neovim-config/lua/plugins/configs/cmp.lua

local cmp = require("cmp")
local lspkind = require("lspkind")

cmp.setup({
	snippet = {
		expand = function(args)
			vim.fn["vsnip#anonymous"](args.body)
		end,
	},
	completion = { completeopt = "menu,menuone,noinsert", keyword_length = 1 },
	sources = {
		{ name = "nvim_lsp" },
		{ name = "nvim_lua" },
		{ name = "vsnip" },
		{ name = "buffer" },
		{ name = "path" },
		{ name = "crates" },
	},
	confirm_opts = {
		behavior = cmp.ConfirmBehavior.Replace,
		select = false,
	},
	window = {
		documentation = {
			border = { "╭", "─", "╮", "│", "╯", "─", "╰", "│" },
		},
	},
	experimental = {
		ghost_text = true,
		native_menu = false,
	},
	formatting = {
		fields = { "abbr", "kind", "menu" },
		format = lspkind.cmp_format({
			mode = "symbol_text",
			maxwidth = 50,
			before = function(entry, vim_item)
				vim_item.menu = ({
					nvim_lsp = "[LSP]",
					nvim_lua = "[NVIM_LUA]",
					vsnip = "[SNIPPET]",
					buffer = "[BUFFER]",
					path = "[PATH]",
				})[entry.source.name]
				return vim_item
			end,
		}),
	},
	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 = true }),
	}),
})