Remap CTRL-x in insert mode

Question

I want to remap <C-x> in insert mode (I do not use the completion commands via this key). This is what I tried:

inoremap <C-x> <Esc> :x <Enter>

inoremap <C-x> <C-o> :x

Both variants are accepted by vim, but have no effect. When I execute :imap <C-x> I get:

<C-X> * <C-R>=<SNR>27_ManualCompletionEnter()<CR>.

I also tried to remove the default mapping:

iunmap <C-x>

which returns E474: Invalid argument.

So it seems that <C-x> is kind-of hard wired into vim and cannot be remapped. Is this correct or is there a way to achieve this?

Answer 1

Your current <C-X> mapping is created by the Supertab plugin.

I'm not sure off the top of my head whether overwriting it will break that plugin, but you can test it out by setting up your mapping after Supertab has loaded.

One way to add this to your configuration is to use a VimEnter autocommand, which runs after the rest of the startup has completed. Add the following to your vimrc:

augroup MyCTRLX
  autocmd VimEnter * inoremap <c-x> <Esc>:x<Enter>
augroup END