how can I have fabric self-review using input sources and initial output?

[gallo-s-chingon]

So Ideally, I would like to have fabric, or a pattern:

• read file … create a response output file
• reread file and read response output file … create output_file2
• reread file, read output_file, read output_file2 … create a pattern based response using the insights/wisdom from output_files and the original file.

I don't know if fabric can do this already, or if this should be a shell function. but I just don't see a function being able to tell fabric to use two files as input. or to use a previous session info.