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pub use which::which;
use std::{
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(binary_name: &str) -> bool {
which::which(binary_name).is_ok()
}
#[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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