io-vdir 0.0.1

Set of I/O-free coroutines to manage Vdir filesystems
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# I/O Vdir [![Documentation](https://img.shields.io/docsrs/io-vdir)](https://docs.rs/io-vdir/latest/io_vdir) [![Matrix](https://img.shields.io/matrix/pimalaya:matrix.org?color=success&label=chat)](https://matrix.to/#/#pimalaya:matrix.org)

Set of **I/O-free** Rust coroutines to manage [Vdir](https://vdirsyncer.pimutils.org/en/stable/vdir.html) filesystems, based on [io-fs](https://github.com/pimalaya/io-fs).

This library allows you to manage vCard files (.vcf) and iCal (.ics) files inside [Vdir](https://vdirsyncer.pimutils.org/en/stable/vdir.html) filesystems using an I/O-agnostic approach, based on 3 concepts:

### Coroutine

A coroutine is an *I/O-free*, *resumable* and *composable* state machine that **emits I/O requests**. A coroutine is considered *terminated* when it does not emit I/O requests anymore.

*See available coroutines at [./src/coroutines](https://github.com/pimalaya/io-vdir/tree/master/src/coroutines).*

### Runtime

A runtime contains all the I/O logic, and is responsible for **processing I/O requests** emitted by coroutines.

*See available runtimes at [io-fs](https://github.com/pimalaya/io-fs/tree/master/src/runtimes).*

### Loop

The loop is the glue between coroutines and runtimes. It makes the coroutine progress while allowing runtime to process I/O.

## Examples

### List collections synchronously

```rust,ignore
use std::{path::PathBuf};

use io_fs::runtimes::std::handle;
use io_vdir::coroutines::list_collections::{ListCollections, ListCollectionsResult};

let mut arg = None;
let mut coroutine = ListCollections::new("/path/to/collections");

let collections = loop {
    match coroutine.resume(arg) {
        ListCollectionsResult::Ok(collections) => break collections,
        ListCollectionsResult::Err(err) => panic!("{err}"),
        ListCollectionsResult::Io(io) => arg = Some(handle(io).unwrap()),
    }
};

println!("Collection paths:");

for collection in collections {
    println!(" - {}", collection.path.display());
}
```

*See complete examples at [./examples](https://github.com/pimalaya/io-vdir/blob/master/examples).*

## More examples

Have a look at projects built on the top of this library:

- [io-addressbook](https://github.com/pimalaya/io-addressbook): Set of I/O-free Rust coroutines and clients to manage contacts.
- [Cardamum](https://github.com/pimalaya/cardamum): CLI to manage contacts.

## License

This project is licensed under either of:

- [MIT license](LICENSE-MIT)
- [Apache License, Version 2.0](LICENSE-APACHE)

at your option.

## Sponsoring

[![nlnet](https://nlnet.nl/logo/banner-160x60.png)](https://nlnet.nl/)

Special thanks to the [NLnet foundation](https://nlnet.nl/) and the [European Commission](https://www.ngi.eu/) that helped the project to receive financial support from various programs:

- [NGI Assure](https://nlnet.nl/project/Himalaya/) in 2022
- [NGI Zero Entrust](https://nlnet.nl/project/Pimalaya/) in 2023
- [NGI Zero Core](https://nlnet.nl/project/Pimalaya-PIM/) in 2024 *(still ongoing)*

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