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use std::{
ffi::OsStr,
path::{Path, PathBuf},
sync::RwLock,
};
static CWD: RwLock<Option<PathBuf>> = RwLock::new(None);
// Get the current working directory.
// This information is managed internally as the call to std::env::current_dir
// might fail if the cwd has been deleted.
pub fn current_working_dir() -> PathBuf {
if let Some(path) = &*CWD.read().unwrap() {
return path.clone();
}
let path = std::env::current_dir()
.map(crate::path::normalize)
.expect("Couldn't determine current working directory");
let mut cwd = CWD.write().unwrap();
*cwd = Some(path.clone());
path
}
pub fn set_current_working_dir(path: impl AsRef<Path>) -> std::io::Result<()> {
let path = crate::path::canonicalize(path);
std::env::set_current_dir(&path)?;
let mut cwd = CWD.write().unwrap();
*cwd = Some(path);
Ok(())
}
pub fn env_var_is_set(env_var_name: &str) -> bool {
std::env::var_os(env_var_name).is_some()
}
pub fn binary_exists<T: AsRef<OsStr>>(binary_name: T) -> bool {
which::which(binary_name).is_ok()
}
pub fn which<T: AsRef<OsStr>>(
binary_name: T,
) -> Result<std::path::PathBuf, ExecutableNotFoundError> {
which::which(binary_name.as_ref()).map_err(|err| ExecutableNotFoundError {
command: binary_name.as_ref().to_string_lossy().into_owned(),
inner: err,
})
}
#[derive(Debug)]
pub struct ExecutableNotFoundError {
command: String,
inner: which::Error,
}
impl std::fmt::Display for ExecutableNotFoundError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "command '{}' not found: {}", self.command, self.inner)
}
}
impl std::error::Error for ExecutableNotFoundError {}
#[cfg(test)]
mod tests {
use super::{current_working_dir, set_current_working_dir};
#[test]
fn current_dir_is_set() {
let new_path = dunce::canonicalize(std::env::temp_dir()).unwrap();
let cwd = current_working_dir();
assert_ne!(cwd, new_path);
set_current_working_dir(&new_path).expect("Couldn't set new path");
let cwd = current_working_dir();
assert_eq!(cwd, new_path);
}
}
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