lualoader: Pull argument extraction for cli functions into cli.arguments

This will be the translation layer for varargs -> cmd_name, argv for cli
commands. We reserve the right to break exactly what the varargs inclulde,
but this gives us a stable way to pull the arguments out of varargs.

stand/lua/cli.lua

@@ -67,9 +67,7 @@ end
 -- Globals
 
 function boot(...)
-	local argv = {...}
-	local cmd_name = ""
-	cmd_name, argv = core.popFrontTable(argv)
+	local cmd_name, argv = cli.arguments(...)
 	local kernel, argstr = parse_boot_args(argv)
 	if kernel ~= nil then
 		loader.perform("unload")
@@ -79,9 +77,7 @@ function boot(...)
 end
 
 function autoboot(...)
-	local argv = {...}
-	local cmd_name = ""
-	cmd_name, argv = core.popFrontTable(argv)
+	local cmd_name, argv = cli.arguments(...)
 	local argstr = parse_boot_args(argv, false)
 	core.autoboot(argstr)
 end
@@ -111,4 +107,13 @@ function cli_execute(...)
 
 end
 
+-- Module exports
+
+function cli.arguments(...)
+	local argv = {...}
+	local cmd_name = ""
+	cmd_name, argv = core.popFrontTable(argv)
+	return cmd_name, argv
+end
+
 return cli