Templates working

WGneu/Utils.cs

@@ -6,9 +6,10 @@ using System.Threading.Tasks;
 using System.Windows.Media;
 using System.Windows;
 using System.Windows.Controls;
+using System.IO;
 
 namespace WGneu {
-    class Utils {
+    public static class Utils {
         public static void SetInputChanged(Control input) {
             input.BorderBrush = Brushes.Orange;
         }
@@ -44,5 +45,46 @@ namespace WGneu {
                 throw new ArgumentException("First argument has to be a decimal string");
             return a.Select(ch => ch - '0').Aggregate((sum, n) => (sum * 10 + n) % b);
         }
+
+        public sealed class TemporaryFile : IDisposable {
+            private int Usages = 0;
+            public string FilePath { get; private set; }
+
+            public TemporaryFile() : this("") {}
+
+            public TemporaryFile(string ext) : this(Path.GetTempPath(), ext) {}
+
+            public TemporaryFile(string dir, string ext) {
+                FilePath = Path.Combine(dir, Path.GetRandomFileName() + ext);
+                Usages++;
+                Create();
+            }
+
+            ~TemporaryFile() {
+                Delete();
+            }
+
+            public void Dispose() {
+                if (--Usages == 0) {
+                    Delete();
+                    GC.SuppressFinalize(this);
+                }
+            }
+
+            public TemporaryFile NewReference() {
+                Usages++;
+                return this;
+            }
+
+            private void Create() {
+                using (File.Create(FilePath)) {};
+            }
+
+            private void Delete() {
+                if (FilePath == null) return;
+                File.Delete(FilePath);
+                FilePath = null;
+            }
+        }
     }
 }