refactor null checks using ArgumentException and ArgumentNullException

Simplify null and whitespace checks by using ArgumentException.ThrowIfNullOrWhiteSpace and ArgumentNullException.ThrowIfNull. This reduces repetitive code and enhances readability across various methods.

Author: arturcic

src/GitVersion.Core.Tests/Helpers/TestConsole.cs

@@ -1,3 +1,4 @@
+using GitVersion.Extensions;
 using GitVersion.Helpers;
 using GitVersion.Logging;
 
@@ -12,7 +13,7 @@ public class TestConsole(params string[] responses) : IConsole
 
     public void WriteLine() => this.log.Info(PathHelper.NewLine);
 
-    public void Write(string? msg) => this.log.Info(msg ?? throw new ArgumentNullException(nameof(msg)));
+    public void Write(string? msg) => this.log.Info(msg.NotNull());
 
     public string ReadLine() => this.responses.Dequeue();
 

src/GitVersion.Core/Core/FileSystem.cs

@@ -24,16 +24,14 @@ public void WriteAllText(string? file, string fileContents)
 
     public void WriteAllText(string? file, string fileContents, Encoding encoding)
     {
-        if (string.IsNullOrEmpty(file))
-            throw new ArgumentNullException(nameof(file));
+        ArgumentException.ThrowIfNullOrWhiteSpace(file);
 
         File.WriteAllText(file, fileContents, encoding);
     }
 
     public IEnumerable<string> DirectoryEnumerateFiles(string? directory, string searchPattern, SearchOption searchOption)
     {
-        if (string.IsNullOrEmpty(directory))
-            throw new ArgumentNullException(nameof(directory));
+        ArgumentException.ThrowIfNullOrWhiteSpace(directory);
 
         return Directory.EnumerateFiles(directory, searchPattern, searchOption);
     }

src/GitVersion.Core/Extensions/EnumerableExtensions.cs

@@ -4,12 +4,11 @@ public static class EnumerableExtensions
 {
     public static T? OnlyOrDefault<T>(this IEnumerable<T> source)
     {
-        switch (source)
+        ArgumentNullException.ThrowIfNull(source);
+
+        if (source is IList<T> { Count: 1 } list)
         {
-            case null:
-                throw new ArgumentNullException(nameof(source));
-            case IList<T> { Count: 1 } list:
-                return list[0];
+            return list[0];
         }
 
         using var e = source.GetEnumerator();
@@ -21,10 +20,7 @@ public static class EnumerableExtensions
 
     public static T SingleOfType<T>(this IEnumerable source)
     {
-        if (source == null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(source);
 
         return source.OfType<T>().Single();
     }

src/GitVersion.Core/Helpers/PathHelper.cs

@@ -35,8 +35,8 @@ public static string GetFullPath(string? path)
 
     public static string Combine(string? path1, string? path2)
     {
-        if (path1 == null || path2 == null)
-            throw new ArgumentNullException((path1 == null) ? nameof(path1) : nameof(path2));
+        ArgumentException.ThrowIfNullOrWhiteSpace(path1);
+        ArgumentException.ThrowIfNullOrWhiteSpace(path2);
 
         return Path.Combine(path1, path2);
     }
@@ -50,16 +50,19 @@ public static string Combine(string? path1)
 
     public static string Combine(string? path1, string? path2, string? path3)
     {
-        if (path1 == null || path2 == null || path3 == null)
-            throw new ArgumentNullException((path1 == null) ? nameof(path1) : (path2 == null) ? nameof(path2) : nameof(path3));
+        ArgumentException.ThrowIfNullOrWhiteSpace(path1);
+        ArgumentException.ThrowIfNullOrWhiteSpace(path2);
+        ArgumentException.ThrowIfNullOrWhiteSpace(path3);
 
         return Path.Combine(path1, path2, path3);
     }
 
     public static string Combine(string? path1, string? path2, string? path3, string? path4)
     {
-        if (path1 == null || path2 == null || path3 == null || path4 == null)
-            throw new ArgumentNullException((path1 == null) ? nameof(path1) : (path2 == null) ? nameof(path2) : (path3 == null) ? nameof(path3) : nameof(path4));
+        ArgumentException.ThrowIfNullOrWhiteSpace(path1);
+        ArgumentException.ThrowIfNullOrWhiteSpace(path2);
+        ArgumentException.ThrowIfNullOrWhiteSpace(path3);
+        ArgumentException.ThrowIfNullOrWhiteSpace(path4);
 
