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use std::{
env::current_dir,
path::{Path, PathBuf},
};
/// A global resource for the Mingling library that provides the current working directory.
///
/// This struct wraps a `PathBuf` representing the current working directory at the time of
/// creation. It is used as a shared resource in the Mingling framework so that multiple
/// components can access the same base directory without repeatedly querying the OS.
///
/// # Default behavior
///
/// The `Default` implementation calls `std::env::current_dir().unwrap()` internally, which will
/// **panic** if the current directory cannot be determined (e.g., if it has been deleted). If
/// you want to handle this error gracefully, use [`ResCurrentDir::new`] instead, which returns
/// a `Result`.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ResCurrentDir {
cwd: PathBuf
}
impl ResCurrentDir {
/// Creates a new `ResCurrentDir` by querying the OS for the current working directory.
///
/// Returns `Err` if the current directory cannot be determined (e.g., the directory has been
/// deleted or permissions are insufficient). Unlike the `Default` implementation, this
/// method does not panic on failure.
pub fn new() -> Result<Self, std::io::Error> {
Ok(Self { cwd: current_dir()? })
}
}
impl Default for ResCurrentDir {
fn default() -> Self {
Self { cwd: current_dir().unwrap() }
}
}
impl From<PathBuf> for ResCurrentDir {
fn from(path: PathBuf) -> Self {
Self { cwd: path }
}
}
impl From<&Path> for ResCurrentDir {
fn from(path: &Path) -> Self {
Self { cwd: path.to_path_buf() }
}
}
impl From<&PathBuf> for ResCurrentDir {
fn from(path: &PathBuf) -> Self {
Self { cwd: path.clone() }
}
}
impl From<ResCurrentDir> for PathBuf {
fn from(res: ResCurrentDir) -> Self {
res.cwd
}
}
impl AsRef<Path> for ResCurrentDir {
fn as_ref(&self) -> &Path {
self.cwd.as_path()
}
}
impl std::ops::Deref for ResCurrentDir {
type Target = PathBuf;
fn deref(&self) -> &Self::Target {
&self.cwd
}
}
impl std::ops::DerefMut for ResCurrentDir {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.cwd
}
}
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