Need help to run shell command before start debugging

[alloc33]

I configured nvim-dap for swift code debugging. However I need to be able to build my swift project each time automatically before I start debugger. (Can do it manually with swift build command, but need automatically)

How can I add swift build command so codelldb will wait until it finished?

Here is my setup:

local libLLDB = require("settings").libLLDB

local cmd = "/Users/nshv/.vscode/extensions/vadimcn.vscode-lldb-1.7.0/adapter/codelldb"

dap.adapters.codelldb = function(on_adapter)
	-- This asks the system for a free port
	local tcp = vim.loop.new_tcp()
	tcp:bind("127.0.0.1", 0)
	local port = tcp:getsockname().port
	tcp:shutdown()
	tcp:close()

	-- Start codelldb with the port
	local stdout = vim.loop.new_pipe(false)
	local stderr = vim.loop.new_pipe(false)
	local opts = {
		stdio = { nil, stdout, stderr },
		args = { "--liblldb", libLLDB, "--port", tostring(port) }
	}
	local handle
	local pid_or_err
	handle, pid_or_err = vim.loop.spawn(
		cmd,
		opts,
		function(code)
			stdout:close()
			stderr:close()
			handle:close()
			if code ~= 0 then
				print("codelldb exited with code", code)
			end
		end
	)
	if not handle then
		vim.notify("Error running codelldb: " .. tostring(pid_or_err), vim.log.levels.ERROR)
		stdout:close()
		stderr:close()
		return
	end
	vim.notify("codelldb started. pid=" .. pid_or_err)
	stderr:read_start(
		function(err, chunk)
			assert(not err, err)
			if chunk then
				vim.schedule(
					function()
						require("dap.repl").append(chunk)
					end
				)
			end
		end
	)
	local adapter = {
		type = "server",
		host = "127.0.0.1",
		port = port
	}
	-- 💀
	-- Wait for codelldb to get ready and start listening before telling nvim-dap to connect
	-- If you get connect errors, try to increase 500 to a higher value, or check the stderr (Open the REPL)
	vim.defer_fn(
		function()
			on_adapter(adapter)
		end,
		800
	)
end

dap.configurations.swift = {
	{
		type = "codelldb",
		request = "launch",
		name = "DEBUG",
		program = function()
			return "${workspaceFolder}/.build/debug/" .. vim.fn.substitute(vim.fn.getcwd(), '^.*/', '', '')
		end,
		cwd = "${workspaceFolder}",
		liblldb = libLLDB,
		stopOnEntry = false,
	},
}

[mfussenegger]

You could use something like this:

dap.configurations.swift = {
  {
    type = "codelldb",
    request = "launch",
    name = "DEBUG",
    program = function()
      vim.fn.system("swift build")
      return "${workspaceFolder}/.build/debug/" .. vim.fn.substitute(vim.fn.getcwd(), '^.*/', '', '')
    end,
    cwd = "${workspaceFolder}",
    liblldb = libLLDB,
    stopOnEntry = false,
    },
}