Improve identification of .minecraft directory

This will use the following, in this order:

- $XDG_CONFIG_HOME/truecraft
- .config/truecraft (%APPDATA% on Windows)
- ~/.truecraft (%USERPROFILE% on Windows)

Fixes #201

TrueCraft.Client/TrueCraftGame.cs

@@ -308,8 +308,7 @@ namespace TrueCraft.Client
 
         public void TakeScreenshot()
         {
-            var path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
+            var path = Path.Combine(Paths.Screenshots, DateTime.Now.ToString("yyyy-MM-dd_H.mm.ss") + ".png");
-                           ".truecraft", "screenshots", DateTime.Now.ToString("yyyy-MM-dd_H.mm.ss") + ".png");
             if (!Directory.Exists(Path.GetDirectoryName(path)))
                 Directory.CreateDirectory(Path.GetDirectoryName(path));
             using (var stream = File.OpenWrite(path))

TrueCraft.Core/Paths.cs

@@ -0,0 +1,65 @@
+using System;
+using System.IO;
+
+namespace TrueCraft.Core
+{
+    public static class Paths
+    {
+        public static string Base
+        {
+            get
+            {
+                var xdg_config_home = Environment.GetEnvironmentVariable("XDG_CONFIG_HOME");
+                string config = null;
+                if (xdg_config_home != null)
+                {
+                    config = Path.Combine(xdg_config_home, "truecraft");
+                    if (Directory.Exists(config))
+                        return config;
+                }
+                var appdata = Path.Combine(
+                    Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
+                    "truecraft");
+                if (Directory.Exists(appdata))
+                    return appdata;
+                var userprofile = Path.Combine(
+                    Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
+                    ".truecraft");
+                if (Directory.Exists(userprofile))
+                    return userprofile;
+                // At this point, there's no existing data to choose from, so use the best option
+                if (config != null)
+                {
+                    Directory.CreateDirectory(config);
+                    return config;
+                }
+                Directory.CreateDirectory(appdata);
+                return appdata;
+            }
+        }
+
+        public static string Worlds
+        {
+            get
+            {
+                return Path.Combine(Base, "worlds");
+            }
+        }
+
+        public static string Settings
+        {
+            get
+            {
+                return Path.Combine(Base, "settings.json");
+            }
+        }
+
+        public static string Screenshots
+        {
+            get
+            {
+                return Path.Combine(Base, "screenshots");
+            }
+        }
+    }
+}

TrueCraft.Core/TrueCraft.Core.csproj

@@ -353,6 +353,7 @@
     <Compile Include="Physics\PhysicsEngine.cs" />
     <Compile Include="Entities\WolfEntity.cs" />
     <Compile Include="Windows\FurnaceWindow.cs" />
+    <Compile Include="Paths.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>

TrueCraft.Core/UserSettings.cs

@@ -8,15 +8,6 @@ namespace TrueCraft.Core
     {
         public static UserSettings Local { get; set; }
 
-        public static string SettingsPath
-        {
-            get
-            {
-                return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
-                    ".truecraft", "settings.json");
-            }
-        }
-
         public bool AutoLogin { get; set; }
         public string Username { get; set; }
         public string Password { get; set; }
@@ -44,14 +35,14 @@ namespace TrueCraft.Core
 
         public void Load()
         {
-            if (File.Exists(SettingsPath))
+            if (File.Exists(Paths.Settings))
-                JsonConvert.PopulateObject(File.ReadAllText(SettingsPath), this);
+                JsonConvert.PopulateObject(File.ReadAllText(Paths.Settings), this);
         }
 
         public void Save()
         {
-            Directory.CreateDirectory(Path.GetDirectoryName(SettingsPath));
+            Directory.CreateDirectory(Path.GetDirectoryName(Paths.Settings));
-            File.WriteAllText(SettingsPath, JsonConvert.SerializeObject(this, Formatting.Indented));
+            File.WriteAllText(Paths.Settings, JsonConvert.SerializeObject(this, Formatting.Indented));
         }
     }
 

TrueCraft.Launcher/Singleplayer/Worlds.cs

@@ -11,15 +11,6 @@ namespace TrueCraft.Launcher.Singleplayer
 {
     public class Worlds
     {
-        public static string WorldsPath
-        {
-            get
-            {
-                return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
-                    ".truecraft", "worlds");
-            }
-        }
-
         public static Worlds Local { get; set; }
 
         public BlockRepository BlockRepository { get; set; }
@@ -27,11 +18,11 @@ namespace TrueCraft.Launcher.Singleplayer
 
         public void Load()
         {
-            if (!Directory.Exists(WorldsPath))
+            if (!Directory.Exists(Paths.Worlds))
-                Directory.CreateDirectory(WorldsPath);
+                Directory.CreateDirectory(Paths.Worlds);
             BlockRepository = new BlockRepository();
             BlockRepository.DiscoverBlockProviders();
-            var directories = Directory.GetDirectories(WorldsPath);
+            var directories = Directory.GetDirectories(Paths.Worlds);
             var saves = new List<World>();
             foreach (var d in directories)
             {
@@ -63,7 +54,7 @@ namespace TrueCraft.Launcher.Singleplayer
             foreach (var c in Path.GetInvalidFileNameChars())
                 safeName = safeName.Replace(c.ToString(), "");
             world.Name = name;
-            world.Save(Path.Combine(WorldsPath, safeName));
+            world.Save(Path.Combine(Paths.Worlds, safeName));
             Saves = Saves.Concat(new[] { world }).ToArray();
             return world;
         }