<refactor>

src/Trim/Main.cs

@@ -0,0 +1,53 @@
+using Dot.RmBlank;
+using NSExt.Extensions;
+
+namespace Dot.Trim;
+
+[Description(nameof(Str.RemoveTrailingWhiteSpaces))]
+[Localization(typeof(Str))]
+public sealed class Main : FilesTool<Option>
+{
+    private static int GetSpacesCnt(Stream fsr)
+    {
+        var trimLen = 0;
+        fsr.Seek(-1, SeekOrigin.End);
+        int data;
+        while ((data = fsr.ReadByte()) != -1)
+            if (new[] { 0x20, 0x0d, 0x0a }.Contains(data)) {
+                ++trimLen;
+                if (fsr.Position - 2 < 0) break;
+                fsr.Seek(-2, SeekOrigin.Current);
+            }
+            else {
+                break;
+            }
+
+        return trimLen;
+    }
+
+
+    protected override async ValueTask FileHandle(string file, CancellationToken _)
+    {
+        ShowMessage(1, 0, 0);
+        int spacesCnt;
+
+        await using var fsrw = OpenFileStream(file, FileMode.Open, FileAccess.ReadWrite);
+
+
+        if (fsrw is null || fsrw.Length == 0 || (spacesCnt = GetSpacesCnt(fsrw)) == 0) {
+            ShowMessage(0, 0, 1);
+            return;
+        }
+
+        fsrw.Seek(0, SeekOrigin.Begin);
+        if (!fsrw.IsTextStream()) {
+            ShowMessage(0, 0, 1);
+            return;
+        }
+
+
+        if (Opt.WriteMode) fsrw.SetLength(fsrw.Length - spacesCnt);
+        ShowMessage(0, 1, 0);
+        UpdateStats(Path.GetExtension(file));
+    }
+}

src/Trim/Option.cs

@@ -0,0 +1,3 @@
+namespace Dot.RmBlank;
+
+public class Option : DirOption { }