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<br><b>path-lib</b>
<br><sub><sup>CROSS-PLATFORM PATHS FOR RUST</sup></sub>
</h1>
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<p align="center">
<b>Application and OS Directories, Resolved Correctly</b>
<br>
<i>User and global scopes, hardened sub-paths, and guarded file operations. Zero dependencies.</i>
</p>
<p>
<strong>path-lib</strong> answers the question every application asks on startup: where do my data, config, cache, and logs go? The answer is different on Linux, macOS, and Windows, different again for a per-user tool and a machine-wide service, and quietly wrong the moment a Documents folder is redirected to OneDrive or a service starts without <code>HOME</code>. <strong>path-lib</strong> resolves all of it once per process and hands back clean, absolute paths.
</p>
<p>
Building on top of those directories is where most path bugs live. Every <code>*_at</code> accessor takes a relative path in either slash style and <b>rejects</b> anything that could escape the base directory or mean different things on different systems: <code>..</code>, drive letters, control characters, Windows-reserved characters and their Unicode look-alikes, bidirectional overrides, and device names such as <code>CON</code>. For names typed by end users, <code>sanitize</code> repairs instead of rejecting.
</p>
<p>
The file operations are deliberately conservative: nothing is ever overwritten, symbolic links are never followed while walking a tree, copies appear whole or not at all, and removing a filesystem root, the home directory, or a standard user folder is refused outright.
</p>
## Features
### Application Directories
- **Eight kinds** — data, config, cache, logs, state, runtime, temp, documents
- **Three scopes** — `App::new` (this user), `App::global` (the machine), `App::portable` (one folder you choose)
- **Native conventions** — XDG and FHS on Linux and BSD, the `Library` domains on macOS, Known Folders on Windows
- **Distinct by construction** — no two kinds share a directory, so clearing the cache can never wipe data
### Hardened Sub-Paths
- **Either slash style** — `"a/b"`, `"a\\b"`, `"/a//b/"` all mean the same thing and produce the platform separator
- **Reject, don't repair** — traversal, absolute paths, reserved names and characters fail before any path is built
- **`sanitize`** — lossy repair for user-supplied names; its output is always accepted
### OS Folders
- **`home`, `documents`, `desktop`, `downloads`, `pictures`, `music`, `videos`** — redirect-aware
- **`root`, `temp`, `exe`, `exe_dir`** — plus `os()`, a compile-time constant
- **Resolved once** — cached for the life of the process; later calls cost about a nanosecond
### Guarded File Operations
- **`make_dir`, `make_file`, `exists`, `list`, `remove`, `copy`, `move_to`, `find`**
- **Never overwrites**, **never follows links**, **refuses catastrophic deletes**
- **Atomic copies** — staged under a temporary name, renamed into place when complete
<hr>
## Installation
```toml
[dependencies]
path-lib = "0.1"
```
<hr>
## Quick Start
```rust
use path_lib::{App, Kind};
let app = App::new("HiveDB")?;
// Base directories, resolved once.
println!("{}", app.data()); // ~/Library/Application Support/HiveDB on macOS
// Hardened sub-paths: any slash style, always inside the base.
let db = app.data_at("/big\\sloppy//floppy/")?;
assert!(app.data_at("../../etc/passwd").is_err());
// Create on demand (0700 on Unix for user scope).
let wal = app.create(Kind::Data, "db/wal")?;
// Machine-wide, for services.
let svc = App::global("HiveDB")?;
println!("{}", svc.config()); // /etc/HiveDB on Linux
# Ok::<(), path_lib::Error>(())
```
### Where Things Go
| Kind | Linux (user) | macOS (user) | Windows (user) |
|-----------|-----------------------------|---------------------------------------|------------------------------|
| data | `~/.local/share/<app>` | `~/Library/Application Support/<app>` | `%LOCALAPPDATA%\<app>` |
| config | `~/.config/<app>` | `~/Library/Preferences/<app>` | `%APPDATA%\<app>` |
| cache | `~/.cache/<app>` | `~/Library/Caches/<app>` | `%LOCALAPPDATA%\<app>\cache` |
| logs | `~/.local/state/<app>/logs` | `~/Library/Logs/<app>` | `%LOCALAPPDATA%\<app>\logs` |
| Kind | Linux (global) | macOS (global) | Windows (global) |
|-----------|--------------------|---------------------------------------|------------------------------|
| data | `/var/lib/<app>` | `/Library/Application Support/<app>` | `%ProgramData%\<app>` |
| config | `/etc/<app>` | `/Library/Preferences/<app>` | `%ProgramData%\<app>\config` |
| cache | `/var/cache/<app>` | `/Library/Caches/<app>` | `%ProgramData%\<app>\cache` |
| logs | `/var/log/<app>` | `/Library/Logs/<app>` | `%ProgramData%\<app>\logs` |
The full tables, including state, runtime, temp, and documents, are in the [API reference](docs/API.md#directory-tables).
### User Input
```rust
let app = path_lib::App::new("HiveDB")?;
// Reject: for paths your code builds.
let p = app.documents_at("exports/2026")?;
// Repair: for names a user typed.
let name = path_lib::sanitize("Q3: final?.pdf"); // "Q3_ final_.pdf"
let p = app.documents_at(&name)?;
# Ok::<(), path_lib::Error>(())
```
<hr>
## Documentation
- [API reference](docs/API.md) — every public item, the directory tables, and the validation rules.
- [Performance](docs/PERFORMANCE.md) — benchmark methodology and results.
- [Developer guidelines](docs/GUIDELINES.md) — the engineering bar this project is built to.
- [Release notes](docs/release/) — what shipped, when, and why.
<br>
## Contributing
Contributions are welcome under the project's dual license. Before opening a pull request, please make sure:
1. `cargo fmt --all -- --check` passes.
2. `cargo clippy --all-targets --all-features -- -D warnings` is clean.
3. `cargo test --all-features` passes.
4. New public items include documentation and at least one example.
5. The [API reference](docs/API.md) and [CHANGELOG](CHANGELOG.md) are updated alongside code changes.
<br>
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<h2>License</h2>
<p><b>path-lib</b> is <b>dual-licensed</b> under either of:</p>
<ul>
<li><b>Apache License, Version 2.0</b> — see <a href="./LICENSE-APACHE" title="Apache-2.0 License">LICENSE-APACHE</a> or <a href="http://www.apache.org/licenses/LICENSE-2.0" title="Apache-2.0 License" target="_blank">apache.org/licenses/LICENSE-2.0</a></li>
<li><b>MIT License</b> — see <a href="./LICENSE-MIT" title="MIT License">LICENSE-MIT</a> or <a href="https://opensource.org/licenses/MIT" title="MIT License" target="_blank">opensource.org/licenses/MIT</a></li>
</ul>
<p>at your option.</p>
<br>
<h3>Contribution</h3>
<p>Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in <b>path-lib</b> by you, as defined in the <b>Apache-2.0 license</b>, shall be <b>dual-licensed</b> as above, without any additional terms or conditions.</p>
<p>Unless required by applicable law or agreed to in writing, software distributed under the Licenses is distributed on an <b>"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND</b>, either express or implied.</p>
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<sup>COPYRIGHT <small>©</small> 2026 <strong>JAMES GOBER.</strong></sup>
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