Add ProcessUtils helper and output models for Apple CLI APIs

.github/CSharpExpert.agent.md

@@ -14,7 +14,7 @@ secure, readable, and maintainable code that follows .NET conventions and existi
 - **C# Version**: `latest` (per project files)
 - **Nullable**: Enabled
 - **Purpose**: Apple SDK discovery, provisioning profiles, plist parsing, Xcode integration
-- **Tests**: NUnit (UnitTests project)
+- **Tests**: NUnit (tests project)
 
 When invoked:
 
@@ -49,7 +49,7 @@ When invoked:
 ## Build and Test
 
 - Build: `dotnet build Xamarin.MacDev.sln`
-- Tests: `dotnet test UnitTests/UnitTests.csproj`
+- Tests: `dotnet test tests/tests.csproj`
 - Pack: `dotnet pack Xamarin.MacDev/Xamarin.MacDev.csproj`
 
 ## Async Best Practices

.github/copilot-instructions.md

@@ -14,7 +14,7 @@ provisioning, plist parsing, and related developer utilities.
 - C# Language Version: `latest` (per project files)
 - Nullable reference types are enabled
 - SDK-style projects built with `dotnet build` (or `make`)
-- Tests: `UnitTests` project using **NUnit**
+- Tests: `tests` project using **NUnit**
 
 ## Guidance
 
@@ -23,10 +23,32 @@ provisioning, plist parsing, and related developer utilities.
 - Avoid APIs that are unavailable in `netstandard2.0` when used in shared code.
 - Do not edit auto-generated files (`// <auto-generated>` or `*.g.cs`).
 
+## Code Style
+
+- Use tabs for indentation (size 4).
+- Use `namespace Xamarin.MacDev {` (brace on same line) with a **blank line after the opening brace**.
+- One class per file.
+- Keep classes under ~700 lines; extract helpers/parsers into separate files when needed.
+- Private/internal fields: `camelCase`. Types/methods/properties: `PascalCase`.
+- Space before method call parentheses: `Method ()`, not `Method()`.
+- License header on new files: `// Copyright (c) Microsoft Corporation.` / `// Licensed under the MIT License.`
+- Add `#nullable enable` at the top of new files.
+
 ## Error Handling
 
 - Validate inputs at public boundaries using `ArgumentNullException.ThrowIfNull` and `string.IsNullOrWhiteSpace`.
 - Use precise exception types and avoid catch-and-swallow patterns.
+- Catch specific exceptions (`catch (UnauthorizedAccessException)`) — never bare `catch (Exception)`.
+
+## Resource Management
+
+- Use `using` on **all** disposables — including `StringWriter`, `Process`, `StreamReader`, etc.
+- Prefer the Null Object Pattern (e.g. `static readonly NullProgress`) over null-checking everywhere.
+
+## .NET SDK Patterns
+
+- Prefer `Path.GetRandomFileName()` for temp file names.
+- Use `File.Create(path, bufferSize, FileOptions.DeleteOnClose)` when appropriate for transient files.
 
 ## Documentation
 
@@ -35,3 +57,4 @@ provisioning, plist parsing, and related developer utilities.
 ## Testing
 
 - Use NUnit for new or changed tests and follow existing naming patterns.
+- Every new utility method **must** have test coverage — no exceptions.

.github/workflows/ci.yml

@@ -44,11 +44,11 @@ jobs:
 
     - name: Test (Windows)
       if: runner.os == 'Windows'
-      run: dotnet test UnitTests/UnitTests.csproj -c Release -l "console;verbosity=detailed" -l trx --results-directory ${{ github.workspace }}/artifacts/test-results
+      run: dotnet test tests/tests.csproj -c Release -l "console;verbosity=detailed" -l trx --results-directory ${{ github.workspace }}/artifacts/test-results
 
