How to compile Swift from command line - swift

Question

I have these 3 files:
index.swift
import Cocoa
print("Init")
let app = NSApplication.shared()
let delegate = AppDelegate() // alloc main app's delegate class
app.delegate = delegate // set as app's delegate
app.run()
print("End")
src/delegate.swift
import Cocoa
class AppDelegate: NSObject, NSApplicationDelegate {
var newWindow: NSWindow?
var controller: ViewController?
override init() {
print("App")
super.init()
mainView()
}
func mainView() {
print("View")
newWindow = NSWindow(contentRect: NSMakeRect(10, 10, 200, 200), styleMask: [.titled, .resizable, .closable], backing: .buffered, defer: false)
let content = newWindow!.contentView! as NSView
controller = ViewController()
//controller?.loadView()
let view = controller!.view
content.addSubview(view)
newWindow!.makeKeyAndOrderFront(nil)
}
func applicationDidFinishLaunching(aNotification: NSNotification) {
print("Launch") // Not showing this?
}
func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
print("Bye")
return true
}
}
src/controller.swift
import Cocoa
class ViewController : NSViewController {
var name = "Main"
var button: NSButton?
#IBAction func onClick(_: Any) {
print("Click")
}
override func loadView() {
print("Load")
let view = NSView(frame: NSMakeRect(0,0,200,200))
view.wantsLayer = true
view.layer?.borderWidth = 2
view.layer?.borderColor = NSColor.red.cgColor
button = NSButton(frame: NSMakeRect(20, 20, 100, 32))
button?.title = "Click Me"
button?.target = self
button?.action = #selector(onClick)
view.addSubview(button!)
self.view = view
}
}
I tried compiling it like this:
swift index.swift src/delegate.swift src/controller.swift
But get this error:
index.swift:7:16: error: use of unresolved identifier 'AppDelegate'
let delegate = AppDelegate() // alloc main app's delegate class
^~~~~~~~~~~
Foundation.PortDelegate:1:17: note: did you mean 'PortDelegate'?
public protocol PortDelegate : NSObjectProtocol {
^
CoreText.CTRunDelegate:1:14: note: did you mean 'CTRunDelegate'?
public class CTRunDelegate {
^
<unknown>:0: warning: 'cacheParamsComputed' is deprecated
<unknown>:0: warning: 'cacheAlphaComputed' is deprecated
<unknown>:0: warning: 'keepCacheWindow' is deprecated
<unknown>:0: error: 'memoryless' is unavailable
Metal.MTLCommandBufferError:55:14: note: 'memoryless' has been explicitly marked unavailable here
case memoryless
^
Wondering how to get this compiling. Basically, I only need to know how to require/import these classes AppDelegate and ViewController from where they are currently defined into the scope of index.swift. If I place all the code into 1 file index.swift, then it compiles fine. But I would like to modularize it like you do in XCode, but without invoking XCode. Wondering if this can be solved with a plist of some sort. I tried swift -F and swift -I to specify import directories, but no go.

Answer 1

As #MartinR said, swiftc is the compiler. Your swift command invokes the interpreter, not the compiler. I think the interpreter can only run a single file.
I've only skimmed the following pages, but they may help you run a Swift program consisting of multiple files.
Use a simple shell script to merge all files into one and run the merged file through the swift interpreter:
http://sgeos.github.io/swift/2016/02/09/getting-started-with-multi-file-command-line-swift.html
Use built-in Swift tools:
create a project with swift package init --type executable
use swift build to compile the project into a single executable
https://medium.com/quick-code/lets-build-a-command-line-app-in-swift-328ce274f1cc
I found these (and many similar) pages by searching: swift command line run multiple files