nvim/lua/plugins/lsp/init.lua

local M = {
	'neovim/nvim-lspconfig',
	name = 'lsp',
	event = { 'BufRead', 'BufNewFile' },
	-- lazy = false,
	dependencies = { 'hrsh7th/cmp-nvim-lsp', 'williamboman/mason-lspconfig.nvim' },
}

local function has_formatter(ft)
	local sources = require 'null-ls.sources'
	local available = sources.get_available(ft, 'NULL_LS_FORMATTING')
	return #available > 0
end

function M.config()
	require('mason-lspconfig').setup {
		automatic_installation = false,
	}

	local opts = {}
	local cmp_nvim_lsp = require 'cmp_nvim_lsp'
	local capabilities = vim.lsp.protocol.make_client_capabilities()
	capabilities.textDocument.completion.completionItem.snippetSupport = true
	capabilities = cmp_nvim_lsp.default_capabilities(capabilities)

	local function lsp_keymaps(bufnr)
		local opt = { noremap = true, silent = true }
		local keymap = vim.api.nvim_buf_set_keymap
		keymap(bufnr, 'n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>', opt)
		keymap(bufnr, 'n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>', opt)
		keymap(bufnr, 'n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', opt)
		keymap(bufnr, 'n', 'gI', '<cmd>lua vim.lsp.buf.implementation()<CR>', opt)
		keymap(bufnr, 'n', 'gr', '<cmd>TroubleToggle lsp_references<CR>', opt)
		keymap(bufnr, 'n', 'gl', '<cmd>lua vim.diagnostic.open_float()<CR>', opt)
		keymap(bufnr, 'n', '<leader>lf', '<cmd>lua vim.lsp.buf.format { async = true }<cr>', opt)
		keymap(bufnr, 'n', '<leader>li', '<cmd>LspInfo<cr>', opt)
		keymap(bufnr, 'n', '<leader>lI', '<cmd>LspInstallInfo<cr>', opt)
		keymap(bufnr, 'n', '<leader>la', '<cmd>lua vim.lsp.buf.code_action()<cr>', opt)
		keymap(bufnr, 'n', '<leader>lj', '<cmd>lua vim.diagnostic.goto_next({buffer=0})<cr>', opt)
		keymap(bufnr, 'n', '<leader>lk', '<cmd>lua vim.diagnostic.goto_prev({buffer=0})<cr>', opt)
		keymap(bufnr, 'n', '<leader>lr', '<cmd>lua vim.lsp.buf.rename()<cr>', opt)
		keymap(bufnr, 'n', '<leader>ls', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opt)
		keymap(bufnr, 'n', '<leader>lq', '<cmd>lua vim.diagnostic.setloclist()<CR>', opt)
		keymap(bufnr, 'n', '<leader>e', '<cmd>lua vim.diagnostic.open_float()<CR>', opt)
	end

	local on_attach = function(client, bufnr)
		--[[ vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc') ]]
		lsp_keymaps(bufnr)
		if client.name == 'jdt.ls' then
			client.server_capabilities.documentFormattingProvider = false
			vim.lsp.codelens.refresh()
			if JAVA_DAP_ACTIVE then
				require('jdtls').setup_dap { hotcodereplace = 'auto' }
				require('jdtls.dap').setup_dap_main_class_configs()
			end
		end
		local ft = vim.api.nvim_buf_get_option(bufnr, 'filetype')

		local enable = false
		if has_formatter(ft) then
			enable = client.name == 'null-ls'
		else
			enable = not (client.name == 'null-ls')
		end

		-- util.info(client.name .. " " .. (enable and "yes" or "no"), "format")
		client.server_capabilities.documentFormattingProvider = enable
	end

	require('mason-lspconfig').setup_handlers {
		function(server) -- default handler (optional)
			opts = {
				on_attach = on_attach,
				capabilities = capabilities,
			}

			if server == 'sumneko_lua' or server == 'lua_ls' then
				local sumneko_opts = require 'plugins.lsp.settings.sumneko_lua'
				opts = vim.tbl_deep_extend('force', sumneko_opts, opts)
			end
			if server == 'clangd' then
				local clangd_flags = {
					'-j=5',
					'--all-scopes-completion',
					'--suggest-missing-includes',
					'--background-index',
					'--pch-storage=disk',
					'--cross-file-rename',
					'--log=info',
					'--completion-style=detailed',
					'--enable-config', -- clangd 11+ supports reading from .clangd configuration file
					'--clang-tidy',
					-- "--clang-tidy-checks=-*,llvm-*,clang-analyzer-*,modernize-*,-modernize-use-trailing-return-type",
					-- "--fallback-style=Google",
					-- "--header-insertion=never",
					-- "--query-driver=<list-of-white-listed-complers>"
				}
				local clang_opts = {
					arg = { unpack(clangd_flags) },
				}
				opts = vim.tbl_deep_extend('force', clang_opts, opts)
			end
			if server == 'jdtls' then
				vim.cmd "command! -buffer -nargs=? -complete=custom,v:lua.require'jdtls'._complete_compile JdtCompile lua require('jdtls').compile(<f-args>)"
				vim.cmd "command! -buffer -nargs=? -complete=custom,v:lua.require'jdtls'._complete_set_runtime JdtSetRuntime lua require('jdtls').set_runtime(<f-args>)"
				vim.cmd "command! -buffer JdtUpdateConfig lua require('jdtls').update_project_config()"
				-- vim.cmd "command! -buffer JdtJol lua require('jdtls').jol()"
				vim.cmd "command! -buffer JdtBytecode lua require('jdtls').javap()"
				-- vim.cmd "command! -buffer JdtJshell lua require('jdtls').jshell()"
				goto continue
			end
			require('lspconfig')[server].setup(opts)
			::continue::
		end,
	}

	local config = {
		virtual_text = {
			prefix = '●',
		},
		signs = false,
		underline = true,
		update_in_insert = true,
		severity_sort = false,
		float = {
			focusable = false,
			-- style = 'minimal',
			border = 'rounded',
			source = 'always',
			header = '',
			prefix = '',
		},
	}
	vim.diagnostic.config(config)

	vim.lsp.handlers['textDocument/hover'] = vim.lsp.with(vim.lsp.handlers.hover, {
		border = 'rounded',
	})

	vim.lsp.handlers['textDocument/signatureHelp'] = vim.lsp.with(vim.lsp.handlers.signature_help, {
		border = 'rounded',
	})

	local on_references = vim.lsp.handlers['textDocument/references']
	vim.lsp.handlers['textDocument/references'] = vim.lsp.with(on_references, {
		-- Use location list instead of quickfix list
		loclist = true,
	})
end

return M