fix: show android emulator window (closes #376)

src/api-wrappers/AXUIElement.swift

@@ -45,23 +45,43 @@ extension AXUIElement {
         return nil
     }
 
-    func isActualWindow(_ bundleIdentifier: String?, _ wid: CGWindowID, _ isOnNormalLevel: Bool, _ title: String?, _ subrole: String?, _ role: String?) -> Bool {
-        // Some non-windows have cgWindowId == 0 (e.g. windows of apps starting at login with the checkbox "Hidden" checked)
+    func isActualWindow(_ runningApp: NSRunningApplication, _ wid: CGWindowID, _ isOnNormalLevel: Bool, _ title: String?, _ subrole: String?, _ role: String?) -> Bool {
         // Some non-windows have title: nil (e.g. some OS elements)
         // Some non-windows have subrole: nil (e.g. some OS elements), "AXUnknown" (e.g. Bartender), "AXSystemDialog" (e.g. Intellij tooltips)
         // Minimized windows or windows of a hidden app have subrole "AXDialog"
         // Activity Monitor main window subrole is "AXDialog" for a brief moment at launch; it then becomes "AXStandardWindow"
-        // CGWindowLevel == .normalWindow helps filter out iStats Pro and other top-level pop-overs
+
+        // Some non-windows have cgWindowId == 0 (e.g. windows of apps starting at login with the checkbox "Hidden" checked)
         return wid != 0 &&
-            // don't show floating windows
+            // CGWindowLevel == .normalWindow helps filter out iStats Pro and other top-level pop-overs, and floating windows
             isOnNormalLevel &&
             (["AXStandardWindow", "AXDialog"].contains(subrole) ||
-                // All Steam windows have subrole == AXUnknown
-                // some dropdown menus are not desirable; they have title == "", or sometimes role == nil when switching between menus quickly
-                (bundleIdentifier == "com.valvesoftware.steam" && title != "" && role != nil) ||
-                // Firefox fullscreen video have subrole == AXUnknown if fullscreen'ed when the base window is not fullscreen
-                (bundleIdentifier == "org.mozilla.firefox" && role == "AXWindow")
-            )
+                steam(runningApp, title, role) ||
+                firefoxFullscreenVideo(runningApp, role) ||
+                androidEmulator(runningApp, title))
+    }
+
+    private func steam(_ runningApp: NSRunningApplication, _ title: String?, _ role: String?) -> Bool {
+        // All Steam windows have subrole == AXUnknown
+        // some dropdown menus are not desirable; they have title == "", or sometimes role == nil when switching between menus quickly
+        return runningApp.bundleIdentifier == "com.valvesoftware.steam" && title != "" && role != nil
+    }
+
+    private func firefoxFullscreenVideo(_ runningApp: NSRunningApplication, _ role: String?) -> Bool {
+        // Firefox fullscreen video have subrole == AXUnknown if fullscreen'ed when the base window is not fullscreen
+        return runningApp.bundleIdentifier == "org.mozilla.firefox" && role == "AXWindow"
+    }
+
+    private func androidEmulator(_ runningApp: NSRunningApplication, _ title: String?) -> Bool {
+        // android emulator small vertical menu is a "window" with empty title; we exclude it
+        if title != "",
+           // NSRunningApplication provides no way to identify the emulator; we pattern match on its KERN_PROCARGS
+           runningApp.bundleIdentifier == nil,
+           let executablePath = Sysctl.run([CTL_KERN, KERN_PROCARGS, runningApp.processIdentifier]) {
+            // example path: ~/Library/Android/sdk/emulator/qemu/darwin-x86_64/qemu-system-x86_64
+            return executablePath.range(of: "qemu-system[^/]*$", options: .regularExpression, range: nil, locale: nil) != nil
+        }
+        return false
     }
 
     func isOnNormalLevel(_ wid: CGWindowID) -> Bool {

src/api-wrappers/Sysctl.swift

@@ -9,6 +9,12 @@ public struct Sysctl {
         return run(name, { $0.baseAddress?.withMemoryRebound(to: T.self, capacity: 1) { $0.pointee } })
     }
 
+    static func run(_ keys: [Int32]) -> String? {
+        return data(keys)?.withUnsafeBufferPointer() { dataPointer -> String? in
+            dataPointer.baseAddress.flatMap { String(validatingUTF8: $0) }
+        }
+    }
+
     private static func run<R>(_ name: String, _ fn: (UnsafeBufferPointer<Int8>) -> R?) -> R? {
         return keys(name).flatMap { keys in data(keys)?.withUnsafeBufferPointer() { fn($0) } }
     }

src/logic/Application.swift

@@ -60,7 +60,7 @@ class Application: NSObject {
                             let subrole = try $0.subrole()
                             let role = try $0.role()
                             let isOnNormalLevel = $0.isOnNormalLevel(wid)
-                            if $0.isActualWindow(self.runningApplication.bundleIdentifier, wid, isOnNormalLevel, title, subrole, role) {
+                            if $0.isActualWindow(self.runningApplication, wid, isOnNormalLevel, title, subrole, role) {
                                 return ($0, wid, title, try $0.isFullscreen(), try $0.isMinimized(), try $0.position())
                             }
                         }

src/logic/events/AccessibilityEvents.swift

@@ -21,7 +21,7 @@ func retryUntilTimeout(_ fn: @escaping () throws -> Void, _ startTime: DispatchT
 }
 
 func handleEvent(_ type: String, _ element: AXUIElement) throws {
-    debugPrint("Accessibility event", type, element)
+    debugPrint("Accessibility event", type, try element.title())
     // events are handled concurrently, thus we check that the app is still running
     if let pid = try element.pid() {
         switch type {
@@ -102,7 +102,7 @@ private func windowCreated(_ element: AXUIElement, _ pid: pid_t) throws {
             // a window being un-minimized can trigger kAXWindowCreatedNotification
             if Windows.list.firstIndexThatMatches(element, wid) == nil,
                let runningApp = NSRunningApplication(processIdentifier: pid),
-               element.isActualWindow(runningApp.bundleIdentifier, wid, isOnNormalLevel, axTitle, subrole, role),
+               element.isActualWindow(runningApp, wid, isOnNormalLevel, axTitle, subrole, role),
                let app = (Applications.list.first { $0.runningApplication.processIdentifier == pid }) {
                 let window = Window(element, app, wid, axTitle, isFullscreen, isMinimized, position)
                 Windows.list.insertAndScaleRecycledPool(window, at: 0)
@@ -127,7 +127,7 @@ private func focusedWindowChanged(_ element: AXUIElement, _ pid: pid_t) throws {
                 Windows.list.insertAndScaleRecycledPool(Windows.list.remove(at: existingIndex), at: 0)
                 App.app.refreshOpenUi([Windows.list[0], Windows.list[existingIndex]])
             } else if let runningApp = NSRunningApplication(processIdentifier: pid),
-                element.isActualWindow(runningApp.bundleIdentifier, wid, isOnNormalLevel, axTitle, subrole, role),
+                element.isActualWindow(runningApp, wid, isOnNormalLevel, axTitle, subrole, role),
                       let app = (Applications.list.first { $0.runningApplication.processIdentifier == pid }) {
                 Windows.list.insertAndScaleRecycledPool(Window(element, app, wid, axTitle, isFullscreen, isMinimized, position), at: 0)
                 App.app.refreshOpenUi([Windows.list[0]])