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copied!<p>The above way is "kind of" working, but it's so unreadable that almost nobody could say what it actually does. <strong>The solution above is not good.</strong></p> <p><strong>Short Answer - Use this:</strong></p> <pre><code>function! Auto_complete_string() if pumvisible() return "\<C-n>" else return "\<C-x>\<C-o>\<C-r>=Auto_complete_opened()\<CR>" end endfunction function! Auto_complete_opened() if pumvisible() return "\<Down>" end return "" endfunction inoremap <expr> <Nul> Auto_complete_string() inoremap <expr> <C-Space> Auto_complete_string() </code></pre> <p>This answer also respects that there are two possible values (depending on terminal/gvim usage) for Ctrl+Space: <code><C-Space></code> and <code><Nul></code>. </p> <p>I use a similar approach as the first one in <a href="http://github.com/davidhalter/jedi-vim" rel="nofollow">jedi-vim</a>, but more customizable. </p> <hr> <p><strong>Long Answer - What the above does:</strong></p> <p>The whole escaping of the above answer is so confusing, that I've split the above answer into a readable format: </p> <pre><code>function! Auto_complete_string() if pumvisible() return "\<C-n>" else return "\<C-x>\<C-o>\<C-r>=Auto_complete_opened()\<CR>" end endfunction function! Auto_complete_opened() if pumvisible() return "\<c-n>\<c-p>\<c-n>" else return "\<bs>\<C-n>" end endfunction inoremap <expr> <Nul> Auto_complete_string() </code></pre> <p>This clearly shows what it is doing. There's some weird stuff happening in <code>Auto_complete_opened</code>. It's not just doing completion, it's doing two additional things after trying to complete:</p> <ul> <li>When trying to use the omnicompletion, it somehow does a <code><C-n><C-p><C-n></code>, which could IMHO just be abbreviated to <code><C-n></code>.</li> <li>In case completion is unsuccessful, it uses a backspace and does a completion again, not <code><C-o><C-x></code> but <code><C-n></code>, which just doesn't make a lot of sense.</li> </ul> <p>I'm not saying that this is not what some user might want, but it's probably not what most users want! My short answer takes that in credit and gives you a simple way to edit it. You can now just easily change things if you want to (for example <code><Down></code> to <code><C-n></code>, if you want the first entry to be written from the beginning on).</p>

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