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Lots of polish. Docs. Refactoring. Simplifying.

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Andrew Gallant 2015-09-27 00:59:19 -04:00
parent 4918e08926
commit daf1ee1f24
14 changed files with 1133 additions and 629 deletions
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9
.travis.yml Normal file
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language: rust
rust:
- 1.3.0
- beta
- nightly
script:
- cargo build --verbose
- cargo test --verbose
- cargo doc

3
COPYING Normal file
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This project is dual-licensed under the Unlicense and MIT licenses.
You may use this code under the terms of either license.

2
Cargo.toml
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@ -8,7 +8,7 @@ homepage = "https://github.com/BurntSushi/walkdir"
repository = "https://github.com/BurntSushi/walkdir"
readme = "README.md"
keywords = ["directory", "recursive", "walk", "iterator"]
license = "MIT/Apache-2.0"
license = "Unlicense/MIT"
[dependencies]
libc = "0.1"

201
LICENSE-APACHE
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@ -1,201 +0,0 @@
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40
LICENSE-MIT
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@ -1,25 +1,21 @@
Copyright (c) 2014 The Rust Project Developers
The MIT License (MIT)
Permission is hereby granted, free of charge, to any
person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the
Software without restriction, including without
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conditions:
Copyright (c) 2015 Andrew Gallant
The above copyright notice and this permission notice
shall be included in all copies or substantial portions
of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
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TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

137
README.md
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@ -1,6 +1,139 @@
walkdir
=======
A cross platform Rust library for efficiently walking a directory recursively.
Comes with support for following symbolic links, controlling the number of file
descriptors and efficient mechanisms for pruning the entries in the directory
tree.
A Rust library for efficiently walking a directory recursively.
[![Build status](https://api.travis-ci.org/BurntSushi/walkdir.png)](https://travis-ci.org/BurntSushi/walkdir)
[![](http://meritbadge.herokuapp.com/walkdir)](https://crates.io/crates/walkdir)
This is a work in progress and is (hopefully) destined for `std::fs`.
Dual-licensed under MIT or the [UNLICENSE](http://unlicense.org).
### Documentation
[http://burntsushi.net/rustdoc/walkdir/](http://burntsushi.net/rustdoc/walkdir/)
### Usage
To use this crate, add `walkdir` as a dependency to your project's
`Cargo.toml`:
```
[dependencies]
walkdir = "0.1"
```
### Example
The following code recursively iterates over the directory given and prints
the path for each entry:
```rust,no_run
use walkdir::WalkDir;
for entry in WalkDir::new("foo") {
let entry = entry.unwrap();
println!("{}", entry.path().display());
}
```
Or, if you'd like to iterate over all entries and ignore any errors that may
arise, use `filter_map`. (e.g., This code below will silently skip directories
that the owner of the running process does not have permission to access.)
```rust,no_run
use walkdir::WalkDir;
for entry in WalkDir::new("foo").into_iter().filter_map(|e| e.ok()) {
println!("{}", entry.path().display());
}
```
### Example: follow symbolic links
The same code as above, except `follow_links` is enabled:
```rust,no_run
use walkdir::WalkDir;
for entry in WalkDir::new("foo").follow_links(true) {
let entry = entry.unwrap();
println!("{}", entry.path().display());
}
```
### Example: skip hidden files and directories efficiently on unix
This uses the `filter_entry` iterator adapter to avoid yielding hidden files
and directories efficiently:
```rust,no_run
use walkdir::{DirEntry, WalkDir, WalkDirIterator};
fn is_hidden(entry: &DirEntry) -> bool {
entry.file_name()
.to_str()
.map(|s| s.starts_with("."))
.unwrap_or(false)
}
let walker = WalkDir::new("foo").into_iter();
for entry in walker.filter_entry(|e| !is_hidden(e)) {
let entry = entry.unwrap();
println!("{}", entry.path().display());
}
```
### Motivation
`std::fs` has an unstable `walk_dir` implementation that needed some design
work. I started off on that task, but it quickly became apparent that walking
a directory recursively is quite complex and may not be a good fit for `std`
right away.
This should at least resolve most or all of the issues reported here (and then
some):
* https://github.com/rust-lang/rust/issues/27707
* https://github.com/rust-lang/rust/issues/23715
### Performance
The short story is that performance is comparable with `find` and glibc's
`nftw` on both a warm and cold file cache. In fact, I cannot observe any
performance difference after running `find /`, `walkdir /` and `nftw /` on my
local file system (SSD, ~3 million entries). More precisely, I am reasonably
confident that this crate makes as few system calls and close to as few
allocations as possible.
I haven't recorded any benchmarks, but here are some things you can try with a
local checkout of `walkdir`:
```
# The directory you want to recursively walk:
DIR=$HOME
# If you want to observe perf on a cold file cache, run this before *each*
# command:
sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
# To warm the caches
find $HOME
# Test speed of `find` on warm cache:
time find $HOME
# Compile and test speed of `walkdir` crate:
cargo build --release --example walkdir
time ./target/release/examples/walkdir $DIR
# Compile and test speed of glibc's `nftw`:
gcc -O3 -o nftw ./compare/nftw.c
time ./nftw $DIR
# For shits and giggles, test speed of Python's (2 or 3) os.walk:
time python ./compare/walk.py $DIR
```
On my system, the performance of `walkdir`, `find` and `nftw` is comparable.

