Port Homebrew::Cmd::Env

Library/Homebrew/cmd/--env.rb

@@ -1,56 +1,56 @@
 # 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) }
-  def __env_args
-    Homebrew::CLI::Parser.new do
-      description <<~EOS
-        Summarise Homebrew's build environment as a plain list.
+      cmd_args do
+        description <<~EOS
+          Summarise Homebrew's build environment as a plain list.
 
-        If the command's output is sent through a pipe and no shell is specified,
-        the list is formatted for export to `bash`(1) unless `--plain` is passed.
-      EOS
-      flag   "--shell=",
-             description: "Generate a list of environment variables for the specified shell, " \
-                          "or `--shell=auto` to detect the current shell."
-      switch "--plain",
-             description: "Generate plain output even when piped."
+          If the command's output is sent through a pipe and no shell is specified,
+          the list is formatted for export to `bash`(1) unless `--plain` is passed.
+        EOS
+        flag   "--shell=",
+               description: "Generate a list of environment variables for the specified shell, " \
+                            "or `--shell=auto` to detect the current shell."
+        switch "--plain",
+               description: "Generate plain output even when piped."
 
-      named_args :formula
-    end
-  end
+        named_args :formula
+      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
 
-    ENV.activate_extensions!
-    ENV.deps = args.named.to_formulae if superenv?(nil)
-    ENV.setup_build_environment
+        shell = if args.plain?
+          nil
+        elsif args.shell.nil?
+          :bash unless $stdout.tty?
+        elsif args.shell == "auto"
+          Utils::Shell.parent || Utils::Shell.preferred
+        elsif args.shell
+          Utils::Shell.from_path(T.must(args.shell))
+        end
 
-    shell = if args.plain?
-      nil
-    elsif args.shell.nil?
-      :bash unless $stdout.tty?
-    elsif args.shell == "auto"
-      Utils::Shell.parent || Utils::Shell.preferred
-    elsif args.shell
-      Utils::Shell.from_path(args.shell)
-    end
-
-    if shell.nil?
-      BuildEnvironment.dump ENV.to_h
-    else
-      BuildEnvironment.keys(ENV.to_h).each do |key|
-        puts Utils::Shell.export_value(key, ENV.fetch(key), shell)
+        if shell.nil?
+          BuildEnvironment.dump ENV.to_h
+        else
+          BuildEnvironment.keys(ENV.to_h).each do |key|
+            puts Utils::Shell.export_value(key, ENV.fetch(key), shell)
+          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