cleanup

src/DiffEngine/Inline/RuntimeMoniker.cs

@@ -27,6 +27,7 @@ static class RuntimeMoniker
             return null;
         }
 
+        // ReSharper disable once RedundantSuppressNullableWarningExpression
         var parts = frameworkName!.Split(',');
         var identifier = parts[0].Trim();
         string? versionText = null;
@@ -35,7 +36,7 @@ static class RuntimeMoniker
             var part = parts[index].Trim();
             if (part.StartsWith("Version=v", StringComparison.Ordinal))
             {
-                versionText = part.Substring("Version=v".Length);
+                versionText = part["Version=v".Length..];
                 break;
             }
         }
@@ -52,6 +53,7 @@ static class RuntimeMoniker
             ".NETCoreApp" when version.Major >= 5 => $"net{version.Major}.{minor}",
             ".NETCoreApp" => $"netcoreapp{version.Major}.{minor}",
             // "4.6.2" reads as net462, matching how TFMs are written.
+            // ReSharper disable once RedundantSuppressNullableWarningExpression
             ".NETFramework" => "net" + versionText!.Replace(".", ""),
             ".NETStandard" => $"netstandard{version.Major}.{minor}",
             _ => null

src/DiffEngine/Viewer/ImageExtensions.cs

@@ -26,7 +26,7 @@ static class ImageExtensions
         ".webp"
     ];
 
-    static readonly HashSet<string> lookup = new(All, StringComparer.OrdinalIgnoreCase);
+    static readonly HashSet<string> lookup = [with(All, StringComparer.OrdinalIgnoreCase)];
 
     public static bool Is(string path) =>
         lookup.Contains(Path.GetExtension(path));

src/DiffEngineTray.Tests/TrackerTrackedFilesTest.cs

@@ -66,13 +66,13 @@ public async Task AcceptingATrackedMoveMovesTheFile()
     {
         await using var tracker = new RecordingTracker();
         ITrackedFiles tracked = tracker;
-        File.WriteAllText(temp, "content");
+        await File.WriteAllTextAsync(temp, "content");
         tracker.AddMove(temp, target, null, null, false, null);
 
         var (ok, _) = tracked.Accept(TrackedKeys.ForMove(temp));
 
         await Assert.That(ok).IsTrue();
-        await Assert.That(File.ReadAllText(target)).IsEqualTo("content");
+        await Assert.That(await File.ReadAllTextAsync(target)).IsEqualTo("content");
         await Assert.That(tracker.Moves).IsEmpty();
     }
 
@@ -86,7 +86,7 @@ public async Task ALockedMoveIsRefusedWithoutPrompting()
         await using var tracker = new RecordingTracker(
             lockedFilesResolver: (_, _) => throw new("must not prompt"));
         ITrackedFiles tracked = tracker;
-        File.WriteAllText(temp, "content");
+        await File.WriteAllTextAsync(temp, "content");
         tracker.AddMove(temp, target, null, null, false, null);
         using (new FileStream(target, FileMode.Create, FileAccess.ReadWrite, FileShare.None))
         {
@@ -115,15 +115,15 @@ public async Task AcceptAllSweepsAndCountsWhatStayed()
         await using var tracker = new RecordingTracker();
         ITrackedFiles tracked = tracker;
         tracker.AddDelete(file);
-        File.WriteAllText(temp, "content");
+        await File.WriteAllTextAsync(temp, "content");
         tracker.AddMove(temp, target, null, null, false, null);
 
         var (accepted, kept) = tracked.AcceptAll();
 
         await Assert.That(accepted).IsEqualTo(2);
         await Assert.That(kept).IsEqualTo(0);
         await Assert.That(File.Exists(file)).IsFalse();
-        await Assert.That(File.ReadAllText(target)).IsEqualTo("content");
+        await Assert.That(await File.ReadAllTextAsync(target)).IsEqualTo("content");
     }
 
