my stuff

5GUIs.xcodeproj/project.pbxproj

@@ -7,6 +7,11 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		6B1A06FB2C3566F4009A4C2D /* BundleFeatureDetectionOperation.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6B1A06FA2C3566F4009A4C2D /* BundleFeatureDetectionOperation.swift */; };
+		6B1A07032C356845009A4C2D /* test_nateApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6B1A07022C356845009A4C2D /* test_nateApp.swift */; };
+		6B1A07052C356845009A4C2D /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6B1A07042C356845009A4C2D /* ContentView.swift */; };
+		6B1A07072C356846009A4C2D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 6B1A07062C356846009A4C2D /* Assets.xcassets */; };
+		6B1A070A2C356846009A4C2D /* Preview Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 6B1A07092C356846009A4C2D /* Preview Assets.xcassets */; };
 		E83E32BF25220277009BE980 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = E83E32BE25220277009BE980 /* Assets.xcassets */; };
 		E83E32C225220277009BE980 /* Preview Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = E83E32C125220277009BE980 /* Preview Assets.xcassets */; };
 		E83E32C525220277009BE980 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = E83E32C325220277009BE980 /* Main.storyboard */; };
@@ -28,7 +33,6 @@
 		E8F1C42825260051000B517B /* DetailsPopover.swift in Sources */ = {isa = PBXBuildFile; fileRef = E8F1C40F25260051000B517B /* DetailsPopover.swift */; };
 		E8F1C42925260051000B517B /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = E8F1C41025260051000B517B /* ContentView.swift */; };
 		E8F1C42A25260051000B517B /* MainFileView.swift in Sources */ = {isa = PBXBuildFile; fileRef = E8F1C41125260051000B517B /* MainFileView.swift */; };
-		E8F1C42B25260051000B517B /* BundleFeatureDetectionOperation.swift in Sources */ = {isa = PBXBuildFile; fileRef = E8F1C41325260051000B517B /* BundleFeatureDetectionOperation.swift */; };
 		E8F1C42C25260051000B517B /* InfoDict.swift in Sources */ = {isa = PBXBuildFile; fileRef = E8F1C41425260051000B517B /* InfoDict.swift */; };
 		E8F1C42D25260051000B517B /* FakeDetectionStepper.swift in Sources */ = {isa = PBXBuildFile; fileRef = E8F1C41525260051000B517B /* FakeDetectionStepper.swift */; };
 		E8F1C42E25260051000B517B /* FakeStepConfigs.swift in Sources */ = {isa = PBXBuildFile; fileRef = E8F1C41625260051000B517B /* FakeStepConfigs.swift */; };
@@ -40,6 +44,13 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
+		6B1A06FA2C3566F4009A4C2D /* BundleFeatureDetectionOperation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BundleFeatureDetectionOperation.swift; sourceTree = "<group>"; };
+		6B1A07002C356845009A4C2D /* test-nate.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = "test-nate.app"; sourceTree = BUILT_PRODUCTS_DIR; };
+		6B1A07022C356845009A4C2D /* test_nateApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = test_nateApp.swift; sourceTree = "<group>"; };
+		6B1A07042C356845009A4C2D /* ContentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
+		6B1A07062C356846009A4C2D /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
+		6B1A07092C356846009A4C2D /* Preview Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = "Preview Assets.xcassets"; sourceTree = "<group>"; };
+		6B1A070B2C356846009A4C2D /* test_nate.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = test_nate.entitlements; sourceTree = "<group>"; };
 		E83E32B725220275009BE980 /* 5 GUIs.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = "5 GUIs.app"; sourceTree = BUILT_PRODUCTS_DIR; };
 		E83E32BE25220277009BE980 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		E83E32C125220277009BE980 /* Preview Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = "Preview Assets.xcassets"; sourceTree = "<group>"; };
@@ -66,7 +77,6 @@
 		E8F1C40F25260051000B517B /* DetailsPopover.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = DetailsPopover.swift; sourceTree = "<group>"; };
 		E8F1C41025260051000B517B /* ContentView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
 		E8F1C41125260051000B517B /* MainFileView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = MainFileView.swift; sourceTree = "<group>"; };
