1local cmp = require 'cmp'
 2local luasnip = require 'luasnip'
 3
 4local has_words_before = function()
 5  local line, col = unpack(vim.api.nvim_win_get_cursor(0))
 6  return col ~= 0 and vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match("%s") == nil
 7end
 8
 9cmp.setup({
10  snippet = {
11    expand = function(args)
12      require('luasnip').lsp_expand(args.body)
13    end
14  },
15  window = {
16    completion = cmp.config.window.bordered(),
17    documentation = cmp.config.window.bordered(),
18  },
19  mapping = cmp.mapping.preset.insert({
20    ['<C-b>'] = cmp.mapping.scroll_docs(-4),
21    ['<C-f>'] = cmp.mapping.scroll_docs(4),
22    ['<C-Space>'] = cmp.mapping.complete(),
23    ['<C-e>'] = cmp.mapping.abort(),
24    ['<CR>'] = cmp.mapping.confirm({ select = true }),
25    ["<Tab>"] = cmp.mapping(function(fallback)
26      if cmp.visible() then
27        cmp.select_next_item()
28      elseif luasnip.expand_or_jumpable() then
29        luasnip.expand_or_jump()
30      elseif has_words_before() then
31        cmp.complete()
32      else
33        fallback()
34      end
35    end, { "i", "s" }),
36
37    ["<S-Tab>"] = cmp.mapping(function(fallback)
38      if cmp.visible() then
39        cmp.select_prev_item()
40      elseif luasnip.jumpable(-1) then
41        luasnip.jump(-1)
42      else
43        fallback()
44      end
45    end, { "i", "s" }),
46
47  }),
48  sources = cmp.config.sources({
49    { name = 'nvim_lsp' },
50    { name = 'luasnip' },
51    { name = 'path' },
52    { name = 'buffer' },
53  })
54})
55
56cmp.setup.cmdline('/', {
57  mapping = cmp.mapping.preset.cmdline(),
58  sources = {
59    { name = 'buffer' },
60    { name = 'luasnip' }
61  }
62})
63
64cmp.setup.cmdline(':', {
65  mapping = cmp.mapping.preset.cmdline(),
66  sources = cmp.config.sources({
67    { name = 'path' }
68  }, {
69    { name = 'cmdline' }
70  })
71})
72
73local capabilities = require('cmp_nvim_lsp').update_capabilities(vim.lsp.protocol.make_client_capabilities())
74require('lspconfig')['gopls'].setup {
75  capabilities = capabilities
76}
77