neovim-config/lua/user/cmp.lua

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

local npm_status_ok, npm = pcall(require, "cmp-npm")
if not npm_status_ok then
	return
end

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

local lspkind_status_ok, lspkind = pcall(require, "lspkind")
if not lspkind_status_ok then
	return
end

require("luasnip/loaders/from_vscode").lazy_load()

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

npm.setup({})

cmp.setup({
	completion = { completeopt = "menu,menuone,noinsert", keyword_length = 1 },
	snippet = {
		expand = function(args)
			luasnip.lsp_expand(args.body)
		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" }),
		["<C-y>"] = cmp.config.disable,
		["<C-e>"] = cmp.mapping({
			i = cmp.mapping.abort(),
			c = cmp.mapping.close(),
		}),
		["<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 = { "abbr", "kind", "menu" },
		format = lspkind.cmp_format({
			mode = "symbol_text",
			maxwidth = 50,
			before = function(entry, vim_item)
				vim_item.menu = ({
					nvim_lsp = "[LSP]",
					npm = "[NPM]",
					crates = "[CRATES]",
					nvim_lua = "[NVIM_LUA]",
					luasnip = "[SNIPPET]",
					buffer = "[BUFFER]",
					path = "[PATH]",
				})[entry.source.name]
				return vim_item
			end,
		}),
	},
	sources = {
		{ name = "nvim_lsp" },
		{ name = "npm" },
		{ name = "crates" },
		{ name = "nvim_lua" },
		{ name = "luasnip" },
		{ name = "buffer" },
		{ name = "path" },
	},
	confirm_opts = {
		behavior = cmp.ConfirmBehavior.Replace,
		select = false,
	},
	window = {
		documentation = {
			border = { "╭", "─", "╮", "│", "╯", "─", "╰", "│" },
		},
	},
	experimental = {
		ghost_text = true,
		native_menu = false,
	},
})

cmp.setup.cmdline("/", {
	sources = {
		{ name = "buffer" },
	},
})

cmp.setup.cmdline(":", {
	sources = cmp.config.sources({
		{ name = "path" },
	}, {
		{ name = "cmdline" },
	}),
})