nvim-config/lua/cmp-setup.lua

-- [[ Configure nvim-cmp ]]
-- See `:help cmp`
local cmp = require 'cmp'
local luasnip = require 'luasnip'
require('luasnip.loaders.from_vscode').lazy_load()
luasnip.config.setup {}

cmp.setup {
  snippet = {
    expand = function(args)
      luasnip.lsp_expand(args.body)
    end,
  },
  completion = { completeopt = 'menu,menuone,noinsert' },

  -- For an understanding of why these mappings were
  -- chosen, you will need to read `:help ins-completion`
  --
  -- No, but seriously. Please read `:help ins-completion`, it is really good!
  mapping = cmp.mapping.preset.insert {
    -- Select the [n]ext item
    ['<C-n>'] = cmp.mapping.select_next_item(),
    -- Select the [p]revious item
    ['<C-p>'] = cmp.mapping.select_prev_item(),

    -- Accept ([y]es) the completion.
    --  This will auto-import if your LSP supports it.
    --  This will expand snippets if the LSP sent a snippet.
    ['<C-y>'] = cmp.mapping.confirm { select = true },

    ['<C-b>'] = cmp.mapping.scroll_docs(-4),
    ['<C-f>'] = cmp.mapping.scroll_docs(4),


    -- Manually trigger a completion from nvim-cmp.
    --  Generally you don't need this, because nvim-cmp will display
    --  completions whenever it has completion options available.
    ['<C-Space>'] = cmp.mapping.complete {},

    ['<CR>'] = cmp.mapping.confirm {
      behavior = cmp.ConfirmBehavior.Replace,
      select = true,
    },
    ['<Tab>'] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_next_item()
      elseif luasnip.expand_or_locally_jumpable() then
        luasnip.expand_or_jump()
      else
        fallback()
      end
    end, { 'i', 's' }),
    ['<S-Tab>'] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_prev_item()
      elseif luasnip.locally_jumpable(-1) then
        luasnip.jump(-1)
      else
        fallback()
      end
    end, { 'i', 's' }),

    -- Think of <c-l> as moving to the right of your snippet expansion.
    --  So if you have a snippet that's like:
    --  function $name($args)
    --    $body
    --  end
    --
    -- <c-l> will move you to the right of each of the expansion locations.
    -- <c-h> is similar, except moving you backwards.
    ['<C-l>'] = cmp.mapping(function()
      if luasnip.expand_or_locally_jumpable() then
        luasnip.expand_or_jump()
      end
    end, { 'i', 's' }),
    ['<C-h>'] = cmp.mapping(function()
      if luasnip.locally_jumpable(-1) then
        luasnip.jump(-1)
      end
    end, { 'i', 's' }),
  },
  sources = {
    { name = 'nvim_lsp' },
    { name = 'luasnip' },
    { name = 'path' },
  },
}

-- vim: ts=2 sts=2 sw=2 et