Add UserApp class to RSCore. It represents an of the type usually found in /Applications. A UserApp may or may not be running and may or may not exist locally on disk. It could be entirely fictional, even.

Frameworks/RSCore/RSCore.xcodeproj/project.pbxproj

@@ -71,6 +71,7 @@
 		842E45CC1ED623C7000A8B52 /* UniqueIdentifier.swift in Sources */ = {isa = PBXBuildFile; fileRef = 842E45CB1ED623C7000A8B52 /* UniqueIdentifier.swift */; };
 		8432B1861DACA0E90057D6DF /* NSResponder-Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8432B1851DACA0E90057D6DF /* NSResponder-Extensions.swift */; };
 		8432B1881DACA2060057D6DF /* NSWindow-Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8432B1871DACA2060057D6DF /* NSWindow-Extensions.swift */; };
+		8434D15C200BD6F400D6281E /* UserApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8434D15B200BD6F400D6281E /* UserApp.swift */; };
 		84411E731FE5FFC3004B527F /* NSImage+RSCore.swift in Sources */ = {isa = PBXBuildFile; fileRef = 84411E721FE5FFC3004B527F /* NSImage+RSCore.swift */; };
 		844B5B571FE9D36000C7C76A /* Keyboard.swift in Sources */ = {isa = PBXBuildFile; fileRef = 844B5B561FE9D36000C7C76A /* Keyboard.swift */; };
 		844C915B1B65753E0051FC1B /* RSPlist.h in Headers */ = {isa = PBXBuildFile; fileRef = 844C91591B65753E0051FC1B /* RSPlist.h */; settings = {ATTRIBUTES = (Public, ); }; };
@@ -191,6 +192,7 @@
 		842E45CB1ED623C7000A8B52 /* UniqueIdentifier.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = UniqueIdentifier.swift; sourceTree = "<group>"; };
 		8432B1851DACA0E90057D6DF /* NSResponder-Extensions.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "NSResponder-Extensions.swift"; sourceTree = "<group>"; };
 		8432B1871DACA2060057D6DF /* NSWindow-Extensions.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "NSWindow-Extensions.swift"; sourceTree = "<group>"; };
+		8434D15B200BD6F400D6281E /* UserApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = UserApp.swift; path = AppKit/UserApp.swift; sourceTree = "<group>"; };
 		84411E721FE5FFC3004B527F /* NSImage+RSCore.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = "NSImage+RSCore.swift"; path = "Images/NSImage+RSCore.swift"; sourceTree = "<group>"; };
 		844B5B561FE9D36000C7C76A /* Keyboard.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; name = Keyboard.swift; path = RSCore/Keyboard.swift; sourceTree = "<group>"; };
 		844C91591B65753E0051FC1B /* RSPlist.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = RSPlist.h; path = RSCore/RSPlist.h; sourceTree = "<group>"; };
@@ -460,6 +462,7 @@
 				84C687311FBAA3DF00345C9E /* LogWindowController.swift */,
 				84C687341FBC025600345C9E /* Log.swift */,
 				84C687371FBC028900345C9E /* LogItem.swift */,
+				8434D15B200BD6F400D6281E /* UserApp.swift */,
 				842DD7F91E1499FA00E061EB /* Views */,
 			);
 			name = AppKit;
@@ -794,6 +797,7 @@
 				842E45CC1ED623C7000A8B52 /* UniqueIdentifier.swift in Sources */,
 				84A8358A1D4EC7B80004C598 /* PlistProviderProtocol.swift in Sources */,
 				849A339E1AC90A0A0015BA09 /* NSTableView+RSCore.m in Sources */,
+				8434D15C200BD6F400D6281E /* UserApp.swift in Sources */,
 				84CFF51B1AC3C77500CEA6C8 /* RSPlatform.m in Sources */,
 				845A291F1FC8BC49007B49E3 /* BinaryDiskCache.swift in Sources */,
 				84CFF52C1AC3CA9700CEA6C8 /* NSData+RSCore.m in Sources */,

Frameworks/RSCore/RSCore/AppKit/UserApp.swift

@@ -0,0 +1,123 @@
+//
+//  UserApp.swift
+//  RSCore
+//
+//  Created by Brent Simmons on 1/14/18.
+//  Copyright © 2018 Ranchero Software, LLC. All rights reserved.
+//
+
+import Cocoa
+
+// Represents an app (the type of app mostly found in /Applications.)
+// The app may or may not be running. It may or may not exist.
+
+final class UserApp {
+
+	let bundleID: String
+	var icon: NSImage? = nil
+	var existsOnDisk = false
+	var path: String? = nil
+	var runningApplication: NSRunningApplication? = nil
+
+	var isRunning: Bool {
+
+		updateStatus()
+		if let runningApplication = runningApplication {
+			return !runningApplication.isTerminated
+		}
+		return false
+	}
+
+	init(bundleID: String) {
+
+		self.bundleID = bundleID
+		updateStatus()
+	}
+
+	func updateStatus() {
+
+		if let runningApplication = runningApplication, runningApplication.isTerminated {
+			self.runningApplication = nil
+		}
+
+		let runningApplications = NSRunningApplication.runningApplications(withBundleIdentifier: bundleID)
+		for app in runningApplications {
+			if let runningApplication = runningApplication {
+				if app == runningApplication {
+					break
+				}
+			}
+			else {
+				if !app.isTerminated {
+					runningApplication = app
+					break
+				}
+			}
+		}
+
+		if let runningApplication = runningApplication {
+			existsOnDisk = true
+			icon = runningApplication.icon
+			if let bundleURL = runningApplication.bundleURL {
+				path = bundleURL.path
+			}
+			else {
+				path = NSWorkspace.shared.absolutePathForApplication(withBundleIdentifier: bundleID)
+			}
+			if icon == nil, let path = path {
+				icon = NSWorkspace.shared.icon(forFile: path)
+			}
+			return
+		}
+
+		path = NSWorkspace.shared.absolutePathForApplication(withBundleIdentifier: bundleID)
+		if let path = path {
+			if icon == nil {
+				icon = NSWorkspace.shared.icon(forFile: path)
+			}
+			existsOnDisk = true
+		}
+		else {
+			existsOnDisk = false
+			icon = nil
+		}
+	}
+
+	func launchIfNeeded() -> Bool {
+
+		// Return true if already running.
+		// Return true if not running and successfully gets launched.
+
+		updateStatus()
+		if isRunning {
+			return true
+		}
+
+		guard existsOnDisk, let path = path else {
+			return false
+		}
+
+		let url = URL(fileURLWithPath: path)
+		if let app = try? NSWorkspace.shared.launchApplication(at: url, options: [.withErrorPresentation], configuration: [:]) {
+			runningApplication = app
+			if app.isFinishedLaunching {
+				return true
+			}
+			Thread.sleep(forTimeInterval: 0.5) // Give the app time to launch. This is ugly.
+			return true
+		}
+
+		return false
+	}
+
+	func bringToFront() -> Bool {
+
+		// Activates the app, ignoring other apps.
+		// Does not automatically launch the app first.
+
+		updateStatus()
+		return runningApplication?.activate(options: [.activateIgnoringOtherApps]) ?? false
+	}
+}
+
+