Experimental: Change source code generation method to file writing

Removed the source code generation from context and instead write the generated code directly to a file. This change allows us to save the refit generated code as standalone files. This approach could be beneficial for future debugging and preview purposes.

src/Refitter.SourceGenerator/RefitterSourceGenerator.cs

@@ -18,11 +18,11 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
             .Where(text => text.Path.EndsWith(".refitter", StringComparison.InvariantCultureIgnoreCase))
             .Select(GenerateCode);
 
-        context.RegisterSourceOutput(
-            sourceFiles,
-            (c, file) => c.AddSource(
-                file.Filename,
-                source: file.Source.ToString()));
+        // context.RegisterSourceOutput(
+        //     sourceFiles,
+        //     (c, file) => c.AddSource(
+        //         file.Filename,
+        //         source: file.Source.ToString()));
     }
 
     public void Initialize(GeneratorInitializationContext context)
@@ -59,7 +59,7 @@ private static void TryGenerateCode(GeneratorExecutionContext context, Additiona
         {
             var (sourceText, filename) = GenerateCode(file, context.CancellationToken);
 
-            context.AddSource(filename, sourceText);
+            // context.AddSource(filename, sourceText);
             context.ReportDiagnostic(
                 Diagnostic.Create(
                     new DiagnosticDescriptor(
@@ -129,6 +129,11 @@ private static (SourceText Source, string Filename) GenerateCode(
 
         var generator = RefitGenerator.CreateAsync(settings).GetAwaiter().GetResult();
         var refit = generator.Generate();
+
+        using var stream = File.CreateText(Path.Combine(Path.GetFullPath(file.Path), filename));
+        stream.Write(refit);
+        stream.Flush();
+
         return (SourceText.From(refit, Encoding.UTF8), filename);
     }
 }