Add various default global options to reduce repetitive code

Sources/TelemetryDeck/Helpers/DictionaryExt.swift

@@ -0,0 +1,27 @@
+import Foundation
+
+// Source: https://github.com/FlineDev/HandySwift/blob/main/Sources/HandySwift/Extensions/DictionaryExt.swift
+
+extension Dictionary {
+    /// Transforms the keys of the dictionary using the given closure, returning a new dictionary with the transformed keys.
+    ///
+    /// - Parameter transform: A closure that takes a key from the dictionary as its argument and returns a new key.
+    /// - Returns: A dictionary with keys transformed by the `transform` closure and the same values as the original dictionary.
+    /// - Throws: Rethrows any error thrown by the `transform` closure.
+    ///
+    /// - Warning: If the `transform` closure produces duplicate keys, the values of earlier keys will be overridden by the values of later keys in the resulting dictionary.
+    ///
+    /// - Example:
+    /// ```
+    /// let originalDict = ["one": 1, "two": 2, "three": 3]
+    /// let transformedDict = originalDict.mapKeys { $0.uppercased() }
+    /// // transformedDict will be ["ONE": 1, "TWO": 2, "THREE": 3]
+    /// ```
+    func mapKeys<K: Hashable>(_ transform: (Key) throws -> K) rethrows -> [K: Value] {
+        var transformedDict: [K: Value] = [:]
+        for (key, value) in self {
+            transformedDict[try transform(key)] = value
+        }
+        return transformedDict
+    }
+}

Sources/TelemetryDeck/TelemetryClient.swift

@@ -41,6 +41,20 @@ public struct TelemetryManagerConfiguration: Sendable {
     /// Instead it is used to create a hash, which is included in your signal to allow you to count distinct users.
     public var defaultUser: String?
 
+    /// Specify this if you want us to prefix all your signals with a specific text.
+    /// For example, if you are already adding `AppName.` in front of every signal, just specify it here and no need to repeat over and over again.
+    public var defaultSignalPrefix: String?
+
+    /// Specify this if you want us to prefix all your signal parameters with a specific text.
+    /// For example, if you are already adding `AppName.` in front of every parameter name, just specify it here and no need to repeat over and over again.
+    public var defaultParameterPrefix: String?
+
+    /// Specify this if you want to attach some parameters globally to all signals you're sending.
+    /// For example, this could be useful to report your users' paid status or their user preferences to be able to filter by these fields in various insights.
+    ///
+    /// - NOTE: If you are using ``defaultParameterPrefix``, note that it applies even here, so no need to add your prefix in all the default parameters.
+    public var defaultParameters: @Sendable () -> [String: String] = { [:] }
+
     /// If `true`, sends a "newSessionBegan" Signal on each app foreground or cold launch
     ///
     /// Defaults to true. Set to false to prevent automatically sending this signal.

Sources/TelemetryDeck/TelemetryDeck.swift

@@ -36,9 +36,14 @@ public enum TelemetryDeck {
         // make sure to not send any signals when run by Xcode via SwiftUI previews
         guard !configuration.swiftUIPreviewMode, !configuration.analyticsDisabled else { return }
 
+        let combinedSignalName = (configuration.defaultSignalPrefix ?? "") + signalName
+        let combinedParameters = configuration.defaultParameters()
+            .merging(parameters) { $1 }
+            .mapKeys { (configuration.defaultParameterPrefix ?? "") + $0 }
+
         manager.signalManager.processSignal(
-            signalName,
-            parameters: parameters,
+            combinedSignalName,
+            parameters: combinedParameters,
             floatValue: floatValue,
             customUserID: customUserID,
             configuration: configuration