Port Homebrew::DevCmd::Cat

Library/Homebrew/dev-cmd/cat.rb

@@ -1,12 +1,15 @@
-# typed: true
+# typed: strict
 # frozen_string_literal: true
 
+require "abstract_command"
 require "cli/parser"
 
 module Homebrew
-  sig { returns(CLI::Parser) }
+  module DevCmd
-  def self.cat_args
+    class Cat < AbstractCommand
-    Homebrew::CLI::Parser.new do
+      include FileUtils
+
+      cmd_args do
         description <<~EOS
           Display the source of a <formula> or <cask>.
         EOS
@@ -20,11 +23,9 @@ module Homebrew
 
         named_args [:formula, :cask], min: 1, without_api: true
       end
-  end
-
-  def self.cat
-    args = cat_args.parse
 
+      sig { override.void }
+      def run
         cd HOMEBREW_REPOSITORY do
           pager = if Homebrew::EnvConfig.bat?
             ENV["BAT_CONFIG_PATH"] = Homebrew::EnvConfig.bat_config_path
@@ -60,3 +61,5 @@ module Homebrew
         end
       end
     end
+  end
+end

Library/Homebrew/test/dev-cmd/cat_spec.rb

@@ -1,9 +1,10 @@
 # frozen_string_literal: true
 
 require "cmd/shared_examples/args_parse"
+require "dev-cmd/cat"
 
-RSpec.describe "brew cat" do
+RSpec.describe Homebrew::DevCmd::Cat do
-  it_behaves_like "parseable arguments"
+  it_behaves_like "parseable arguments", argv: ["foo"]
 
   it "prints the content of a given Formula", :integration_test do
     formula_file = setup_test_formula "testball"