nvim/lua/plugins/cmp.lua

local M = {
	'hrsh7th/nvim-cmp',
	-- lazy = false,
	dependencies = {
		{ 'honza/vim-snippets' },
		{ 'dcampos/nvim-snippy' },
		{ 'dcampos/cmp-snippy' },
		'hrsh7th/cmp-nvim-lsp',
		'hrsh7th/cmp-buffer',
		'hrsh7th/cmp-cmdline',
		'hrsh7th/cmp-path',
	},
	event = { 'InsertEnter', 'CmdlineEnter' },
	version = false,
}

function M.config()
	local kind_icons = {
		Text = '',
		Method = '',
		Function = '',
		Constructor = '',
		Field = '',
		Variable = '',
		Class = 'ﴯ',
		Interface = '',
		Module = '',
		Property = 'ﰠ',
		Unit = '',
		Value = '',
		Enum = '',
		Keyword = '',
		Snippet = '',
		Color = '',
		File = '',
		Reference = '',
		Folder = '',
		EnumMember = '',
		Constant = '',
		Struct = '',
		Event = '',
		Operator = '',
		TypeParameter = '',
	}
	local cmp = require 'cmp'

	local has_words_before = function()
		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

	cmp.setup {
		enabled = function()
			return vim.api.nvim_buf_get_option(0, 'buftype') ~= 'prompt' or require('cmp_dap').is_dap_buffer()
		end,
		view = {
			entries = {
				name = 'custom', -- can be "custom", "wildmenu" or "native"
				-- separator = ' | ',
			},
		},
		completion = {
			autocomplete = { 'TextChanged', 'CmdlineChanged', 'TextChangedP' },
			-- autocomplete = false,
		},
		snippet = {
			expand = function(args)
				require('snippy').expand_snippet(args.body)
			end,
		},
		window = {
			completion = cmp.config.window.bordered(),
			documentation = cmp.config.window.bordered(),
		},
		experimental = {
			ghost_text = true,
		},
		formatting = {
			fields = { 'abbr', 'kind', 'menu' },
			format = function(_, item)
				local ELLIPSIS_CHAR = '…'
				local MAX_LABEL_WIDTH = 20
				item.kind = string.format('%s %s', kind_icons[item.kind], item.kind) -- This concatonates the icons with the name of the item kind

				local label = item.abbr
				local truncated_label = vim.fn.strcharpart(label, 0, MAX_LABEL_WIDTH)
				if truncated_label ~= label then
					item.abbr = truncated_label .. ELLIPSIS_CHAR
				end
				return item
			end,
		},
		mapping = {
			['<C-k>'] = cmp.mapping.select_prev_item(),
			['<C-j>'] = cmp.mapping.select_next_item(),
			['<C-b>'] = cmp.mapping(cmp.mapping.scroll_docs(-4), { 'i', 'c' }),
			['<C-f>'] = cmp.mapping(cmp.mapping.scroll_docs(4), { 'i', 'c' }),
			['<C-Space>'] = cmp.mapping(cmp.mapping.complete(), { 'i', 'c' }),
			['<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 { behavior = cmp.SelectBehavior.Select }
				elseif require('snippy').can_expand_or_advance() then
					require('snippy').expand_or_advance()
				elseif has_words_before() then
					cmp.complete()
				else
					fallback()
				end
			end, { 'i', 's' }),

			['<S-Tab>'] = cmp.mapping(function(fallback)
				if cmp.visible() then
					cmp.select_prev_item { behavior = cmp.SelectBehavior.Insert }
				elseif require('snippy').can_jump(-1) then
					require('snippy').previous()
				else
					fallback()
				end
			end, { 'i', 's' }),
		},
		sources = {
			{ name = 'nvim_lsp' },
			{ name = 'snippy' },
			{ name = 'path' },
			{ name = 'buffer' },
		},
	}
	cmp.setup.cmdline(':', {
		completion = { autocomplete = { 'TextChanged' } },
		mapping = cmp.mapping.preset.cmdline(),
		sources = {
			{ name = 'cmdline' },
			{ name = 'path' },
		},
		-- view = {
		-- 	entries = { name = 'wildmenu', separator = ' · ' },
		-- },
	})

	cmp.setup.cmdline('/', {
		sources = {
			{ name = 'buffer' },
		},
		-- view = {
		-- 	entries = { name = 'wildmenu', separator = ' · ' },
		-- },
	})

	cmp.setup.filetype({ 'dap-repl', 'dapui_watches', 'dapui_hover' }, {
		sources = {
			{ name = 'dap' },
		},
	})
end

return M