Port Homebrew::Cmd::Prefix

Library/Homebrew/cmd/--prefix.rb

@@ -1,12 +1,44 @@
 # typed: true
 # frozen_string_literal: true
 
-require "cli/parser"
+require "abstract_command"
+require "fileutils"
 
 module Homebrew
-  sig { returns(CLI::Parser) }
+  module Cmd
-  def self.__prefix_args
+    class Prefix < AbstractCommand
-    Homebrew::CLI::Parser.new do
+      include FileUtils
+
+      UNBREWED_EXCLUDE_FILES = %w[.DS_Store].freeze
+      UNBREWED_EXCLUDE_PATHS = %w[
+        */.keepme
+        .github/*
+        bin/brew
+        completions/zsh/_brew
+        docs/*
+        lib/gdk-pixbuf-2.0/*
+        lib/gio/*
+        lib/node_modules/*
+        lib/python[23].[0-9]/*
+        lib/python3.[0-9][0-9]/*
+        lib/pypy/*
+        lib/pypy3/*
+        lib/ruby/gems/[12].*
+        lib/ruby/site_ruby/[12].*
+        lib/ruby/vendor_ruby/[12].*
+        manpages/brew.1
+        share/pypy/*
+        share/pypy3/*
+        share/info/dir
+        share/man/whatis
+        share/mime/*
+        texlive/*
+      ].freeze
+
+      sig { override.returns(String) }
+      def self.command_name = "--prefix"
+
+      cmd_args do
         description <<~EOS
           Display Homebrew's install path. *Default:*
 
@@ -24,11 +56,9 @@ module Homebrew
 
         named_args :formula
       end
-  end
-
-  def self.__prefix
-    args = __prefix_args.parse
 
+      sig { override.void }
+      def run
         raise UsageError, "`--installed` requires a formula argument." if args.installed? && args.no_named?
 
         if args.unbrewed?
@@ -59,33 +89,9 @@ module Homebrew
         end
       end
 
-  UNBREWED_EXCLUDE_FILES = %w[.DS_Store].freeze
+      private
-  UNBREWED_EXCLUDE_PATHS = %w[
-    */.keepme
-    .github/*
-    bin/brew
-    completions/zsh/_brew
-    docs/*
-    lib/gdk-pixbuf-2.0/*
-    lib/gio/*
-    lib/node_modules/*
-    lib/python[23].[0-9]/*
-    lib/python3.[0-9][0-9]/*
-    lib/pypy/*
-    lib/pypy3/*
-    lib/ruby/gems/[12].*
-    lib/ruby/site_ruby/[12].*
-    lib/ruby/vendor_ruby/[12].*
-    manpages/brew.1
-    share/pypy/*
-    share/pypy3/*
-    share/info/dir
-    share/man/whatis
-    share/mime/*
-    texlive/*
-  ].freeze
 
-  def self.list_unbrewed
+      def list_unbrewed
         dirs  = HOMEBREW_PREFIX.subdirs.map { |dir| dir.basename.to_s }
         dirs -= %w[Library Cellar Caskroom .git]
 
@@ -104,3 +110,5 @@ module Homebrew
         cd(HOMEBREW_PREFIX) { safe_system("find", *arguments) }
       end
     end
+  end
+end

Library/Homebrew/test/cmd/--prefix_spec.rb

@@ -1,8 +1,9 @@
 # frozen_string_literal: true
 
+require "cmd/--prefix"
 require "cmd/shared_examples/args_parse"
 
-RSpec.describe "brew --prefix" do
+RSpec.describe Homebrew::Cmd::Prefix do
   it_behaves_like "parseable arguments"
 
   it "prints Homebrew's prefix", :integration_test do