Optional command to add a file header in each generated file

FFmpeg.AutoGen.CppSharpUnsafeGenerator/CliOptions.cs

@@ -59,6 +59,10 @@ public class CliOptions
         HelpText = "Print details during execution.")]
     public bool Verbose { get; set; }
 
+    [Option("fileHeader",
+        HelpText = "Optional string to use as header for generated files.")]
+    public string FileHeader { get; set; }
+
     [Option("noCustomStringMarshal",
         Default = false,
         HelpText = "Don't use custom string marshallers; all strings are marshalled as UnmanagedType.LPUTF8Str regardless of .NET target framework.")]

FFmpeg.AutoGen.CppSharpUnsafeGenerator/Generation/GenerationContext.cs

@@ -15,4 +15,5 @@ internal sealed record GenerationContext
     public Dictionary<string, InlineFunctionDefinition> ExistingInlineFunctionMap { get; init; } = new();
     public string SolutionDir { get; init; } = string.Empty;
     public string OutputDir { get; init; } = string.Empty;
+    public string FileHeader { get; init; } = string.Empty;
 }

FFmpeg.AutoGen.CppSharpUnsafeGenerator/Generation/GeneratorBase.cs

@@ -52,6 +52,12 @@ void IDisposable.Dispose()
 
     public virtual void Generate()
     {
+        if (!string.IsNullOrEmpty(Context.FileHeader))
+        {
+            WriteLine(Context.FileHeader);
+            WriteLine();
+        }
+
         var usings = Usings().ToList();
         usings.ForEach(ns => WriteLine($"using {ns};"));
         if (usings.Count > 0) WriteLine();

FFmpeg.AutoGen.CppSharpUnsafeGenerator/Program.cs

@@ -67,7 +67,8 @@ internal static void Main(string[] args)
                 .ToDictionary(x => x.LibraryName, x => x.LibraryVersion),
             Definitions = processingContext.Definitions.ToArray(),
             ExistingInlineFunctionMap = inlineFunctions.ToDictionary(f => f.Name),
-            SolutionDir = options.SolutionDir
+            SolutionDir = options.SolutionDir,
+            FileHeader = options.FileHeader,
         };
 
         GenerateLegacyFFmpegAutoGen(generationContext);