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I wanted to change the behavior of some keys in the :h i_CTRL-X submode. For example, I wanted to use the following:

inoremap <expr> <C-f> pumvisible() ? "\<C-x>\<C-f>" : "<C-f>"

The keybinding above is supposed to let me use only <C-f> after I've enabled the popupmenu with <C-x><C-f>. For example, say, I have the following directory and file in my popup-menu:

LICENCE
bin/

By default, I have to enable filename-completion with <C-x><C-f> and move to bin/ directory with <C-n> and if I want to move into the directory, I need to get out of that submode, which I used to do with <C-x> so that with one key I just got out of that previous submode and started getting into that submode again.

One more keypress is not a big deal, but I thought I should be able to make it one keypress. I wanted to use <C-f> to get out of that submode and also get into it again. It's fairly simple, until I learnt that it doesn't work with normal inoremap cause it's a separate submode and <C-f> works as <C-n> in that submode as the suggestion in the echo area suggests:

-- File name completion (^F^N^P) match 1 of 2

So, I don't know what to do now. I have also tried imap directly by the way, so that's not it. Any idea how to get a workaround?

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Some doc after :h complete_CTRL-Y:

Note: The keys that are valid in CTRL-X mode are not mapped.  This allows for
":map ^F ^X^F" to work (where ^F is CTRL-F and ^X is CTRL-X).  The key that
ends CTRL-X mode (any key that is not a valid CTRL-X mode command) is mapped.
Also, when doing completion with 'complete' mappings apply as usual.

You can not map <c-f> in CTRL-X submode because <c-f> is valid in CTRL-X submode, but you can map f, because f ends CTRL-X mode

inoremap <expr> f pumvisible() ? "\<c-y>\<c-x>\<c-f>" : "f"
  • I need to map <C-f>. That's the whole point. Otherwise, if I used f, I wouldn't even need "\<C-y>" part you added. This answer doesn't provide a solution to the question, only attest that the problem is reproducible and also mentioned in the docs (which I read btw, that's why I knew I needed a workaround) – klaus Apr 23 at 7:01
  • You can't map <c-f>, that's a sure thing. what kind of workaround would you like to find? – dedowsdi Apr 23 at 7:30
  • I need to map <C-f>. That is the workaround I need. The reason for <C-f> not working is that I'm in a submode, right? Then there must be a way to map key to that mode. Or maybe, I can change the keys that are valid in CTRL-X mode so that <C-f> can be mapped. I want this to happen for all the ins-completion keys in CTRL-X submode. That's why I can't just use another key like <C-g> for <C-f>. – klaus Apr 23 at 7:37

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