24
UNLICENSE Normal file
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@ -0,0 +1,24 @@
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.
In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
For more information, please refer to <http://unlicense.org/>

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appveyor.yml Normal file
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environment:
matrix:
- TARGET: x86_64-pc-windows-msvc
- TARGET: i686-pc-windows-msvc
- TARGET: i686-pc-windows-gnu
install:
- ps: Start-FileDownload "https://static.rust-lang.org/dist/rust-nightly-${env:TARGET}.exe"
- rust-nightly-%TARGET%.exe /VERYSILENT /NORESTART /DIR="C:\Program Files (x86)\Rust"
- SET PATH=%PATH%;C:\Program Files (x86)\Rust\bin
- SET PATH=%PATH%;C:\MinGW\bin
- rustc -V
- cargo -V
build: false
test_script:
- cargo build --verbose
- cargo test --verbose

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compare/nftw.c Normal file
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@ -0,0 +1,25 @@
#define _XOPEN_SOURCE 500
#include <ftw.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
static int
display_info(const char *fpath, const struct stat *sb,
int tflag, struct FTW *ftwbuf)
{
printf("%s\n", fpath);
return 0;
}
int
main(int argc, char *argv[])
{
int flags = FTW_PHYS;
if (nftw((argc < 2) ? "." : argv[1], display_info, 20, flags) == -1) {
perror("nftw");
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}

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compare/walk.py Normal file
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@ -0,0 +1,10 @@
from __future__ import absolute_import, division, print_function
import os
import sys
for dirpath, dirnames, filenames in os.walk(sys.argv[1]):
for n in dirnames:
print(os.path.join(dirpath, n))
for n in filenames:
print(os.path.join(dirpath, n))

