How can I print the source code of methods in Managed Reference (API) pages?

[michfuchs]

I'm already using PostProcessors, and probably I could make it work with these alone. But I would rather understand how to influence the whole docfx templating chain. My goal is to add a custom tag to my API method documentation, so something like this (note the print tag):

/// <summary>
/// Doesn't do much
/// </summary>
/// <print>true</print>
public void MyMethod()
{
    return null;
}

If this print tag is set to true, the method's source code should be printed to the documentation.

How would you go about this? Am I more or less on the right track with the following?

1. How I can access a custom tag in the FileViewModel/PageViewModel I receive in my IDocumentBuildStep (see below)?
2. How can I pass information from the IDocumentBuildStep to the preprocessor/renderer?

I've tried to add a IDocumentBuildStep to the ManagedReferenceDocumentProcessor as an approximation:

[Export("ManagedReferenceDocumentProcessor", typeof(IDocumentBuildStep))]

    public override IEnumerable<FileModel> Prebuild(ImmutableList<FileModel> models, IHostService host)
    {
        foreach (var model in models)
        {
           // if (((dynamic)model.Content).Items[0].Tags["print"] == true) {     // how can I access a "custom" tag on my API method?
            var src = ((dynamic)model.Content).Items[0].Source; // Content is PageViewModel, Content.Items[0] is ItemsViewModel
            if (src != null) 
            {
                var filePath = src.Path;
                var startingLineNumber = src.StartLine;
                var methodCode = ExtractMethodSourceCode(filePath, startingLineNumber); // uses Roslyn to get method body (works)
                model.Properties.SourceCode = methodCode; // where can I store the source code, so I can access it later in the JS preprocessor or Razor renderer?
            }
        }
        return base.Prebuild(models, host);
    }