[GSoC] The Fake Doubt

Hi,

I have been going through SoC Ideas[1], the project idea "Unify
ref-filter formats with other --pretty formats" attracted me a lot. As
far as I understood, the main aim of this is to get rid of duplication
of similar logic.

Currently, I'm going through `pretty.h` and `ref-filter.h`. Also, I
had gone through some past conversations. I found that Ogla Telezhnaya
did something similar in `cat-file`, that also worth going through.

Let me know If I'm going in right direction?

Thanks,
Hariom