[](https://crates.io/crates/directories)
[](https://docs.rs/directories/)
[](https://travis-ci.org/soc/directories-rs)
[](https://ci.appveyor.com/project/soc/directories-rs/branch/master)
# `directories`
## Introduction
- a tiny mid-level library with a minimal API
- that provides the platform-specific, user-accessible locations
- for retrieving and storing configuration, cache and other data
- on Linux, Redox, Windows (≥ Vista), macOS and other platforms.
The library provides the location of these directories by leveraging the mechanisms defined by
- the [XDG base directory](https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html) and
the [XDG user directory](https://www.freedesktop.org/wiki/Software/xdg-user-dirs/) specifications on Linux
- the [Known Folder](https://msdn.microsoft.com/en-us/library/windows/desktop/dd378457.aspx) API on Windows
- the [Standard Directories](https://developer.apple.com/library/content/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/FileSystemOverview/FileSystemOverview.html#//apple_ref/doc/uid/TP40010672-CH2-SW6)
guidelines on macOS
## Platforms
This library is written in Rust, and supports Linux, Redox, macOS and Windows.
Other platforms are also supported; they use the Linux conventions.
_dirs_, the low-level sister library, is available at [dirs-rs](https://github.com/soc/dirs-rs).
A version of this library running on the JVM is provided by [directories-jvm](https://github.com/soc/directories-jvm).
## Usage
#### Dependency
Add the library as a dependency to your project by inserting
```toml
directories = "1.0"
```
into the `[dependencies]` section of your Cargo.toml file.
#### Example
Library run by user Alice:
```rust
extern crate directories;
use directories::{BaseDirs, UserDirs, ProjectDirs};
if let Some(proj_dirs) = ProjectDirs::from("com", "Foo Corp", "Bar App") {
proj_dirs.config_dir();
// Lin: /home/alice/.config/barapp
// Win: C:\Users\Alice\AppData\Roaming\Foo Corp\Bar App\config
// Mac: /Users/Alice/Library/Preferences/com.Foo-Corp.Bar-App
}
if let Some(base_dirs) = BaseDirs::new() {
base_dirs.executable_dir();
// Lin: Some(/home/alice/.local/bin)
// Win: None
// Mac: None
}
if let Some(user_dirs) = UserDirs::new() {
user_dirs.audio_dir();
// Lin: /home/alice/Music
// Win: C:\Users\Alice\Music
// Mac: /Users/Alice/Music
}
```
## Design Goals
- The _directories_ library is designed to provide an accurate snapshot of the system's state at
the point of invocation of `BaseDirs::new`, `UserDirs::new` or `ProjectDirs::from`. Subsequent
changes to the state of the system are not reflected in values created prior to such a change.
- This library does not create directories or check for their existence. The library only provides
information on what the path to a certain directory _should_ be. How this information is used is
a decision that developers need to make based on the requirements of each individual application.
- This library is intentionally focused on providing information on user-writable directories only.
There is no discernible benefit in returning a path that points to a user-level, writable
directory on one operating system, but a system-level, read-only directory on another, that would
outweigh the confusion and unexpected failures such an approach would cause.
- `executable_dir` is specified to provide the path to a user-writable directory for binaries.<br/>
As such a directory only commonly exists on Linux, it returns `None` on macOS and Windows.
- `font_dir` is specified to provide the path to a user-writable directory for fonts.<br/>
As such a directory only exists on Linux and macOS, it returns `None` on Windows.
- `runtime_dir` is specified to provide the path to a directory for non-essential runtime data.
It is required that this directory is created when the user logs in, is only accessible by the
user itself, is deleted when the user logs out, and supports all filesystem features of the
operating system.<br/>
As such a directory only commonly exists on Linux, it returns `None` on macOS and Windows.
## Features
### `BaseDirs`
The intended use case for `BaseDirs` is to query the paths of user-invisible standard directories
that have been defined according to the conventions of the operating system the library is running on.
