Update to modern FbF standards

.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 2
+charset=utf-8

.github/workflows/tests.yml

@@ -1,20 +1,19 @@
 name: tests
+
 on:
 - push
+
 jobs:
   build:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        ruby: ['2.x']
     steps:
-    - name: check out source
-      uses: actions/checkout@v2
-    - name: set up ruby
-      uses: actions/setup-ruby@v1
+    - name: Checkout source
+      uses: actions/checkout@v4
+    - name: Setup Ruby
+      uses: ruby/setup-ruby@v1
       with:
-        ruby-version: ${{ matrix.ruby }}
-    - name: build and test
+        bundler-cache: true
+    - name: Build and test
       run: |
         gem install bundler
         bundle install --jobs 4 --retry 3
@@ -23,7 +22,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/')
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: |
           mkdir ~/.gem
           echo ":github: Bearer ${{ secrets.GITHUB_TOKEN }}" >> ~/.gem/credentials

.rubocop.yml

@@ -0,0 +1,166 @@
+AllCops:
+  NewCops: enable
+  TargetRubyVersion: 3.3.0
+
+Bundler/OrderedGems:
+  Enabled: false
+
+Layout/ArgumentAlignment:
+  Enabled: false
+  EnforcedStyle: with_fixed_indentation
+
+Layout/BlockEndNewline:
+  Enabled: false
+
+Layout/DefEndAlignment:
+  EnforcedStyleAlignWith: 'start_of_line'
+
+Layout/ElseAlignment:
+  Enabled: false
+
+Layout/EndAlignment:
+  EnforcedStyleAlignWith: 'start_of_line'
+
+Layout/FirstArgumentIndentation:
+  EnforcedStyle: 'consistent'
+
+Layout/FirstArrayElementIndentation:
+  EnforcedStyle: 'consistent'
+
+Layout/FirstHashElementIndentation:
+  EnforcedStyle: 'consistent'
+
+Layout/HashAlignment:
+  Exclude:
+    - 'lib/tasks/auto_annotate_models.rake'
+
+Layout/IndentationWidth:
+  Enabled: false
+
+Layout/LineLength:
+  Enabled: false
+
+Layout/MultilineBlockLayout:
+  Enabled: false
+
+Layout/MultilineMethodCallBraceLayout:
+  Enabled: false
+
+Layout/MultilineMethodCallIndentation:
+  Enabled: false
+
+Layout/ParameterAlignment:
+  EnforcedStyle: 'with_first_parameter'
+
+Layout/RescueEnsureAlignment:
+  Enabled: false
+
+Lint/AmbiguousBlockAssociation:
+  Enabled: false
+
+Lint/ShadowingOuterLocalVariable:
+  Enabled: false
+
+Lint/SuppressedException:
+  Exclude:
+    - 'db/**/*'
+
+Lint/UnusedMethodArgument:
+  AllowUnusedKeywordArguments: true
+
+Metrics/AbcSize:
+  Max: 66
+  Exclude:
+    - '**/db/**/*'
+
+Metrics/BlockLength:
+  Enabled: false
+
+Metrics/ClassLength:
+  Enabled: false
+
+Metrics/CyclomaticComplexity:
+  Max: 15
+
+Metrics/MethodLength:
+  Enabled: false
+
+Metrics/ModuleLength:
+  Enabled: false
+
+Metrics/ParameterLists:
+  Max: 6
+
+Metrics/PerceivedComplexity:
+  Max: 15
+
+Naming/VariableNumber:
+  CheckSymbols: false
+
+Naming/BlockForwarding:
+  Enabled: false
+
+Style/Alias:
+  EnforcedStyle: 'prefer_alias_method'
+
+Style/NumericLiterals:
+  AllowedPatterns:
+    - \d{4}_\d{2}_\d{2}_\d{6}
+
+Style/Documentation:
+  Enabled: false
+
+Style/EmptyMethod:
+  Enabled: false
+
+Style/FrozenStringLiteralComment:
+  Enabled: false
+
+Style/HashAsLastArrayItem:
+  EnforcedStyle: no_braces
+
+Style/IfInsideElse:
+  Enabled: false
+
+Style/IfUnlessModifier:
+  Enabled: false
+
+Style/Lambda:
+  EnforcedStyle: 'literal'
+
+Style/MixinUsage:
+  Exclude:
+    - 'bin/*'
+
+Style/MultilineBlockChain:
+  Enabled: false
+
+Style/MutableConstant:
+  Enabled: false
+
+Style/OpenStructUse:
+  Enabled: false
+
+Style/PercentLiteralDelimiters:
+  Enabled: false
+
+Style/PerlBackrefs:
+  Enabled: false
+
+Style/RegexpLiteral:
+  AllowInnerSlashes: true
+
+Style/RescueModifier:
+  Enabled: false
+
+Style/RescueStandardError:
+  Enabled: false
+
+Style/SymbolArray:
+  EnforcedStyle: 'brackets'
+
+Style/WordArray:
+  Enabled: false
+
+Style/HashSyntax:
+  Enabled: false

