remove redundant datetime in async callback

Author: SimonCropp

src/DiffEngineTray.Tests/AsyncTimerTests.cs

@@ -6,7 +6,7 @@ public async Task It_calls_error_callback()
         var errorCallbackInvoked = new TaskCompletionSource<bool>();
 
         var timer = new AsyncTimer(
-            callback: (_, _) => throw new("Simulated!"),
+            callback: _ => throw new("Simulated!"),
             interval: TimeSpan.Zero,
             errorCallback: _ =>
             {
@@ -24,7 +24,7 @@ public async Task It_continues_to_run_after_an_error()
         var fail = true;
         var exceptionThrown = false;
         var timer = new AsyncTimer(
-            callback: (_, _) =>
+            callback: _ =>
             {
                 if (fail)
                 {
@@ -51,7 +51,7 @@ public async Task Stop_cancels_token_while_waiting()
         var waitCanceled = false;
         var delayStarted = new TaskCompletionSource<bool>();
         var timer = new AsyncTimer(
-            callback: (_, _) => throw new("Simulated!"),
+            callback: _ => throw new("Simulated!"),
             interval: TimeSpan.FromDays(7),
             delayStrategy: async (delayTime, token) =>
             {
@@ -79,7 +79,7 @@ public async Task Stop_cancels_token_while_in_callback()
         var callbackStarted = new TaskCompletionSource<bool>();
         var stopInitiated = new TaskCompletionSource<bool>();
         var timer = new AsyncTimer(
-            callback: async (_, token) =>
+            callback: async token =>
             {
                 callbackStarted.SetResult(true);
                 await stopInitiated.Task;
@@ -103,7 +103,7 @@ public async Task Stop_waits_for_callback_to_complete()
         var callbackCompleted = new TaskCompletionSource<bool>();
         var callbackTaskStarted = new TaskCompletionSource<bool>();
         var timer = new AsyncTimer(
-            callback: (_, _) =>
+            callback: _ =>
             {
                 callbackTaskStarted.SetResult(true);
                 return callbackCompleted.Task;

src/DiffEngineTray/AsyncTimer.cs

@@ -1,15 +1,15 @@
 class AsyncTimer :
     IAsyncDisposable
 {
-    Func<DateTime, CancellationToken, Task> callback;
+    Func<CancellationToken, Task> callback;
     TimeSpan interval;
     Action<Exception> errorCallback;
     Func<TimeSpan, CancellationToken, Task> delayStrategy;
     Task task;
     CancellationTokenSource tokenSource = new();
 
     public AsyncTimer(
-        Func<DateTime, CancellationToken, Task> callback,
+        Func<CancellationToken, Task> callback,
         TimeSpan interval,
         Action<Exception>? errorCallback = null,
         Func<TimeSpan, CancellationToken, Task>? delayStrategy = null)
@@ -36,9 +36,8 @@ async Task RunLoop(CancellationToken cancellation)
         {
             try
             {
-                var utcNow = DateTime.UtcNow;
                 await delayStrategy(interval, cancellation);
-                await callback(utcNow, cancellation);
+                await callback(cancellation);
             }
             catch (OperationCanceledException)
             {

src/DiffEngineTray/Tracker.cs

@@ -21,7 +21,7 @@ public Tracker(Action active, Action inactive)
             });
     }
 
-    Task ScanFiles(DateTime dateTime, CancellationToken cancellationToken)
+    Task ScanFiles(CancellationToken cancellationToken)
     {
         foreach (var delete in deletes.ToList()
                      .Where(delete => !File.Exists(delete.Value.File)))