nvim-cmp-config.lua

local cmp = require('cmp')
local lspkind = require('lspkind')

local t = function(str)
  return vim.api.nvim_replace_termcodes(str, true, true, true)
end

local fk = vim.api.nvim_feedkeys
vim.g.copilot_no_tab_map = true
vim.g.copilot_assume_mapped = true
vim.g.copilot_tab_fallback = ""

cmp.setup {
  snippet = { expand = function(args) vim.fn['UltiSnips#Anon'](args.body) end },
  formatting = {
    -- format = lspkind.cmp_format({ mode = 'symbol_text' })
    format = function(entry, vim_item)
      vim_item.kind = lspkind.symbolic(vim_item.kind, { mode = "symbol_text" })
      vim_item.menu = entry.source.name
      if entry.source.name == "cmp_tabnine" then
        local detail = (entry.completion_item.data or {}).detail
        vim_item.kind = ""
        if detail and detail:find('.*%%.*') then
          vim_item.kind = vim_item.kind .. ' ' .. detail
        end

        if (entry.completion_item.data or {}).multiline then
          vim_item.kind = vim_item.kind .. ' ' .. '[ML]'
        end
      elseif entry.source.name == "nvim_lsp" then
        vim_item.kind = lspkind.symbolic(vim_item.kind, { mode = "symbol_text" })
      end
      local maxwidth = 80
      vim_item.abbr = string.sub(vim_item.abbr, 1, maxwidth)
      return vim_item
    end,
  },
  -- preselect = cmp.PreselectMode.Item,
  mapping = {
    ['<Tab>'] = cmp.mapping({
      i = function(fallback)
        if cmp.visible() then
          cmp.select_next_item({ behavior = cmp.SelectBehavior.Insert })
        elseif vim.fn['UltiSnips#CanJumpForwards']() == 1 then
          fk(t('<Plug>(ultisnips_jump_forward)'), 'm', true)
        else
          fallback()
        end
      end,
      s = function(fallback)
        if vim.fn['UltiSnips#CanJumpForwards']() == 1 then
          fk(t('<Plug>(ultisnips_jump_forward)'), 'm', true)
        else
          fallback()
        end
      end,
    }),
    ['<S-Tab>'] = cmp.mapping({
      i = function(fallback)
        if cmp.visible() then
          cmp.select_prev_item({ behavior = cmp.SelectBehavior.Insert })
        elseif vim.fn['UltiSnips#CanJumpBackwards']() == 1 then
          fk(t('<Plug>(ultisnips_jump_backward)'), 'm', true)
        else
          fallback()
        end
      end,
      s = function(fallback)
        if vim.fn['UltiSnips#CanJumpBackwards']() == 1 then
          fk(t('<Plug>(ultisnips_jump_backward)'), 'm', true)
        else
          fallback()
        end
      end,
    }),
    ['<C-b>'] = cmp.mapping(cmp.mapping.scroll_docs(-4), { 'i', 'c' }),
    ['<C-f>'] = cmp.mapping(cmp.mapping.scroll_docs(4), { 'i', 'c' }),
    ['<C-space>'] = cmp.mapping(cmp.mapping.complete(), { 'i', 'c' }),
    ['<C-y>'] = cmp.config.disable,
    ['<C-e>'] = cmp.mapping({ i = cmp.mapping.abort(), c = cmp.mapping.close() }),
    ['<C-k>'] = cmp.mapping.confirm({ select = true }),
    ["<C-j>"] = cmp.mapping(function(fallback)
      cmp.mapping.abort()
      local copilot_keys = vim.fn["copilot#Accept"]()
      if copilot_keys ~= "" then
        vim.api.nvim_feedkeys(copilot_keys, "i", true)
      else
        fallback()
      end
    end),
  },
  sources = cmp.config.sources({
    -- { name = 'cmp_tabnine', group_index = 2 },
    { name = 'ultisnips' },
    -- { name = 'emoji' },
    { name = 'nvim_lsp_signature_help' },
    { name = 'nvim_lsp',               max_item_count = 10, priority = 100 },
    { name = 'buffer',                 max_item_count = 5,  priority = 10 }
  }),
  confirm_opts = {
    behavior = cmp.ConfirmBehavior.Replace,
    select = false,
  },
  window = {
    documentation = {
      border = "rounded",
      winhighlight = "NormalFloat:Pmenu,NormalFloat:Pmenu,CursorLine:PmenuSel,Search:None",
    },
    completion = {
      border = "rounded",
      winhighlight = "NormalFloat:Pmenu,NormalFloat:Pmenu,CursorLine:PmenuSel,Search:None",
    },
  },
  experimental = {
    ghost_text = true,
  },
}

vim.api.nvim_set_keymap('i', '<C-s>',
  [[<Cmd>lua require'cmp'.complete({ config = { sources = { { name = 'ultisnips' } } } })<CR>]],
  { noremap = true, silent = true })


--GistID: e1d1a276c4746fc034a2eb6bb2a594db