Paste into a new line and preserve indentation

Question

I want a mapping that does it. Apparently, it is not that simple. Because first, it might decide to keep it commented when I press o. And it behaves differently if it was copied by yy, insists adding additional <CR>. My best effort so far is this:

function! MPf()
    let @+ =substitute(@+,"\<NL>$","",'')
    exec "norm x\"+]P"
endfunction


nnoremap mp o <esc>:s/[^ \t]//ge<CR>:call MPf()<CR>

I add a space so that won't cancel indentation. I delete every comment like char in a new line.

But some combination of doing y/yy and when on indented line/unindent line originally still cause troubles. And somehow I don't get rid of the additional \0.

Answer 1

The command ]p does almost what you want, except it is not guaranteed to be linewise.

In tpope/vim-unimpaired plugin it's already remapped to work linewise only, so if you use it (which I suggest anyway), you get it for free.

Otherwise, you can implement the same trick yourself:

nnoremap <silent>]p :call <SID>putline("]p")<CR>

function s:putline(how)
    let l:type = getregtype(v:register)
    call setreg(getreg(v:register), "V")
    execute 'normal! "' . v:register . a:how
    call setreg(getreg(v:register), l:type)
endfunction

See plugin's source code for a more complete version.