# Scripts/wmEnable

- `Download example`

…

## wmEnable.py

    #!/usr/bin/env python3
    """
    This is an evil undocumented SPI hack that shows how to enable GUI operation
    from a console application.

    BUNDLES ARE RECOMMENDED, USE THIS AT YOUR OWN RISK!!
    """
    import os
    import sys

    import objc
    from Foundation import NSBundle, NSObject

    def S(*args):
        return b"".join(args)

    OSErr = objc._C_SHT
    OUTPSN = b"o^{ProcessSerialNumber=LL}"
    INPSN = b"n^{ProcessSerialNumber=LL}"

    FUNCTIONS = [
        # These two are public API
        ("GetCurrentProcess", S(OSErr, OUTPSN)),
        ("SetFrontProcess", S(OSErr, INPSN)),
        # This is undocumented SPI
        ("CPSSetProcessName", S(OSErr, INPSN, objc._C_CHARPTR)),
        ("CPSEnableForegroundOperation", S(OSErr, INPSN)),
    ]

    def WMEnable(name="Python"):
        if not isinstance(name, bytes):
            name = name.encode("utf8")
        mainBundle = NSBundle.mainBundle()
        bPath = os.path.split(os.path.split(os.path.split(sys.executable)[0])[0])[0]
        if mainBundle.bundlePath() == bPath:
            return True
        bndl = NSBundle.bundleWithPath_(
            objc.pathForFramework(
                "/System/Library/Frameworks/ApplicationServices.framework"
            )
        )
        if bndl is None:
            print("ApplicationServices missing", file=sys.stderr)
            return False
        d = {}
        objc.loadBundleFunctions(bndl, d, FUNCTIONS)
        for (fn, _sig) in FUNCTIONS:
            if fn not in d:
                print("Missing", fn, file=sys.stderr)
                return False
        err, psn = d["GetCurrentProcess"](None)
        if err:
            print("GetCurrentProcess", (err, psn), file=sys.stderr)
            return False
        err = d["CPSSetProcessName"](psn, name)
        if err:
            print("CPSSetProcessName", (err, psn), file=sys.stderr)
            return False
        err = d["CPSEnableForegroundOperation"](psn)
        if err:
            print("CPSEnableForegroundOperation", (err, psn), file=sys.stderr)
            return False
        err = d["SetFrontProcess"](psn)
        if err:
            print("SetFrontProcess", (err, psn), file=sys.stderr)
            return False
        return True

    class AppDelegate(NSObject):
        def applicationDidFinishLaunching_(self, sender):
            AppKit.NSRunAlertPanel("WM Enabled", "WM was enabled!", None, None, None)
            AppKit.NSApp().terminate_(self)

    if __name__ == "__main__":
        if WMEnable(os.path.basename(os.path.splitext(sys.argv[0])[0])):
            import AppKit

            app = AppKit.NSApplication.sharedApplication()
            delegate = AppDelegate.alloc().init()
            app.setDelegate_(delegate)
            app.run()
        else:
            print("WM was not enabled")