lua << EOF

-- Setup nvim-cmp.
  local cmp = require'cmp'

  cmp.setup({
    snippet = {
      expand = function(args)
        -- For `vsnip` user.
        vim.fn["vsnip#anonymous"](args.body) -- For `vsnip` user.

        -- For `luasnip` user.
        -- require('luasnip').lsp_expand(args.body)

        -- For `ultisnips` user.
        vim.fn["UltiSnips#Anon"](args.body)
      end,
    },
    mapping = {
      ['<C-d>'] = cmp.mapping.scroll_docs(-4),
      ['<C-f>'] = cmp.mapping.scroll_docs(4),
      ['<C-Space>'] = cmp.mapping.complete(),
      ['<C-e>'] = cmp.mapping.close(),
      ['<CR>'] = cmp.mapping.confirm({ select = true }),
    },
    sources = {
      { name = 'nvim_lsp' },

      { name = 'path' },

      { name = 'ultisnips' },

      { name = 'buffer' },

      { name = 'calc' },
    }
  })
EOF