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exists.rs
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exists.rs
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use std::path::{Path, PathBuf};
use nu_engine::{current_dir, CallExt};
use nu_path::expand_path_with;
use nu_protocol::{engine::Command, Example, Signature, Span, SyntaxShape, Type, Value};
use super::PathSubcommandArguments;
struct Arguments {
columns: Option<Vec<String>>,
pwd: PathBuf,
}
impl PathSubcommandArguments for Arguments {
fn get_columns(&self) -> Option<Vec<String>> {
self.columns.clone()
}
}
#[derive(Clone)]
pub struct SubCommand;
impl Command for SubCommand {
fn name(&self) -> &str {
"path exists"
}
fn signature(&self) -> Signature {
Signature::build("path exists")
.input_output_types(vec![(Type::String, Type::Bool)])
.named(
"columns",
SyntaxShape::Table,
"For a record or table input, check strings at the given columns, and replace with result",
Some('c'),
)
}
fn usage(&self) -> &str {
"Check whether a path exists"
}
fn extra_usage(&self) -> &str {
r#"This only checks if it is possible to either `open` or `cd` to the given path.
If you need to distinguish dirs and files, please use `path type`."#
}
fn run(
&self,
engine_state: &nu_protocol::engine::EngineState,
stack: &mut nu_protocol::engine::Stack,
call: &nu_protocol::ast::Call,
input: nu_protocol::PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
let head = call.head;
let args = Arguments {
columns: call.get_flag(engine_state, stack, "columns")?,
pwd: current_dir(engine_state, stack)?,
};
input.map(
move |value| super::operate(&exists, &args, value, head),
engine_state.ctrlc.clone(),
)
}
#[cfg(windows)]
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Check if a file exists",
example: "'C:\\Users\\joe\\todo.txt' | path exists",
result: Some(Value::boolean(false, Span::test_data())),
},
Example {
description: "Check if a file exists in a column",
example: "ls | path exists -c [ name ]",
result: None,
},
]
}
#[cfg(not(windows))]
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Check if a file exists",
example: "'/home/joe/todo.txt' | path exists",
result: Some(Value::boolean(false, Span::test_data())),
},
Example {
description: "Check if a file exists in a column",
example: "ls | path exists -c [ name ]",
result: None,
},
]
}
}
fn exists(path: &Path, span: Span, args: &Arguments) -> Value {
let path = expand_path_with(path, &args.pwd);
Value::Bool {
val: match path.try_exists() {
Ok(exists) => exists,
Err(err) => return Value::Error { error: err.into() },
},
span,
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_examples() {
use crate::test_examples;
test_examples(SubCommand {})
}
}