Controlling <Tab> Completion (Again)

[ewhac]

Here's what I want: If a completion list popup is not being displayed, then I want the <Tab> key to insert indentation characters, be they spaces or a literal TAB character.

However, if a completion list popup is being displayed, then I want <Tab>/<S-Tab> to cycle forwards/backwards through the available items.

After reviewing the pertinent docs, I'm unable to figure out how to accomplish what I want. I'm finding it increasingly frustrating to press <Tab> after entering a keyword/variable/function name expecting to advance the cursor, only to have the completion popup reappear. I've tried setting suggest.autoTrigger to trigger, but that doesn't seem to have helped.

My thanks in advance.

[fannheyward]

Does this work for you?

inoremap <silent><expr> <TAB>
      \ pumvisible() ? "\<C-n>" :
      \ <SID>check_back_space() ? "\<TAB>" :
      \ coc#refresh()

[ewhac]

It does not; I already have exactly that in an init script. In fact, that very snippet appears in doc/coc.txt describing how to trigger completion using TAB.

Hrm. Staring at that snippet for a few minutes, it looks like what I want might be:

inoremap <silent><expr> <TAB>
	\ pumvisible() ? "\<C-n>" :
	\ "\<TAB>"

Hmm. That's just about what I want. Alas, it looks like nvim-qt doesn't handle <C-space> correctly yet, so I'll have to pick a different trigger key...