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A Streamlit/Gradio equivalent for pure Rust. Build live browser UIs in seconds with no HTML, CSS, or JS required.

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# RustView

A Streamlit/Gradio equivalent for pure Rust. Write a plain Rust function, and
RustView turns it into a live browser UI -- no HTML, no JavaScript, no frontend
build step.

**The project is under active development.** The core widget set and layout system
are usable today, but the API is not yet stable. Expect breaking changes before
a 1.0 release.

## Why RustView?

If you've used Streamlit or Gradio in Python, you know how fast you can go from
an idea to a working UI. RustView brings that same experience to Rust. No HTML,
no CSS, no JavaScript, no npm, no build step. Just a function.

This makes it a good fit when you already have Rust code and want to put a UI
on it without switching languages or maintaining a separate frontend. Internal
tools, ML model demos, data explorers, system dashboards: anything where you
want a real browser UI without the overhead of a full web stack.

![examples/showcase.rs cargo run --example showcase](https://cdn.goygoyengine.com/images/1774340095471-adb1429bc819b740.gif)

## Quick Start

Add the dependency to your `Cargo.toml`:

```toml
[dependencies]
rustview = "0.1.5"
```

Or use `cargo add`:

```bash
cargo add rustview
```

Write your app:

```rust
use rustview::prelude::*;

fn app(ui: &mut Ui) {
    let name = ui.text_input("Your name", "World");
    let times = ui.int_slider("Repeat", 1..=10, 3);
    for _ in 0..times {
        ui.write(format!("Hello, {}!", name));
    }
}

fn main() {
    rustview::run(app);
}
```

Run it:

```bash
cargo run
# opens http://127.0.0.1:8501
```

## Features

RustView ships 50+ widgets across these categories:

| Category | Widgets |
|----------|---------|
| Input | `text_input`, `int_slider`, `slider`, `checkbox`, `button`, `toggle`, `radio`, `select`, `selectbox`, `multi_select`, `text_area`, `number_input`, `int_input`, `color_picker`, `date_picker`, `file_upload`, `image_upload` |
| Output | `write`, `heading`, `subheading`, `caption`, `markdown`, `code`, `json`, `table`, `dataframe`, `metric`, `progress`, `spinner`, `divider`, `badge`, `link` |
| Alerts | `success`, `warning`, `info`, `error`, `toast` |
| Media | `image`, `audio`, `video`, `download_button` |
| Layout | `container`, `sidebar`, `columns`, `tabs`, `expander`, `row`, `modal`, `empty` |
| Forms | `form`, `form_submit_button` |
| Charts | `line_chart`, `bar_chart`, `scatter_chart`, `histogram` |
| Theming | `Theme` struct with CSS custom properties |

Full API docs: [docs/widgets.md](docs/widgets.md)

## Examples

Four runnable examples are included:

```bash
cargo run --example hello       # minimal text-in / text-out
cargo run --example counter     # stateful counter with buttons
cargo run --example dashboard   # multi-column layout with charts
cargo run --example showcase    # every widget on a single page
```

## Built with RustView

Here are some projects powered by RustView:

- [OldTurkicOCR](https://github.com/EdgeTypE/OldTurkicOCR) - An Optical Character Recognition tool for Old Turkic (Orkhon) script.

## Configuration

```rust
use rustview::server::RustViewConfig;

let config = RustViewConfig {
    bind: "0.0.0.0:8080".parse().unwrap(),
    title: "My Dashboard".into(),
    session_ttl_secs: 3600,
    max_upload_bytes: 10_000_000,
    ..Default::default()
};
rustview::run_with_config(app, config);
```

Themes are customizable through a `Theme` struct:

```rust
use rustview::server::{RustViewConfig, Theme};

let config = RustViewConfig {
    theme: Theme {
        background: "#ffffff".into(),
        foreground: "#1a1a1a".into(),
        primary: "#0066ff".into(),
        ..Theme::default()
    },
    ..Default::default()
};
```

## State Management

Every widget remembers its value across re-renders automatically. For
user-defined state, use `get_state` and `set_state`:

```rust
fn counter(ui: &mut Ui) {
    let count = ui.get_state::<i64>("n", 0);
    if ui.button("Increment") {
        ui.set_state("n", count + 1);
    }
    ui.write(format!("Count: {}", ui.get_state::<i64>("n", 0)));
}
```

## Interface Mode

For simple input-to-output functions, the Gradio-style `Interface` API avoids
writing any UI code:

```rust
use rustview::prelude::*;

fn greet(name: String) -> String {
    format!("Hello, {}!", name)
}

fn main() {
    Interface::from_fn(greet)
        .title("Greeter")
        .description("Type a name to greet")
        .launch();
}
```

## Architecture

RustView uses a thin-client / server-rendered model:

- An Axum HTTP server runs the app function and maintains a virtual DOM per session.
- On each user interaction the server diffs the old and new trees and sends
  JSON patches over SSE or as a POST response.
- A lightweight (~12 KB) vanilla JS shim in the browser applies patches and forwards
  events back to the server.
- Session state is stored in-memory with a configurable TTL (default 24 hours).
- The `#[cached]` proc-macro can cache expensive computations across renders.

See [docs/architecture.md](docs/architecture.md) for a detailed walkthrough.

## Testing

The `TestUi` harness lets you unit-test apps without starting a server:

```rust
use rustview::testing::TestUi;

#[test]
fn test_counter() {
    let mut t = TestUi::new();
    t.run(|ui| {
        let n = ui.get_state::<i64>("n", 0);
        if ui.button("Inc") { ui.set_state("n", n + 1); }
        ui.write(format!("Count: {}", ui.get_state::<i64>("n", 0)));
    });
    assert!(t.contains_text("Count: 0"));
    t.click_button("Inc");
    t.run(|ui| {
        let n = ui.get_state::<i64>("n", 0);
        if ui.button("Inc") { ui.set_state("n", n + 1); }
        ui.write(format!("Count: {}", ui.get_state::<i64>("n", 0)));
    });
    assert!(t.contains_text("Count: 1"));
}
```

## Roadmap

The list below reflects what exists today and what is planned. Items may shift
depending on community feedback.

**Done**

- Publish to crates.io
- Core widget set (50+ widgets across input, output, layout, charts)
- Immediate-mode rendering with virtual DOM diffing
- Session state and user-defined state
- SSE-based live updates
- `#[cached]` proc-macro
- Custom theming
- Interface mode (Gradio-style single-function UIs)
- TestUi harness for unit testing

**Near-term**

- Add accessibility attributes (ARIA roles, keyboard navigation)
- WebSocket transport option alongside SSE
- File download improvements (streaming large files)
- Stabilize the public API

**Medium-term**

- Component system for reusable widget groups
- Persistent state backends (SQLite, Redis)
- Authentication and multi-user session isolation
- Client-side routing for multi-page apps
- More chart types (area, candlestick, heatmap)

**Long-term**

- Plugin API for third-party widgets
- Deployment helpers (Docker image, systemd unit)
- Optional WASM compilation for offline-capable apps

## Requirements

- Rust 1.75 or newer
- Edition 2021

## Contributing

See [CONTRIBUTING.md](CONTRIBUTING.md) for setup instructions, coding
guidelines, and how to submit a pull request.

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