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use core::ops::Range;
use crate::{self as sys, Fd, FdExt, dir_iterator};
use bun_alloc::AllocError;
use bun_core::slice_as_bytes;
use bun_paths::{OSPathChar, OSPathSlice, OSPathSliceZ, SEP};
use bun_wyhash::Wyhash11;
#[inline]
fn hash_with_seed(seed: u64, bytes: &[u8]) -> u64 {
Wyhash11::hash(seed, bytes)
}
// TODO(port): `DirIterator.NewWrappedIterator(if (Environment.isWindows) .u16 else .u8)` —
// `dir_iterator::WrappedIterator` is parameterized on the native OS path char in Zig.
type WrappedIterator = dir_iterator::WrappedIterator;
type NameBufferList = Vec<OSPathChar>;
pub struct Walker {
stack: Vec<StackItem>,
name_buffer: NameBufferList,
// PORT NOTE: reshaped for borrowck — Zig stored `skip_filenames`/`skip_dirnames` as
// sub-slices borrowed from `skip_all`. Rust stores index ranges into `skip_all` instead
// (self-referential slices are not expressible without raw pointers).
skip_filenames: Range<usize>,
skip_dirnames: Range<usize>,
skip_all: Box<[u64]>,
seed: u64,
pub resolve_unknown_entry_types: bool,
}
pub struct WalkerEntry<'a> {
/// The containing directory. This can be used to operate directly on `basename`
/// rather than `path`, avoiding `error.NameTooLong` for deeply nested paths.
/// The directory remains open until `next` or `deinit` is called.
pub dir: Fd,
pub basename: &'a OSPathSliceZ,
pub path: &'a OSPathSliceZ,
// PORT NOTE: Zig used `std.fs.Dir.Entry.Kind`; mapped to `bun_core::FileKind`
// (re-exported as `crate::EntryKind`).
pub kind: sys::EntryKind,
}
struct StackItem {
iter: WrappedIterator,
dirname_len: usize,
}
impl Walker {
/// After each call to this function, and on deinit(), the memory returned
/// from this function becomes invalid. A copy must be made in order to keep
/// a reference to the path.
pub fn next(&mut self) -> sys::Result<Option<WalkerEntry<'_>>> {
while !self.stack.is_empty() {
// `top` becomes invalid after appending to `self.stack`
// PORT NOTE: reshaped for borrowck — use index instead of holding `&mut` across push.
let top_idx = self.stack.len() - 1;
let mut dirname_len = self.stack[top_idx].dirname_len;
match self.stack[top_idx].iter.next() {
Err(err) => return Err(err),
Ok(res) => {
if let Some(base) = res {
// Some filesystems (NFS, FUSE, bind mounts) don't provide
// d_type and return DT_UNKNOWN. Optionally resolve via
// fstatat so callers get accurate types for recursion.
// This only affects POSIX; Windows always provides types.
#[cfg(not(windows))]
let kind: sys::EntryKind = if base.kind == sys::EntryKind::Unknown
&& self.resolve_unknown_entry_types
{
let dir_fd = self.stack[top_idx].iter.dir();
// TODO(port): `base.name.sliceAssumeZ()` — assumed `.as_zstr()`
match sys::lstatat(dir_fd, base.name.as_zstr()) {
Ok(stat_buf) => sys::kind_from_mode(stat_buf.st_mode as sys::Mode),
Err(_) => continue, // skip entries we can't stat
}
} else {
base.kind
};
#[cfg(windows)]
let kind: sys::EntryKind = base.kind;
match kind {
sys::EntryKind::Directory => {
let skip = &self.skip_all[self.skip_dirnames.clone()];
if skip.contains(
// avoid hashing if there will be 0 results
&(if !skip.is_empty() {
hash_with_seed(
self.seed,
slice_as_bytes(base.name.as_slice()),
)
} else {
0
}),
) {
continue;
}
}
sys::EntryKind::File => {
let skip = &self.skip_all[self.skip_filenames.clone()];
if skip.contains(
// avoid hashing if there will be 0 results
&(if !skip.is_empty() {
hash_with_seed(
self.seed,
slice_as_bytes(base.name.as_slice()),
)
} else {
0
}),
) {
continue;
}
}
// we don't know what it is for a symlink
sys::EntryKind::SymLink => {
let skip = &self.skip_all[..];
if skip.contains(
// avoid hashing if there will be 0 results
&(if !skip.is_empty() {
hash_with_seed(
self.seed,
slice_as_bytes(base.name.as_slice()),
)
} else {
0
}),
) {
continue;
}
}
_ => {}
}
self.name_buffer.truncate(dirname_len);
if !self.name_buffer.is_empty() {
self.name_buffer.push(SEP as OSPathChar);
dirname_len += 1;
}
self.name_buffer.extend_from_slice(base.name.as_slice());
let cur_len = self.name_buffer.len();
self.name_buffer.push(0);
let mut top_idx = top_idx;
if kind == sys::EntryKind::Directory {
let new_dir = sys::open_dir_for_iteration_os_path(
self.stack[top_idx].iter.dir(),
base.name.as_slice(),
)?;
{
self.stack.push(StackItem {
// TODO(port): Zig passed encoding `if windows .u16 else .u8`;
// assumed native-encoding overload.
