Add initial options file implementation

Patcher/Patcher.csproj

@@ -10,4 +10,10 @@
     <Folder Include="Properties\PublishProfiles\" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Update="options.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
 </Project>

Patcher/PatcherOptions.cs

@@ -0,0 +1,15 @@
+namespace Patcher
+{
+    public class PatcherOptions
+    {
+        public string ThemeName { get; set; }
+
+        public string FileLocation { get; set; }
+
+        public string Version { get; set; }
+
+        public OperatingSystem? OperatingSystem { get; set; }
+
+        public bool? Force { get; set; }
+    }
+}

Patcher/Program.cs

@@ -4,19 +4,25 @@
 using System.Linq;
 using NDesk.Options;
 using System.Runtime.InteropServices;
+using System.Text.Json;
 
 namespace Patcher
 {
     internal static class Program
     {
         internal static void Main(string[] args)
         {
-            var themeName = string.Empty;
+            var options = new PatcherOptions();
+            var optionsFile = new FileInfo("options.json");
+            if (optionsFile.Exists)
+                options = JsonSerializer.Deserialize<PatcherOptions>(File.ReadAllText(optionsFile.FullName));
+
+            var themeName = options.ThemeName ?? string.Empty;
             var help = false;
-            var fileLocation = string.Empty;
-            var os = OperatingSystem.Unknown;
-            var version = string.Empty;
-            var force = false;
+            var fileLocation = options.FileLocation ?? string.Empty;
+            var os = options.OperatingSystem ?? OperatingSystem.Unknown;
+            var version = options.Version ?? string.Empty;
+            var force = options.Force ?? false;
 
             var optionSet = new OptionSet
             {
@@ -186,10 +192,9 @@ private static void CreateBackup(FileSystemInfo fileInfo, MemoryStream ms)
                 backupFileInfo.Delete();
 
             using var backupWriteStream = backupFileInfo.OpenWrite();
-
-                backupWriteStream.Write(ms.ToArray(), 0, (int)ms.Length);
-
 
+            backupWriteStream.Write(ms.ToArray(), 0, (int)ms.Length);
+
             if (backupFileInfo.Exists)
                 Console.WriteLine($"Backup '{backupFileInfo.Name}' created.");
         }
@@ -230,13 +235,13 @@ private static void PatchExecutable(MemoryStream ms, FileStream fs, PatchInfo pa
             Console.WriteLine($"Patching to {themeName}...");
 
             foreach (var offset in offsets)
-            
+
                 for (var i = 0; i < themeBytes.Length; i++)
                 {
                     fs.Position = offset + i;
                     fs.WriteByte(themeBytes[i]);
                 }
-            
+
 
             Console.WriteLine("Unity was successfully patched. Enjoy!");
         }

Patcher/options.json

@@ -0,0 +1,7 @@
+{
+  "ThemeName": "dark", 
+  "FileLocation": "",
+  "Version": "",
+  "OperatingSystem": null,
+  "Force": false
+}