config: Use CLI::Parser to parse args

Library/Homebrew/cmd/config.rb

@@ -4,11 +4,28 @@
 #:    provide it.
 
 require "system_config"
+require "cli_parser"
 
 module Homebrew
   module_function
 
+  def config_args
+    Homebrew::CLI::Parser.new do
+      usage_banner <<~EOS
+        `config`
+
+        Show Homebrew and system configuration useful for debugging. If you file
+        a bug report, you will likely be asked for this information if you do not
+        provide it.
+      EOS
+      switch :verbose
+      switch :debug
+    end
+  end
+
   def config
+    config_args.parse
+    raise UsageError unless args.remaining.empty?
     SystemConfig.dump_verbose_config
   end
 end