class JekyllReadmeIndex::Generator

def cleanup?
  option(CLEANUP_KEY) == true
end

def dir_has_index?(relative_path)
  relative_path << "/" unless relative_path.end_with? "/"
  regex = %r!^#{Regexp.escape(relative_path)}#{INDEX_REGEX}!i
  (site.pages + site.static_files).any? { |file| file.url =~ regex }
end

def disabled?
  option(ENABLED_KEY) == false
end

def generate(site)
  @site = site
  return if disabled?
  readmes.each do |readme|
    next unless should_be_index?(readme)
    site.pages << readme.to_page
    site.static_files.delete(readme) if cleanup?
  end
  if with_frontmatter?
    readmes_with_frontmatter.each do |readme|
      next unless should_be_index?(readme)
      readme.update_permalink
    end
  end
end

def initialize(site)
  @site = site
end

def markdown_converter
  @markdown_converter ||= site.find_converter_instance(Jekyll::Converters::Markdown)
end

def option(key)
  site.config[CONFIG_KEY] && site.config[CONFIG_KEY][key]
end

def readme_regex
  @readme_regex ||= %r!/readme(#{Regexp.union(markdown_converter.extname_list)})$!i
end

def readmes
  site.static_files.select { |file| file.relative_path =~ readme_regex }
end

def readmes_with_frontmatter
  site.pages.select { |file| ("/" + file.path) =~ readme_regex }
end

def should_be_index?(readme)
  return false unless readme
  !dir_has_index? File.dirname(readme.url)
end

def with_frontmatter?
  option(FRONTMATTER_KEY) == true
end