2

I would like to use CTRLH for two different commands, depending on the context.

If there is a split left to the currently focused split, focus it:

nnoremap <c-h> <C-w>h

Otherwise, focus the previous tab:

nnoremap <c-h> gT<cr>

How can I express this condition in my ~/.vimrc?

2

One way is to check window number with winnr(). If number didn't changed, there's nothing to the left any more and previous tab will be selected.

function! LeftOrPrevTab()
  let win_no = winnr()
  wincmd h
  if win_no == winnr()
    normal gT
  endif
endfunction

nnoremap <C-h> :call LeftOrPrevTab()<CR>

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