53
examples/walkdir.rs
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@ -2,6 +2,8 @@ extern crate docopt;
extern crate rustc_serialize;
extern crate walkdir;
use std::io::{self, Write};
use docopt::Docopt;
use walkdir::WalkDir;
@ -12,11 +14,11 @@ Usage:
Options:
-h, --help
-L, --follow-links Follow symlinks.
-d, --depth Traverse contents of directories first.
--min-depth NUM Minimum depth.
--max-depth NUM Maximum depth.
-n, --fd-max NUM Maximum open file descriptors. [default: 32]
--tree Show output as a tree.
-q, --ignore-errors Ignore errors.
";
#[derive(Debug, RustcDecodable)]
@ -27,37 +29,50 @@ struct Args {
flag_min_depth: Option<usize>,
flag_max_depth: Option<usize>,
flag_fd_max: usize,
flag_depth: bool,
flag_tree: bool,
flag_ignore_errors: bool,
}
macro_rules! wout { ($($tt:tt)*) => { {writeln!($($tt)*)}.unwrap() } }
fn main() {
let args: Args = Docopt::new(USAGE).and_then(|d| d.decode())
.unwrap_or_else(|e| e.exit());
let mind = args.flag_min_depth.unwrap_or(0);
let maxd = args.flag_max_depth.unwrap_or(::std::usize::MAX);
let mut it = WalkDir::new(args.arg_dir.unwrap_or(".".to_owned()))
.max_open(args.flag_fd_max)
.follow_links(args.flag_follow_links)
.contents_first(args.flag_depth)
.min_depth(mind)
.max_depth(maxd)
.into_iter();
let it = WalkDir::new(args.arg_dir.clone().unwrap_or(".".to_owned()))
.max_open(args.flag_fd_max)
.follow_links(args.flag_follow_links)
.min_depth(mind)
.max_depth(maxd)
.into_iter();
let mut out = io::BufWriter::new(io::stdout());
let mut eout = io::stderr();
if args.flag_tree {
loop {
let dent = match it.next() {
None => break,
Some(Err(err)) => { println!("ERROR: {}", err); continue }
Some(Ok(dent)) => dent,
};
let name = dent.file_name().into_string().unwrap();
println!("{}{}", indent(it.depth()), name);
for dent in it {
match dent {
Err(err) => {
out.flush().unwrap();
wout!(eout, "ERROR: {}", err);
}
Ok(dent) => {
let name = dent.file_name().to_string_lossy();
wout!(out, "{}{}", indent(dent.depth()), name);
}
}
}
} else if args.flag_ignore_errors {
for dent in it.filter_map(|e| e.ok()) {
wout!(out, "{}", dent.path().display());
}
} else {
for dent in it {
match dent {
Ok(dent) => println!("{}", dent.path().display()),
Err(err) => println!("ERROR: {}", err),
Err(err) => {
out.flush().unwrap();
wout!(eout, "ERROR: {}", err);
}
Ok(dent) => wout!(out, "{}", dent.path().display()),
}
}
}

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src/lib.rs
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24
src/same_file.rs
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@ -1,9 +1,9 @@
use std::io;
use std::path::Path;
// Below are platform specific functions for testing the equality of two
// files. Namely, we want to know whether the two paths points to precisely
// the same underlying file object.
// Below are platform specific functions for testing the equality of two files.
// Namely, we want to know whether two paths points to precisely the same
// underlying file object.
//
// In our particular use case, the paths should only be directories. If we're
// assuming that directories cannot be hard linked, then it seems like equality
@ -11,7 +11,8 @@ use std::path::Path;
//
// I'd also note that other popular libraries (Java's NIO and Boost) expose
// a function like `is_same_file` whose implementation is similar. (i.e., check
// dev/inode on Unix and check `nFileIndex{High,Low}` on Windows.)
// dev/inode on Unix and check `nFileIndex{High,Low}` on Windows.) So this may
// be a candidate for extracting into a separate crate.
//
// ---AG
@ -119,9 +120,9 @@ where P: AsRef<Path>, Q: AsRef<Path> {
s.as_os_str().encode_wide().chain(Some(0)).collect()
}
// For correctness, it is critical that both file handles remain open
// while their attributes are checked for equality. In particular,
// the file index numbers are not guaranteed to remain stable over time.
// For correctness, it is critical that both file handles remain open while
// their attributes are checked for equality. In particular, the file index
// numbers are not guaranteed to remain stable over time.
//
// See the docs and remarks on MSDN:
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa363788(v=vs.85).aspx
@ -133,8 +134,8 @@ where P: AsRef<Path>, Q: AsRef<Path> {
// https://msdn.microsoft.com/en-us/library/windows/desktop/hh802691(v=vs.85).aspx
//
// It seems straight-forward enough to modify this code to use
// `FILE_ID_INFO` when available (minimum Windows Server 2012), but
// I don't have access to such Windows machines.
// `FILE_ID_INFO` when available (minimum Windows Server 2012), but I don't
// have access to such Windows machines.
//
// Two notes.
//
@ -144,7 +145,7 @@ where P: AsRef<Path>, Q: AsRef<Path> {
// `nFileIndex{Low,High}` are not unique.
//
// 2. LLVM has a bug where they fetch the id of a file and continue to use
// it even after the file has been closed, so that uniqueness is no
// it even after the handle has been closed, so that uniqueness is no
// longer guaranteed (when `nFileIndex{Low,High}` are unique).
// bug report: http://lists.llvm.org/pipermail/llvm-bugs/2014-December/037218.html
//
@ -156,7 +157,8 @@ where P: AsRef<Path>, Q: AsRef<Path> {
// In the case where this code is erroneous, two files will be reported
// as equivalent when they are in fact distinct. This will cause the loop
// detection code to report a false positive, which will prevent descending
// into the offending directory.
// into the offending directory. As far as failure modes goes, this isn't
// that bad.
let h1 = try!(open_read_attr(&p1));
let h2 = try!(open_read_attr(&p2));
let i1 = try!(file_info(&h1));

