Rakefile in facter-4.0.14 vs Rakefile in facter-4.0.15

@@ -5,5 +5,65 @@
 
 RSpec::Core::RakeTask.new(:spec)
 Dir.glob(File.join('tasks/**/*.rake')).each { |file| load file }
 
 task default: :spec
+
+def retrieve_from_keyboard
+  puts "Please provide the next release tag:\n"
+  next_version = $stdin.gets.chomp
+  raise(ArgumentError, ' The string that you entered is invalid!') unless /[0-9]+\.[0-9]+\.[0-9]+/.match?(next_version)
+
+  next_version
+end
+
+if Bundler.rubygems.find_name('github_changelog_generator').any?
+  require 'github_changelog_generator/task'
+
+  GitHubChangelogGenerator::RakeTask.new :changelog do |config|
+    if Rake.application.top_level_tasks.include?('changelog') &&
+       ENV['CHANGELOG_GITHUB_TOKEN'].nil?
+      raise 'Set CHANGELOG_GITHUB_TOKEN environment variable' /
+            " eg 'export CHANGELOG_GITHUB_TOKEN=valid_token_here'"
+    end
+
+    config.user = 'puppetlabs'
+    config.project = 'facter-ng'
+    config.since_tag = File.read('VERSION').strip
+    config.future_release = retrieve_from_keyboard
+    config.exclude_labels = ['maintenance']
+    config.add_pr_wo_labels = true
+    config.issues = false
+    config.max_issues = 100
+    config.header = ''
+    config.base = 'CHANGELOG.md'
+    config.merge_prefix = '### UNCATEGORIZED PRS; GO LABEL THEM'
+    config.configure_sections = {
+      "Changed": {
+        "prefix": '### Changed',
+        "labels": ['backwards-incompatible']
+      },
+      "Added": {
+        "prefix": '### Added',
+        "labels": ['feature']
+      },
+      "Fixed": {
+        "prefix": '### Fixed',
+        "labels": ['bugfix']
+      }
+    }
+  end
+else
+  desc 'Generate a Changelog from GitHub'
+  task :changelog do
+    raise <<~ERRORMESSAGE
+      The changelog tasks depends on github_changelog_generator gem.
+      Please install github_changelog_generator:
+      ---
+      Gemfile:
+        optional:
+          ':release':
+            - gem: 'github_changelog_generator'
+              condition: "Gem::Version.new(RUBY_VERSION.dup) >= Gem::Version.new('2.2.2')"
+    ERRORMESSAGE
+  end
+end