Preserve line ending characters

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## TBD
 
 - Added support for converting projects within sln files on the command line
+- Preserve line ending characters
 
 ## v1.0.1104.33 (November 4<sup>th</sup>, 2024)
 

src/PackageReferenceVersionToAttribute/ProjectConverter.cs

@@ -146,11 +146,14 @@ private async Task ConvertAsync(string projectFilePath)
                 this.fileService.RemoveReadOnlyAttribute(projectFilePath);
             }
 
+            string detectedLineEnding = DetectLineEnding(projectFilePath);
+
             var settings = new XmlWriterSettings
             {
                 OmitXmlDeclaration = document.Declaration == null, // Preserve the XML declaration if it exists.
-                Indent = false,                                    // Prevents adding any extra indentation
-                NewLineHandling = NewLineHandling.Replace,
+                Indent = false,                                    // Prevents adding any extra indentation.
+                NewLineHandling = NewLineHandling.Replace,         // Preserve the same line endings.
+                NewLineChars = detectedLineEnding,                 // Preserve the same line endings.
             };
 
             if (this.options.DryRun)
@@ -169,5 +172,27 @@ private async Task ConvertAsync(string projectFilePath)
                 document.Save(writer); // Preserves original formatting, avoids extra lines
             }
         }
+
+        public static string DetectLineEnding(string filePath)
+        {
+            using var reader = new StreamReader(filePath);
+            int ch;
+            char previousChar = '\0';
+
+            while ((ch = reader.Read()) != -1)
+            {
+                char currentChar = (char)ch;
+
+                if (currentChar == '\n')
+                {
+                    return previousChar == '\r' ? "\r\n" : "\n";
+                }
+
+                previousChar = currentChar;
+            }
+
+            // Default to system line ending if no line ending found
+            return Environment.NewLine;
+        }
     }
 }

src/PackageReferenceVersionToAttributeExtensionTests/ConvertPackageReferenceVersionElementsToAttributesCommandTests.cs

@@ -161,8 +161,7 @@ public async Task ExecuteAsync_WithOneSelectedProject_SucceedsAsync()
             this.command.Invoke(null);
 
             // Assert
-            Assert.AreEqual(
-                """
+            string expectedContents = """
                 <Project Sdk="Microsoft.NET.Sdk">
                     <PropertyGroup>
                         <TargetFramework>net8.0</TargetFramework>
@@ -171,12 +170,13 @@ public async Task ExecuteAsync_WithOneSelectedProject_SucceedsAsync()
                         <PackageReference Include="PackageA" Version="1.2.3" />
                     </ItemGroup>
                 </Project>
-                """,
-                project.Contents);
+                """;
+            Assert.AreEqual(expectedContents, project.Contents);
 
             string backupFilePath = $"{project.Path}.bak";
             Assert.IsTrue(File.Exists(backupFilePath));
-            Assert.AreEqual(Contents, File.ReadAllText(backupFilePath));
+            string actualContents = File.ReadAllText(backupFilePath);
+            Assert.AreEqual(Contents, actualContents);
         }
 
         /// <summary>

src/PackageReferenceVersionToAttributeTool/ProgramCommand.cs

@@ -20,7 +20,7 @@ public ProgramCommand()
         {
             var inputsArgument = new Argument<string[]>(
                 name: "inputs",
-                description: "The project files or wildcard patterns to convert.")
+                description: "The file paths and patterns which match solution and project files to convert.")
             {
                 Arity = ArgumentArity.OneOrMore,
             };

src/PackageReferenceVersionToAttributeToolTests/HelpTests.cs

@@ -0,0 +1,37 @@
+// <copyright file="UsageTests.cs" company="Rami Abughazaleh">
+//   Copyright (c) Rami Abughazaleh. All rights reserved.
+// </copyright>
+
+namespace PackageReferenceVersionToAttributeToolTests
+{
+    using System.IO;
+    using Microsoft.VisualStudio.TestTools.UnitTesting;
+    using PackageReferenceVersionToAttributeTool;
+    using static PackageReferenceVersionToAttributeToolTests.ToolRunner.ToolRunner;
+
+    /// <summary>
+    /// Contains unit tests for verifying the expected behavior for the `--help` parameter of the tool.
+    /// </summary>
+    [TestClass]
+    public class HelpTests
+    {
+        /// <summary>
+        /// Verifies that a call to <see cref="Program.Main"/>
+        /// with the `--help` parameter,
+        /// returns a successful exit code and displays the command line usage on the console.
+        /// </summary>
+        /// <returns>A <see cref="Task"/> representing the asynchronous unit test.</returns>
+        [TestMethod]
+        public async Task Run_WithHelpParameter_DisplaysUsage()
+        {
+            // Act
+            var result = await RunToolAsync("--help");
+
+            // Assert
+            Assert.AreEqual(0, result.ExitCode, result.OutputAndError);
+
+            var expectedOutput = await File.ReadAllTextAsync("Usage.txt");
+            Assert.AreEqual(expectedOutput, result.Output.Trim(), result.OutputAndError);
+        }
+    }
+}

src/PackageReferenceVersionToAttributeToolTests/InputTests.cs

@@ -86,7 +86,7 @@ Converting PackageReference Version child elements to attributes in the project
                 result.OutputAndError);
             Assert.AreEqual(string.Empty, result.Error.Trim());
 
-            Assert.AreEqual(
+            string expectedContents =
                 """
                 <Project Sdk="Microsoft.NET.Sdk">
                     <PropertyGroup>
@@ -96,8 +96,9 @@ Converting PackageReference Version child elements to attributes in the project
                         <PackageReference Include="PackageA" Version="1.2.3" />
                     </ItemGroup>
                 </Project>
-                """,
-                projectA.ReadAllText());
+                """;
+            string actualContents = projectA.ReadAllText();
+            Assert.AreEqual(expectedContents, actualContents);
         }
 
         /// <summary>

src/PackageReferenceVersionToAttributeToolTests/Usage.txt

@@ -5,7 +5,7 @@ Usage:
   PackageReferenceVersionToAttributeTool <inputs>... [options]
 
 Arguments:
-  <inputs>  The project files or wildcard patterns to convert.
+  <inputs>  The file paths and patterns which match solution and project files to convert.
 
 Options:
   -b, --backup    Create a backup of the project files.