nvim-config/after/plugin/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

-- Not sure if this just works or needs vscode to be installed. This came from
-- the same place as the snippet below.
require("luasnip/loaders/from_vscode").lazy_load()

-- This function, along with most of the code in this file, was copied from
-- LunarVim/Neovim-from-scratch branch: 05-completion, commit: a0e07fc
-- I'm not 100% sure what it does, it has something to do with "supertab" for
-- snippets, autocomplete, and normal mode.
local check_backspace = function()
  local col = vim.fn.col "." - 1
  return col == 0 or vim.fn.getline("."):sub(col, col):match "%s"
end

--   פּ ﯟ   some other good icons
local kind_icons = {
  Text = "",
  Method = "m",
  Function = "",
  Constructor = "",
  Field = "",
  Variable = "",
  Class = "",
  Interface = "",
  Module = "",
  Property = "",
  Unit = "",
  Value = "",
  Enum = "",
  Keyword = "",
  Snippet = "",
  Color = "",
  File = "",
  Reference = "",
  Folder = "",
  EnumMember = "",
  Constant = "",
  Struct = "",
  Event = "",
  Operator = "",
  TypeParameter = "",
  Copilot = "",
}
-- find more here: https://www.nerdfonts.com/cheat-sheet

cmp.setup {
  snippet = {
    expand = function(args)
      luasnip.lsp_expand(args.body) -- For `luasnip` users.
    end,
  },
  mapping = {
    ["<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" }),
    -- Specify `cmp.config.disable` if you want to remove the default `<C-y>`
    -- mapping.
    ["<C-y>"] = cmp.config.disable,
    ["<C-e>"] = cmp.mapping {
      i = cmp.mapping.abort(),
      c = cmp.mapping.close(),
    },
    ['<C-x>'] = cmp.mapping(
      cmp.mapping.complete({
        config = {
          sources = cmp.config.sources({
            { name = 'cmp_ai' },
          }),
        },
      }),
      { 'i' }
    ),
    -- 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 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",
    }),
  },
  formatting = {
    fields = { "kind", "abbr", "menu" },
    format = function(entry, vim_item)
      -- Kind icons
      -- TODO Need to make icons toggleable,
      vim_item.kind = string.format("%s", kind_icons[vim_item.kind])
      -- vim_item.kind = string.format('%s %s', kind_icons[vim_item.kind], vim_item.kind) -- This concatonates the icons with the name of the item kind
      vim_item.menu = ({
        copilot = "[Copilot]",
        cmp_ai = "[AI]",
        nvim_lsp = "[LSP]",
        nvim_lua = "[NVIM_LUA]",
        luasnip = "[Snippet]",
        buffer = "[Buffer]",
        path = "[Path]",
      })[entry.source.name]
      return vim_item
    end,
  },
  sources = {
    { name = "copilot" },
    -- Uncomment to run on every keystroke.
    -- { name = "cmp_ai" },
    { name = "nvim_lsp" },
    { name = "nvim_lua" },
    { name = "buffer" },
    { name = "path" },
    { name = "luasnip" },
  },
  confirm_opts = {
    behavior = cmp.ConfirmBehavior.Replace,
    select = false,
  },
  window = {
    documentation = cmp.config.window.bordered()
  },
  experimental = {
    ghost_text = true,
    native_menu = false,
  },
}