fix: 🐛 allow caching null values

src/NullableCache.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Runtime.Caching;
+
+namespace Flow.Launcher.Plugin.TogglTrack
+{
+	internal class NullableCache
+	{
+		private readonly static object NullObject = new object();
+		private readonly MemoryCache _cache = MemoryCache.Default;
+
+		internal bool Contains(string key)
+		{
+			return this._cache.Contains(key);
+		}
+
+		internal object? Get(string key)
+		{
+			var retrieved = this._cache.Get(key);
+
+			return (retrieved == NullableCache.NullObject)
+				? null
+				: retrieved;
+		}
+
+		internal void Set(string key, object? value, DateTimeOffset absoluteExpiration)
+		{
+			var set = (value is null)
+				? NullableCache.NullObject
+				: value;
+
+			this._cache.Set(key, set, absoluteExpiration);
+		}
+
+		internal object Remove(string key)
+		{
+			return this._cache.Remove(key);
+		}
+	}
+}

src/TogglTrack.cs

@@ -4,7 +4,6 @@
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
-using System.Runtime.Caching;
 using Humanizer;
 using TimeSpanParserUtil;
 using Flow.Launcher.Plugin.TogglTrack.TogglApi;
@@ -20,7 +19,7 @@ internal class TogglTrack
 		private (bool IsValid, string Token) _lastToken = (false, string.Empty);
 
 		private readonly (SemaphoreSlim Token, SemaphoreSlim Me, SemaphoreSlim RunningTimeEntries, SemaphoreSlim TimeEntries) _semaphores = (new SemaphoreSlim(1, 1), new SemaphoreSlim(1, 1), new SemaphoreSlim(1, 1), new SemaphoreSlim(1, 1));
-		private MemoryCache _cache = MemoryCache.Default;
+		private NullableCache _cache = new NullableCache();
 
 		private long? _selectedProjectId = -1;
 
@@ -59,9 +58,7 @@ internal TogglTrack(PluginInitContext context, Settings settings)
 
 				var me = await this._client.GetMe();
 
-				#pragma warning disable CS8604 // Possible null reference argument
 				this._cache.Set(cacheKey, me, DateTimeOffset.Now.AddDays(3));
-				#pragma warning restore CS8604 // Possible null reference argument
 
 				this._semaphores.Me.Release();
 				return me;
@@ -94,9 +91,7 @@ internal TogglTrack(PluginInitContext context, Settings settings)
 
 				var runningTimeEntry = await this._client.GetRunningTimeEntry();
 
-				#pragma warning disable CS8604 // Possible null reference argument
 				this._cache.Set(cacheKey, runningTimeEntry, DateTimeOffset.Now.AddSeconds(30));
-				#pragma warning restore CS8604 // Possible null reference argument
 
 				this._semaphores.RunningTimeEntries.Release();
 				return runningTimeEntry;
@@ -129,10 +124,7 @@ internal TogglTrack(PluginInitContext context, Settings settings)
 
 				var timeEntries = await this._client.GetTimeEntries();
 
-				#pragma warning disable CS8604 // Possible null reference argument
-				// TODO: value cannot be null
 				this._cache.Set(cacheKey, timeEntries, DateTimeOffset.Now.AddSeconds(30));
-				#pragma warning restore CS8604 // Possible null reference argument
 
 				this._semaphores.TimeEntries.Release();
 				return timeEntries;