Run from docker

src/Alma.App/Services/FolderService.cs

@@ -1,47 +1,70 @@
+using System.Diagnostics.CodeAnalysis;
+using Alma.Command.Diag;
+using Alma.Logging;
+
 namespace Alma.Services;
 
 public class FolderService : IFolderService
 {
+    private readonly Dictionary<string, Func<string?>> _configHomeProviders;
+    private readonly Dictionary<string, Func<string?>> _appDataProviders;
     public string? ConfigRoot { get; }
     public string AppData { get; }
 
     public string ApplicationSubfolderName => "alma";
 
+    [DynamicDependency(DynamicallyAccessedMemberTypes.All, typeof(FolderService))]
     public FolderService()
     {
+        _configHomeProviders = ConfigHomeProviders();
+        _appDataProviders = AppDataProviders();
+
         ConfigRoot = GetConfigHomePath();
         AppData = GetAppDataPath();
 
         if (!Directory.Exists(AppData)) Directory.CreateDirectory(AppData);
     }
 
-    public string GetPreferredConfigurationFolder()
+    private static Dictionary<string, Func<string?>> ConfigHomeProviders()
+    {
+        return new Dictionary<string, Func<string?>>
+        {
+            {"ALMA_CONFIG", () => Environment.GetEnvironmentVariable("ALMA_CONFIG")},
+            {"XDG_CONFIG_HOME", () => Environment.GetEnvironmentVariable("XDG_CONFIG_HOME")},
+            {"UserProfile", GetPreferredConfigurationFolder},
+            {"ALMA_CONFIG_FALLBACK", () => Environment.GetEnvironmentVariable("ALMA_CONFIG_FALLBACK")},
+        };
+    }
+
+    private static Dictionary<string, Func<string?>> AppDataProviders()
+    {
+        return new Dictionary<string, Func<string?>>
+        {
+            {"ALMA_APP_DATA", () => Environment.GetEnvironmentVariable("ALMA_APP_DATA")},
+            {"LocalApplicationData", () => Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData)},
+            {"ALMA_APP_DATA_FALLBACK", () => Environment.GetEnvironmentVariable("ALMA_APP_DATA_FALLBACK")},
+        };
+    }
+
+    string IFolderService.GetPreferredConfigurationFolder()
+        => GetPreferredConfigurationFolder();
+
+    public static string GetPreferredConfigurationFolder()
         => Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), ".config");
 
     private string? GetConfigHomePath()
     {
-        var configHomeProviders = new List<Func<string?>>
-        {
-            () => Environment.GetEnvironmentVariable("XDG_CONFIG_HOME"),
-            () => GetPreferredConfigurationFolder()
-        };
-
-        var configHome = EnumerateProviders(configHomeProviders);
+        var configHome = EnumerateProviders(_configHomeProviders.Values);
         return configHome == null ? null : Path.Combine(configHome, ApplicationSubfolderName);
     }
 
     private string GetAppDataPath()
     {
-        var appDataProviders = new List<Func<string?>>
-        {
-            () => Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData)
-        };
-
-        var appData = EnumerateProviders(appDataProviders) ?? Environment.CurrentDirectory;
+        var appData = EnumerateProviders(_appDataProviders.Values) ?? Environment.CurrentDirectory;
         return Path.Combine(appData, ApplicationSubfolderName);
     }
 
-    private static string? EnumerateProviders(List<Func<string?>> providers)
+    private static string? EnumerateProviders(IEnumerable<Func<string?>> providers)
     {
         string? result = null;
 
@@ -53,4 +76,26 @@ public class FolderService : IFolderService
 
         return result;
     }
+
+    [DiagnosticHelper("config-home-providers")]
+    public static void ConfigHomeProviderDiag(ILogger logger)
+    {
+        var configHomeProviders = ConfigHomeProviders();
+        logger.LogInformation($"There are {configHomeProviders.Count} config home providers:");
+        foreach (var configHome in configHomeProviders)
+        {
+            logger.LogInformation($"{configHome.Key} => {configHome.Value() ?? "<null>"}");
+        }
+    }
+
+    [DiagnosticHelper("app-data-providers")]
+    public static void AppDataProviderDiag(ILogger logger)
+    {
+        var appDataProviders = AppDataProviders();
+        logger.LogInformation($"There are {appDataProviders.Count} app data providers:");
+        foreach (var appData in appDataProviders)
+        {
+            logger.LogInformation($"{appData.Key} => {appData.Value() ?? "<null>"}");
+        }
+    }
 }