return function(cmp)
    return cmp.mapping.preset.insert({
        ['<C-b>'] = cmp.mapping.scroll_docs(-4),
        ['<C-f>'] = cmp.mapping.scroll_docs(4),
        ['<c-space>'] = cmp.mapping.complete(),
        ['<c-e>'] = cmp.mapping.abort(),
        ['<cr>'] = cmp.mapping.confirm({ select = true }),
        ['<tab>'] = cmp.mapping.select_next_item(),
    })
end