Remove support to old rubies

Author: rafaelfranca

.travis.yml

@@ -2,11 +2,6 @@ language: ruby
 cache: bundler
 sudo: false
 rvm:
-  - 1.9.3 # when removed, get rid of the before_script hack and also the one in application_generator.rb
-  - 2.0.0
-  - 2.1.10
-  - 2.2.10
-  - 2.3.8
   - 2.4.6
   - 2.5.5
   - 2.6.3
@@ -17,25 +12,7 @@ env:
   - RAILS_VERSION="~> 5.1.0"
   - RAILS_VERSION="~> 5.2.0"
 matrix:
-  exclude: # Rails 5 is incompatible with Ruby < 2.2.2
-    - rvm: 1.9.3
-      env: RAILS_VERSION="~> 5.0.0"
-    - rvm: 2.0.0
-      env: RAILS_VERSION="~> 5.0.0"
-    - rvm: 2.1.10
-      env: RAILS_VERSION="~> 5.0.0"
-    - rvm: 1.9.3
-      env: RAILS_VERSION="~> 5.1.0"
-    - rvm: 2.0.0
-      env: RAILS_VERSION="~> 5.1.0"
-    - rvm: 2.1.10
-      env: RAILS_VERSION="~> 5.1.0"
-    - rvm: 1.9.3
-      env: RAILS_VERSION="~> 5.2.0"
-    - rvm: 2.0.0
-      env: RAILS_VERSION="~> 5.2.0"
-    - rvm: 2.1.10
-      env: RAILS_VERSION="~> 5.2.0"
+  exclude:
     - rvm: 2.6.3
       env: RAILS_VERSION="~> 4.2.0"
   allow_failures:
@@ -45,6 +22,4 @@ before_install:
   - gem update --system 3.0.3
   - gem uninstall bundler && gem install bundler -v 1.17.3
 before_script:
-  - "[ $TRAVIS_RUBY_VERSION = \"1.9.3\" ] && travis_retry gem install mime-types --version \"~> 2\" || true"
-  - "[ $TRAVIS_RUBY_VERSION = \"1.9.3\" -o $TRAVIS_RUBY_VERSION = \"2.0.0\" ] && travis_retry gem install nokogiri --version \"~> 1.6.8\" || true"
   - travis_retry gem install rails --version "$RAILS_VERSION"

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## Next release
 
+* Drop support to Ruby 1.9, 2.0, 2.1, and 2.3
 * Fix binstubs not being replaced when their quoting style was changed (#534)
 * Preserve comments right after the shebang line which might include magic comments such as `frozen_string_literal: true'
 * Fix binstub failures when Bundler's `BUNDLE_APP_CONFIG` environment variable is present (#545)

lib/spring/test/application_generator.rb

@@ -38,11 +38,6 @@ def generate
 
       # Sporadic SSL errors keep causing test failures so there are anti-SSL workarounds here
       def generate_files
-        if RUBY_VERSION == "1.9.3"
-          system("gem list '^mime-types$' --installed --version '~> 2' || " \
-                   "gem install mime-types --clear-sources --source http://rubygems.org --version '~> 2'")
-        end
-
         system("gem list '^rails$' --installed --version '#{version_constraint}' || " \
                  "gem install rails --clear-sources --source http://rubygems.org --version '#{version_constraint}'")
 
@@ -94,21 +89,8 @@ def generate_if_missing
       def install_spring
         return if @installed
 
-        if RUBY_VERSION < "2.2.2"
-          application.run! "gem install activesupport --version '#{version}'"
-        end
-
         build_and_install_gems
 
-        # TO prevent nokogiri install error in application.bundle.
-        if RUBY_VERSION < "2.1.0"
-          append_to_file(application.gemfile, "gem 'nokogiri', '~> 1.6.8'")
-        end
-
-        if RUBY_VERSION < "1.9"
-          append_to_file(application.gemfile, "gem 'rake', '12.2.1'")
-        end
-
         application.bundle
 
         FileUtils.rm_rf application.path("bin")

spring.gemspec

@@ -13,6 +13,8 @@ Gem::Specification.new do |gem|
   gem.files         = Dir["LICENSE.txt", "README.md", "lib/**/*", "bin/*"]
   gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
 
+  gem.required_ruby_version = ">= 2.4.0"
+
   gem.add_development_dependency 'rake'
   gem.add_development_dependency 'bump'
   gem.add_development_dependency 'activesupport'