Split out libraries into SPM packages (#298)

Sources/Secretive/Controllers/AgentStatusChecker.swift

@@ -0,0 +1,48 @@
+import Foundation
+import Combine
+import AppKit
+import SecretKit
+
+protocol AgentStatusCheckerProtocol: ObservableObject {
+    var running: Bool { get }
+    var developmentBuild: Bool { get }
+}
+
+class AgentStatusChecker: ObservableObject, AgentStatusCheckerProtocol {
+
+    @Published var running: Bool = false
+
+    init() {
+        check()
+    }
+
+    func check() {
+        running = instanceSecretAgentProcess != nil
+    }
+
+    // All processes, including ones from older versions, etc
+    var secretAgentProcesses: [NSRunningApplication] {
+        NSRunningApplication.runningApplications(withBundleIdentifier: Bundle.main.agentBundleID)
+    }
+
+    // The process corresponding to this instance of Secretive
+    var instanceSecretAgentProcess: NSRunningApplication? {
+        let agents = secretAgentProcesses
+        for agent in agents {
+            guard let url = agent.bundleURL else { continue }
+            if url.absoluteString.hasPrefix(Bundle.main.bundleURL.absoluteString) {
+                return agent
+            }
+        }
+        return nil
+    }
+
+
+    // Whether Secretive is being run in an Xcode environment.
+    var developmentBuild: Bool {
+        Bundle.main.bundleURL.absoluteString.contains("/Library/Developer/Xcode")
+    }
+
+}
+
+