SwiftTUI

NOTICE: This library is under active development and is not ready for use in production or any other environment. Use at your own risk.

Current version: 0.0.1-dev (unstable, experimental)

SwiftUI-like library for building CLI applications.

Features

• 🚀 Compile-time safety
• 💪 Type-safe ASCII and ANSI libraries under the hood
• 🧰 Convenient output styling
• ✨ Pure Swift implementation

Installation

Swift Package Manager

Add the following to your Package.swift file:

let package = Package(
    // name, platforms, products, etc.
    dependencies: [
        // other dependencies
        .package(url: "https://github.com/besya/swift-tui.git", from: "0.0.1-dev"),
    ],
    targets: [
        .target(name: "<library>", dependencies: [
            // other dependencies
            .product(name: "SwiftTUI", package: "SwiftTUI"),
        ]),
        // other targets
    ]
)

Usage

Import

import SwiftTUI

Text

@main
struct Cli {
    static func main() async {
        let greeting = Text("Hello world!")
        print(greeting.render())
    }
}

> swift run
Building for debugging...
[7/7] Applying example
Build of product 'example' complete! (1.31s)
Hello world!

Styling

let greeting = Text("Hello world!")
    .style(.bold, .italic, .color(.brightMagenta))

print(greeting.render())

import SwiftTUI
import ANSI

@main
struct Cli {
    static func main() async {
        let primaryColor: Color = .rgb(255, 135, 215)
        let backgroundColor: Color = .black
        
        let expressivePinky: [Text.TextStyle] = [
            .color(primaryColor),
            .background(backgroundColor),
            .bold,
            .italic
        ]
        
        let greeting = Text("Hello world!").style(expressivePinky).style(.invert)
        print(greeting.render())
    }
}

Views

import SwiftTUI
import ANSI

struct Fruit {
    let name: String
    let color: Color
}

struct FruitItem: View {
    let name: String
    let color: Color
    
    var body: some View {
        Text(name).style(.color(color))
    }
}

struct FruitList: View {
    let fruits: [Fruit]

    var body: some View {
        VStack {
            for fruit in fruits {
                FruitItem(name: fruit.name, color: fruit.color)
            }
        }
    }
}

@main
struct FruitsApp {
    static func main() async {
        let fruits = [
            Fruit(name: "apple", color: .red),
            Fruit(name: "lemon", color: .yellow),
            Fruit(name: "kiwi", color: .green)
        ]
        
        let view = FruitList(fruits: fruits)
        print(view.render())
    }
}

Inspection

Inspecting generated sequences can be a really useful feature in some scenarios.

Using previous example

@main
struct FruitsApp {
    static func main() async {
        let fruits = [
            Fruit(name: "apple", color: .red),
            Fruit(name: "lemon", color: .yellow),
            Fruit(name: "kiwi", color: .green)
        ]
        
        let view = FruitList(fruits: fruits)
        print(view.render())
        
        print(view.inspect(as: .escaped))
        // Prints \x1b[31mapple\x1b[0m\x1b[33mlemon\x1b[0m\x1b[32mkiwi\x1b[0m
        
        print(view.inspectList(as: .escaped))
        // Prints ["\\x1b", "[", "3", "1", "m", "apple", "\\x1b", "[", 
        // "0", "m", "\\x1b", "[", "3", "3", "m", "lemon", "\\x1b", "[", "0", 
        // "m", "\\x1b", "[", "3", "2", "m", "kiwi", "\\x1b", "[", "0", "m"]
        
        print(view.inspectList(as: .name))
        // Prints ["escape", "leftBracket", "digit3", "digit1", "m", "apple", "escape", 
        // "leftBracket", "digit0", "m", "escape", "leftBracket", "digit3", "digit3", 
        // "m", "lemon", "escape", "leftBracket", "digit0", "m", "escape", "leftBracket", 
        // "digit3", "digit2", "m", "kiwi", "escape", "leftBracket", "digit0", "m"]
    }
}

Requirements

• Swift 6.0+
• iOS 13.0+ / macOS 10.15+ / tvOS 13.0+ / watchOS 6.0+

License

This project is available under the MIT license. See the LICENSE file for more info.

Contributing

This project is still in early development. Contributions or suggestions are welcome, but please do not use this library in any projects yet.