Remove support for EOL Rubies (< 2.6)

In this PR:
  * Temporarily remove all YARD doc config, to be added back
    after migrating CI to Github Actions, to simplify config
    and dependencies
  * Remove all testing and references to < 2.6 Rubies
  * Simplify JRuby and TruffleRuby testing to latest stable versions

NOT in this PR:
  * Any simplifying code changes that are now possible due to
    removing support for EOL Rubies

Closes #58

.travis.yml

@@ -7,25 +7,16 @@ branches:
 rvm:
   # MRI
   - ruby-head
+  - 3.0
   - 2.7
   - 2.6
-  - 2.5
-  - 2.4
-  - 2.3
-  - 2.2
-  - 2.1
-  - 1.9.3
-  # JRuby
-  - jruby-head
-  - jruby-9.2
-  # Truffleruby
-  - truffleruby-head
-  - truffleruby-20.3.0
+  - jruby
+  - truffleruby
 
 jobs:
   allow_failures:
     - rvm: ruby-head
-    - rvm: jruby-head
-    - rvm: truffleruby-head
+    - rvm: jruby
+    - rvm: truffleruby
 
   fast_finish: true

Gemfile

@@ -1,11 +1,8 @@
-require File.expand_path("on_what", File.dirname(__FILE__))
 source "https://rubygems.org"
 
 # Travis-only dependencies go here
-if on_travis? && !on_less_than_2_3?
-  group :test do
-    gem "codecov", ">= 0.0.9", :require => false
-  end
+if ENV["CI"] == "true"
+  gem "codecov", require: false, group: "test"
 end
 
 # Specify gem's dependencies in docile.gemspec

HISTORY.md

@@ -7,6 +7,9 @@
       constructing a proxy object) when the DSL object and block context object are
       identical (*Sorry it took over a year to review and merge this!*)
   - Renamed default branch from master to main, see: https://github.com/github/renaming
+  - Temporarily removed YARD doc configuration, to replace after
+    migration to Github Actions
+  - Removed support for all EOL Rubies < 2.6  
 
 ## [v1.3.5 (Jan 13, 2021)](http://github.com/ms-ati/docile/compare/v1.3.4...v1.3.5)
 

README.md

@@ -1,8 +1,3 @@
-## ⚠️WARNING⚠️, 🔴IMPORTANT❗🔴
-### Using Docile on an [end-of-life Ruby version (< **2.5**)](https://www.ruby-lang.org/en/downloads/branches/)?
-#### Please comment on [issue #58](https://github.com/ms-ati/docile/issues/58) this month 📅!
-We'll decide which Ruby versions to continue supporting on **Feb 1st 2021**.
-
 # Docile
 
 [![Gem Version](https://img.shields.io/gem/v/docile.svg)](https://rubygems.org/gems/docile)
@@ -29,7 +24,7 @@ coding a bit more docile...
 
 ## Usage
 
-### Basic: Ruby [Array](http://ruby-doc.org/core-2.2.2/Array.html) as DSL
+### Basic: Ruby [Array](http://ruby-doc.org/core-3.0.0/Array.html) as DSL
 
 Let's say that we want to make a DSL for modifying Array objects.
 Wouldn't it be great if we could just treat the methods of Array as a DSL?
@@ -274,11 +269,11 @@ Sometimes, you want to use an object as a DSL, but it doesn't quite fit the
 above.
 
 Instead of methods like
-[Array#push](http://www.ruby-doc.org/core-2.0/Array.html#method-i-push), which
+[Array#push](http://www.ruby-doc.org/core-3.0.0/Array.html#method-i-push), which
 modifies the object at hand, it has methods like
-[String#reverse](http://www.ruby-doc.org/core-2.0/String.html#method-i-reverse),
+[String#reverse](http://www.ruby-doc.org/core-3.0.0/String.html#method-i-reverse),
 which returns a new object without touching the original. Perhaps it's even
-[frozen](http://www.ruby-doc.org/core-2.0/Object.html#method-i-freeze) in
+[frozen](http://www.ruby-doc.org/core-3.0.0/Object.html#method-i-freeze) in
 order to enforce [immutability](http://en.wikipedia.org/wiki/Immutable_object).
 
 Wouldn't it be great if we could just treat these methods as a DSL as well?
@@ -356,7 +351,7 @@ $ gem install docile
 
 ## Status
 
-Works on [all ruby versions since 1.9.3](https://github.com/ms-ati/docile/blob/master/.travis.yml), or so Travis CI [tells us](https://travis-ci.org/ms-ati/docile).
+Works on [all currently supported ruby versions](https://github.com/ms-ati/docile/blob/master/.travis.yml), or so Travis CI [tells us](https://travis-ci.org/ms-ati/docile).
 