     [Test]
@@ -132,7 +132,7 @@ public async Task DiscardAllUntracksDeletesAndDropsMoveTemps()
         await using var tracker = new RecordingTracker();
         ITrackedFiles tracked = tracker;
         tracker.AddDelete(file);
-        File.WriteAllText(temp, "content");
+        await File.WriteAllTextAsync(temp, "content");
         tracker.AddMove(temp, target, null, null, false, null);
 
         var count = tracked.DiscardAll();

src/DiffEngineTray.Tests/TrayViewerSyncTest.cs

@@ -1,7 +1,5 @@
 extern alias viewer;
 
-using System.Collections.Concurrent;
-
 // The viewer's own copies of the protocol types. DiffEngineViewer links DiffEngine's Inline and
 // Protocol sources rather than referencing them, so the same names exist in both assemblies and
 // only the alias tells them apart. That duplication is the point of these tests: the two halves
@@ -130,7 +128,7 @@ public async Task TrayAcceptOfATrackedMoveReachesTheAttachedViewer()
         pair.Tracker.Accept(pair.Tracker.Moves.Single());
 
         await Assert.That(pair.Pump().Keys()).IsEquivalentTo([Key(sample, 1)]);
-        await Assert.That(File.ReadAllText(move.Target)).IsEqualTo("received");
+        await Assert.That(await File.ReadAllTextAsync(move.Target)).IsEqualTo("received");
     }
 
     [Test]
@@ -186,7 +184,7 @@ public async Task ViewerAcceptAllEmptiesTheTray()
         await Assert.That(pair.Tracker.Snapshots).IsEmpty();
         await Assert.That(pair.Tracker.Moves).IsEmpty();
         await Assert.That(pair.Tracker.Deletes).IsEmpty();
-        await Assert.That(File.ReadAllText(move.Target)).IsEqualTo("received");
+        await Assert.That(await File.ReadAllTextAsync(move.Target)).IsEqualTo("received");
         await Assert.That(File.Exists(delete.File)).IsFalse();
     }
 
@@ -250,7 +248,7 @@ public async Task ViewerAcceptOfATrackedMoveReachesTheTray()
 
         await Assert.That(pair.Pump().Keys()).IsEquivalentTo([Key(sample, 1)]);
         await Assert.That(pair.Tracker.Moves).IsEmpty();
-        await Assert.That(File.ReadAllText(move.Target)).IsEqualTo("received");
+        await Assert.That(await File.ReadAllTextAsync(move.Target)).IsEqualTo("received");
     }
 
     /// <summary>
@@ -493,7 +491,7 @@ public async Task ADeleteWithNoTrayReachesTheViewerAndTheFileGoes()
         using var noTray = new NoTray();
         var file = pair.StageStaleFile();
 
-        DiffRunner.AddDelete(file);
+        await DiffRunner.AddDeleteAsync(file);
 
         await Assert.That(pair.Viewer.Keys()).IsEquivalentTo([TrackedKeys.ForDelete(file)]);
 
@@ -535,7 +533,7 @@ public async Task AMoveWithNoTrayReachesTheViewerAndTheFileMoves()
 
         pair.Act(CommandKind.Accept, move.Key);
 
-        await Assert.That(File.ReadAllText(move.Target)).IsEqualTo("received");
+        await Assert.That(await File.ReadAllTextAsync(move.Target)).IsEqualTo("received");
         await Assert.That(File.Exists(move.Temp)).IsFalse();
     }
 
@@ -564,7 +562,7 @@ public async Task AResentMoveReplacesItsEntry()
         var move = pair.StageMove();
         PendingFiles.AddMove(move.Temp, move.Target, null, null, false, null);
 
