Use bundle install when running via gemfile

.github/workflows/rubocop.yml

@@ -10,7 +10,7 @@ jobs:
   rubocop:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
       - uses: ./
         with:

lib/github.rb

@@ -4,6 +4,9 @@
 module Github
   HttpError = Class.new(StandardError)
 
+  # The File class wraps the Github API response for files in a pull requests. Its main purpose
+  # is to provide the #changed_lines method which returns the line numbers of the lines which
+  # have changed in a file by parsing its patch attribute.
   class File
     RANGE_INFORMATION_LINE = /^@@ .+\+(?<line_number>\d+),/.freeze
     MODIFIED_LINE = /^\+(?!\+|\+)/.freeze
@@ -42,23 +45,22 @@ def changed_lines
     delete: Net::HTTP::Delete,
   }.freeze
 
+  # Defines .get, .patch, .post, and .delete methods for making requests to the GitHub API.
+  # For successful requests, The JSON parsed body is returned, otherwise HttpError is raised.
   REQUEST_METHOD_TO_CLASS.each do |method, klass|
     define_singleton_method(method) do |path, params = nil|
-      request(klass, path, params)
-    end
-
-    define_singleton_method("#{method}!") do |path, params = nil|
       response = request(klass, path, params)
       raise HttpError, "status: #{response.code}, body: #{response.body}" unless response.is_a?(Net::HTTPSuccess)
 
       JSON.parse(response.body) if response.body
     end
   end
 
+  # Returns Array of File objects for all files in a pull request which have the .rb extension.
   def self.pull_request_ruby_files(owner_and_repository, pr_number)
     changed_files = []
     1.step do |page|
-      files = Github.get!("/repos/#{owner_and_repository}/pulls/#{pr_number}/files?per_page=100&page=#{page}")
+      files = Github.get("/repos/#{owner_and_repository}/pulls/#{pr_number}/files?per_page=100&page=#{page}")
       changed_files.concat(files)
       break if files.length < 100
     end

rubocop.rb

@@ -6,21 +6,35 @@
 # Setup
 
 puts "::group::Installing Rubocop gems"
-versioned_rubocop_gems =
-  if ENV.fetch("RUBOCOP_GEM_VERSIONS").downcase == "gemfile"
-    require "bundler"
 
-    rubocop_config_gems_without_prefix = %w[syntax_tree].to_set
+if ENV.fetch("RUBOCOP_GEM_VERSIONS").downcase == "gemfile"
+  require "bundler"
 
-    Bundler::LockfileParser.new(Bundler.read_file("Gemfile.lock")).specs
-      .select { |spec| spec.name.start_with?("rubocop") || rubocop_config_gems_without_prefix.include?(spec.name) }
-      .map { |spec| "#{spec.name}:#{spec.version}" }
-  else
-    ENV.fetch("RUBOCOP_GEM_VERSIONS").split
+  gemfile = Bundler::LockfileParser.new(Bundler.read_file("Gemfile.lock"))
+  to_remove = gemfile.dependencies.keys.reject do |dependency|
+    dependency.include?("rubocop") || dependency == "syntax_tree"
   end
-gem_install_command = "gem install #{versioned_rubocop_gems.join(' ')} --no-document --conservative"
-puts "Installing gems with:", gem_install_command
-system "time #{gem_install_command}"
+
+  puts "Removing non rubocop gems from Gemfile"
+  system("bundle remove #{to_remove.join(' ')}") or abort("ERROR: Failed to remove non rubocop gems from Gemfile")
+  puts
+
+  puts "Resulting Gemfile:"
+  puts Bundler.read_file("Gemfile")
+
+  puts "Installing gems with: bundle install"
+  system("time bundle install") or abort("ERROR: Failed to install gems")
+
+  rubocop_command = "bundle exec rubocop"
+else
+  versioned_rubocop_gems = ENV.fetch("RUBOCOP_GEM_VERSIONS").split
+  gem_install_command = "gem install #{versioned_rubocop_gems.join(' ')} --no-document --conservative"
+  puts "Installing gems with:", gem_install_command
+  system "time #{gem_install_command}"
+
+  rubocop_command = "rubocop"
+end
+
 puts "::endgroup::"
 
 # Script
@@ -38,7 +52,7 @@
 # JSON reference: https://docs.rubocop.org/rubocop/formatters.html#json-formatter
 files_with_offenses =
   if changed_ruby_files.any?
-    command = "rubocop #{changed_ruby_files.map(&:path).join(' ')} --format json --force-exclusion #{ARGV.join(' ')}"
+    command = "#{rubocop_command} #{changed_ruby_files.map(&:path).join(' ')} --format json --force-exclusion #{ARGV.join(' ')}"
 
     puts "Running rubocop with: #{command}"
     JSON.parse(`#{command}`).fetch("files")
@@ -52,7 +66,7 @@
 
 puts "Fetching PR comments from https://api.github.com/repos/#{owner_and_repository}/pulls/#{pr_number}/comments"
 
-existing_comments = Github.get!("/repos/#{owner_and_repository}/pulls/#{pr_number}/comments")
+existing_comments = Github.get("/repos/#{owner_and_repository}/pulls/#{pr_number}/comments")
 
 comments_made_by_rubocop = existing_comments.select do |comment|
   comment.fetch("body").include?("rubocop-comment-id")
@@ -76,7 +90,7 @@
 
   puts "Deleting resolved comment #{comment_id} on #{path} line #{line}"
 
-  Github.delete!("/repos/#{owner_and_repository}/pulls/comments/#{comment_id}")
+  Github.delete("/repos/#{owner_and_repository}/pulls/comments/#{comment_id}")
 end
 
 # Comment on the pull request with the offenses found
@@ -132,7 +146,7 @@ def in_diff?(changed_files, path, line)
       # Somehow the commit_id should not be just the HEAD SHA: https://stackoverflow.com/a/71431370/1075108
       commit_id = github_event.fetch("pull_request").fetch("head").fetch("sha")
 
-      Github.post!(
+      Github.post(
         "/repos/#{owner_and_repository}/pulls/#{pr_number}/comments",
         body: body,
         path: path,
@@ -147,7 +161,7 @@ def in_diff?(changed_files, path, line)
 
 # If there are any offenses outside the diff, make a separate comment for them
 
-separate_comments = Github.get!("/repos/#{owner_and_repository}/issues/#{pr_number}/comments")
+separate_comments = Github.get("/repos/#{owner_and_repository}/issues/#{pr_number}/comments")
 existing_separate_comment = separate_comments.find do |comment|
   comment.fetch("body").include?("rubocop-comment-id: outside-diff")
 end
@@ -173,12 +187,12 @@ def in_diff?(changed_files, path, line)
       puts "Skipping unchanged separate comment #{existing_comment_id}"
     else
       puts "Updating separate comment #{existing_comment_id}"
-      Github.patch!("/repos/#{owner_and_repository}/issues/comments/#{existing_comment_id}", body: body)
+      Github.patch("/repos/#{owner_and_repository}/issues/comments/#{existing_comment_id}", body: body)
     end
   else
     puts "Commenting on pull request with offenses found outside the diff"
 
-    Github.post!("/repos/#{owner_and_repository}/issues/#{pr_number}/comments", body: body)
+    Github.post("/repos/#{owner_and_repository}/issues/#{pr_number}/comments", body: body)
   end
 elsif existing_separate_comment
   existing_comment_id = existing_separate_comment.fetch("id")