-		E8F1C41325260051000B517B /* BundleFeatureDetectionOperation.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = BundleFeatureDetectionOperation.swift; path = ../Sources/5GUIs/BundleFeatureDetectionOperation.swift; sourceTree = "<group>"; };
 		E8F1C41425260051000B517B /* InfoDict.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = InfoDict.swift; sourceTree = "<group>"; };
 		E8F1C41525260051000B517B /* FakeDetectionStepper.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FakeDetectionStepper.swift; sourceTree = "<group>"; };
 		E8F1C41625260051000B517B /* FakeStepConfigs.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FakeStepConfigs.swift; sourceTree = "<group>"; };
@@ -80,6 +90,13 @@
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
+		6B1A06FD2C356845009A4C2D /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		E83E32B425220275009BE980 /* Frameworks */ = {
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
@@ -90,11 +107,32 @@
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		6B1A07012C356845009A4C2D /* test-nate */ = {
+			isa = PBXGroup;
+			children = (
+				6B1A07022C356845009A4C2D /* test_nateApp.swift */,
+				6B1A07042C356845009A4C2D /* ContentView.swift */,
+				6B1A07062C356846009A4C2D /* Assets.xcassets */,
+				6B1A070B2C356846009A4C2D /* test_nate.entitlements */,
+				6B1A07082C356846009A4C2D /* Preview Content */,
+			);
+			path = "test-nate";
+			sourceTree = "<group>";
+		};
+		6B1A07082C356846009A4C2D /* Preview Content */ = {
+			isa = PBXGroup;
+			children = (
+				6B1A07092C356846009A4C2D /* Preview Assets.xcassets */,
+			);
+			path = "Preview Content";
+			sourceTree = "<group>";
+		};
 		E83E32AE25220275009BE980 = {
 			isa = PBXGroup;
 			children = (
 				E8F1C437252600A9000B517B /* README.md */,
 				E83E32B925220275009BE980 /* 5GUIs */,
+				6B1A07012C356845009A4C2D /* test-nate */,
 				E83E32B825220275009BE980 /* Products */,
 			);
 			sourceTree = "<group>";
@@ -103,6 +141,7 @@
 			isa = PBXGroup;
 			children = (
 				E83E32B725220275009BE980 /* 5 GUIs.app */,
+				6B1A07002C356845009A4C2D /* test-nate.app */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -115,7 +154,6 @@
 				E8F1C41B25260051000B517B /* Style.swift */,
 				E8F1C41A25260051000B517B /* WindowState.swift */,
 				E8F1C41925260051000B517B /* Windows.swift */,
-				E8F1C41325260051000B517B /* BundleFeatureDetectionOperation.swift */,
 				E8F1C41225260051000B517B /* Model */,
 				E8F1C40725260051000B517B /* Views */,
 				E8F1C40125260051000B517B /* Utilities */,
@@ -125,6 +163,7 @@
 				E83E32C625220277009BE980 /* Info.plist */,
 				E83E32C725220277009BE980 /* _GUIs.entitlements */,
 				E83E32C025220277009BE980 /* Preview Content */,
+				6B1A06FA2C3566F4009A4C2D /* BundleFeatureDetectionOperation.swift */,
 			);
 			path = 5GUIs;
 			sourceTree = "<group>";
@@ -236,6 +275,23 @@
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
+		6B1A06FF2C356845009A4C2D /* test-nate */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 6B1A070C2C356846009A4C2D /* Build configuration list for PBXNativeTarget "test-nate" */;
+			buildPhases = (
+				6B1A06FC2C356845009A4C2D /* Sources */,
+				6B1A06FD2C356845009A4C2D /* Frameworks */,
+				6B1A06FE2C356845009A4C2D /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = "test-nate";
+			productName = "test-nate";
+			productReference = 6B1A07002C356845009A4C2D /* test-nate.app */;
+			productType = "com.apple.product-type.application";
+		};
 		E83E32B625220275009BE980 /* 5GUIs */ = {
 			isa = PBXNativeTarget;
 			buildConfigurationList = E83E32CA25220277009BE980 /* Build configuration list for PBXNativeTarget "5GUIs" */;
@@ -260,9 +316,12 @@
 		E83E32AF25220275009BE980 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastSwiftUpdateCheck = 1200;
+				LastSwiftUpdateCheck = 1540;
 				LastUpgradeCheck = 1200;
 				TargetAttributes = {
+					6B1A06FF2C356845009A4C2D = {
+						CreatedOnToolsVersion = 15.4;
+					};
 					E83E32B625220275009BE980 = {
 						CreatedOnToolsVersion = 12.0;
 						LastSwiftMigration = 1200;
@@ -283,11 +342,21 @@
 			projectRoot = "";
 			targets = (
 				E83E32B625220275009BE980 /* 5GUIs */,
+				6B1A06FF2C356845009A4C2D /* test-nate */,
 			);
 		};
 /* End PBXProject section */
 
