fix: ignore more non-user-facing apps (xpc processes)

src/api-wrappers/HelperExtensions.swift

@@ -170,3 +170,10 @@ extension pid_t {
         return kinfo.kp_proc.p_stat == SZOMB
     }
 }
+
+extension String {
+    // convert a FourCharCode into a String
+    init(_ fourCharCode: FourCharCode) { // or `OSType`, or `UInt32`
+        self = NSFileTypeForHFSTypeCode(fourCharCode).trimmingCharacters(in: CharacterSet(charactersIn: "'"))
+    }
+}

src/api-wrappers/PrivateApis.swift

@@ -136,6 +136,16 @@ func setNativeCommandTabEnabled(_ isEnabled: Bool) {
     CGSSetSymbolicHotKeyEnabled(2, isEnabled) // command+shift+tab
 }
 
+// returns info about a given psn
+// * macOS 10.9-10.15 (officially removed in 10.9, but available as a private API still)
+@_silgen_name("GetProcessInformation") @discardableResult
+func GetProcessInformation(_ psn: inout ProcessSerialNumber, _ info: inout ProcessInfoRec) -> OSErr
+//
+// returns the psn for a given pid
+// * macOS 10.9-10.15 (officially removed in 10.9, but available as a private API still)
+@_silgen_name("GetProcessForPID") @discardableResult
+func GetProcessForPID(_ pid: pid_t, _ psn: inout ProcessSerialNumber) -> OSStatus
+
 
 // ------------------------------------------------------------
 // below are some notes on some private APIs I experimented with
@@ -190,16 +200,6 @@ func setNativeCommandTabEnabled(_ isEnabled: Bool) {
 //@_silgen_name("GetProcessPID")
 //func GetProcessPID(_ psn: inout ProcessSerialNumber, _ pid: inout pid_t) -> Void
 //
-//// returns info about a given psn
-//// * macOS 10.9-
-//@_silgen_name("GetProcessInformation") @discardableResult
-//func GetProcessInformation(_ psn: inout ProcessSerialNumber, _ info: inout ProcessInfoRec) -> OSErr
-//
-//// returns the psn for a given pid
-//// * macOS 10.9-
-//@_silgen_name("GetProcessForPID") @discardableResult
-//func GetProcessForPID(_ pid: pid_t, _ psn: inout ProcessSerialNumber) -> OSStatus
-//
 //// crashed the app with SIGSEGV
 //// * macOS 10.10+
 //@_silgen_name("CGSGetWindowType") @discardableResult

src/logic/Applications.swift

@@ -101,14 +101,18 @@ class Applications {
     }
 
     private static func isActualApplication(_ app: NSRunningApplication) -> Bool {
-        return (app.activationPolicy != .prohibited || isNotXpc(app)) && !app.processIdentifier.isZombie()
+        // an app can be both activationPolicy == .accessory and XPC (e.g. com.apple.dock.etci)
+        return app.activationPolicy != .prohibited && isNotXpc(app) && !app.processIdentifier.isZombie()
     }
 
     private static func isNotXpc(_ app: NSRunningApplication) -> Bool {
-        return app.bundleURL
-            .flatMap { Bundle(url: $0) }
-            .flatMap { $0.infoDictionary }
-            .flatMap { $0["CFBundlePackageType"] as? String } != "XPC!"
+        // these private APIs are more reliable than Bundle.init? as it can return nil (e.g. for com.apple.dock.etci)
+        var psn = ProcessSerialNumber()
+        GetProcessForPID(app.processIdentifier, &psn)
+        var info = ProcessInfoRec()
+        GetProcessInformation(&psn, &info)
+        debugPrint(app.bundleIdentifier, String(info.processType))
+        return String(info.processType) != "XPC!"
     }
 
     // managing AltTab windows within AltTab create all sorts of side effects