Vim: Use + as default register only for yank command

Question

I\'d like to use + register (system clipboard) only for yank command (that is, don\'t overwrite this register on dd or other commands).

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Answer 1

You can overwrite the default yank commands so that they default to the system clipboard, unless another register is explicitly given:

:nnoremap  y (v:register ==# '"' ? '"+' : '') . 'y'
:nnoremap  yy (v:register ==# '"' ? '"+' : '') . 'yy'
:nnoremap  Y (v:register ==# '"' ? '"+' : '') . 'Y'
:xnoremap  y (v:register ==# '"' ? '"+' : '') . 'y'
:xnoremap  Y (v:register ==# '"' ? '"+' : '') . 'Y'