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use std::cmp;
use std::fmt;
use std::io;
use std::path::{Path, PathBuf};
#[cfg(unix)]
use crate::os::unix as os;
#[cfg(windows)]
use crate::os::windows as os;
#[derive(Debug)]
pub struct Cursor {
options: Options,
stack: Vec<DirCursor>,
root: bool,
current: PathBuf,
file_type: Option<FileType>,
}
impl Cursor {
pub fn new<P: Into<PathBuf>>(root: P) -> Cursor {
Cursor {
options: Options::default(),
stack: vec![],
root: true,
current: root.into(),
file_type: None,
}
}
pub fn reset<P: Into<PathBuf>>(root: P) {
unimplemented!()
}
pub fn read(&mut self) -> io::Result<Option<CursorEntry>> {
if let Some(ft) = self.file_type.take() {
if !ft.is_dir() {
self.current.pop();
}
} else {
let ft = os::stat(self.current.clone())?.file_type().into_api();
if ft.is_dir() {
self.push();
}
self.file_type = Some(ft);
return Ok(Some(CursorEntry { cursor: self }));
}
while !self.stack.is_empty() {
let dcur = self.stack.last_mut().unwrap();
match dcur.read() {
None => {
self.stack.pop().unwrap();
// If the stack is empty, then we've reached the root.
// At this point, `current` is just the original root path,
// so we should not pop anything from it.
if !self.stack.is_empty() {
self.current.pop();
}
}
Some(Err(err)) => return Err(err),
Some(Ok(dent)) => {
let name = dent.file_name_os();
if name == "." || name == ".." {
continue;
}
self.current.push(name);
self.file_type =
Some(dent.file_type().unwrap().into_api());
if dent.file_type().unwrap().is_dir() {
self.push();
}
return Ok(Some(CursorEntry { cursor: self }));
}
}
}
Ok(None)
}
fn push(&mut self) {
let res = os::Dir::open(self.current.clone());
self.stack.push(DirCursor(res.map_err(Some)));
}
}
#[derive(Debug)]
struct DirCursor(Result<os::Dir, Option<io::Error>>);
impl DirCursor {
fn read(&mut self) -> Option<io::Result<os::DirEntry>> {
match self.0 {
Err(ref mut err) => err.take().map(Err),
Ok(ref mut dir) => dir.read(),
}
}
}
#[derive(Debug)]
pub struct CursorEntry<'a> {
cursor: &'a mut Cursor,
}
impl<'a> CursorEntry<'a> {
pub fn path(&self) -> &Path {
&self.cursor.current
}
pub fn file_type(&self) -> FileType {
self.cursor.file_type.unwrap()
}
}
#[derive(Debug)]
struct Options {
follow_links: bool,
max_open: usize,
min_depth: usize,
max_depth: usize,
sorter: Option<Sorter>,
contents_first: bool,
same_file_system: bool,
}
impl Default for Options {
fn default() -> Options {
Options {
follow_links: false,
max_open: 10,
min_depth: 0,
max_depth: std::usize::MAX,
sorter: None,
contents_first: false,
same_file_system: false,
}
}
}
struct Sorter(
Box<FnMut(&DirEntry, &DirEntry) -> cmp::Ordering + Send + Sync + 'static>,
);
impl fmt::Debug for Sorter {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "<sort function>")
}
}
#[derive(Debug)]
pub struct DirEntry {
os: os::DirEntry,
file_type: FileType,
}
impl DirEntry {}
#[derive(Clone, Copy, Debug)]
pub struct FileType(os::FileType);
impl FileType {
pub fn is_file(&self) -> bool {
self.0.is_file()
}
pub fn is_dir(&self) -> bool {
self.0.is_dir()
}
pub fn is_symlink(&self) -> bool {
self.0.is_symlink()
}
}
impl From<os::FileType> for FileType {
fn from(osft: os::FileType) -> FileType {
FileType(osft)
}
}
|
