Vim Copy File Path From Project Root

I often found myself typing file path manually when explaining code implementation and its use cases to my teammates. The task to type file path manually is very daunting and I hate it so much when I mistyped. The file path I mentioned is relative from project root. Let's say you have this structure

▾ Yomu/
  ▸ API/
  ▸ DataStructures/
  ▾ Screens/
  ┊ ▾ ChapterList/
  ┊ ┊ ┊ Chapter.swift
  ┊ ┊ ┊ ChapterCell.swift
  ┊ ┊ ┊ ChapterCell.xib
  ┊ ┊ ┊ ChapterCollectionHeader.swift
  ┊ ┊ ┊ ChapterCollectionHeader.xib
  ┊ ┊ ┊ ChapterCollectionViewController.swift
  ┊ ┊ ┊ ChapterCollectionViewController.xib
  ┊ ┊ ┊ ChapterCollectionViewModel.swift
  ┊ ┊ ┊ ChapterViewModel.swift
  ┊ ┊ ┊ ReadChapterRealm.swift
  ....
▸ YomuTests/

and you want to point out to someone an implementation in ChapterViewModel.swift, you would type this

Yomu/Screens/ChapterList/ChapterViewModel.swift

I did that a lot...

I knew there's a better way to do this. There's a built-in function in vim that returns the relative path (from project root) of a file in active buffer.

expand('%')

Of course we can do better than that! It'll be handy if we can copy the file path to system clipboard.

" Register relative file path of current buffer
" from project root to system clipboard
nnoremap <F10> :let @+ = expand("%")<CR>

Now everytime you press F10 in normal mode, it will automatically register file path to current active file in buffer to your system clipboard.