     - name: Test (macOS)
       if: runner.os == 'macOS'
-      run: dotnet test UnitTests/UnitTests.csproj -c Release -f net10.0 -l "console;verbosity=detailed" -l trx --results-directory ${{ github.workspace }}/artifacts/test-results
+      run: dotnet test tests/tests.csproj -c Release -f net10.0 -l "console;verbosity=detailed" -l trx --results-directory ${{ github.workspace }}/artifacts/test-results
 
     - name: Calculate Version
       shell: bash

Xamarin.MacDev.sln

@@ -3,7 +3,7 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 2012
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Xamarin.MacDev", "Xamarin.MacDev\Xamarin.MacDev.csproj", "{CC3D9353-20C4-467A-8522-A9DED6F0C753}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "UnitTests", "UnitTests\UnitTests.csproj", "{39DBAAF8-57A5-49A3-9E9A-11B545906AED}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "tests", "tests\tests.csproj", "{39DBAAF8-57A5-49A3-9E9A-11B545906AED}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution

Xamarin.MacDev/Models/CommandLineToolsInfo.cs

@@ -0,0 +1,23 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+#nullable enable
+
+namespace Xamarin.MacDev.Models {
+
+	/// <summary>
+	/// Information about Xcode Command Line Tools installation.
+	/// </summary>
+	public class CommandLineToolsInfo {
+		/// <summary>Whether the Command Line Tools are installed.</summary>
+		public bool IsInstalled { get; set; }
+
+		/// <summary>The Command Line Tools version string (e.g. "16.2.0.0.1.1733547573"), or null if not installed.</summary>
+		public string? Version { get; set; }
+
+		/// <summary>The Command Line Tools install path (e.g. "/Library/Developer/CommandLineTools"), or null if not installed.</summary>
+		public string? Path { get; set; }
+
+		public override string ToString () => IsInstalled ? $"Command Line Tools {Version} at {Path}" : "Command Line Tools not installed";
+	}
+}

Xamarin.MacDev/Models/EnvironmentCheckResult.cs

@@ -0,0 +1,59 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+using System.Collections.Generic;
+
+#nullable enable
+
+namespace Xamarin.MacDev.Models {
+
+	/// <summary>
+	/// Overall status of the Apple development environment.
+	/// </summary>
+	public enum EnvironmentStatus {
+		/// <summary>All required components are present.</summary>
+		Ok,
+		/// <summary>Some optional components are missing.</summary>
+		Partial,
+		/// <summary>Required components are missing.</summary>
+		Missing,
+	}
+
+	/// <summary>
+	/// Result of a comprehensive Apple environment check.
+	/// </summary>
+	public class EnvironmentCheckResult {
+		/// <summary>Information about the active Xcode installation, or null if none found.</summary>
+		public XcodeInfo? Xcode { get; set; }
+
+		/// <summary>Information about the Command Line Tools.</summary>
+		public CommandLineToolsInfo CommandLineTools { get; set; } = new CommandLineToolsInfo ();
+
+		/// <summary>Installed simulator runtimes.</summary>
+		public List<SimulatorRuntimeInfo> Runtimes { get; set; } = new List<SimulatorRuntimeInfo> ();
+
+		/// <summary>Enabled development platforms (e.g. "iOS", "macOS").</summary>
+		public List<string> Platforms { get; set; } = new List<string> ();
+
+		/// <summary>Overall environment status.</summary>
+		public EnvironmentStatus Status { get; set; } = EnvironmentStatus.Missing;
+
+		/// <summary>
+		/// Derives the <see cref="Status"/> from the current state of the environment.
+		/// </summary>
+		public void DeriveStatus ()
+		{
+			if (Xcode is null || !CommandLineTools.IsInstalled) {
+				Status = EnvironmentStatus.Missing;
+				return;
+			}
+
+			if (Runtimes.Count == 0) {
+				Status = EnvironmentStatus.Partial;
+				return;
+			}
+
+			Status = EnvironmentStatus.Ok;
+		}
+	}
+}

