func waitUntilDone()

in Diffusion/Common/Downloader.swift [59:76]

• 16 lines of code
• 5 McCabe index (conditional complexity)

    func waitUntilDone() throws -> URL {
        // It's either this, or stream the bytes ourselves (add to a buffer, save to disk, etc; boring and finicky)
        let semaphore = DispatchSemaphore(value: 0)
        stateSubscriber = downloadState.sink { state in
            switch state {
            case .completed: semaphore.signal()
            case .failed:    semaphore.signal()
            default:         break
            }
        }
        semaphore.wait()
        
        switch downloadState.value {
        case .completed(let url): return url
        case .failed(let error):  throw error
        default:                  throw("Should never happen, lol")
        }
    }