 /* Begin PBXResourcesBuildPhase section */
+		6B1A06FE2C356845009A4C2D /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				6B1A070A2C356846009A4C2D /* Preview Assets.xcassets in Resources */,
+				6B1A07072C356846009A4C2D /* Assets.xcassets in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		E83E32B525220275009BE980 /* Resources */ = {
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
@@ -325,6 +394,15 @@
 /* End PBXShellScriptBuildPhase section */
 
 /* Begin PBXSourcesBuildPhase section */
+		6B1A06FC2C356845009A4C2D /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				6B1A07052C356845009A4C2D /* ContentView.swift in Sources */,
+				6B1A07032C356845009A4C2D /* test_nateApp.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 		E83E32B325220275009BE980 /* Sources */ = {
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
@@ -339,7 +417,6 @@
 				E8F1C42C25260051000B517B /* InfoDict.swift in Sources */,
 				E8F1C43325260051000B517B /* Style.swift in Sources */,
 				E8F1C42F25260051000B517B /* LoadBundleImage.swift in Sources */,
-				E8F1C42B25260051000B517B /* BundleFeatureDetectionOperation.swift in Sources */,
 				E8F1C42825260051000B517B /* DetailsPopover.swift in Sources */,
 				E8F1C42725260051000B517B /* InfoPanel.swift in Sources */,
 				E8F1C41E25260051000B517B /* URLItems.swift in Sources */,
@@ -354,6 +431,7 @@
 				E8F1C42A25260051000B517B /* MainFileView.swift in Sources */,
 				E8F1C42225260051000B517B /* SpinnerView.swift in Sources */,
 				E8F1C42325260051000B517B /* PleaseDropAFileView.swift in Sources */,
+				6B1A06FB2C3566F4009A4C2D /* BundleFeatureDetectionOperation.swift in Sources */,
 				E8F1C42525260051000B517B /* SorryNotAnExecutableView.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -372,6 +450,69 @@
 /* End PBXVariantGroup section */
 
 /* Begin XCBuildConfiguration section */
+		6B1A070D2C356846009A4C2D /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CODE_SIGN_ENTITLEMENTS = "test-nate/test_nate.entitlements";
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_ASSET_PATHS = "\"test-nate/Preview Content\"";
+				ENABLE_PREVIEWS = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_KEY_NSHumanReadableCopyright = "";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/../Frameworks",
+				);
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				MACOSX_DEPLOYMENT_TARGET = 14.5;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = "nl.lengrand.test-nate";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "DEBUG $(inherited)";
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Debug;
+		};
+		6B1A070E2C356846009A4C2D /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CODE_SIGN_ENTITLEMENTS = "test-nate/test_nate.entitlements";
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_ASSET_PATHS = "\"test-nate/Preview Content\"";
+				ENABLE_PREVIEWS = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu17;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_KEY_NSHumanReadableCopyright = "";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/../Frameworks",
+				);
+				LOCALIZATION_PREFERS_STRING_CATALOGS = YES;
+				MACOSX_DEPLOYMENT_TARGET = 14.5;
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = "nl.lengrand.test-nate";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_VERSION = 5.0;
+			};
+			name = Release;
+		};
 		E83E32C825220277009BE980 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
@@ -499,7 +640,7 @@
 				COMBINE_HIDPI_IMAGES = YES;
 				CURRENT_PROJECT_VERSION = 7;
 				DEVELOPMENT_ASSET_PATHS = "\"5GUIs/Preview Content\"";
-				DEVELOPMENT_TEAM = 4GXF3JAMM4;
+				DEVELOPMENT_TEAM = 9W4T5R5M9Y;
 				ENABLE_HARDENED_RUNTIME = YES;
 				ENABLE_PREVIEWS = YES;
 				INFOPLIST_FILE = 5GUIs/Info.plist;
@@ -529,7 +670,7 @@
 				COMBINE_HIDPI_IMAGES = YES;
 				CURRENT_PROJECT_VERSION = 7;
 				DEVELOPMENT_ASSET_PATHS = "\"5GUIs/Preview Content\"";
-				DEVELOPMENT_TEAM = 4GXF3JAMM4;
+				DEVELOPMENT_TEAM = 9W4T5R5M9Y;
 				ENABLE_HARDENED_RUNTIME = YES;
 				ENABLE_PREVIEWS = YES;
 				INFOPLIST_FILE = 5GUIs/Info.plist;
@@ -549,6 +690,15 @@
 /* End XCBuildConfiguration section */
 
