Simplify `brew cask doctor`.

Library/Homebrew/cask/lib/hbc/cli/doctor.rb

@@ -2,23 +2,13 @@ module Hbc
   class CLI
     class Doctor < Base
       def self.run
-        ohai "macOS Release:", render_with_none_as_error(MacOS.full_version)
-        ohai "Hardware Architecture:", render_with_none_as_error("#{Hardware::CPU.type}-#{Hardware::CPU.bits}")
-        ohai "Ruby Version:", render_with_none_as_error("#{RUBY_VERSION}-p#{RUBY_PATCHLEVEL}")
-        ohai "Ruby Path:", render_with_none_as_error(RbConfig.ruby)
-        # TODO: consider removing most Homebrew constants from doctor output
-        ohai "Homebrew Version:", render_with_none_as_error(homebrew_version)
-        ohai "Homebrew Executable Path:", render_with_none_as_error(HOMEBREW_BREW_FILE)
-        ohai "Homebrew Cellar Path:", render_with_none_as_error(homebrew_cellar)
-        ohai "Homebrew Repository Path:", render_with_none_as_error(HOMEBREW_REPOSITORY)
-        ohai "Homebrew Origin:", render_with_none_as_error(homebrew_origin)
-        ohai "Homebrew-Cask Version:", render_with_none_as_error(Hbc.full_version)
+        ohai "Homebrew-Cask Version:", Hbc.full_version
         ohai "Homebrew-Cask Install Location:", render_install_location
         ohai "Homebrew-Cask Staging Location:", render_staging_location(Hbc.caskroom)
         ohai "Homebrew-Cask Cached Downloads:", render_cached_downloads
-        ohai "Homebrew-Cask Default Tap Path:", render_tap_paths(Hbc.default_tap.path)
-        ohai "Homebrew-Cask Alternate Cask Taps:", render_tap_paths(alt_taps)
-        ohai "Homebrew-Cask Default Tap Cask Count:", render_with_none_as_error(default_cask_count)
+        ohai "Homebrew-Cask Taps:"
+        puts render_taps(Hbc.default_tap)
+        puts render_taps(*alt_taps)
         ohai "Contents of $LOAD_PATH:", render_load_path($LOAD_PATH)
         ohai "Contents of $RUBYLIB Environment Variable:", render_env_var("RUBYLIB")
         ohai "Contents of $RUBYOPT Environment Variable:", render_env_var("RUBYOPT")
@@ -33,69 +23,6 @@ module Hbc
         ohai "Contents of Locale Environment Variables:", render_with_none(locale_variables)
       end
 
-      def self.alt_taps
-        Tap.select { |t| t.cask_dir && t != Hbc.default_tap }
-           .map(&:path)
-      end
-
-      def self.default_cask_count
-        Hbc.default_tap.cask_files.count
-      rescue StandardError
-        "0 #{error_string "Error reading #{Hbc.default_tap.path}"}"
-      end
-
-      def self.homebrew_origin
-        homebrew_origin = notfound_string
-        begin
-          Dir.chdir(HOMEBREW_REPOSITORY) do
-            homebrew_origin = SystemCommand.run("/usr/bin/git",
-                                                     args:         %w[config --get remote.origin.url],
-                                                     print_stderr: false).stdout.strip
-          end
-          if homebrew_origin !~ /\S/
-            homebrew_origin = "#{none_string} #{error_string}"
-          elsif homebrew_origin !~ %r{(mxcl|Homebrew)/(home)?brew(\.git)?\Z}
-            homebrew_origin.concat " #{error_string "warning: nonstandard origin"}"
-          end
-        rescue StandardError
-          homebrew_origin = error_string "Not Found - Error running git"
-        end
-        homebrew_origin
-      end
-
-      def self.homebrew_cellar
-        homebrew_constants("cellar")
-      end
-
-      def self.homebrew_version
-        homebrew_constants("version")
-      end
-
-      def self.homebrew_taps
-        Tap::TAP_DIRECTORY
-      end
-
-      def self.homebrew_constants(name)
-        @homebrew_constants ||= {}
-        return @homebrew_constants[name] if @homebrew_constants.key?(name)
-        @homebrew_constants[name] = notfound_string
-        begin
-          @homebrew_constants[name] = SystemCommand.run!(HOMEBREW_BREW_FILE,
-                                                         args:         ["--#{name}"],
-                                                         print_stderr: false)
-                                                   .stdout
-                                                   .strip
-          if @homebrew_constants[name] !~ /\S/
-            @homebrew_constants[name] = "#{none_string} #{error_string}"
-          end
-          path = Pathname.new(@homebrew_constants[name])
-          @homebrew_constants[name] = path if path.exist?
-        rescue StandardError
-          @homebrew_constants[name] = error_string "Not Found - Error running brew"
-        end
-        @homebrew_constants[name]
-      end
-
       def self.locale_variables
         ENV.keys.grep(/^(?:LC_\S+|LANG|LANGUAGE)\Z/).collect { |v| %Q(#{v}="#{ENV[v]}") }.sort.join("\n")
       end
@@ -108,10 +35,6 @@ module Hbc
         /phinze/
       end
 
-      def self.notfound_string
-        Formatter.error("Not Found - Unknown Error")
-      end
-
       def self.error_string(string = "Error")
         Formatter.error("(#{string})")
       end
@@ -121,20 +44,25 @@ module Hbc
         none_string
       end
 
-      def self.render_with_none_as_error(string)
-        return string if !string.nil? && string.respond_to?(:to_s) && !string.to_s.empty?
-        "#{none_string} #{error_string}"
+      def self.alt_taps
+        Tap.select { |t| t.cask_dir && t != Hbc.default_tap }
+      end
+
+      def self.cask_count_for_tap(tap)
+        count = tap.cask_files.count
+        "#{count} #{count == 1 ? "cask" : "casks"}"
+      rescue StandardError
+        "0 #{error_string "error reading #{tap.path}"}"
       end
 
-      def self.render_tap_paths(paths)
-        paths = [paths] unless paths.respond_to?(:each)
-        paths.collect do |dir|
-          if dir.nil? || dir.to_s.empty?
+      def self.render_taps(*taps)
+        taps.collect do |tap|
+          if tap.path.nil? || tap.path.to_s.empty?
             none_string
-          elsif dir.to_s.match(legacy_tap_pattern)
-            dir.to_s.concat(" #{error_string "Warning: legacy tap path"}")
+          elsif tap.path.to_s.match(legacy_tap_pattern)
+            tap.path.to_s.concat(" #{error_string "Warning: legacy tap path"}")
           else
-            dir.to_s
+            "#{tap.path} (#{cask_count_for_tap(tap)})"
           end
         end
       end
@@ -151,7 +79,7 @@ module Hbc
       # where "doctor" is needed is precisely the situation where such
       # things are less dependable.
       def self.render_install_location
-        locations = Dir.glob(Pathname.new(homebrew_cellar).join("brew-cask", "*")).reverse
+        locations = Dir.glob(HOMEBREW_CELLAR.join("brew-cask", "*")).reverse
         if locations.empty?
           none_string
         else