iter: dir_iterator::iterate(new_dir),
dirname_len: cur_len,
});
top_idx = self.stack.len() - 1;
}
}
// `name_buffer[cur_len] == 0` was written above; both views end at
// `cur_len` and are NUL-terminated by that sentinel char. `from_buf`
// ties the borrow to `&self.name_buffer` (no raw-pointer reslice).
return Ok(Some(WalkerEntry {
dir: self.stack[top_idx].iter.dir(),
basename: OSPathSliceZ::from_buf(
&self.name_buffer[dirname_len..],
cur_len - dirname_len,
),
path: OSPathSliceZ::from_buf(&self.name_buffer, cur_len),
kind,
}));
} else {
let item = self.stack.pop().unwrap();
if !self.stack.is_empty() {
item.iter.dir().close();
}
}
}
}
}
Ok(None)
}
}
impl Drop for Walker {
fn drop(&mut self) {
if !self.stack.is_empty() {
for item in &mut self.stack[1..] {
// Zig had `if (self.stack.items.len != 0)` here, which is always true inside
// this branch — preserved as-is.
item.iter.dir().close();
}
// `self.stack` Vec drops itself.
}
// `self.skip_all` (Box<[u64]>) and `self.name_buffer` (Vec) drop themselves.
}
}
/// Recursively iterates over a directory.
/// `self` must have been opened with `OpenDirOptions{.iterate = true}`.
/// Must call `Walker.deinit` when done.
/// The order of returned file system entries is undefined.
/// `self` will not be closed after walking it.
pub fn walk(
self_: Fd,
skip_filenames: &[&OSPathSlice],
skip_dirnames: &[&OSPathSlice],
) -> Result<Walker, AllocError> {
let name_buffer = NameBufferList::new();
let mut stack: Vec<StackItem> = Vec::new();
let mut skip_names = vec![0u64; skip_filenames.len() + skip_dirnames.len()].into_boxed_slice();
let seed = (skip_filenames.len() + skip_dirnames.len()) as u64;
let mut skip_name_i: usize = 0;
for name in skip_filenames {
skip_names[skip_name_i] = hash_with_seed(seed, slice_as_bytes(name));
skip_name_i += 1;
}
let skip_filenames_ = 0..skip_name_i;
let skip_dirnames_ = skip_name_i..skip_names.len();
for (i, name) in skip_dirnames.iter().enumerate() {
skip_names[skip_name_i + i] = hash_with_seed(seed, slice_as_bytes(name));
}
stack.push(StackItem {
// TODO(port): Zig passed encoding `if windows .u16 else .u8`; assumed native-encoding overload.
iter: dir_iterator::iterate(self_),
dirname_len: 0,
});
Ok(Walker {
stack,
name_buffer,
skip_all: skip_names,
seed,
skip_filenames: skip_filenames_,
skip_dirnames: skip_dirnames_,
resolve_unknown_entry_types: false,
})
}
// ported from: src/sys/walker_skippable.zig