elua: getopt api improvement

src/bin/elua/lualian.lua

@@ -4,7 +4,7 @@
 local lualian = require("lualian")
 local  getopt = require("getopt")
 
-local arg_parser = {
+local opts, args, arg_parser = getopt.parse {
     usage = "Usage: %prog [OPTIONS] file1.eo file2.eo ... fileN.eo",
     args  = arg, descs = {
         { "h", "help"   , false, help = "Show this message." },
@@ -23,8 +23,6 @@ local arg_parser = {
     }
 }
 
-local opts, args = getopt.parse(arg_parser)
-
 if not opts then
     io.stderr:write(args, "\n")
     getopt.help(arg_parser, io.stderr)

src/bin/elua/modules/getopt.lua

@@ -98,7 +98,7 @@ M.parse = function(parser)
     if not ret then
         return nil, opts
     end
-    return opts, args
+    return opts, args, parser
 end
 local parse = M.parse