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Merge pull request #181 from crypto-universe/master

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Add walkdir example
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Brian Anderson 2017-06-06 17:25:31 -07:00 committed by GitHub
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32
src/app.md
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@ -6,6 +6,7 @@
| [Unzip a tarball to a temporary directory][ex-tar-temp] | [![flate2-badge]][flate2] [![tar-badge]][tar] [![tempdir-badge]][tempdir] | [![cat-filesystem-badge]][cat-filesystem] [![cat-compression-badge]][cat-compression] |
| [Recursively find duplicate file names][ex-dedup-filenames] | [![walkdir-badge]][walkdir] | [![cat-filesystem-badge]][cat-filesystem] |
| [Recursively find all files with given predicate][ex-file-predicate] | [![walkdir-badge]][walkdir] | [![cat-filesystem-badge]][cat-filesystem] |
| [Recursively calculate file sizes at given depth][ex-file-sizes] | [![walkdir-badge]][walkdir] | [![cat-filesystem-badge]][cat-filesystem] |
[ex-clap-basic]: #ex-clap-basic
<a name="ex-clap-basic"></a>
@ -234,6 +235,35 @@ fn run() -> Result<()> {
# quick_main!(run);
```
[ex-file-sizes]: #ex-file-sizes
<a name="ex-file-sizes"></a>
## Recursively calculate file sizes at given depth
Recursion depth can be flexibly set by [`WalkDir::min_depth`] & [`WalkDir::max_depth`] methods.
In this example we sum all file sizes to 3 subfolders depth, ignoring files in the root folder
at the same time.
[![walkdir-badge]][walkdir] [![cat-filesystem-badge]][cat-filesystem]
```rust
extern crate walkdir;
use walkdir::WalkDir;
fn main() {
let total_size = WalkDir::new(".")
.min_depth(1)
.max_depth(3)
.into_iter()
.filter_map(|entry| entry.ok()) // Files, we have access to
.filter_map(|entry| entry.metadata().ok()) // Get metadata
.filter(|metadata| metadata.is_file()) // Filter out directories
.fold(0, |acc, m| acc + m.len()); // Accumulate sizes
println!("Total size: {} bytes.", total_size);
}
```
<!-- Categories -->
[cat-command-line-badge]: https://badge-cache.kominick.com/badge/command_line--x.svg?style=social
@ -261,3 +291,5 @@ fn run() -> Result<()> {
[`flate2::read::GzDecoder::new`]: https://docs.rs/flate2/0.2.19/flate2/read/struct.GzDecoder.html#method.new
[`tar::Archive::unpack`]: https://docs.rs/tar/0.4.12/tar/struct.Archive.html#method.new
[`tempdir::TempDir::new`]: https://docs.rs/tempdir/0.3.5/tempdir/struct.TempDir.html#method.new
[`WalkDir::min_depth`]: https://docs.rs/walkdir/*/walkdir/struct.WalkDir.html#method.min_depth
[`WalkDir::max_depth`]: https://docs.rs/walkdir/*/walkdir/struct.WalkDir.html#method.max_depth

2
src/intro.md
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@ -77,6 +77,7 @@ community. It needs and welcomes help. For details see
| [Unzip a tarball to a temporary directory][ex-tar-temp] | [![flate2-badge]][flate2] [![tar-badge]][tar] [![tempdir-badge]][tempdir] | [![cat-filesystem-badge]][cat-filesystem] [![cat-compression-badge]][cat-compression] |
| [Recursively find duplicate file names][ex-dedup-filenames] | [![walkdir-badge]][walkdir] | [![cat-filesystem-badge]][cat-filesystem] |
| [Recursively find all files with given predicate][ex-file-predicate] | [![walkdir-badge]][walkdir] | [![cat-filesystem-badge]][cat-filesystem] |
| [Recursively calculate file sizes at given depth][ex-file-sizes] | [![walkdir-badge]][walkdir] | [![cat-filesystem-badge]][cat-filesystem] |
## [Logging](logging.html)
@ -203,6 +204,7 @@ Keep lines sorted.
[ex-dedup-filenames]: app.html#ex-dedup-filenames
[ex-file-post]: net.html#ex-file-post
[ex-file-predicate]: app.html#ex-file-predicate
[ex-file-sizes]: app.html#ex-file-sizes
[ex-global-mut-state]: basics.html#ex-global-mut-state
[ex-hex-encode-decode]: encoding.html#ex-hex-encode-decode
[ex-json-value]: encoding.html#ex-json-value