-        File.WriteAllText(move.Temp, "second run");
+        await File.WriteAllTextAsync(move.Temp, "second run");
         PendingFiles.AddMove(move.Temp, move.Target, null, null, false, null);
 
         await Assert.That(pair.Viewer.Queue).HasSingleItem();
@@ -581,7 +579,7 @@ public async Task AFullListingCarriesTheViewersOwnPendingFiles()
         await using var pair = new ViewerOwned();
         using var noTray = new NoTray();
         var file = pair.StageStaleFile();
-        DiffRunner.AddDelete(file);
+        await DiffRunner.AddDeleteAsync(file);
 
         var full = pair.Send(new(ViewerVerb.ListFull));
         var plain = pair.Send(new(ViewerVerb.List));
@@ -801,7 +799,7 @@ public ViewerOwned(Func<ViewerSidePatch, ViewerSideApplyResult>? applier = null)
             previousPort = Environment.GetEnvironmentVariable(ViewerClient.PortVariable);
             Environment.SetEnvironmentVariable(ViewerClient.PortVariable, server.Port.ToString());
             Window = new(SessionState.Start(ViewerMode.Inline));
-            actions = new ViewerActions(
+            actions = new(
                 patch =>
                 {
                     Applied.Add(patch);

src/DiffEngineViewer.Tests/AttachedViewerTests.cs

@@ -221,8 +221,8 @@ public async Task MoveAndDeleteLinesMaterialize()
     {
         var temp = Path.Combine(Path.GetTempPath(), $"deview_{Guid.NewGuid():N}.received.txt");
         var target = Path.Combine(Path.GetTempPath(), $"deview_{Guid.NewGuid():N}.verified.txt");
-        File.WriteAllText(temp, "incoming");
-        File.WriteAllText(target, "committed");
+        await File.WriteAllTextAsync(temp, "incoming");
+        await File.WriteAllTextAsync(target, "committed");
         try
         {
             var (server, cancel) = Listing(() => ViewerResponse.Listing(
@@ -260,7 +260,7 @@ public async Task MoveAndDeleteLinesMaterialize()
     public async Task AnUnreadableFileDegradesNotCrashes()
     {
         var file = Path.Combine(Path.GetTempPath(), $"deview_{Guid.NewGuid():N}.verified.txt");
-        File.WriteAllText(file, "locked away");
+        await File.WriteAllTextAsync(file, "locked away");
         try
         {
             using var holder = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.None);
@@ -294,7 +294,7 @@ public async Task AnUnreadableFileDegradesNotCrashes()
     public async Task UnchangedFilesAreNotReReadAndAChangeRefreshes()
     {
         var file = Path.Combine(Path.GetTempPath(), $"deview_{Guid.NewGuid():N}.verified.txt");
-        File.WriteAllText(file, "first");
+        await File.WriteAllTextAsync(file, "first");
         try
         {
             var (server, cancel) = Listing(() => ViewerResponse.Listing(
@@ -312,7 +312,7 @@ public async Task UnchangedFilesAreNotReReadAndAChangeRefreshes()
                 await Assert.That(host.State.Queue.Single()).IsSameReferenceAs(first);
 
                 // A stamp needs a distinct write time; length changing makes it deterministic.
-                File.WriteAllText(file, "second, longer");
+                await File.WriteAllTextAsync(file, "second, longer");
                 link.Pump();
                 await Assert.That(host.State.Queue.Single().RightText).IsEqualTo("second, longer");
                 await cancel.CancelAsync();

src/DiffEngineViewer.Tests/GlobalUsings.cs

@@ -1 +1,3 @@
 global using System.Text.RegularExpressions;
+global using System.Buffers.Binary;
+global using System.IO.Compression;

src/DiffEngineViewer.Tests/ImageHeaderTests.cs

@@ -1,5 +1,3 @@
-using System.Buffers.Binary;
-
 /// <summary>
 /// What the sniffer makes of each format's leading bytes.
 /// <para>

