Simplified process startup on macOS and Linux

Apple/Shared/Constants.swift

@@ -0,0 +1,22 @@
+@_implementationOnly import Constants
+
+public enum Constants {
+    enum Error: Swift.Error {
+        case invalidAppGroupIdentifier
+    }
+
+    public static let bundleIdentifier = AppBundleIdentifier
+    public static let appGroupIdentifier = AppGroupIdentifier
+
+    public static var groupContainerURL: URL {
+        get throws { try _groupContainerURL.get() }
+    }
+
+    private static let _groupContainerURL: Result<URL, Error> = {
+        guard let groupContainerURL = FileManager.default
+            .containerURL(forSecurityApplicationGroupIdentifier: appGroupIdentifier) else {
+            return .failure(.invalidAppGroupIdentifier)
+        }
+        return .success(groupContainerURL)
+    }()
+}

Apple/Shared/Constants/Constants.h

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+#import <Foundation/Foundation.h>
+
+#define MACRO_STRING_(m) #m
+#define MACRO_STRING(m) @MACRO_STRING_(m)
+
+NS_ASSUME_NONNULL_BEGIN
+
+static NSString * const AppBundleIdentifier = MACRO_STRING(APP_BUNDLE_IDENTIFIER);
+static NSString * const AppGroupIdentifier = MACRO_STRING(APP_GROUP_IDENTIFIER);
+
+NS_ASSUME_NONNULL_END

Apple/Shared/Constants/module.modulemap

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+module Constants {
+    header "Constants.h"
+    export *
+}

Apple/Shared/Logging.swift

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+import os
+@_exported import OSLog
+
+extension Logger {
+    private static let loggers: OSAllocatedUnfairLock<[String: Logger]> = OSAllocatedUnfairLock(initialState: [:])
+
+    public static let subsystem = Constants.bundleIdentifier
+
+    public static func logger(for type: Any.Type) -> Logger {
+        let category = String(describing: type)
+        let logger = loggers.withLock { loggers in
+            if let logger = loggers[category] { return logger }
+            let logger = Logger(subsystem: subsystem, category: category)
+            loggers[category] = logger
+            return logger
+        }
+        return logger
+    }
+}

Apple/Shared/Shared.xcconfig

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+PRODUCT_NAME = BurrowShared
+MERGEABLE_LIBRARY = YES
+
+SWIFT_INCLUDE_PATHS = $(PROJECT_DIR)/Shared/Constants
+GCC_PREPROCESSOR_DEFINITIONS = APP_BUNDLE_IDENTIFIER=$(APP_BUNDLE_IDENTIFIER) APP_GROUP_IDENTIFIER=$(APP_GROUP_IDENTIFIER)