XDG Base Directory Specification #666

2026-10-27 04:41:15 +08:00 · 2021-11-05 23:15:06 +08:00
parent 97ec1bc27a
commit edbcf22580
3 changed files with 133 additions and 16 deletions
@@ -0,0 +1,99 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace System.Application
+{
+    /// <summary>
+    /// 适用于 Linux 的文件系统初始化
+    /// <para>XDG Base Directory Specification</para>
+    /// <para>https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html</para>
+    /// <para>https://wiki.archlinux.org/title/XDG_Base_Directory</para>
+    /// </summary>
+    public sealed class FileSystemDesktopXDG : IOPath.FileSystemBase
+    {
+        private FileSystemDesktopXDG() => throw new NotSupportedException();
+
+        /// <inheritdoc cref="FileSystemDesktop.InitFileSystem"/>
+        public static void InitFileSystem()
+        {
+            var appDataPath = AppDataDirectory;
+            var cachePath = CacheDirectory;
+
+            var paths = new[] { appDataPath, cachePath, };
+            var dict_paths = paths.ToDictionary(x => x, Directory.Exists);
+
+            if (dict_paths.Values.All(x => !x))
+            {
+                var old_paths = new[] { FileSystemDesktop.AppDataDirectory, FileSystemDesktop.CacheDirectory, };
+                if (old_paths.All(Directory.Exists)) // 迁移之前根目录上的文件夹
+                {
+                    for (int i = 0; i < old_paths.Length; i++)
+                    {
+                        var path = paths[i];
+                        var old_path = old_paths[i];
+                        Directory.Move(old_path, path);
+                        dict_paths[path] = true;
+                    }
+                }
+            }
+
+            foreach (var item in dict_paths)
+            {
+                if (!item.Value)
+                {
+                    Directory.CreateDirectory(item.Key);
+                }
+            }
+
+            InitFileSystem(GetAppDataDirectory, GetCacheDirectory);
+            string GetAppDataDirectory() => appDataPath;
+            string GetCacheDirectory() => cachePath;
+        }
+
+        static string AppDataDirectory
+        {
+            get
+            {
+                var value = Environment.GetEnvironmentVariable(XDG_DATA_HOME);
+                if (!string.IsNullOrWhiteSpace(value))
+                {
+                    return Path.Combine(value, Constants.HARDCODED_APP_NAME);
+                }
+                value = Environment.GetEnvironmentVariable(HOME);
+                if (!string.IsNullOrWhiteSpace(value))
+                {
+                    return Path.Combine(value, ".local", "share", Constants.HARDCODED_APP_NAME);
+                }
+                throw new PlatformNotSupportedException();
+            }
+        }
+
+        static string CacheDirectory
+        {
+            get
+            {
+                var value = Environment.GetEnvironmentVariable(XDG_CACHE_HOME);
+                if (!string.IsNullOrWhiteSpace(value))
+                {
+                    return Path.Combine(value, Constants.HARDCODED_APP_NAME);
+                }
+                value = Environment.GetEnvironmentVariable(HOME);
+                if (!string.IsNullOrWhiteSpace(value))
+                {
+                    return Path.Combine(value, ".cache", Constants.HARDCODED_APP_NAME);
+                }
+                throw new PlatformNotSupportedException();
+            }
+        }
+
+        const string HOME = "$HOME";
+
+        const string XDG_DATA_HOME = "$XDG_DATA_HOME";
+
+        const string XDG_CACHE_HOME = "$XDG_CACHE_HOME";
+    }
+}