rs-fsrs

A rust implementation of FSRS scheduler.

Install:

[dependencies]
rs-fsrs = { version = "1.2.1" }

Quickstart:

use chrono::Utc;
use rs_fsrs::{FSRS, Card, Rating};

fn main() {
    let fsrs = FSRS::default();
    let card = Card::new();

    let record_log = fsrs.repeat(card, Utc::now());
    for rating in Rating::iter() {
        let item = record_log[rating].to_owned();
        println!("{:?}", item.card);
        println!("{:?}", item.review_log);
    }
}

Fractional Days

The library provides support for working with fractional days through the FractionalDays trait:

use chrono::Duration;
use rs_fsrs::FractionalDays;

fn main() {
    // Convert Duration to fractional days
    let duration = Duration::hours(36); // 1.5 days
    let days = duration.num_fractional_days(); // 1.5
    
    // Create Duration from fractional days
    let duration = Duration::fractional_days(2.5); // 2.5 days
}

This is useful when you need more precision than whole days, as chrono's num_days() method truncates fractional parts.

Development

run

cargo fmt
cargo clippy -- -D clippy::nursery
cargo test --release

Other implementation

fsrs-rs contains a Rust API for training FSRS parameters, and for using them to schedule cards.

Bindings

• c/cpp
• python
• java
• nodejs

LICENSE

MIT