diff --git a/src/Generator.Rewrite/Program.cs b/src/Generator.Rewrite/Program.cs
index e866b00f..1a888d21 100644
--- a/src/Generator.Rewrite/Program.cs
+++ b/src/Generator.Rewrite/Program.cs
@@ -52,10 +52,7 @@ namespace OpenTK.Rewrite
             }
 
             var program = new Program();
-            var file = args[0];
-            var key = args[1];
-            var options = args.Where(a => a.StartsWith("-") || a.StartsWith("/"));
-            program.Rewrite(file, key, options);
+            program.Rewrite();
         }
 
         // mscorlib types
@@ -69,13 +66,8 @@ namespace OpenTK.Rewrite
         // OpenTK.BindingsBase
         private static TypeDefinition TypeBindingsBase;
 
-        private static bool dllimport;
-
-        private void Rewrite(string file, string keyfile, IEnumerable<string> options)
+        private void Rewrite()
         {
-            IEnumerable<string> optionsEnumerated = options as IList<string> ?? options.ToList();
-            dllimport = optionsEnumerated.Contains("-dllimport");
-
             // Specify assembly read and write parameters
             // We want to keep a valid symbols file (pdb or mdb)
             var read_params = new ReaderParameters();
@@ -85,11 +77,11 @@ namespace OpenTK.Rewrite
             read_params.ReadWrite = true;
             write_params.WriteSymbols = true;
 
-            if (!String.IsNullOrEmpty(keyfile) && File.Exists(keyfile))
+            if (!String.IsNullOrEmpty(Options.StrongNameKey) && File.Exists(Options.StrongNameKey))
             {
-                keyfile = Path.GetFullPath(keyfile);
+                string absoluteKeyFilePath = Path.GetFullPath(Options.StrongNameKey);
 
-                using (var fs = new FileStream(keyfile, FileMode.Open, FileAccess.Read))
+                using (var fs = new FileStream(absoluteKeyFilePath, FileMode.Open, FileAccess.Read))
                 {
                     var keypair = new System.Reflection.StrongNameKeyPair(fs);
                     write_params.StrongNameKeyPair = keypair;
@@ -103,7 +95,7 @@ namespace OpenTK.Rewrite
             // Load assembly and process all modules
             try
             {
-                using (AssemblyDefinition assembly = AssemblyDefinition.ReadAssembly(file, read_params))
+                using (AssemblyDefinition assembly = AssemblyDefinition.ReadAssembly(Options.TargetAssembly, read_params))
                 {
                     var rewritten = assembly.CustomAttributes.FirstOrDefault(a => a.AttributeType.Name == "RewrittenAttribute");
                     if (rewritten == null)
@@ -143,7 +135,7 @@ namespace OpenTK.Rewrite
                         {
                             foreach (var type in module.Types)
                             {
-                                Rewrite(type, optionsEnumerated);
+                                Rewrite(type);
                             }
                         }
                     }
@@ -163,7 +155,7 @@ namespace OpenTK.Rewrite
             }
         }
 
-        private void Rewrite(TypeDefinition type, IEnumerable<string> options)
+        private void Rewrite(TypeDefinition type)
         {
             var entry_points = type.Fields.FirstOrDefault(f => f.Name == "EntryPoints");
             if (entry_points != null)
@@ -173,7 +165,7 @@ namespace OpenTK.Rewrite
                 entry_signatures.AddRange(type.Methods
                     .Where(t => t.CustomAttributes.Any(a => a.AttributeType.Name == "SlotAttribute")));
 
-                Rewrite(type, entry_points, entry_signatures, options);
+                Rewrite(type, entry_points, entry_signatures);
 
                 RemoveNativeSignatures(type, entry_signatures);
             }
@@ -191,7 +183,7 @@ namespace OpenTK.Rewrite
         private static int GetSlot(MethodDefinition signature)
         {
             // Pretend there is no slots if we want to force everything to work through DllImport (Android & iOS)
-            if (dllimport)
+            if (Options.UseDLLImport)
             {
                 return -1;
             }
@@ -207,14 +199,13 @@ namespace OpenTK.Rewrite
         }
 
         private void Rewrite(TypeDefinition type, FieldDefinition entry_points,
-            List<MethodDefinition> entry_signatures, IEnumerable<string> options)
+            List<MethodDefinition> entry_signatures)
         {
             // Rewrite all wrapper methods
             var wrapper_signatures = new List<MethodDefinition>();
             wrapper_signatures.AddRange(type.Methods
                 .Where(m => m.IsPublic && m.CustomAttributes.Any(a => a.AttributeType.Name == "AutoGeneratedAttribute")));
 
-            IEnumerable<string> optionsEnumerated = options as IList<string> ?? options.ToList();
             foreach (var wrapper in wrapper_signatures)
             {
                 var autogenerated = wrapper.CustomAttributes
@@ -226,7 +217,7 @@ namespace OpenTK.Rewrite
                     var signature = entry_signatures.FirstOrDefault(s => s.Name == signature_name);
                     int slot = GetSlot(signature);
 
-                    ProcessMethod(wrapper, signature, slot, entry_points, optionsEnumerated);
+                    ProcessMethod(wrapper, signature, slot, entry_points);
                 }
             }
 
@@ -236,7 +227,7 @@ namespace OpenTK.Rewrite
             {
                 foreach (var nested_type in type.NestedTypes)
                 {
-                    Rewrite(nested_type, entry_points, entry_signatures, optionsEnumerated);
+                    Rewrite(nested_type, entry_points, entry_signatures);
                 }
             }
         }
@@ -283,7 +274,7 @@ namespace OpenTK.Rewrite
 
         // Create body for method
         private static void ProcessMethod(MethodDefinition wrapper, MethodDefinition native, int slot,
-                                  FieldDefinition entry_points, IEnumerable<string> options)
+                                  FieldDefinition entry_points)
         {
             var body = wrapper.Body;
             var il = body.GetILProcessor();
@@ -294,8 +285,7 @@ namespace OpenTK.Rewrite
             // and push each parameter on the stack
 
             DebugVariables vars = null;
-            IEnumerable<string> optionsEnumerated = options as IList<string> ?? options.ToList();
-            if (optionsEnumerated.Contains("-debug"))
+            if (Options.EnableDebugCalls)
             {
                 vars = EmitDebugPrologue(wrapper, il);
             }
@@ -333,7 +323,7 @@ namespace OpenTK.Rewrite
 
             EmitParameterEpilogues(wrapper, native, body, il, generatedVariables);
 
-            if (optionsEnumerated.Contains("-debug"))
+            if (Options.EnableDebugCalls)
             {
                 EmitDebugEpilogue(wrapper, il, vars);
             }