141
src/tests.rs
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@ -1,7 +1,6 @@
#![allow(dead_code, unused_imports)]
#![cfg_attr(windows, allow(dead_code, unused_imports))]
use std::env;
use std::fmt;
use std::fs::{self, File};
use std::io;
use std::path::{Path, PathBuf};
@ -9,7 +8,7 @@ use std::path::{Path, PathBuf};
use quickcheck::{Arbitrary, Gen, QuickCheck, StdGen};
use rand::{self, Rng};
use super::{DirEntry, WalkDir, WalkDirError, WalkDirIter};
use super::{DirEntry, WalkDir, WalkDirIterator, Iter, Error, ErrorInner};
#[derive(Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
enum Tree {
@ -19,15 +18,11 @@ enum Tree {
}
impl Tree {
fn from_walk<P: AsRef<Path>>(p: P) -> io::Result<Tree> {
Tree::from_walk_with(p, |wd| wd)
}
fn from_walk_with<P, F>(
p: P,
f: F,
) -> io::Result<Tree>
where P: AsRef<Path>, F: FnOnce(WalkDir<P>) -> WalkDir<P> {
where P: AsRef<Path>, F: FnOnce(WalkDir) -> WalkDir {
let mut stack = vec![Tree::Dir(p.as_ref().to_path_buf(), vec![])];
let it: WalkEventIter = f(WalkDir::new(p)).into();
for ev in it {
@ -43,7 +38,7 @@ impl Tree {
stack.push(Tree::Dir(pb(dent.file_name()), vec![]));
}
WalkEvent::File(dent) => {
let node = if try!(dent.file_type()).is_symlink() {
let node = if dent.file_type().is_symlink() {
let src = try!(fs::read_link(dent.path()));
let dst = pb(dent.file_name());
Tree::Symlink(src, dst)
@ -222,42 +217,6 @@ impl Arbitrary for Tree {
}
}
/*
impl fmt::Debug for Tree {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fn rep(c: char, n: usize) -> String {
::std::iter::repeat(c).take(n).collect()
}
fn fmt(
f: &mut fmt::Formatter,
tree: &Tree,
depth: usize,
) -> fmt::Result {
match *tree {
Tree::File(ref pb) => {
writeln!(f, "{}{}", rep(' ', 2 * depth), pb.display())
}
Tree::Symlink(ref src, ref dst) => {
writeln!(f, "{}{} -> {}",
rep(' ', 2 * depth),
dst.display(), src.display())
}
Tree::Dir(ref pb, ref children) => {
try!(writeln!(f, "{}{}",
rep(' ', 2 * depth), pb.display()));
for c in children {
try!(fmt(f, c, depth + 1));
}
Ok(())
}
}
}
fmt(f, self, 0)
}
}
*/
#[derive(Debug)]
enum WalkEvent {
Dir(DirEntry),
@ -267,12 +226,12 @@ enum WalkEvent {
struct WalkEventIter {
depth: usize,
it: WalkDirIter,
next: Option<Result<DirEntry, WalkDirError>>,
it: Iter,
next: Option<Result<DirEntry, Error>>,
}
impl<P: AsRef<Path>> From<WalkDir<P>> for WalkEventIter {
fn from(it: WalkDir<P>) -> WalkEventIter {
impl From<WalkDir> for WalkEventIter {
fn from(it: WalkDir) -> WalkEventIter {
WalkEventIter { depth: 0, it: it.into_iter(), next: None }
}
}
@ -282,26 +241,26 @@ impl Iterator for WalkEventIter {
fn next(&mut self) -> Option<io::Result<WalkEvent>> {
let dent = self.next.take().or_else(|| self.it.next());
