 'test.txt' | path extension",
result: Some(vec![Value::from("txt")]),
},
Example {
description: "You get an empty string if there is no extension",
example: "echo 'test' | path extension",
result: Some(vec![Value::from("")]),
},
Example {
description: "Replace an extension with a custom string",
example: "echo 'test.txt' | path extension -r md",
result: Some(vec![Value::from(UntaggedValue::filepath("test.md"))]),
},
Example {
description: "To replace more complex extensions:",
example: "echo 'test.tar.gz' | path extension -r '' | path extension -r txt",
result: Some(vec![Value::from(UntaggedValue::filepath("test.txt"))]),
},
]
}
}
fn action(path: &Path, args: Arc<DefaultArguments>) -> UntaggedValue {
match args.replace {
Some(ref extension) => UntaggedValue::filepath(path.with_extension(extension)),
None => UntaggedValue::string(match path.extension() {
Some(extension) => extension.to_string_lossy(),
None => "".into(),
}),
}
}
#[cfg(test)]
mod tests {
use super::PathExtension;
use super::ShellError;
#[test]
fn examples_work_as_expected() -> Result<(), ShellError> {
use crate::examples::test as test_examples;
Ok(test_examples(PathExtension {})?)
}
}