Output annotations for brew cask audit.

Library/Homebrew/cask/cmd/audit.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "utils/github/actions"
+
 module Cask
   class Cmd
     # Implementation of the `brew cask audit` command.
@@ -57,7 +59,19 @@ module Cask
           odebug "Auditing Cask #{cask}"
           result = Auditor.audit(cask, **options)
 
-          result[:warnings].empty? && result[:errors].empty?
+          next true if result[:warnings].empty? && result[:errors].empty?
+
+          if ENV["GITHUB_ACTIONS"]
+            cask_path = cask.sourcefile_path
+            annotations = (result[:warnings].map { |w| [:warning, w] } + result[:errors].map { |e| [:error, e] })
+                          .map { |type, message| GitHub::Actions::Annotation.new(type, message, file: cask_path) }
+
+            annotations.each do |annotation|
+              puts annotation if annotation.relevant?
+            end
+          end
+
+          false
         end
 
         return if failed_casks.empty?

Library/Homebrew/style.rb

@@ -15,8 +15,15 @@ module Homebrew
       success = check_style_impl(files, :print, **options)
 
       if ENV["GITHUB_ACTIONS"] && !success
-        offenses = check_style_json(files, **options)
-        puts offenses.to_github_annotations
+        check_style_json(files, **options).each do |path, offenses|
+          offenses.each do |o|
+            line = o.location.line
+            column = o.location.line
+
+            annotation = GitHub::Actions::Annotation.new(:error, o.message, file: path, line: line, column: column)
+            puts annotation if annotation.relevant?
+          end
+        end
       end
 
       success
@@ -236,26 +243,6 @@ module Homebrew
       def each(*args, &block)
         @offenses.each(*args, &block)
       end
-
-      def to_github_annotations
-        workspace = ENV["GITHUB_WORKSPACE"]
-        return [] if workspace.blank?
-
-        workspace = Pathname(workspace).realpath
-
-        @offenses.flat_map do |path, offenses|
-          relative_path = path.relative_path_from(workspace)
-
-          # Only generate annotations for paths relative to the `GITHUB_WORKSPACE` directory.
-          next [] if relative_path.descend.next.to_s == ".."
-
-          offenses.map do |o|
-            line = o.location.line
-            column = o.location.line
-            GitHub::Actions::Annotation.new(:error, o.message, file: relative_path, line: line, column: column)
-          end
-        end
-      end
     end
 
     # A style offense.

Library/Homebrew/utils/github/actions.rb

@@ -14,12 +14,20 @@ module GitHub
 
     # Helper class for formatting annotations on GitHub Actions.
     class Annotation
+      def self.path_relative_to_workspace(path)
+        workspace = Pathname(ENV.fetch("GITHUB_WORKSPACE", Dir.pwd)).realpath
+        path = Pathname(path)
+        return path unless path.exist?
+
+        path.realpath.relative_path_from(workspace)
+      end
+
       def initialize(type, message, file: nil, line: nil, column: nil)
         raise ArgumentError, "Unsupported type: #{type.inspect}" unless [:warning, :error].include?(type)
 
         @type = type
         @message = String(message)
-        @file = Pathname(file) if file
+        @file = self.class.path_relative_to_workspace(file) if file
         @line = Integer(line) if line
         @column = Integer(column) if column
       end
@@ -33,6 +41,14 @@ module GitHub
 
         "::#{@type}#{metadata}::#{Actions.escape(@message)}"
       end
+
+      # An annotation is only relevant if the corresponding `file` is relative to
+      # the `GITHUB_WORKSPACE` directory or if no `file` is specified.
+      def relevant?
+        return true if @file.nil?
+
+        @file.descend.next.to_s != ".."
+      end
     end
   end
 end