 /* Begin XCConfigurationList section */
+		6B1A070C2C356846009A4C2D /* Build configuration list for PBXNativeTarget "test-nate" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				6B1A070D2C356846009A4C2D /* Debug */,
+				6B1A070E2C356846009A4C2D /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 		E83E32B225220275009BE980 /* Build configuration list for PBXProject "5GUIs" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (

5GUIs/BundleFeatureDetectionOperation.swift

@@ -0,0 +1,328 @@
+//
+//  BundleFeatureDetectionOperation.swift
+//  5 GUIs
+//
+//  Created by Helge Heß on 28.09.20.
+//
+
+import SwiftUI
+
+protocol BundleFeatureDetectionOperationDelegate: AnyObject {
+  func detectionStateDidChange(_ state: BundleFeatureDetectionOperation)
+}
+
+/**
+ * This is the main "operation" object which runs from a background queue and
+ * collects all the info we want.
+ */
+final class BundleFeatureDetectionOperation: ObservableObject {
+  // FIXME: this is more like a 'load operation'. But we can't use plain
+  //        Operation, because we are async (would need to do that boilerplate).
+
+  weak var delegate : BundleFeatureDetectionOperationDelegate?
+
+  enum State: Equatable {
+    case processing
+    case failedToOpen(Swift.Error?)
+    case notAnApplication
+    case finished
+    static func == (lhs: State, rhs: State) -> Bool {
+      switch ( lhs, rhs ) {
+        case ( .processing       , .processing       ): return true
+        case ( .failedToOpen     , .failedToOpen     ): return true
+        case ( .notAnApplication , .notAnApplication ): return true
+        case ( .finished         , .finished         ): return true
+        default: return false
+      }
+    }
+  }
+
+  let fm  = FileManager.default
+
+  @Published var state = State.processing {
+    didSet {
+      assert(_dispatchPreconditionTest(.onQueue(.main)))
+      delegate?.detectionStateDidChange(self)
+    }
+  }
+  @Published var info : ExecutableFileTechnologyInfo {
+    // Careful w/ accessing this within the operation, you can't!!! Threads.
+    didSet {
+      assert(_dispatchPreconditionTest(.onQueue(.main)))
+      delegate?.detectionStateDidChange(self)
+    }
+  }
+  @Published var otoolAvailable = true
+
+  let url : URL
+
+  private let nesting : Int
+
+  init(_ url: URL, nesting: Int = 1) {
+    self.url     = url
+    self.info    = ExecutableFileTechnologyInfo(fileURL: url)
+    self.nesting = nesting
+  }
+  func resume() {
+    DispatchQueue.global().async {
+      self.startWork()
+    }
+  }
+
+
+  // MARK: - Just some threadsafe helpers ...
+
+  private func apply(_ block: @escaping () -> Void) {
+    RunLoop.main.perform(block)
+  }
+  private func apply<V>(_ keyPath:
+                            ReferenceWritableKeyPath<BundleFeatureDetectionOperation, V>,
+                        _ value: V)
+  {
+    apply {
+      self[keyPath: keyPath] = value
+    }
+  }
+  private func applyState(_ state: State) { // Q: Any
+    apply(\.state, state)
+  }
+
+
+  // MARK: - Main Entry
+
+  private func startWork() { // Q: background
+
+    var isDir : ObjCBool = false
+    guard fm.fileExists(atPath: url.path, isDirectory: &isDir) else {
+      return applyState(.failedToOpen(nil))
+    }
+
+    if isDir.boolValue {
+      processWrapper(url)
+    }
+    else {
+      processFile(url)
+    }
+  }
+
+
+  // MARK: - Workers
+
+  private func processFile(_ url: URL) {
+    guard fm.isExecutableFile(atPath: url.path) else {
+      return applyState(.notAnApplication)
+    }
+
+    // TODO: grab Info.plist embedded in Mach-O
+
+    apply(\.info.executableURL, url)
+
+    processExecutable(url)
+
+    applyState(.finished)
+  }
+
+  /**
+   * Processes an app bundle (on a background queue).
+   *
+   * Steps
+   * 1. load and parse info dictionary
+   * 2. load image
+   * 3. run otool on the main executable and its dependencies
+   * 4. look for files in the bundle hierarchy
+   */
+  private func processWrapper(_ url: URL) { // Q: Any
+    guard let bundle = Bundle(url: url) else {
+      print("could not open bundle:", url)
+      return applyState(.failedToOpen(nil))
+    }
+
+    let info = InfoDict(bundle.infoDictionary ?? [:])
+
+    guard let executableURL = bundle.executableURL else {
+      print("no executable in bundle:", bundle)
+      return applyState(.notAnApplication)
+    }
+    let receiptURL = bundle.appStoreReceiptURL
+
+    apply {
+      self.info.executableURL  = executableURL
+      self.info.receiptURL     = receiptURL
+      self.info.infoDictionary = info
+    }
+
+    let image = loadImage(in: info, bundle: bundle)
+    apply(\.info.appImage, image)
+
+    processExecutable(executableURL)
+
+    processDirectoryContents(url)
+
+    if nesting < 2 {
+      processNestedApplications(ownExecutable: info.executable
+                                            ?? executableURL.lastPathComponent)
+    }
+
+    // DONE
+    self.applyState(.finished)
+  }
+
+
+  // MARK: - Individual Workers
+