If you want to compute the location of cache, config or data directories for your own application or project, use `ProjectDirs` instead.
| `home_dir` | `$HOME` | `{FOLDERID_Profile}` | `$HOME` |
| `cache_dir` | `$XDG_CACHE_HOME` or `$HOME`/.cache | `{FOLDERID_LocalAppData}` | `$HOME`/Library/Caches |
| `config_dir` | `$XDG_CONFIG_HOME` or `$HOME`/.config | `{FOLDERID_RoamingAppData}` | `$HOME`/Library/Preferences |
| `data_dir` | `$XDG_DATA_HOME` or `$HOME`/.local/share | `{FOLDERID_RoamingAppData}` | `$HOME`/Library/Application Support |
| `data_local_dir` | `$XDG_DATA_HOME` or `$HOME`/.local/share | `{FOLDERID_LocalAppData}` | `$HOME`/Library/Application Support |
| `executable_dir` | `Some($XDG_BIN_HOME`/../bin`)` or `Some($XDG_DATA_HOME`/../bin`)` or `Some($HOME`/.local/bin`)` | `None` | `None` |
| `runtime_dir` | `Some($XDG_RUNTIME_DIR)` or `None` | `None` | `None` |
### `UserDirs`
The intended use case for `UserDirs` is to query the paths of user-facing standard directories
that have been defined according to the conventions of the operating system the library is running on.
| `home_dir` | `$HOME` | `{FOLDERID_Profile}` | `$HOME` |
| `audio_dir` | `Some(XDG_MUSIC_DIR)` or `None` | `Some({FOLDERID_Music})` | `Some($HOME`/Music/`)` |
| `desktop_dir` | `Some(XDG_DESKTOP_DIR)` or `None` | `Some({FOLDERID_Desktop})` | `Some($HOME`/Desktop/`)` |
| `document_dir` | `Some(XDG_DOCUMENTS_DIR)` or `None` | `Some({FOLDERID_Documents})` | `Some($HOME`/Documents/`)` |
| `download_dir` | `Some(XDG_DOWNLOAD_DIR)` or `None` | `Some({FOLDERID_Downloads})` | `Some($HOME`/Downloads/`)` |
| `font_dir` | `Some($XDG_DATA_HOME`/fonts/`)` or `Some($HOME`/.local/share/fonts/`)` | `None` | `Some($HOME`/Library/Fonts/`)` |
| `picture_dir` | `Some(XDG_PICTURES_DIR)` or `None` | `Some({FOLDERID_Pictures})` | `Some($HOME`/Pictures/`)` |
| `public_dir` | `Some(XDG_PUBLICSHARE_DIR)` or `None` | `Some({FOLDERID_Public})` | `Some($HOME`/Public/`)` |
| `template_dir` | `Some(XDG_TEMPLATES_DIR)` or `None` | `Some({FOLDERID_Templates})` | `None` |
| `video_dir` | `Some(XDG_VIDEOS_DIR)` or `None` | `Some({FOLDERID_Videos})` | `Some($HOME`/Movies/`)` |
### `ProjectDirs`
The intended use case for `ProjectDirs` is to compute the location of cache, config or data directories for your own application or project,
which are derived from the standard directories.
| `cache_dir` | `$XDG_CACHE_HOME`/`<project_path>` or `$HOME`/.cache/`<project_path>` | `{FOLDERID_LocalAppData}`/`<project_path>`/cache | `$HOME`/Library/Caches/`<project_path>` |
| `config_dir` | `$XDG_CONFIG_HOME`/`<project_path>` or `$HOME`/.config/`<project_path>` | `{FOLDERID_RoamingAppData}`/`<project_path>`/config | `$HOME`/Library/Preferences/`<project_path>` |
| `data_dir` | `$XDG_DATA_HOME`/`<project_path>` or `$HOME`/.local/share/`<project_path>` | `{FOLDERID_RoamingAppData}`/`<project_path>`/data | `$HOME`/Library/Application Support/`<project_path>` |
| `data_local_dir` | `$XDG_DATA_HOME`/`<project_path>` or `$HOME`/.local/share/`<project_path>` | `{FOLDERID_LocalAppData}`/`<project_path>`/data | `$HOME`/Library/Application Support/`<project_path>` |
| `runtime_dir` | `Some($XDG_RUNTIME_DIR`/`_project_path_)` | `None` | `None` |
The specific value of `<project_path>` is computed by the
ProjectDirs::from(qualifier: &str,
organization: &str,
application: &str)
function and varies across operating systems. As an example, calling
ProjectDirs::from("org" /*qualifier*/,
"Baz Corp" /*organization*/,
"Foo Bar-App" /*application*/)
results in the following values:
| `"foobar-app"` | `"Baz Corp/Foo Bar-App"` | `"org.Baz-Corp.Foo-Bar-App"` |
The `ProjectDirs::from_path` function allows the creation of `ProjectDirs` structs directly from a `PathBuf` value.
