Remove bundler Ruby version resolution workarounds

With the recent Rubygems server fixes and database backfills, we don't
need most of the manual workarounds to resolve dependency Ruby version
support.

Author: pirj

Gemfile

@@ -14,63 +14,32 @@ group :documentation do
   gem 'relish', '~> 0.7.1'
 end
 
-platforms :jruby do
-  gem "jruby-openssl"
-end
+gem 'rake', '~> 12'
 
-case RAILS_VERSION
-when /main/
-  MAJOR = 6
-  MINOR = 0
-when /5-2-stable/
-  MAJOR = 5
-  MINOR = 2
-when /stable/
-  MAJOR = 6
-  MINOR = 0
-when nil, false, ""
-  MAJOR = 6
-  MINOR = 0
-else
-  match = /(\d+)(\.|-)(\d+)/.match(RAILS_VERSION)
-  MAJOR, MINOR = match.captures.map(&:to_i).compact
+if RUBY_VERSION.to_f >= 2.3
+  gem 'rubocop', '~> 0.80.1'
 end
 
+gem 'capybara'
+
+MAJOR =
+  case RAILS_VERSION
+  when /5-2-stable/
+    5
+  when /main/, /stable/, nil, false, ''
+    6
+  else
+    /(\d+)[\.|-]\d+/.match(RAILS_VERSION).captures.first.to_i
+  end
+
 if MAJOR >= 6
-  gem 'selenium-webdriver', '~> 3.5', require: false
+  # sqlite3 is an optional, unspecified, dependency and Rails 6.0 only supports `~> 1.4`
   gem 'sqlite3', '~> 1.4', platforms: [:ruby]
 else
+  # Similarly, Rails 5.0 only supports '~> 1.3.6'. Rails 5.1-5.2 support '~> 1.3', '>= 1.3.6'
   gem 'sqlite3', '~> 1.3.6', platforms: [:ruby]
 end
 
-gem 'ffi', '~> 1.9.25'
-
-gem 'rake', '~> 12'
-
-gem 'mime-types', "~> 3"
-
-if RUBY_VERSION.to_f < 2.3
-  gem 'capybara', '~> 3.1.0'
-elsif RUBY_VERSION.to_f < 2.4
-  gem 'capybara', '< 3.16'
-elsif RUBY_VERSION.to_f < 2.5
-  gem 'capybara', '< 3.33'
-else
-  gem 'capybara', '>= 2.13', '< 4.0', require: false
-end
-
-if MAJOR < 6
-  gem 'nokogiri', '1.9.1'
-else
-  gem 'nokogiri', '>= 1.10.8'
-end
-
-gem "rubyzip", '~> 1.2'
-
-if RUBY_VERSION.to_f >= 2.3
-  gem 'rubocop', '~> 0.80.1'
-end
-
 custom_gemfile = File.expand_path('Gemfile-custom', __dir__)
 eval_gemfile custom_gemfile if File.exist?(custom_gemfile)
 

Gemfile-rails-dependencies

@@ -14,11 +14,11 @@ when /main/
   gem 'sprockets-rails', :git => 'https://github.com/rails/sprockets-rails.git', :branch => 'master'
   gem 'puma', "3.12.1"
   gem 'activerecord-jdbcsqlite3-adapter', git: 'https://github.com/jruby/activerecord-jdbc-adapter', platforms: [:jruby]
+  gem 'selenium-webdriver', require: false
 when /stable$/
   gem_list = %w[rails railties actionmailer actionpack activerecord activesupport activejob actionview]
   gem 'puma', "3.12.1" if version > '5-0-stable'
   gem 'activerecord-jdbcsqlite3-adapter', git: 'https://github.com/jruby/activerecord-jdbc-adapter', platforms: [:jruby]
-  gem "sprockets", '~> 3.0' if RUBY_VERSION < '2.5'
 
   gem_list.each do |rails_gem|
     gem rails_gem, :git => "https://github.com/rails/rails.git", :branch => version
@@ -27,14 +27,13 @@ when nil, false, ""
   gem "rails", "~> 6.0.0"
   gem "puma"
   gem 'activerecord-jdbcsqlite3-adapter', platforms: [:jruby]
+  gem 'selenium-webdriver', require: false
 else
   gem "rails", version
   gem "sprockets", '~> 3.0' if RUBY_VERSION < '2.5'
   gem "puma" if version >= '5-1-stable'
-
-  if version.gsub(/[^\d\.]/,'').to_f >= 6.0
-    gem "activerecord-jdbcsqlite3-adapter", "~> 60.0.rc1", platforms: [:jruby]
-  else
-    gem 'activerecord-jdbcsqlite3-adapter', platforms: [:jruby]
-  end
+  gem 'activerecord-jdbcsqlite3-adapter', platforms: [:jruby]
+  gem 'selenium-webdriver', require: false if version >= '5'
 end
+
+gem 'jruby-openssl', platforms: [:jruby]

example_app_generator/generate_app.rb

@@ -21,54 +21,40 @@
   gsub_file 'Gemfile', /^.*\bgem 'rails.*$/, ''
   gsub_file "Gemfile", /.*web-console.*/, ''
   gsub_file "Gemfile", /.*debugger.*/, ''
-  gsub_file "Gemfile", /.*byebug.*/, "gem 'byebug', '~> 9.0.6'"
-  gsub_file "Gemfile", /.*puma.*/, ""
-  gsub_file "Gemfile", /.*gem..sqlite3.*/, "gem 'sqlite3', '~> 1.3.6'"
-  gsub_file "Gemfile", /.*bootsnap.*/, ""
+  gsub_file "Gemfile", /.*puma.*/, ''
+  gsub_file "Gemfile", /.*bootsnap.*/, ''
 
