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runal

★ 105 Open GitHub ↗

a creative coding environment for the terminal :fireworks:

// repository documentation

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# Runal

![GitHub release (latest SemVer)](https://img.shields.io/github/v/release/emprcl/runal) ![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/emprcl/runal/build.yml)

:notebook: **[User Manual](https://empr.cl/runal/)**

Runal is a text-based creative coding environment for the terminal. It works similarly as [processing](https://processing.org/) or [p5js](https://p5js.org/) but it does all the rendering as text. It can either be programmed with [JavaScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript), or used as a [Go](https://go.dev/) package.

**_Runal is a work-in-progress. The API should not be considered as stable until it reaches 1.0._**

_Feel free to [open an issue](https://github.com/emprcl/runal/issues/new)._

![runal screenshot](https://raw.githubusercontent.com/emprcl/runal/main/docs/screenshot.png)

## Installation

### Supported platforms

Prebuilt binaries are available for the following platforms:

| OS      | Architectures                              |
| ------- | ------------------------------------------ |
| Linux   | x86-64 (amd64), arm64, armv7, armv6        |
| macOS   | Intel (amd64), Apple Silicon (arm64)       |
| Windows | x86-64 (amd64)                             |

> _The Linux arm builds cover the Raspberry Pi: use **arm64** for the 64-bit Raspberry Pi OS, and **armv7** / **armv6** for the 32-bit Raspberry Pi OS (armv6 targets the Pi 1 / Zero)._

### Quick-install

On **linux** or **macOS**, you can run this quick-install bash script:
```sh
curl -sSL empr.cl/get/runal | bash
```

### Packages

#### Homebrew (macOS & Linux)

```sh
brew tap emprcl/tap
brew trust emprcl/tap
brew install runal
```

#### Scoop (Windows)

```powershell
scoop bucket add emprcl https://github.com/emprcl/scoop-bucket
scoop install runal
```

#### AUR

https://aur.archlinux.org/packages/runal

### Manual installation

#### Linux & macOS

[Download the last release](https://github.com/emprcl/runal/releases) for your platform.

Then:
```sh
# Extract files
mkdir -p runal && tar -zxvf runal_VERSION_PLATFORM.tar.gz -C runal
cd runal

# Run runal
./runal

# Run runal demo
./runal -demo
```

#### Windows

> _We recommend using Windows Terminal with a good monospace font like Iosevka to display Runal correctly on Windows._

Unzip the last [windows release](https://github.com/emprcl/runal/releases) and, in the same directory, run:
```winbatch
; Run runal
.\runal.exe

; Run runal demo
.\runal.exe -demo
```

### Build it yourself

You'll need [go 1.26](https://go.dev/dl/) minimum.
Although you should be able to build it for either **linux**, **macOS** or **Windows**, it has only been tested on **linux**.

```sh
# Linux
make GOLANG_OS=linux build

# macOS
make GOLANG_OS=darwin build

# Windows
make GOLANG_OS=windows build

# Raspberry Pi OS
make GOLANG_OS=linux GOLANG_ARCH=arm64 build
```

## Usage

### JavaScript runtime

You can use JavaScript for scripting your sketch. Your js file should contain a `setup` and a `draw` method. Both methods take a single argument (here `c`) representing a canvas object that holds all the available primitives:
```js
// sketch.js

function setup(c) {}

function draw(c) {}
```

You can add extra methods `onKey`, `onMouseMove`, `onMouseClick`, `onMouseRelease` and `onMouseWheel` to catch keyboard and mouse events:
```js
function onKey(c, e) {}
function onMouseMove(c, e) {}
function onMouseClick(c, e) {}
function onMouseRelease(c, e) {}
function onMouseWheel(c, e) {}
````

And you can then execute the file with:
```sh
./runal -f sketch.js
```

The js file will be automatically reloaded when modified, no need to restart the command.

#### Standalone executable

You can create a standalone executable from the JavaScript file specified with **-f** using **-o [FILE]**:
```sh
./runal -f sketch.js -o sketch

# Run the standalone executable
./sketch
```

### Go package

Because Runal is written in Go, you can also use it as a Go package.

```go
// sketch.go
package main

import (
	"context"
	"os"
	"os/signal"

"github.com/emprcl/runal"
)

func main() {
	runal.Run(context.Background(),	setup, draw, runal.WithOnKey(onKey), runal.WithOnMouseClick(onMouseClick))
}

func setup(c *runal.Canvas) {}

func draw(c *runal.Canvas) {}

func onKey(c *runal.Canvas, e runal.KeyEvent) {}
func onMouseClick(c *runal.Canvas, e runal.MouseEvent) {}
```

Then, simply build it:
```
go run sketch.go
```

## Documentation

Check the [API reference](https://empr.cl/runal/#reference).
You can also check some examples in the [examples directory](https://github.com/emprcl/runal/tree/main/examples).

## Contributing

Contributions are very welcome, even if you're a beginner! Whether it's code, documentation, bug reports, examples, or just ideas, you're encouraged to join in.

Just be kind, inclusive, and patient. We're all here to learn and build something cool together.

How to contribute:
  1) Start with a [discussion](https://github.com/emprcl/runal/discussions) or [open an issue](https://github.com/emprcl/runal/issues) to report a bug or suggest an enhancement. **Please check if one already exists on the same topic first.**
  2) Open a [Pull Request](https://github.com/emprcl/runal/pulls). Please keep it small and focused.

You can also contribute by sharing what you've made with Runal on GitHub, social media, or anywhere else. We'd love to see it!

## Acknowledgments

Runal uses a few awesome packages:
 - [dop251/goja](https://github.com/dop251/goja) for the JavaScript engine
 - [fsnotify/fsnotify](https://github.com/fsnotify/fsnotify) for watching file changes in realtime
 - [charmbracelet/lipgloss](https://github.com/charmbracelet/lipgloss) for handling colors

runal

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