nvim/lua/plugins/cmp.lua

return {
	'hrsh7th/nvim-cmp',
	dependencies = {
		'hrsh7th/cmp-nvim-lsp',
		'hrsh7th/cmp-path',
		'hrsh7th/cmp-buffer',
		'hrsh7th/cmp-calc',
		'hrsh7th/cmp-cmdline',
		'hrsh7th/cmp-nvim-lsp-signature-help',
		'saadparwaiz1/cmp_luasnip',
		'onsails/lspkind.nvim',
	},
	event = { 'InsertEnter', 'CmdlineEnter' },
	config = function()
		local cmp = require 'cmp'
		local lspkind = require 'lspkind'

		cmp.setup {
			snippet = {
				expand = function(args)
					require('luasnip').lsp_expand(args.body)
				end,
			},
			view = {
				entries = {
					name = 'custom', -- can be "custom", "wildmenu" or "native"
					-- separator = ' | ',
					selection_order = 'near_cursor',
				},
			},
			-- completion = {
			-- 	autocomplete = { 'TextChanged', 'CmdlineChanged', 'TextChangedP' },
			-- 	-- autocomplete = false,
			-- },
			window = {
				completion = cmp.config.window.bordered(),
				documentation = cmp.config.window.bordered(),
			},
			experimental = {
				ghost_text = {
					hl_group = { "Comment" },
				},
			},
			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(),
				['<Tab>'] = cmp.mapping(function(fallback)
					if cmp.visible() then
						cmp.select_next_item()
					else
						fallback()
					end
				end, { 'i', 's' }),
				['<S-Tab>'] = cmp.mapping(function(fallback)
					if cmp.visible() then
						cmp.select_prev_item()
					else
						fallback()
					end
				end, { 'i', 's' }),
				['<CR>'] = cmp.mapping.confirm { select = false },
			},
			sources = cmp.config.sources({
				{ name = 'luasnip' },
				{ name = 'nvim_lsp' },
				{ name = 'nvim_lsp_signature_help' },
			}, {
				{ name = 'path' },
				{ name = 'calc' },
				{ name = 'buffer' },
			}),
			formatting = {
				format = require 'lspkind'.cmp_format({
					mode = 'symbol_text', -- show only symbol annotations
					maxwidth = 50, -- prevent the popup from showing more than provided characters (e.g 50 will not show more than 50 characters)
					-- can also be a function to dynamically calculate max width such as
					-- maxwidth = function() return math.floor(0.45 * vim.o.columns) end,
					ellipsis_char = '...', -- when popup menu exceed maxwidth, the truncated part would show ellipsis_char instead (must define maxwidth first)
					show_labelDetails = true, -- show labelDetails in menu. Disabled by default

					-- The function below will be called before any actual modifications from lspkind
					-- so that you can provide more controls on popup customization. (See [#30](https://github.com/onsails/lspkind-nvim/pull/30))
					before = function(entry, vim_item)
						return vim_item
					end
				})
			},
		}

		cmp.setup.cmdline({ '/', '?' }, {
			mapping = cmp.mapping.preset.cmdline(),
			sources = {
				{ name = 'buffer' },
			},
		})

		cmp.setup.cmdline(':', {
			mapping = cmp.mapping.preset.cmdline(),
			sources = cmp.config.sources({
				{ name = 'path' },
			}, {
				{ name = 'cmdline' },
			}),
		})
	end,
}