How to automatically insert space after completion?

[grfrederic]

hi, i'm trying to make <C-Space> (if the completion list is visible) select the first option, confirm it, and insert a space. this is my code:

['<C-Space>'] = cmp.mapping(function(fallback)
    if cmp.visible() then
        cmp.confirm({select = true})
        vim.api.nvim_paste(" ", false, -1)  -- somehow get removed?
    else
        fallback()
    end
end, {'i', 's'}),

which works almost -- the space appears for a split second but then is overridden by the completion (if i change the paste command to insert something different like "SPACEHERE" it's possible to see it for a split second). does anyone know why this is happening and how to make it work?

[hrsh7th]

The cmp.confirm can accept the callback function.

cmp.confirm({ select = true }, function()
  -- then you can feed `<Space>` here.
end)

[grfrederic]

thank you very much! i'm happy; i also learned a bit of lua on the way. for anyone interested, i made it exclude snippets:

    ['<C-Space>'] = cmp.mapping(function(fallback)
        -- only if cmp is visible
        if cmp.visible() then

            -- get the first entry, select if it wasn't before
            local entry = cmp.get_selected_entry()
            if not entry then
                cmp.select_next_item()
                entry = cmp.get_selected_entry()
            end

            -- if the source is not a snippet, insert a space automatically
            local source = entry['source']['name']
            if source == 'luasnip' then
                cmp.confirm({select = true})
            else
                cmp.confirm({select = true}, function()
                    vim.api.nvim_paste(" ", false, -1)
                end)
            end
        else
            fallback()
        end
    end, {'i', 's'}),