swift-ui-commandline-tool.swift

#!/usr/bin/env xcrun -sdk macosx swift

// Displays UI in an NSWindow which can interact with the commandline
// Usage: `echo "Bar" | ./swift-ui-commandline-tool.swift`

import Foundation
import SwiftUI

extension CommandLine {
  static let input: String = { AnyIterator { readLine() }.joined() }()
}

struct App: SwiftUI.App {
  var body: some Scene {
    WindowGroup {
      VStack {
        Text("Hello, George!")
        Button("Print \"Foo\"") { print("Foo") }
        Button("Echo Input") { print(CommandLine.input) }
        Button("Done") { exit(0) }
      }
        .padding(100)
    }
      .windowStyle(HiddenTitleBarWindowStyle())
  }
}
App.main()

This is amazing. Thank you!

Happy to help, this code is a bit old so thank you for checking it still works :)

Very cool! For me the window wouldn't open unless:

DispatchQueue.main.async {
    NSApplication.shared.setActivationPolicy(.regular)
    NSApplication.shared.activate(ignoringOtherApps: true)
}
App.main()

Thanks! Yeah I haven't re-ran this in some time so it probably is a bit out of date.

You shouldn't need to run NSApplication.shared.setActivationPolicy(.regular) inside an async block. I'd also recommend running NSApplication.shared.activate() inside an onAppear modifier attached to a view, rather than in an async block

That actually works really well other than the input not working.

never mind, it works, I had the dumb

Oh, no not the dumb! Glad folks are still finding this useful!

It's very useful. I was wondering if you'd ever played around with setting it up to take multiple parameters that might be of different types, so like:

swift-ui-commandline-tool -myInt -"myString"?

Swift argument parser (https://github.com/apple/swift-argument-parser) is pretty good for this but it doesn’t work well with scripts. Some attempts have been made to add functionality to make this work better but as far as I know nothing has landed in the tool chain.