+  private func processNestedApplications(ownExecutable: String) {
+    let contents = url.appendingPathComponent("Contents")
+
+    func scan(_ directory: URL) {
+      let apps = fm.ls(directory, suffix: ".app").lazy
+        .filter { $0 != ownExecutable }
+        .map    { directory.appendingPathComponent($0) }
+      for app in apps {
+        // We could actually async-nest the operations, but all things are
+        // currently synchronous anyways.
+        let op = BundleFeatureDetectionOperation(app, nesting: nesting + 1)
+        op.startWork() // same thread (vs resume), no delegate
+
+        if op.info.executableURL  != nil &&
+           op.info.infoDictionary != nil &&
+           !op.info.detectedTechnologies.isEmpty
+        {
+          apply {
+            self.info.embeddedExecutables.append(op.info)
+          }
+        }
+      }
+    }
+
+    scan(contents.appendingPathComponent("MacOS"))
+    scan(contents.appendingPathComponent("Frameworks"))
+  }
+
+  /// This runs objdump on the executable (w/ traversal of dependencies)
+  private func processExecutable(_ executableURL: URL) { // Q: Any
+    do {
+      let dependencies = try otool(executableURL)
+
+      // scan in this bg thread
+      var detectedFeatures = DetectedTechnologies()
+      detectedFeatures.scanDependencies(dependencies)
+
+      apply {
+        self.otoolAvailable = true
+        self.info.dependencies = dependencies
+        self.info.detectedTechnologies.formUnion(detectedFeatures)
+      }
+    }
+    catch {
+      print("Could not invoke OTool:", error)
+      apply(\.otoolAvailable, false)
+    }
+  }
+
+  /// Looks at the directory hierarchy of the bundle
+  private func processDirectoryContents(_ url: URL) { // Q: Any
+    var detectedFeatures = DetectedTechnologies()
+    let contents = url.appendingPathComponent("Contents")
+
+    // Charles & Eclipse
+    for pc in [ "Java", "Eclipse" ] {
+      let suburl = contents.appendingPathComponent(pc)
+      if fm.fileExists(atPath: suburl.path) {
+        detectedFeatures.insert(.java)
+        break
+      }
+    }
+
+    // JD-GUI
+    do {
+      if info.infoDictionary?.JavaX ?? false {
+        detectedFeatures.insert(.java)
+      }
+    }
+
+    do { // Electron apps seem to have this ...
+      let suburl = contents.appendingPathComponent("Resources/app.asar")
+      if fm.fileExists(atPath: suburl.path) {
+        detectedFeatures.insert(.electron)
+      }
+    }
+
+    // Check for AppleScript scripts contained (app or not)
+    do {
+      let suburl = contents.appendingPathComponent("Resources/Scripts")
+      if !fm.ls(suburl, suffix: ".scpt").isEmpty {
+        detectedFeatures.insert(.applescript)
+      }
+    }
+
+    // scan for Platypus
+    do {
+      let suburl1 =
+            contents.appendingPathComponent("Resources/AppSettings.plist")
+      let suburl2 = contents.appendingPathComponent("Resources/script")
+      if fm.fileExists(atPath: suburl1.path) &&
+         fm.fileExists(atPath: suburl2.path)
+      {
+        detectedFeatures.insert(.platypus)
+      }
+    }
+
+    // scan the Frameworks directory
+    do {
+      let suburl = contents.appendingPathComponent("Frameworks")
+      for filename in fm.ls(suburl) {
+        if filename.hasPrefix("libwx_") {
+          detectedFeatures.insert(.wxWidgets)
+        }
+        else if filename == "python-extensions" {
+          detectedFeatures.insert(.python)
+        }
+      }
+    }
+
+    if !detectedFeatures.isEmpty {
+      apply {
+        self.info.detectedTechnologies.formUnion(detectedFeatures)
+      }
+    }
+  }
+}
+
+fileprivate extension FileManager {
+
+  func ls(_ url: URL, suffix: String = "") -> [ String ] {
+    (try? contentsOfDirectory(at: url, includingPropertiesForKeys: nil,
+                              options: .skipsSubdirectoryDescendants)
+      .map    { $0.lastPathComponent }
+      .filter { $0.hasSuffix(suffix) }
+      .sorted()
+    ) ?? []
+  }
+}
+
+extension DetectedTechnologies {
+
+  mutating func scanDependencies(_ dependencies: [ String ]) {
+    for dep in dependencies {
+      func check(_ option: DetectedTechnologies, _ needle: String) -> Bool
+      {
+        guard !contains(option)    else { return false } // scanned already
+        guard dep.contains(needle) else { return false }
+        self.insert(option)
+        return true
+      }
+
+      if check(.electron,  "Electron")          { continue }
+      if check(.catalyst,  "UIKitMacHelper")    { continue }
+      if check(.appkit,    "AppKit.framework")  { continue }
+      if check(.swiftui,   "SwiftUI.framework") { continue }
+      if check(.uikit,     "UIKit.framework")   { continue }
+      if check(.qt,        "QtCore.framework")  { continue }
+      if check(.webkit,    "WebKit.framework")  { continue }
+
+      if check(.cplusplus, "libc++")            { continue }
+      if check(.objc,      "libobjc")           { continue }
+      if check(.swift,     "libswiftCore")      { continue }
+    }
+  }
+}

