sider_rubocop_config_updater.rb

sider_rubocop_config_updater.rb

require 'bundler'
require 'yaml'

class SiderRuboCopConfigUpdater
  IGNORE_GEM_NAME_RE = /rubocop-(?:ast|portal)/.freeze

  def initialize(lock_fname: 'Gemfile.lock',
                 sider_fname: 'sider.yml')

    @lock_fname = lock_fname
    @sider_fname = sider_fname
  end

  def update!
    updated = updated_sider_settings

    File.open(@sider_fname, 'w') do |f|
      f.puts(updated)
    end
  end

  private

  def lockfile_cop_gem_entries
    lockfile = Bundler.read_file(@lock_fname)
    gem_specs = Bundler::LockfileParser.new(lockfile).specs

    cop_specs = gem_specs
      .select {|s| s.name =~ /^rubocop/ }
      .reject {|s| s.name.match(IGNORE_GEM_NAME_RE) }

    cop_specs.map do |cop|
      [cop.name, {
        'name' => cop.name,
        'version' => cop.version.to_s
      }]
    end.to_h
  end

  def sider_gem_entries
    raw_entries = sider_settings['linter']['rubocop']['gems']
    raw_entries.map {|e| [e['name'], e] }.to_h
  end

  def sider_settings
    @sider_settings ||= YAML.load_file(@sider_fname)
  end

  def updated_gem_entries
    sider_gem_entries
      .merge(lockfile_cop_gem_entries)
      .sort
      .to_h
      .values
  end

  def updated_sider_settings
    settings = sider_settings
    settings['linter']['rubocop']['gems'] = updated_gem_entries
    settings.to_yaml
  end
end

if $PROGRAM_NAME == __FILE__
  updater = SiderRuboCopConfigUpdater.new
  updater.update!
end