nvim_cmp.lua

-- Set up nvim-cmp.
local cmp = require'cmp'

cmp.setup({
  snippet = {
    expand = function(args)
      require('luasnip').lsp_expand(args.body) -- For `luasnip` users.
    end,
  },
  window = {
    -- completion = cmp.config.window.bordered(),
    -- documentation = cmp.config.window.bordered(),
  },
  mapping = 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 = false }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
  }),
  sources = cmp.config.sources({
    { name = 'nvim_lsp' },
    { name = 'luasnip' },
  }, {
    { name = 'buffer' },
  })
})

-- Use buffer source for `/` and `?` (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline({ '/', '?' }, {
  mapping = cmp.mapping.preset.cmdline(),
  sources = {
    { name = 'buffer' }
  }
})

-- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline(':', {
  mapping = cmp.mapping.preset.cmdline(),
  sources = cmp.config.sources({
    { name = 'path' }
  }, {
    { name = 'cmdline' }
  })
})

-- Set up lspconfig.
vim.lsp.enable('standardrb')
vim.lsp.enable('lua_ls')

vim.o.updatetime = 250
vim.api.nvim_create_autocmd({ 'CursorHold', 'CursorHoldI' }, {
  group = vim.api.nvim_create_augroup('float_diagnostic', { clear = true }),
  callback = function ()
    vim.diagnostic.open_float(nil, {focus=false})
  end
})

vim.diagnostic.config({
  virtual_text = false,
  signs = true,
  underline = true,
  update_in_insert = false,
  severity_sort = false,
})