Drawing Native OSX Windows with D

[Mike McKee via Digitalmars-d-learn]

A few interesting things here. I tried to do these things via the 
new Apple language, Swift.

* You can enum windows, but unlike Microsoft Windows, you have no 
permissions to hide a window. BTW, hiding a window is a window 
object method called orderOut(nil), and they only permit it on 
your own windows, not another application's windows. However, 
that said, there's a neat AppleScript technique that seems to 
work in hiding the entire application, rather than just the 
window.

osascript -e "tell application "System Events" to set visible of 
process "Installer" to false'

* You can enum Cocoa windows and get x,y,w,h, process ID, window 
name, and window number (I guess that's an ID) on each. Here's 
the technique in Swift:

     import Foundation;
     import Cocoa;

     let windows = CGWindowListCopyWindowInfo(
         CGWindowListOption.OptionOnScreenOnly,
         CGWindowID(0))! as NSArray;
     for var i = 0; i < windows.count; i++  {
         let window = windows[i];
         let owner = window["kCGWindowOwnerName"] as! String;
         if owner != "Installer" {
             continue;
         }
        // do something with your window object here
     }

I don't know how to do this in D, but came up with a workaround. 
My pkg installer will run a Bash script which will hide the 
Installer window via osascript, show a window that I drew with 
Swift that basically tells people to wait because it's 
downloading components, runs curl to download the payload from 
the server and copy it into the appropriate places (as well as 
set up system library stuff as needed), and then hide my custom 
Swift window (the progress window), and then uses osascript again 
to unhide the installer application.