fix: Correct Python check in case of Microsoft Store

UnoCheck/Checkups/WindowsPythonInstallationCheckup.cs

@@ -4,39 +4,66 @@
 using DotNetCheck.Models;
 using DotNetCheck.Solutions;
 using Microsoft.Win32;
+using System.Diagnostics;
 using System.Threading.Tasks;
 
 namespace DotNetCheck.Checkups
 {
-	public class WindowsPythonInstallationCheckup : Checkup
-	{
-		public override string Id => "windowspyhtonInstallation";
-
-		public override string Title => "Windows Python Installation Checkup";
-
-		public override bool IsPlatformSupported(Platform platform) => platform == Platform.Windows;
-
-		public override async Task<DiagnosticResult> Examine(SharedState history)
-		{
-			RegistryKey pyLaucherKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\WOW6432Node\Python\PyLauncher", false);
-			string? path = pyLaucherKey?.GetValue(InstallDirKey)?.ToString();
-
-			if (pyLaucherKey is null || string.IsNullOrEmpty(path))
-			{
-				return await Task.FromResult(new DiagnosticResult(
-				Status.Error,
-				this,
-				new Suggestion("In order to build WebAssembly apps using AOT, you will need to install Python from Windows Store, or manually through Python's official site",
-				new PythonIsInstalledSolution())));
-			}
-			else
-			{
-				ReportStatus($"Python is installed in {path}.", Status.Ok);
-			}
-
-			return await Task.FromResult(DiagnosticResult.Ok(this));
-		}
-
-		private const string InstallDirKey = "InstallDir";
-	}
+    public class WindowsPythonInstallationCheckup : Checkup
+    {
+        public override string Id => "windowspyhtonInstallation";
+
+        public override string Title => "Windows Python Installation Checkup";
+
+        public override bool IsPlatformSupported(Platform platform) => platform == Platform.Windows;
+
+        public override async Task<DiagnosticResult> Examine(SharedState history)
+        {
+            var checkResult = RegistryCheck();
+            if (!checkResult.available)
+            {
+                // In case of Microsoft Store version, the registry key is not set.
+                // Fall back to where command.
+                checkResult = WhereCheck();
+            }
+
+            if (!checkResult.available)
+            {
+                return await Task.FromResult(new DiagnosticResult(
+                Status.Error,
+                this,
+                new Suggestion("In order to build WebAssembly apps using AOT, you will need to install Python from Microsoft Store, winget, or manually through Python's official site",
+                new PythonIsInstalledSolution())));
+            }
+            else
+            {
+                ReportStatus($"Python is installed in {checkResult.path}.", Status.Ok);
+            }
+
+            return await Task.FromResult(DiagnosticResult.Ok(this));
+        }
+
+        private const string InstallDirKey = "InstallDir";
+
+        private (bool available, string? path) RegistryCheck()
+        {
+            var pyLaucherKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\WOW6432Node\Python\PyLauncher", false);
+            string? path = pyLaucherKey?.GetValue(InstallDirKey)?.ToString();
+            var available = pyLaucherKey is not null && !string.IsNullOrEmpty(path);
+            return (available, path);
+        }
+
+        private (bool available, string? path) WhereCheck()
+        {
+            using Process process = new Process();
+            process.StartInfo.FileName = "where";
+            process.StartInfo.Arguments = "python";
+            process.StartInfo.UseShellExecute = false;
+            process.StartInfo.RedirectStandardOutput = true;
+            process.Start();
+
+            string output = process.StandardOutput.ReadToEnd();
+            return (!string.IsNullOrEmpty(output), output);
+        }
+    }
 }