.ruby-version

@@ -0,0 +1 @@
+3.3.0

Gemfile

@@ -1,4 +1,3 @@
 source 'https://rubygems.org'
 
-# Specify your gem's dependencies in rich-text.gemspec
 gemspec

Rakefile

@@ -1,13 +1,13 @@
-require "bundler/gem_tasks"
-require "rake/testtask"
-require "yard"
+require 'bundler/gem_tasks'
+require 'rake/testtask'
+require 'yard'
 
 Rake::TestTask.new(:test) do |t|
-  t.libs << "test"
-  t.libs << "lib"
+  t.libs << 'test'
+  t.libs << 'lib'
   t.test_files = FileList['test/**/*_test.rb']
 end
 
 YARD::Rake::YardocTask.new(:doc)
 
-task :default => :test
+task default: :test

bin/bundle

@@ -0,0 +1,109 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'bundle' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require "rubygems"
+
+m = Module.new do
+  module_function
+
+  def invoked_as_script?
+    File.expand_path($0) == File.expand_path(__FILE__)
+  end
+
+  def env_var_version
+    ENV["BUNDLER_VERSION"]
+  end
+
+  def cli_arg_version
+    return unless invoked_as_script? # don't want to hijack other binstubs
+    return unless "update".start_with?(ARGV.first || " ") # must be running `bundle update`
+    bundler_version = nil
+    update_index = nil
+    ARGV.each_with_index do |a, i|
+      if update_index && update_index.succ == i && a.match?(Gem::Version::ANCHORED_VERSION_PATTERN)
+        bundler_version = a
+      end
+      next unless a =~ /\A--bundler(?:[= ](#{Gem::Version::VERSION_PATTERN}))?\z/
+      bundler_version = $1
+      update_index = i
+    end
+    bundler_version
+  end
+
+  def gemfile
+    gemfile = ENV["BUNDLE_GEMFILE"]
+    return gemfile if gemfile && !gemfile.empty?
+
+    File.expand_path("../Gemfile", __dir__)
+  end
+
+  def lockfile
+    lockfile =
+      case File.basename(gemfile)
+      when "gems.rb" then gemfile.sub(/\.rb$/, ".locked")
+      else "#{gemfile}.lock"
+      end
+    File.expand_path(lockfile)
+  end
+
+  def lockfile_version
+    return unless File.file?(lockfile)
+    lockfile_contents = File.read(lockfile)
+    return unless lockfile_contents =~ /\n\nBUNDLED WITH\n\s{2,}(#{Gem::Version::VERSION_PATTERN})\n/
+    Regexp.last_match(1)
+  end
+
+  def bundler_requirement
+    @bundler_requirement ||=
+      env_var_version ||
+      cli_arg_version ||
+      bundler_requirement_for(lockfile_version)
+  end
+
+  def bundler_requirement_for(version)
+    return "#{Gem::Requirement.default}.a" unless version
+
+    bundler_gem_version = Gem::Version.new(version)
+
+    bundler_gem_version.approximate_recommendation
+  end
+
+  def load_bundler!
+    ENV["BUNDLE_GEMFILE"] ||= gemfile
+
+    activate_bundler
+  end
+
+  def activate_bundler
+    gem_error = activation_error_handling do
+      gem "bundler", bundler_requirement
+    end
+    return if gem_error.nil?
+    require_error = activation_error_handling do
+      require "bundler/version"
+    end
+    return if require_error.nil? && Gem::Requirement.new(bundler_requirement).satisfied_by?(Gem::Version.new(Bundler::VERSION))
+    warn "Activating bundler (#{bundler_requirement}) failed:\n#{gem_error.message}\n\nTo install the version of bundler this project requires, run `gem install bundler -v '#{bundler_requirement}'`"
+    exit 42
+  end
+
+  def activation_error_handling
+    yield
+    nil
+  rescue StandardError, LoadError => e
+    e
+  end
+end
+
+m.load_bundler!
+
+if m.invoked_as_script?
+  load Gem.bin_path("bundler", "bundle")
+end

bin/htmldiff

@@ -0,0 +1,27 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'htmldiff' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../Gemfile", __dir__)
+
+bundle_binstub = File.expand_path("bundle", __dir__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 300).include?("This file was generated by Bundler")
+    load(bundle_binstub)
+  else
+    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
+Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
+  end
+end
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("diff-lcs", "htmldiff")