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https://github.com/BurntSushi/walkdir

Rust library for walking directories recursively.
https://github.com/BurntSushi/walkdir

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Rust library for walking directories recursively.

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walkdir

=======

A cross platform Rust library for efficiently walking a directory recursively.

Comes with support for following symbolic links, controlling the number of

open file descriptors and efficient mechanisms for pruning the entries in the

directory tree.



[![Build status](https://github.com/BurntSushi/walkdir/workflows/ci/badge.svg)](https://github.com/BurntSushi/walkdir/actions)

[![](https://meritbadge.herokuapp.com/walkdir)](https://crates.io/crates/walkdir)



Dual-licensed under MIT or the [UNLICENSE](https://unlicense.org/).



### Documentation



[docs.rs/walkdir](https://docs.rs/walkdir/)



### Usage



To use this crate, add `walkdir` as a dependency to your project's

`Cargo.toml`:



```toml

[dependencies]

walkdir = "2"

```



### 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};



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());

}

```



### Minimum Rust version policy



This crate's minimum supported `rustc` version is `1.34.0`.



The current policy is that the minimum Rust version required to use this crate

can be increased in minor version updates. For example, if `crate 1.0` requires

Rust 1.20.0, then `crate 1.0.z` for all values of `z` will also require Rust

1.20.0 or newer. However, `crate 1.y` for `y > 0` may require a newer minimum

version of Rust.



In general, this crate will be conservative with respect to the minimum

supported version of Rust.



### 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`:



```sh

# 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 $DIR



# Test speed of `find` on warm cache:

time find $DIR



# 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.