if self.it.depth() < self.depth {
let depth = match dent {
None => 0,
Some(Ok(ref dent)) => dent.depth(),
Some(Err(ref err)) => err.depth(),
};
if depth < self.depth {
self.depth -= 1;
self.next = dent;
return Some(Ok(WalkEvent::Exit));
}
self.depth = self.it.depth();
self.depth = depth;
match dent {
None => None,
Some(Err(err)) => Some(Err(From::from(err))),
Some(Ok(dent)) => {
match dent.file_type() {
Err(err) => Some(Err(err)),
Ok(ty) => {
if ty.is_dir() {
self.depth += 1;
Some(Ok(WalkEvent::Dir(dent)))
} else {
Some(Ok(WalkEvent::File(dent)))
}
}
if dent.file_type().is_dir() {
self.depth += 1;
Some(Ok(WalkEvent::Dir(dent)))
} else {
Some(Ok(WalkEvent::File(dent)))
}
}
}
@ -311,10 +270,6 @@ impl Iterator for WalkEventIter {
struct TempDir(PathBuf);
impl TempDir {
fn join(&self, path: &str) -> PathBuf {
(&*self.0).join(path)
}
fn path<'a>(&'a self) -> &'a Path {
&self.0
}
@ -335,11 +290,11 @@ fn tmpdir() -> TempDir {
}
fn dir_setup_with<F>(t: &Tree, f: F) -> (TempDir, Tree)
where F: FnOnce(WalkDir<&Path>) -> WalkDir<&Path> {
where F: FnOnce(WalkDir) -> WalkDir {
let tmp = tmpdir();
t.create_in(tmp.path()).unwrap();
let got = Tree::from_walk_with(tmp.path(), f).unwrap();
(tmp, got.unwrap_singleton())
(tmp, got.unwrap_singleton().unwrap_singleton())
}
fn dir_setup(t: &Tree) -> (TempDir, Tree) {
@ -366,6 +321,10 @@ fn soft_link<P: AsRef<Path>, Q: AsRef<Path>>(
symlink(src, dst)
}
// TODO: Figure out how to do symlinks on windows.
// Windows differentiates dir and file symlinks.
// We may need to tweak the `Tree` data type to
// split links into dir/file.
#[cfg(windows)]
fn soft_link<P: AsRef<Path>, Q: AsRef<Path>>(
_src: P,
@ -498,10 +457,10 @@ fn walk_dir_sym_detect_loop() {
.collect::<Result<Vec<_>, _>>();
match got {
Ok(x) => panic!("expected loop error, got no error: {:?}", x),
Err(WalkDirError::Io { .. }) => {
Err(Error { inner: ErrorInner::Io { .. }, .. }) => {
panic!("expected loop error, got generic IO error");
}
Err(WalkDirError::Loop { .. }) => {}
Err(Error { inner: ErrorInner::Loop { .. }, .. }) => {}
}
}
@ -517,10 +476,10 @@ fn walk_dir_sym_infinite() {
.collect::<Result<Vec<_>, _>>();
match got {
Ok(x) => panic!("expected IO error, got no error: {:?}", x),
Err(WalkDirError::Loop { .. }) => {
Err(Error { inner: ErrorInner::Loop { .. }, .. }) => {
panic!("expected IO error, but got loop error");
}
Err(WalkDirError::Io { .. }) => {}
Err(Error { inner: ErrorInner::Io { .. }, .. }) => {}
}
}
@ -536,7 +495,7 @@ fn walk_dir_min_depth_2() {
let exp = td("foo", vec![tf("bar"), tf("baz")]);
let tmp = tmpdir();
exp.create_in(tmp.path()).unwrap();
let got = Tree::from_walk_with(tmp.path(), |wd| wd.min_depth(1))
let got = Tree::from_walk_with(tmp.path(), |wd| wd.min_depth(2))