-  if Rails::VERSION::STRING >= '5.0.0'
-    append_to_file('Gemfile', "gem 'rails-controller-testing'\n")
+  # We soft-support Rails 4.2. `rails-controller-testing` only supports Rails 5+.
+  # This conditional is to facilitate local testing against Rails 4.2.
+  if Rails::VERSION::STRING >= '5'
+    append_to_file 'Gemfile', "gem 'rails-controller-testing'\n"
   end
 
   if Rails::VERSION::STRING >= '6'
-    gsub_file "Gemfile", /.*gem..sqlite3.*/, "gem 'sqlite3', '~> 1.4'"
     gsub_file "Gemfile", /.*rails-controller-testing.*/, "gem 'rails-controller-testing', git: 'https://github.com/rails/rails-controller-testing'"
   end
 
-  if RUBY_VERSION < "2.3.0"
-    gsub_file "Gemfile", /.*childprocess.*/, "gem 'childprocess', '< 2.0.0'"
-    gsub_file "Gemfile", /.*i18n.*/, "gem 'i18n', '< 1.5.2'"
-    gsub_file "Gemfile", /.*nio4r.*/, "gem 'nio4r', '< 2.4.0'"
-    gsub_file "Gemfile", /.*public_suffix.*/, "gem 'public_suffix', '< 4.0.0'"
-    gsub_file "Gemfile", /.*rack.*/, "gem 'rack', '< 2.2.0', '!= 2.1.0'"
-    gsub_file "Gemfile", /.*xpath.*/, "gem 'xpath', '< 3.2.0'"
+  if Rails::VERSION::STRING >= '6'
+    # sqlite3 is an optional, unspecified, dependency and Rails 6.0 only supports `~> 1.4`
+    gsub_file "Gemfile", /.*gem..sqlite3.*/, "gem 'sqlite3', '~> 1.4'"
+  else
+    # Similarly, Rails 5.0 only supports '~> 1.3.6'. Rails 5.1-5.2 support '~> 1.3', '>= 1.3.6'
+    gsub_file "Gemfile", /.*gem..sqlite3.*/, "gem 'sqlite3', '~> 1.3.6'"
   end
 
   if Rails::VERSION::STRING >= "5.1.0"
-    if RUBY_VERSION < "2.3"
-      gsub_file "Gemfile", /.*capybara.*/, "gem 'capybara', '~> 3.1.0'"
-    elsif RUBY_VERSION < "2.4"
-      gsub_file "Gemfile", /.*capybara.*/, "gem 'capybara', '~> 3.15.0'"
-    elsif RUBY_VERSION < "2.5"
-      gsub_file "Gemfile", /.*capybara.*/, "gem 'capybara', '~> 3.32.0'"
-    end
-    if Rails::VERSION::STRING >= "5.2.0"
-      gsub_file "Gemfile", /.*chromedriver-helper.*/, "gem 'webdrivers', '< 4.0.0'"
-    else
-      gsub_file "Gemfile", /.*chromedriver-helper.*/, "gem 'webdrivers'"
-    end
+    # webdrivers 4 up until 4.3.0 don't specify `required_ruby_version`, but contain
+    # Ruby 2.2-incompatible syntax (safe navigation).
+    # That basically means we use pre-4.0 for Ruby 2.2, and 4.3+ for newer Rubies.
+    gsub_file "Gemfile", /.*chromedriver-helper.*/, "gem 'webdrivers', '!= 4.0.0', '!= 4.0.1', '!= 4.1.0', '!= 4.1.1', '!= 4.1.2', '!= 4.1.3', '!= 4.2.0'"
   end
 
   if Rails::VERSION::STRING >= '5.2.0' && Rails::VERSION::STRING < '6'
     copy_file sqlite_initializer, 'config/initializers/sqlite3_fix.rb'
   end
 
-  # Nokogiri version is pinned in rspec-rails' Gemfile since it tend to cause installation problems
-  # on Travis CI, so we pin nokogiri in this example app also.
-  if RUBY_ENGINE != "jruby"
-    append_to_file 'Gemfile', "gem 'nokogiri', '#{Nokogiri::VERSION}'\n"
-  else
-    gsub_file "Gemfile", /.*jdbc.*/, ""
+  if RUBY_ENGINE == "jruby"
+    gsub_file "Gemfile", /.*jdbc.*/, ''
   end
 
   # Use our version of RSpec and Rails