This argument is used verbatim and is not adapted to operating system standards.
The use of `ProjectDirs::from_path` is strongly discouraged, as its results will not follow operating system standards on at least two of three platforms.
## Comparison
There are other crates in the Rust ecosystem that try similar or related things.
Here is an overview of them, combined with ratings on properties that guided the design of this crate.
Please take this table with a grain of salt: a different crate might very well be more suitable for your specific use case.
(Of course _my_ crate achieves _my_ design goals better than other crates, which might have had different design goals.)
| [app_dirs](https://crates.io/crates/app_dirs) | Unmaintained | ✔ | ✔ | ✔ | 🞈 | ✖ | ✔ | ✖ |
| [app_dirs2](https://crates.io/crates/app_dirs2) | Maintained | ✔ | ✔ | ✔ | 🞈 | ✖ | ✔ | ✖ |
| [dirs](https://crates.io/crates/dirs) | Developed | ✔ | ✔ | ✔ | ✔ | ✔ | ✖ | ✔ |
| **directories** | **Developed** | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
| [s_app_dir](https://crates.io/crates/s_app_dir) | Unmaintained? | ✔ | ✖ | 🞈 | ✖ | ✖ | 🞈 | ✖ |
| [standard_paths](https://crates.io/crates/standard_paths) | Maintained | ✔ | ✖ | ✔ | ✔ | ✔ | ✔ | ✖ |
| [xdg](https://crates.io/crates/xdg) | Maintained | ✔ | ✖ | ✖ | ✔ | ✖ | ✔ | 🞈 |
| [xdg-basedir](https://crates.io/crates/xdg-basedir) | Unmaintained? | ✔ | ✖ | ✖ | ✔ | ✖ | ✖ | 🞈 |
| [xdg-rs](https://crates.io/crates/xdg-rs) | Obsolete | ✔ | ✖ | ✖ | ✔ | ✖ | ✖ | 🞈 |
- Lin: Linux support
- Mac: macOS support
- Win: Windows support
- Base: Supports [generic base directories](#basedirs)
- User: Supports [user directories](#userdirs)
- Proj: Supports [project-specific base directories](#projectdirs)
- Conv: Follows naming conventions of the operating system it runs on
## Build
It's possible to cross-compile this library if the necessary toolchains are installed with rustup.
This is helpful to ensure a change has not broken compilation on a different platform.
The following commands will build this library on Linux, macOS and Windows:
```
cargo build --target=x86_64-unknown-linux-gnu
cargo build --target=x86_64-pc-windows-gnu
cargo build --target=x86_64-apple-darwin
cargo build --target=x86_64-unknown-redox
```
## Changelog
### 2
The behavior of deactivated, missing or invalid [_XDG User Dirs_](https://www.freedesktop.org/wiki/Software/xdg-user-dirs/)
entries on Linux has been improved (contributed by @tmiasko, thank you!):
- Version 1 returned the user's home directory (`Some($HOME)`) for such faulty entries, except for a faulty `XDG_DESKTOP_DIR` entry which returned (`Some($HOME/Desktop)`).
- Version 2 returns `None` for such entries.
## License
Licensed under either of
* Apache License, Version 2.0
([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license
([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
## Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.