问题
Suppose I want to create a map in vim that will call an ex command as part of its work. And suppose that the ex command takes a register name as input.
Here is a toy example:
nmap <leader>p :put x
The problem there is that the 'x' register will always be used. But when typing, I want to be able to write:
"a<leader>p
To use the 'a' register, or:
"b<leader>p
to use the 'b' register.
Is there a way that I can pass the 'current normal-mode register' along to the 'ex' command?
回答1:
Ah, I figured it out.
The trick is to use <expr> in the mapping.
So, for my example, the answer is:
nnoremap <expr> <leader>p ':put ' . v:register . '<CR>'
Check :h map-expression and :h v:register for more info.
来源：https://stackoverflow.com/questions/14632109/passing-register-name-in-mapping-to-an-ex-command