Port Homebrew::Cmd::Env

Library/Homebrew/cmd/--env.rb

@@ -1,17 +1,18 @@
 # typed: strict
 # frozen_string_literal: true
 
+require "abstract_command"
 require "extend/ENV"
 require "build_environment"
 require "utils/shell"
-require "cli/parser"
 
 module Homebrew
-  module_function
+  module Cmd
+    class Env < AbstractCommand
+      sig { override.returns(String) }
+      def self.command_name = "--env"
 
-  sig { returns(CLI::Parser) }
+      cmd_args do
-  def __env_args
-    Homebrew::CLI::Parser.new do
         description <<~EOS
           Summarise Homebrew's build environment as a plain list.
 
@@ -26,12 +27,9 @@ module Homebrew
 
         named_args :formula
       end
-  end
-
-  sig { void }
-  def __env
-    args = __env_args.parse
 
+      sig { override.void }
+      def run
         ENV.activate_extensions!
         ENV.deps = args.named.to_formulae if superenv?(nil)
         ENV.setup_build_environment
@@ -43,7 +41,7 @@ module Homebrew
         elsif args.shell == "auto"
           Utils::Shell.parent || Utils::Shell.preferred
         elsif args.shell
-      Utils::Shell.from_path(args.shell)
+          Utils::Shell.from_path(T.must(args.shell))
         end
 
         if shell.nil?
@@ -54,4 +52,6 @@ module Homebrew
           end
         end
       end
+    end
+  end
 end

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

@@ -1,8 +1,9 @@
 # frozen_string_literal: true
 
+require "cmd/--env"
 require "cmd/shared_examples/args_parse"
 
-RSpec.describe "brew --env" do
+RSpec.describe Homebrew::Cmd::Env do
   it_behaves_like "parseable arguments"
 
   describe "--shell=bash", :integration_test do