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use std::{
borrow::Borrow,
ops::{Deref, DerefMut},
path::PathBuf,
};
/// Directory Pointer Data
pub trait DirPtrData {
/// Fix the given path
///
/// Returns Some(path): use the fixed path
/// Returns None: path cannot be fixed, this pointer is invalid
#[doc(hidden)]
fn fix(raw_path: PathBuf) -> Option<PathBuf>;
}
#[derive(Debug, Default, Clone)]
pub struct DirPtr<Data: DirPtrData> {
/// Whether the current directory pointer is valid
valid: bool,
/// Data for the directory pointer
data: Data,
/// Path to the directory
path: PathBuf,
}
impl<Data: DirPtrData> DirPtr<Data> {
/// Get a reference to the directory pointer's path
pub fn path_ref(&self) -> &PathBuf {
&self.path
}
/// Get the directory pointer's path
pub fn path(&self) -> PathBuf {
self.path.clone()
}
/// Returns whether the directory pointer is valid
pub fn is_valid(&self) -> bool {
self.valid
}
}
impl<Data: DirPtrData + Default> DirPtr<Data> {
/// Create a new directory pointer with the given path and default data
pub fn new(path: impl Into<PathBuf>) -> Self {
let path = path.into();
let fixed = Data::fix(path.clone());
Self {
valid: fixed.is_some(),
data: Data::default(),
path: fixed.unwrap_or(path),
}
}
}
impl<Data: DirPtrData> AsRef<DirPtr<Data>> for DirPtr<Data> {
fn as_ref(&self) -> &DirPtr<Data> {
self
}
}
impl<Data: DirPtrData> Deref for DirPtr<Data> {
type Target = Data;
fn deref(&self) -> &Self::Target {
&self.data
}
}
impl<Data: DirPtrData> DerefMut for DirPtr<Data> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.data
}
}
impl<Data: DirPtrData> Borrow<Data> for DirPtr<Data> {
fn borrow(&self) -> &Data {
&self.data
}
}
/// Create a new directory pointer with the given path and default data
pub fn dir_ptr<Data: DirPtrData + Default>(path: impl Into<PathBuf>) -> DirPtr<Data> {
DirPtr::new(path)
}
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