         return Path.Combine(path1, path2, path3, path4);
     }

src/GitVersion.Core/Helpers/StringFormatWith.cs

@@ -30,15 +30,8 @@ internal static class StringFormatWithExtension
     /// </example>
     public static string FormatWith<T>(this string template, T? source, IEnvironment environment)
     {
-        if (template is null)
-        {
-            throw new ArgumentNullException(nameof(template));
-        }
-
-        if (source is null)
-        {
-            throw new ArgumentNullException(nameof(source));
-        }
+        ArgumentNullException.ThrowIfNull(template);
+        ArgumentNullException.ThrowIfNull(source);
 
         foreach (Match match in RegexPatterns.Common.ExpandTokensRegex.Matches(template).Cast<Match>())
         {

src/GitVersion.Core/Logging/LogExtensions.cs

@@ -96,10 +96,7 @@ private static void Write(this ILog log, LogLevel level, LogAction? logAction)
 
     private static IDisposable WithVerbosity(this ILog log, Verbosity verbosity)
     {
-        if (log == null)
-        {
-            throw new ArgumentNullException(nameof(log));
-        }
+        ArgumentNullException.ThrowIfNull(log);
         var lastVerbosity = log.Verbosity;
         log.Verbosity = verbosity;
         return Disposable.Create(() => log.Verbosity = lastVerbosity);

src/GitVersion.Output/TemplateManager.cs

@@ -15,10 +15,7 @@ internal class TemplateManager(TemplateType templateType)
 
     public string? GetTemplateFor(string fileExtension)
     {
-        if (fileExtension == null)
-        {
-            throw new ArgumentNullException(nameof(fileExtension));
-        }
+        ArgumentNullException.ThrowIfNull(fileExtension);
 
         string? result = null;
 
@@ -32,10 +29,7 @@ internal class TemplateManager(TemplateType templateType)
 
     public string? GetAddFormatFor(string fileExtension)
     {
-        if (fileExtension == null)
-        {
-            throw new ArgumentNullException(nameof(fileExtension));
-        }
+        ArgumentNullException.ThrowIfNull(fileExtension);
 
         string? result = null;
 
@@ -49,10 +43,7 @@ internal class TemplateManager(TemplateType templateType)
 
     public bool IsSupported(string fileExtension)
     {
-        if (fileExtension == null)
-        {
-            throw new ArgumentNullException(nameof(fileExtension));
-        }
+        ArgumentNullException.ThrowIfNull(fileExtension);
 
         return this.templates.ContainsKey(fileExtension);
     }

src/GitVersion.Testing/Fixtures/RepositoryFixtureBase.cs

@@ -1,6 +1,7 @@
 using GitVersion.Helpers;
 using GitVersion.Testing.Internal;
 using LibGit2Sharp;
+using Shouldly;
 
 namespace GitVersion.Testing;
 
@@ -17,7 +18,7 @@ protected RepositoryFixtureBase(Func<string, Repository> repositoryBuilder)
     protected RepositoryFixtureBase(Repository repository)
     {
         SequenceDiagram = new();
-        Repository = repository ?? throw new ArgumentNullException(nameof(repository));
+        Repository = repository.ShouldNotBeNull();
         Repository.Config.Set("user.name", "Test");
         Repository.Config.Set("user.email", "test@email.com");
     }

src/GitVersion.Testing/Helpers/ProcessHelper.cs

@@ -76,10 +76,8 @@ public static class ProcessHelper
     // http://csharptest.net/532/using-processstart-to-capture-console-output/
     public static int Run(Action<string> output, Action<string> errorOutput, TextReader? input, string exe, string args, string workingDirectory, params KeyValuePair<string, string?>[] environmentalVariables)
     {
-        if (string.IsNullOrEmpty(exe))
-            throw new ArgumentNullException(nameof(exe));
-        if (output == null)
-            throw new ArgumentNullException(nameof(output));
+        ArgumentException.ThrowIfNullOrWhiteSpace(exe);
+        ArgumentNullException.ThrowIfNull(output);
 
         var psi = new ProcessStartInfo
         {