Port Homebrew::Cmd::Desc

Library/Homebrew/cmd/desc.rb

@@ -1,17 +1,15 @@
-# typed: true
+# typed: strict
 # frozen_string_literal: true
 
+require "abstract_command"
 require "descriptions"
 require "search"
 require "description_cache_store"
-require "cli/parser"
 
 module Homebrew
-  module_function
-
-  sig { returns(CLI::Parser) }
-  def desc_args
-    Homebrew::CLI::Parser.new do
+  module Cmd
+    class Desc < AbstractCommand
+      cmd_args do
         description <<~EOS
           Display <formula>'s name and one-line description.
           The cache is created on the first search, making that search slower than subsequent ones.
@@ -37,11 +35,9 @@ module Homebrew
 
         named_args [:formula, :cask, :text_or_regex], min: 1
       end
-  end
-
-  def desc
-    args = desc_args.parse
 
+      sig { override.void }
+      def run
         if !args.eval_all? && !Homebrew::EnvConfig.eval_all?
           raise UsageError, "`brew desc` needs `--eval-all` passed or `HOMEBREW_EVAL_ALL` set!"
         end
@@ -57,11 +53,14 @@ module Homebrew
         if search_type.blank?
           desc = {}
           args.named.to_formulae_and_casks.each do |formula_or_cask|
-        if formula_or_cask.is_a? Formula
+            case formula_or_cask
+            when Formula
               desc[formula_or_cask.full_name] = formula_or_cask.desc
-        else
+            when Cask::Cask
               description = formula_or_cask.desc.presence || Formatter.warning("[no description]")
               desc[formula_or_cask.full_name] = "(#{formula_or_cask.name.join(", ")}) #{description}"
+            else
+              raise TypeError, "Unsupported formula_or_cask type: #{formula_or_cask.class}"
             end
           end
           Descriptions.new(desc).print
@@ -72,3 +71,5 @@ module Homebrew
         end
       end
     end
+  end
+end

Library/Homebrew/test/cmd/desc_spec.rb

@@ -1,8 +1,9 @@
 # frozen_string_literal: true
 
+require "cmd/desc"
 require "cmd/shared_examples/args_parse"
 
-RSpec.describe "brew desc" do
+RSpec.describe Homebrew::Cmd::Desc do
   it_behaves_like "parseable arguments"
 
   it "shows a given Formula's description", :integration_test do