cut_release.rake

# frozen_string_literal: true

require 'bump'

namespace :cut_release do
  %w[major minor patch pre].each do |release_type|
    desc "Cut a new #{release_type} release, create release notes " \
         'and update documents.'
    task release_type => 'changelog:check_clean' do
      run(release_type)
    end
  end

  def version_sans_patch(version)
    version.split('.').take(2).join('.')
  end

  def update_readme(old_version, new_version)
    readme = File.read('README.md')

    File.open('README.md', 'w') do |f|
      f << readme.sub(
        "gem 'rubocop', '~> #{old_version}', require: false",
        "gem 'rubocop', '~> #{new_version}', require: false"
      )
    end
  end

  def update_docs(old_version, new_version)
    antora_metadata = File.read('docs/antora.yml')

    File.open('docs/antora.yml', 'w') do |f|
      f << antora_metadata.sub(
        "version: 'master'",
        "version: '#{version_sans_patch(new_version)}'"
      )
    end

    installation = File.read('docs/modules/ROOT/pages/installation.adoc')

    File.open('docs/modules/ROOT/pages/installation.adoc', 'w') do |f|
      f << installation.sub(
        "gem 'rubocop', '~> #{old_version}', require: false",
        "gem 'rubocop', '~> #{new_version}', require: false"
      )
    end
  end

  def update_issue_template(old_version, new_version)
    issue_template = File.read('.github/ISSUE_TEMPLATE/bug_report.md')

    File.open('.github/ISSUE_TEMPLATE/bug_report.md', 'w') do |f|
      f << issue_template.sub(
        "#{old_version} (using Parser ",
        "#{new_version} (using Parser "
      )
    end
  end

  def add_header_to_changelog(version)
    changelog = File.read('CHANGELOG.md')
    head, tail = changelog.split("## master (unreleased)\n\n", 2)

    File.open('CHANGELOG.md', 'w') do |f|
      f << head
      f << "## master (unreleased)\n\n"
      f << "## #{version} (#{Time.now.strftime('%F')})\n\n"
      f << tail
    end
  end

  def create_release_notes(version)
    release_notes = new_version_changes.strip
    contributor_links = user_links(release_notes)

    File.open("relnotes/v#{version}.md", 'w') do |file|
      file << release_notes
      file << "\n\n"
      file << contributor_links
      file << "\n"
    end
  end

  def new_version_changes
    changelog = File.read('CHANGELOG.md')
    _, _, new_changes, _older_changes = changelog.split(/^## .*$/, 4)
    new_changes
  end

  def user_links(text)
    names = text.scan(/\[@(\S+)\]\[\]/).map(&:first).uniq
    names.map { |name| "[@#{name}]: https://github.com/#{name}" }
         .join("\n")
  end

  def run(release_type)
    old_version = Bump::Bump.current
    Bump::Bump.run(release_type, commit: false, bundle: false, tag: false)
    new_version = Bump::Bump.current

    update_readme(old_version, new_version)
    update_docs(old_version, new_version)
    update_issue_template(old_version, new_version)
    add_header_to_changelog(new_version)
    create_release_notes(new_version)

    puts "Changed version from #{old_version} to #{new_version}."
  end
end