Introduced UserOutputService for output with user settings

Gibbon.Git.Server.Tests/Services/UserOutputServiceTests.cs

@@ -0,0 +1,39 @@
+using Gibbon.Git.Server.Services;
+
+namespace Gibbon.Git.Server.Tests.Services;
+
+[TestClass]
+public class UserOutputServiceTests
+{
+    private IUserOutputService _userOutputService = null!;
+
+    [TestInitialize]
+    public void Init()
+    {
+        _userOutputService = new UserOutputService();
+    }
+
+    [DataTestMethod]
+    [DataRow(0, "0 B")]
+    [DataRow(2, "2 B")]
+    [DataRow(512, "512 B")]
+    [DataRow(100, "100 B")]
+    [DataRow(2000, "1,95 kB")]
+    [DataRow(1024, "1 kB")]
+    [DataRow(1500, "1,46 kB")]
+    [DataRow(2000000, "1,91 MB")]
+    [DataRow(1048576, "1 MB")]
+    [DataRow(2000000000, "1,86 GB")]
+    [DataRow(1073741824, "1 GB")]
+    [DataRow(2000000000000, "1,82 TB")]
+    [DataRow(2000000000000000, "1819 TB")]
+    [DataRow(-2000000, "1,91 MB")]
+    [DataRow(999, "999 B")]
+    [DataRow(10240, "10 kB")]
+    [DataRow(1023999, "1000 kB")]
+    [DataRow(1099511627776, "1 TB")]
+    public void TestGetFileSizeString(long size, string expected)
+    {
+        Assert.AreEqual(expected, _userOutputService.GetFileSizeString(size));
+    }
+}

Gibbon.Git.Server/Program.cs

@@ -103,6 +103,7 @@ DbContextOptionsBuilder ConfigureOptions(DbContextOptionsBuilder options)
 services.AddScoped<IRepositoryBrowserFactory, RepositoryBrowserFactory>();
 services.AddScoped<IAuthorizationHandler, RepositoryPermissionHandler>();
 
+services.AddScoped<IUserOutputService, UserOutputService>();
 services.AddTransient<IRepositoryBrowser, RepositoryBrowser>();
 
 services.AddTransient<IStartupService, RepositoryStartupService>();

Gibbon.Git.Server/Services/UserOutputService.cs

@@ -0,0 +1,42 @@
+namespace Gibbon.Git.Server.Services;
+
+public interface IUserOutputService
+{
+    /// <summary>
+    /// <para>Returns the human-readable file size for an arbitrary, 64-bit file size</para>
+    /// <para>The default format is "0.### XB", e.g. "4.2 KB" or "1.434 GB"</para>
+    /// </summary>
+    string GetFileSizeString(long size);
+}
+
+public class UserOutputService : IUserOutputService
+{
+    /// <summary>
+    /// <para>Returns the human-readable file size for an arbitrary, 64-bit file size</para>
+    /// <para>The default format is "0.### XB", e.g. "4.2 KB" or "1.434 GB"</para>
+    /// </summary>
+    public string GetFileSizeString(long size)
+    {
+        if (size == 0)
+        {
+            return "0 B";
+        }
+
+        string[] suffixes = ["B", "kB", "MB", "GB", "TB"];
+        var readable = Math.Abs((double)size);
+        var suffixIndex = 0;
+
+        while (readable >= 1024 && suffixIndex < suffixes.Length - 1)
+        {
+            readable /= 1024;
+            suffixIndex++;
+        }
+
+        return readable switch
+        {
+            >= 100 => $"{readable:0} {suffixes[suffixIndex]}",
+            > 10 => $"{readable:0.#} {suffixes[suffixIndex]}",
+            _ => $"{readable:0.##} {suffixes[suffixIndex]}"
+        };
+    }
+}