Xamarin.MacDev/Models/SimulatorDeviceInfo.cs

@@ -0,0 +1,34 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+#nullable enable
+
+namespace Xamarin.MacDev.Models {
+
+	/// <summary>
+	/// Information about a simulator device from xcrun simctl.
+	/// </summary>
+	public class SimulatorDeviceInfo {
+		/// <summary>The simulator display name (e.g. "iPhone 16 Pro").</summary>
+		public string Name { get; set; } = "";
+
+		/// <summary>The simulator UDID.</summary>
+		public string Udid { get; set; } = "";
+
+		/// <summary>The device state (e.g. "Shutdown", "Booted").</summary>
+		public string State { get; set; } = "";
+
+		/// <summary>The runtime identifier (e.g. "com.apple.CoreSimulator.SimRuntime.iOS-18-2").</summary>
+		public string RuntimeIdentifier { get; set; } = "";
+
+		/// <summary>The device type identifier (e.g. "com.apple.CoreSimulator.SimDeviceType.iPhone-16-Pro").</summary>
+		public string DeviceTypeIdentifier { get; set; } = "";
+
+		/// <summary>Whether this simulator is available.</summary>
+		public bool IsAvailable { get; set; }
+
+		public bool IsBooted => State == "Booted";
+
+		public override string ToString () => $"{Name} ({Udid}) [{State}]";
+	}
+}

Xamarin.MacDev/Models/SimulatorRuntimeInfo.cs

@@ -0,0 +1,35 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+#nullable enable
+
+namespace Xamarin.MacDev.Models {
+
+	/// <summary>
+	/// Information about a simulator runtime from xcrun simctl.
+	/// </summary>
+	public class SimulatorRuntimeInfo {
+		/// <summary>The platform name (e.g. "iOS", "tvOS", "watchOS", "visionOS").</summary>
+		public string Platform { get; set; } = "";
+
+		/// <summary>The runtime version (e.g. "18.2").</summary>
+		public string Version { get; set; } = "";
+
+		/// <summary>The build version (e.g. "22C150").</summary>
+		public string BuildVersion { get; set; } = "";
+
+		/// <summary>The runtime identifier (e.g. "com.apple.CoreSimulator.SimRuntime.iOS-18-2").</summary>
+		public string Identifier { get; set; } = "";
+
+		/// <summary>The display name (e.g. "iOS 18.2").</summary>
+		public string Name { get; set; } = "";
+
+		/// <summary>Whether this runtime is available for use.</summary>
+		public bool IsAvailable { get; set; }
+
+		/// <summary>Whether this runtime is bundled with Xcode (vs downloaded separately).</summary>
+		public bool IsBundled { get; set; }
+
+		public override string ToString () => $"{Name} ({Identifier})";
+	}
+}

Xamarin.MacDev/Models/XcodeInfo.cs

@@ -0,0 +1,34 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+using System;
+
+#nullable enable
+
+namespace Xamarin.MacDev.Models {
+
+	/// <summary>
+	/// Information about an Xcode installation.
+	/// </summary>
+	public class XcodeInfo {
+		/// <summary>The path to the Xcode.app bundle (e.g. /Applications/Xcode.app).</summary>
+		public string Path { get; set; } = "";
+
+		/// <summary>The Xcode version (e.g. 16.2).</summary>
+		public Version Version { get; set; } = new Version (0, 0);
+
+		/// <summary>The Xcode build number (e.g. 16C5032a).</summary>
+		public string Build { get; set; } = "";
+
+		/// <summary>The DTXcode value from the version plist.</summary>
+		public string DTXcode { get; set; } = "";
+
+		/// <summary>Whether this is the currently selected Xcode (via xcode-select).</summary>
+		public bool IsSelected { get; set; }
+
+		/// <summary>Whether the Xcode path is or contains a symlink.</summary>
+		public bool IsSymlink { get; set; }
+
+		public override string ToString () => $"{Path} ({Version}, {Build})";
+	}
+}