neovim cmp config

cmp.lua

local cmp_status_ok, cmp = pcall(require, 'cmp')
if not cmp_status_ok then
  return
end

local snip_status_ok, luasnip = pcall(require, 'luasnip')
if not snip_status_ok then
  return
end

require('luasnip/loaders/from_vscode').lazy_load({ paths = { './snippets' } })

local has_words_before = function()
  unpack = unpack or table.unpack
  local line, col = unpack(vim.api.nvim_win_get_cursor(0))
  return col ~= 0 and vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match('%s') == nil
end

local check_backspace = function()
  local col = vim.fn.col('.') - 1
  return col == 0 or vim.fn.getline('.'):sub(col, col):match('%s')
end

cmp.setup({
  snippet = {
    expand = function(args)
      luasnip.lsp_expand(args.body) -- For `luasnip` users.
    end,
  },
  mapping = cmp.mapping.preset.insert({
    ['<C-k>'] = cmp.mapping.select_prev_item(),
    ['<C-j>'] = cmp.mapping.select_next_item(),
    ['<C-b>'] = cmp.mapping(cmp.mapping.scroll_docs(-1), { 'i', 'c' }),
    ['<C-f>'] = cmp.mapping(cmp.mapping.scroll_docs(1), { 'i', 'c' }),
    ['<C-Space>'] = cmp.mapping(cmp.mapping.complete(), { 'i', 'c' }),
    ['<C-e>'] = cmp.mapping({
      i = cmp.mapping.abort(),
      c = cmp.mapping.close(),
    }),
    -- Accept currently selected item. If none selected, `select` first item.
    -- Set `select` to `false` to only confirm explicitly selected items.
    ['<CR>'] = cmp.mapping.confirm({ select = true }),
    ['<Tab>'] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_next_item()
      elseif luasnip.expandable() then
        luasnip.expand()
      elseif luasnip.expand_or_jumpable() then
        luasnip.expand_or_jump()
      elseif has_words_before() then
        cmp.complete()
      elseif check_backspace() then
        fallback()
      else
        fallback()
      end
    end, {
      'i',
      's',
    }),
    ['<S-Tab>'] = cmp.mapping(function(fallback)
      if cmp.visible() then
        cmp.select_prev_item()
      elseif luasnip.jumpable(-1) then
        luasnip.jump(-1)
      else
        fallback()
      end
    end, {
      'i',
      's',
    }),
  }),
  sources = {
    { name = 'nvim_lsp' },
    { name = 'nvim_lua' },
    { name = 'luasnip' },
    { name = 'buffer' },
    { name = 'path' },
  },
  confirm_opts = {
    behavior = cmp.ConfirmBehavior.Replace,
    select = false,
  },
  window = {
    completion = cmp.config.window.bordered(),
    documentation = cmp.config.window.bordered(),
  },
  experimental = {
    ghost_text = true,
  },
  formatting = {
    format = require('lspkind').cmp_format({
      maxwidth = 50,
      with_text = true,
      ellipsis_char = '...',
      menu = {
        nvim_lsp = '[lsp]',
        luasnip = '[snip]',
        nvim_lua = '[nvim]',
        path = '[path]',
        rg = '[rg]',
        buffer = '[buf]',
        cmdline = '[cmd]',
      },
    }),
  },
})

-- Set configuration for specific filetype.
cmp.setup.filetype('gitcommit', {
  sources = cmp.config.sources({
    { name = 'git' }, -- You can specify the `git` source if [you were installed it](https://github.com/petertriho/cmp-git).
  }, {
    { 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' },
  }),
})