test-nate/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -0,0 +1,11 @@
+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

test-nate/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,58 @@
+{
+  "images" : [
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "16x16"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "16x16"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "32x32"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "32x32"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "128x128"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "128x128"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "256x256"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "256x256"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "512x512"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "512x512"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

test-nate/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

test-nate/ContentView.swift

@@ -0,0 +1,24 @@
+//
+//  ContentView.swift
+//  test-nate
+//
+//  Created by julien Lengrand-Lambert on 03/07/2024.
+//
+
+import SwiftUI
+
+struct ContentView: View {
+    var body: some View {
+        VStack {
+            Image(systemName: "globe")
+                .imageScale(.large)
+                .foregroundStyle(.tint)
+            Text("Hello, world!")
+        }
+        .padding()
+    }
+}
+
+#Preview {
+    ContentView()
+}

test-nate/Preview Content/Preview Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

test-nate/test_nate.entitlements

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.files.user-selected.read-only</key>
+	<true/>
+</dict>
+</plist>

test-nate/test_nateApp.swift

@@ -0,0 +1,17 @@
+//
+//  test_nateApp.swift
+//  test-nate
+//
+//  Created by julien Lengrand-Lambert on 03/07/2024.
+//
+
+import SwiftUI
+
+@main
+struct test_nateApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+}