src/DiffEngineViewer.Tests/ImageScreenTests.cs

@@ -99,8 +99,8 @@ public Task DeleteInQueue() =>
     public async Task PanesCarryThePicture()
     {
         var screen = ScreenBuilder.Build(State(Received(), Expected()));
-        await Assert.That(screen.Left.Image).IsEqualTo(new ImagePane("temp/sample.received.png", 800, 600));
-        await Assert.That(screen.Right.Image).IsEqualTo(new ImagePane("code/sample.verified.png", 800, 600));
+        await Assert.That(screen.Left.Image).IsEqualTo(new("temp/sample.received.png", 800, 600));
+        await Assert.That(screen.Right.Image).IsEqualTo(new("code/sample.verified.png", 800, 600));
     }
 
     [Test]

src/DiffEngineViewer.Tests/SamplePng.cs

@@ -1,7 +1,3 @@
-using System.Buffers.Binary;
-using System.IO.Compression;
-using System.Text;
-
 /// <summary>
 /// A real, decodable PNG built byte by byte.
 /// <para>

src/DiffEngineViewer.Tests/ViewerLaunchTests.cs

@@ -326,7 +326,7 @@ public async Task GroupedQueue()
                 "Accepting the conflicted entry writes the variant on screen",
                 "Accept all skips the conflict and says 1 conflict needs review");
 
-            foreach (var patch in new engine::DiffEngine.InlinePatch[]
+            foreach (var patch in new[]
                      {
                          new(grouped, 6, "\"old value\"", "first new")
                          {

src/DiffEngineViewer.Windows.Tests/GlobalUsings.cs

@@ -0,0 +1,2 @@
+global using System.Buffers.Binary;
+global using System.IO.Compression;

src/DiffEngineViewer.Windows.Tests/ImageCacheTests.cs

@@ -50,7 +50,7 @@ public async Task RedecodesWhenTheFileChanges()
 
         // A different size, so the change is visible whatever the file system's timestamp
         // resolution turns out to be.
-        File.WriteAllBytes(path, SamplePng.Build(4, 4, 40, 200, 40));
+        await File.WriteAllBytesAsync(path, SamplePng.Build(4, 4, 40, 200, 40));
         await Assert.That(cache.Get(path)!.Width).IsEqualTo(4);
     }
 

src/DiffEngineViewer/Images/ImageHeader.cs

@@ -83,8 +83,7 @@ static bool TryJpeg(ReadOnlySpan<byte> bytes, out ImageHeader header)
                 continue;
             }
 
-            if (marker == 0x01 ||
-                marker is >= 0xD0 and <= 0xD9)
+            if (marker is 0x01 or >= 0xD0 and <= 0xD9)
             {
                 continue;
             }

src/DiffEngineViewer/Images/ImageRows.cs

@@ -59,7 +59,7 @@ static Row Cell(int number, string label, string? value, string? other, RowKind
             kind = value == other ? RowKind.Unchanged : RowKind.Modified;
         }
 
-        return new(number, kind, $"{label.PadRight(labelWidth)}{value}");
+        return new(number, kind, $"{label,-labelWidth}{value}");
     }
 
     static string? Format(ImageFile? image)

src/DiffEngineViewer/RevealFile.cs

@@ -1,5 +1,3 @@
-using System.Diagnostics;
-
 /// <summary>
 /// Shows a file in the platform's file manager. Best effort: revealing is a convenience beside
 /// the review, so a missing file manager or a deleted file degrades to nothing rather than an

src/DiffEngineViewer/ViewerProgram.cs

@@ -314,8 +314,7 @@ static SessionState Apply(SessionState state, ViewerInput input, OwnerLink? link
         // resolve which item was chosen, so clearing first would swallow the command. And not when
         // a right-click opened another menu in the same frame, which is the dismissal's successor
         // rather than something to undo.
-        if (input.MenuClosed &&
-            input.RightClickedQueueItem < 0 &&
+        if (input is {MenuClosed: true, RightClickedQueueItem: < 0} &&
             state.Menu is not null)
         {
             state = state with { Menu = null };