Make neocomplete work like AutoComplPop

Question

After getting many crashes with AutoComplPop, I switched to neocomplete. I have already found the let g:neocomplete#enable_auto_select = 1 option which selects neocomplete's first suggestion when you hit return, as AutoComplPop does.

But I can't figure out how to do the following:

1. Let's say I want to select the 3rd suggestion, so I <Cn> twice to get it highlighted. With AutoComplPop, I could now hit return and the currently highlight suggestion would be selected, and the suggestion window closed, without inserting a newline. With neocomplete, a newline is inserted. I realize I can just hit space and keep typing, but I want the <CR> behavior to be consistent whether I'm selecting the first suggestion or another. Otherwise muscle memory leads to mistakes.

2. How can I get suggestions from all buffers, rather than just the current one?

3. Can I use neocomplete with intelli-sense plugins like vim-ruby, so that the completions for, say, a String object show only string methods?

4. I'd like each completion to be added as a separate entry in the undo history, so that I can u to undo a completion. Is this possible?

Answer 1

I believe what you want for question #1 is this:

function! s:close_popup_and_complete()
  return pumvisible() ? neocomplete#close_popup() : "\<CR>"
endfunction

" <CR>: close popup and save indent.
inoremap <silent> <CR> <C-r>=<SID>close_popup_and_complete()<CR>

For question #2 I believe that behavior was a bug and has since been fixed.