How to Complete entire line containing keyword

Question

I have hidden buffers and I'd like to be able to get an import from another file to place into a file. For example, if I were to have this in another buffer:

import javafx.controls.Button;

if I were to type import and then do <c-x> <c-n> or <c-x> <c-l> I'd be able to get that line. But would it be possible for me to type in

Button

and then do a sequence to get matches for things that come before I type in Button? I suppose it's kind of a "reverse omni" or "line" completion.

Answer 1

EDIT Actually junegunn already has everything covered for you. Since you already use fzf you can add this to your vimrc:

imap <c-x><c-l> <plug>(fzf-complete-line)

And now <c-x><c-l> will use fzf to fuzzy match your line against the existing one in your buffers and complete directly in your buffer.

See fzf's readme for the list of available completion functions.

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One way to do it would to be leverage the :Lines function provided by fzf. This is probably a bit overkill if you don't already have the plugin in your workflow but if you, do you could add this mapping to your vimrc:

nnoremap <leader>i :execute('Lines ' . expand('<cWORD>'))<CR>

The mapping calls the Lines command with the WORD under your cursor as argument (see :h <cWORD> and :h execute())

Then when you are in normal mode and your cursor is on Button you can use <leader>i (or any key you'll use in your mapping) and this will show this kind of window with the list of the lines in the open buffers matching the word under your cursor.

Fzf provides two related commands which could be useful here:

You could also make something using only built-in vim features but that requires a bit more work. A starting point would probably be to read :h 'grepprg'.