.unwrap().unwrap_dir();
assert_tree_eq!(exp, td("foo", got));
}
@ -550,7 +509,7 @@ fn walk_dir_min_depth_3() {
]);
let tmp = tmpdir();
exp.create_in(tmp.path()).unwrap();
let got = Tree::from_walk_with(tmp.path(), |wd| wd.min_depth(2))
let got = Tree::from_walk_with(tmp.path(), |wd| wd.min_depth(3))
.unwrap().unwrap_dir();
assert_eq!(vec![tf("xyz")], got);
}
@ -558,14 +517,14 @@ fn walk_dir_min_depth_3() {
#[test]
fn walk_dir_max_depth_1() {
let exp = td("foo", vec![tf("bar")]);
let (_tmp, got) = dir_setup_with(&exp, |wd| wd.max_depth(0));
let (_tmp, got) = dir_setup_with(&exp, |wd| wd.max_depth(1));
assert_tree_eq!(td("foo", vec![]), got);
}
#[test]
fn walk_dir_max_depth_2() {
let exp = td("foo", vec![tf("bar"), tf("baz")]);
let (_tmp, got) = dir_setup_with(&exp, |wd| wd.max_depth(0));
let (_tmp, got) = dir_setup_with(&exp, |wd| wd.max_depth(1));
assert_tree_eq!(td("foo", vec![]), got);
}
@ -581,7 +540,7 @@ fn walk_dir_max_depth_3() {
td("abc", vec![]),
tf("baz"),
]);
let (_tmp, got) = dir_setup_with(&exp, |wd| wd.max_depth(1));
let (_tmp, got) = dir_setup_with(&exp, |wd| wd.max_depth(2));
assert_tree_eq!(exp_trimmed, got);
}
@ -595,7 +554,7 @@ fn walk_dir_min_max_depth() {
let tmp = tmpdir();
exp.create_in(tmp.path()).unwrap();
let got = Tree::from_walk_with(tmp.path(),
|wd| wd.min_depth(1).max_depth(1))
|wd| wd.min_depth(2).max_depth(2))
.unwrap().unwrap_dir();
assert_tree_eq!(
td("foo", vec![tf("bar"), td("abc", vec![]), tf("baz")]),
@ -612,13 +571,13 @@ fn walk_dir_skip() {
let tmp = tmpdir();
exp.create_in(tmp.path()).unwrap();
let mut got = vec![];
let mut it = WalkDir::new(tmp.path()).into_iter();
let mut it = WalkDir::new(tmp.path()).min_depth(1).into_iter();
loop {
let dent = match it.next().map(|x| x.unwrap()) {
None => break,
Some(dent) => dent,
};
let name = dent.file_name().into_string().unwrap();
let name = dent.file_name().to_str().unwrap().to_owned();
if name == "abc" {
it.skip_current_dir();
}
@ -628,6 +587,30 @@ fn walk_dir_skip() {
assert_eq!(got, vec!["abc", "bar", "baz", "foo"]); // missing xyz!
}
#[test]
fn walk_dir_filter() {
let exp = td("foo", vec![
tf("bar"),
td("abc", vec![tf("fit")]),
tf("faz"),
]);
let tmp = tmpdir();
let tmp_path = tmp.path().to_path_buf();
exp.create_in(tmp.path()).unwrap();
let it = WalkDir::new(tmp.path()).min_depth(1)
.into_iter()
.filter_entry(move |d| {
let n = d.file_name().to_string_lossy().into_owned();
!d.file_type().is_dir()
|| n.starts_with("f")
|| d.path() == &*tmp_path
});
let mut got = it.map(|d| d.unwrap().file_name().to_str().unwrap().into())
.collect::<Vec<String>>();
got.sort();
assert_eq!(got, vec!["bar", "faz", "foo"]);
}
#[test]
fn qc_roundtrip() {
fn p(exp: Tree) -> bool {