Execute+Conditionals.swift

import Foundation

public enum Platform {
    case iOS
    case iOSOnMac
    case mac
}

public func execute(if condition: Bool, _ action: () -> Void) {
    if condition {
        action()
    }
}

public func execute(if platform: Platform, _ action: () -> Void) {
    if currentPlatform == platform {
        action()
    }
}

public func execute(iOS: (() -> Void) = {}, iOSOnMac: () -> Void = {}, mac: () -> Void = {}) {
    switch currentPlatform {

    case .iOS:
        iOS()

    case .iOSOnMac:
        iOSOnMac()

    case .mac:
        mac()

    }
}

public func execute<P>(iOS: @autoclosure () -> P, iOSOnMac: @autoclosure () -> P, mac: @autoclosure () -> P) -> P {
    switch currentPlatform {

    case .iOS:
        return iOS()

    case .iOSOnMac:
        return iOSOnMac()

    case .mac:
        return mac()

    }
}

private var currentPlatform: Platform {
#if os(macOS)
    return .mac
#else
    if ProcessInfo.processInfo.isiOSAppOnMac {
        return .iOSOnMac
    } else {
        return .iOS
    }
#endif
}