More project base

src/GuiApp/Avalonia/FileTime.GuiApp.App/Program.cs

@@ -0,0 +1,62 @@
+using System;
+using System.IO;
+using Avalonia;
+using FileTime.GuiApp;
+
+namespace FileTime.GuiApp
+{
+    public static class Program
+    {
+        public static string AppDataRoot { get; }
+        public static string EnvironmentName { get; }
+
+        static Program()
+        {
+
+#if DEBUG
+            EnvironmentName = "Development";
+
+            AppDataRoot = Path.Combine(Environment.CurrentDirectory, "appdata");
+#else
+            EnvironmentName = "Release";
+
+            var possibleDataRootsPaths = new List<string>()
+            {
+                Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "FileTime"),
+                Path.Combine(Assembly.GetEntryAssembly()?.Location ?? ".", "fallbackDataRoot")
+            };
+
+            string? appDataRoot = null;
+            foreach (var possibleAppDataRoot in possibleDataRootsPaths)
+            {
+                try
+                {
+                    var appDataRootDirectory = new DirectoryInfo(possibleAppDataRoot);
+                    if (!appDataRootDirectory.Exists) appDataRootDirectory.Create();
+
+                    //TODO write test
+                    appDataRoot = possibleAppDataRoot;
+                    break;
+                }
+                catch { }
+            }
+
+            if (appDataRoot == null) throw new UnauthorizedAccessException();
+            AppDataRoot = appDataRoot;
+#endif
+        }
+
+        // Initialization code. Don't use any Avalonia, third-party APIs or any
+        // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+        // yet and stuff might break.
+        [STAThread]
+        public static void Main(string[] args) => BuildAvaloniaApp()
+            .StartWithClassicDesktopLifetime(args);
+
+        // Avalonia configuration, don't remove; also used by visual designer.
+        public static AppBuilder BuildAvaloniaApp()
+            => AppBuilder.Configure<App>()
+                .UsePlatformDetect()
+                .LogToTrace();
+    }
+}