move game detection into toolkit for reuse

1 files changed, 129 insertions, 0 deletions

diff --git a/src/SMAPI.Toolkit/Framework/GameScanning/GameScanner.cs b/src/SMAPI.Toolkit/Framework/GameScanning/GameScanner.cs
new file mode 100644
index 00000000..1755a7db
--- /dev/null
+++ b/src/SMAPI.Toolkit/Framework/GameScanning/GameScanner.cs
@@ -0,0 +1,129 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using StardewModdingAPI.Toolkit.Utilities;
+#if SMAPI_FOR_WINDOWS
+using Microsoft.Win32;
+#endif
+
+namespace StardewModdingAPI.Toolkit.Framework.GameScanning
+{
+    /// <summary>Finds installed game folders.</summary>
+    public class GameScanner
+    {
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Find all valid Stardew Valley install folders.</summary>
+        /// <remarks>This checks default game locations, and on Windows checks the Windows registry for GOG/Steam install data. A folder is considered 'valid' if it contains the Stardew Valley executable for the current OS.</remarks>
+        public IEnumerable<DirectoryInfo> Scan()
+        {
+            // get unique candidate paths
+            Platform platform = EnvironmentUtility.DetectPlatform();
+            string executableFilename = EnvironmentUtility.GetExecutableName(platform);
+            IEnumerable<string> paths = this.GetDefaultInstallPaths(platform).Select(PathUtilities.NormalisePathSeparators).Distinct(StringComparer.InvariantCultureIgnoreCase);
+
+            // get valid folders
+            foreach (string path in paths)
+            {
+                DirectoryInfo folder = new DirectoryInfo(path);
+                if (folder.Exists && folder.EnumerateFiles(executableFilename).Any())
+                    yield return folder;
+            }
+        }
+
+
+        /*********
+        ** Private methods
+        *********/
+        /// <summary>The default file paths where Stardew Valley can be installed.</summary>
+        /// <param name="platform">The target platform.</param>
+        /// <remarks>Derived from the crossplatform mod config: https://github.com/Pathoschild/Stardew.ModBuildConfig. </remarks>
+        private IEnumerable<string> GetDefaultInstallPaths(Platform platform)
+        {
+            switch (platform)
+            {
+                case Platform.Linux:
+                case Platform.Mac:
+                    {
+                        string home = Environment.GetEnvironmentVariable("HOME");
+
+                        // Linux
+                        yield return $"{home}/GOG Games/Stardew Valley/game";
+                        yield return Directory.Exists($"{home}/.steam/steam/steamapps/common/Stardew Valley")
+                            ? $"{home}/.steam/steam/steamapps/common/Stardew Valley"
+                            : $"{home}/.local/share/Steam/steamapps/common/Stardew Valley";
+
+                        // Mac
+                        yield return "/Applications/Stardew Valley.app/Contents/MacOS";
+                        yield return $"{home}/Library/Application Support/Steam/steamapps/common/Stardew Valley/Contents/MacOS";
+                    }
+                    break;
+
+                case Platform.Windows:
+                    {
+                        // Windows
+                        foreach (string programFiles in new[] { @"C:\Program Files", @"C:\Program Files (x86)" })
+                        {
+                            yield return $@"{programFiles}\GalaxyClient\Games\Stardew Valley";
+                            yield return $@"{programFiles}\GOG Galaxy\Games\Stardew Valley";
+                            yield return $@"{programFiles}\Steam\steamapps\common\Stardew Valley";
+                        }
+
+                        // Windows registry
+#if SMAPI_FOR_WINDOWS
+                        IDictionary<string, string> registryKeys = new Dictionary<string, string>
+                        {
+                            [@"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Steam App 413150"] = "InstallLocation", // Steam
+                            [@"SOFTWARE\WOW6432Node\GOG.com\Games\1453375253"] = "PATH", // GOG on 64-bit Windows
+                        };
+                        foreach (var pair in registryKeys)
+                        {
+                            string path = this.GetLocalMachineRegistryValue(pair.Key, pair.Value);
+                            if (!string.IsNullOrWhiteSpace(path))
+                                yield return path;
+                        }
+
+                        // via Steam library path
+                        string steampath = this.GetCurrentUserRegistryValue(@"Software\Valve\Steam", "SteamPath");
+                        if (steampath != null)
+                            yield return Path.Combine(steampath.Replace('/', '\\'), @"steamapps\common\Stardew Valley");
+#endif
+                    }
+                    break;
+
+                default:
+                    throw new InvalidOperationException($"Unknown platform '{platform}'.");
+            }
+        }
+
+#if SMAPI_FOR_WINDOWS
+        /// <summary>Get the value of a key in the Windows HKLM registry.</summary>
+        /// <param name="key">The full path of the registry key relative to HKLM.</param>
+        /// <param name="name">The name of the value.</param>
+        private string GetLocalMachineRegistryValue(string key, string name)
+        {
+            RegistryKey localMachine = Environment.Is64BitOperatingSystem ? RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry64) : Registry.LocalMachine;
+            RegistryKey openKey = localMachine.OpenSubKey(key);
+            if (openKey == null)
+                return null;
+            using (openKey)
+                return (string)openKey.GetValue(name);
+        }
+
+        /// <summary>Get the value of a key in the Windows HKCU registry.</summary>
+        /// <param name="key">The full path of the registry key relative to HKCU.</param>
+        /// <param name="name">The name of the value.</param>
+        private string GetCurrentUserRegistryValue(string key, string name)
+        {
+            RegistryKey currentuser = Environment.Is64BitOperatingSystem ? RegistryKey.OpenBaseKey(RegistryHive.CurrentUser, RegistryView.Registry64) : Registry.CurrentUser;
+            RegistryKey openKey = currentuser.OpenSubKey(key);
+            if (openKey == null)
+                return null;
+            using (openKey)
+                return (string)openKey.GetValue(name);
+        }
+#endif
+    }
+}