 Used by some pretty cool gems to implement their DSLs, notably including [SimpleCov](https://github.com/colszowka/simplecov). Keep an eye out for new gems using Docile at the [Ruby Toolbox](https://www.ruby-toolbox.com/projects/docile).
 
@@ -382,5 +377,3 @@ Docile releases follow [Semantic Versioning 2.0.0](https://semver.org/spec/v2.0.
 Copyright (c) 2012-2021 Marc Siegel.
 
 Licensed under the [MIT License](http://choosealicense.com/licenses/mit/), see [LICENSE](LICENSE) for details.
-
-

Rakefile

@@ -1,7 +1,6 @@
 require "rake/clean"
 require "bundler/gem_tasks"
 require "rspec/core/rake_task"
-require File.expand_path("on_what", File.dirname(__FILE__))
 
 # Default task for `rake` is to run rspec
 task :default => [:spec]
@@ -11,18 +10,3 @@ RSpec::Core::RakeTask.new
 
 # Configure `rake clobber` to delete all generated files
 CLOBBER.include("pkg", "doc", "coverage")
-
-# To limit needed compatibility with versions of dependencies, only configure
-#   yard doc generation when *not* on Travis, JRuby, or < 2.0
-if !on_travis? && !on_jruby? && !on_less_than_2_0?
-  require "github/markup"
-  require "redcarpet"
-  require "yard"
-  require "yard/rake/yardoc_task"
-
-  YARD::Rake::YardocTask.new do |t|
-    OTHER_PATHS = %w()
-    t.files   = ["lib/**/*.rb", OTHER_PATHS]
-    t.options = %w(--markup-provider=redcarpet --markup=markdown --main=README.md)
-  end
-end

docile.gemspec

@@ -1,5 +1,4 @@
 $:.push File.expand_path("../lib", __FILE__)
-require File.expand_path("on_what", File.dirname(__FILE__))
 require "docile/version"
 
 Gem::Specification.new do |s|
@@ -25,20 +24,8 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
 
   # Specify oldest supported Ruby version
-  s.required_ruby_version = ">= 1.9.3"
+  s.required_ruby_version = ">= 2.6.0"
 
-  # Run rspec tests from rake even on old Ruby versions
-  s.add_development_dependency "rake", "< 11.0" # See http://stackoverflow.com/questions/35893584/nomethoderror-undefined-method-last-comment-after-upgrading-to-rake-11
-  s.add_development_dependency "rspec", "~> 3.0"
-  s.add_development_dependency "rspec-expectations", "!= 3.8.3" # Workaround for RSpec's issue, see: https://github.com/rspec/rspec-expectations/issues/1111
-
-  # To limit needed compatibility with versions of dependencies, only configure
-  #   yard doc generation when *not* on Travis, JRuby, or < 2.3
-  if !on_travis? && !on_jruby? && !on_less_than_2_3?
-    # Github flavored markdown in YARD documentation
-    # http://blog.nikosd.com/2011/11/github-flavored-markdown-in-yard.html
-    s.add_development_dependency "yard"
-    s.add_development_dependency "redcarpet"
-    s.add_development_dependency "github-markup"
-  end
+  s.add_development_dependency "rake", "~> 12.3.3"
+  s.add_development_dependency "rspec", "~> 3.9"
 end

lib/docile.rb

@@ -124,7 +124,7 @@ module Docile
   def dsl_eval_immutable(dsl, *args, &block)
     exec_in_proxy_context(dsl, ChainingFallbackContextProxy, *args, &block)
   end
-  
+
   ruby2_keywords :dsl_eval_immutable if respond_to?(:ruby2_keywords, true)
   module_function :dsl_eval_immutable
 end

on_what.rb

@@ -1,18 +0,0 @@
-# NOTE: Very simple tests for what system we are on, extracted for sharing
-#   between Rakefile, gemspec, and spec_helper. Not for use in actual library.
-
-def on_travis?
-  ENV["CI"] == "true"
-end
-
-def on_jruby?
-  defined?(RUBY_ENGINE) && "jruby" == RUBY_ENGINE
-end
-
-def on_less_than_2_0?
-  RUBY_VERSION < "2.0.0"
-end
-
-def on_less_than_2_3?
-  RUBY_VERSION < "2.3.0"
-end

spec/spec_helper.rb

@@ -1,16 +1,13 @@
-require File.expand_path("on_what", File.dirname(File.dirname(__FILE__)))
-
 # Code coverage (via SimpleCov)
 begin
   require "simplecov"
   SimpleCov.start do
     add_filter "/spec/"      # exclude test code
     add_filter "/vendor/"    # exclude gems which are vendored on Travis CI
-    add_filter "/on_what.rb" # exclude help used only in gemspec
   end
 
   # On CI we publish simplecov results to codecov.io
-  if on_travis?
+  if ENV["CI"] == "true"
     require "codecov"
     SimpleCov.formatter = SimpleCov::Formatter::Codecov
   end