home: Use CLI::Parser to parse args

Library/Homebrew/cmd/home.rb

@@ -4,11 +4,27 @@
 #:  * `home` <formula>:
 #:    Open <formula>'s homepage in a browser.
 
+require "cli_parser"
+
 module Homebrew
   module_function
 
+  def home_args
+    Homebrew::CLI::Parser.new do
+      usage_banner <<~EOS
+        `home` [<formula>]
+
+        Open <formula>'s homepage in a browser. If no formula is provided,
+        open Homebrew's own homepage in a browser.
+      EOS
+      switch :debug
+    end
+  end
+
   def home
-    if ARGV.named.empty?
+    home_args.parse
+
+    if args.remaining.empty?
       exec_browser HOMEBREW_WWW
     else
       exec_browser(*ARGV.formulae.map(&:homepage))