Class: Jekyll::J1LunrSearch::Indexer

Inherits:
Generator
  • Object
show all
Defined in:
lib/starter_web/_plugins/index/lunr.rb

Overview

noinspection RubyTooManyInstanceVariablesInspection,RubyInterpreter

Instance Method Summary collapse

Constructor Details

#initialize(config = {}) ⇒ Indexer

Returns a new instance of Indexer.



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# File 'lib/starter_web/_plugins/index/lunr.rb', line 25

def initialize(config = {})
  super(config)

  @mode = config['environment']
  @template = config['theme']

  @project_path                   = File.join(File.dirname(__FILE__)).sub('_plugins/index', '')
  @module_config_path             = File.join(@project_path, config['data_dir'], 'modules')
  @j1_config_path                 = config['data_dir']

  @j1_config                      = YAML::load(File.open(File.join(@j1_config_path, 'j1_config.yml')))
  @module_config_default          = YAML::load(File.open(File.join(@module_config_path, 'defaults', 'lunr.yml')))
  @module_config_user             = YAML::load(File.open(File.join(@module_config_path,'lunr.yml')))

  @module_config_default_settings = @module_config_default['defaults']
  @module_config_user_settings    = @module_config_user['settings']
  @module_config                  = @module_config_default_settings.merge!(@module_config_user_settings)

  @lunr_config = {
    'excludes' => [],
    'strip_index_html' => false,
    'min_length' => 3,
    'stopwords' => 'stopwords.txt',
    'fields' => {
      'title' => 10,
      'tagline' => 10,
      'tags' => 20,
      'categories' => 20,
      'description' => 20,
      'body' => 1
    }
  }.merge!(@module_config || {})

  @lunr_config.merge!(@j1_config['posts'])

  @module_dir = @lunr_config['module_dir']
  @index_dir  = @lunr_config['index_dir']
  @index_name = @lunr_config['index_name']

  # calculate the module path
  # if NO template GEM is used (dev system), @project_path points
  # in the project folder, otherwise (runtime system) to the Ruby
  # GEM installation folder!
  #
  if @template.nil?
    @project_path = File.join(File.dirname(__FILE__), '../../', @module_dir)
  else
    @gem_path    = `bundle info --path j1-template`
    @project_path = File.join(@gem_path.chomp, @module_dir)
  end

  @lunr_path = File.join(@project_path, 'lunr.min.js')
  raise "Could not find #{@lunr_path}" unless File.exist?(@lunr_path)

  # set NodeJS for JS runtime explicitely
  ExecJS.runtime = ExecJS::Runtimes::Node
  lunr_src = open(@lunr_path).read
  ctx = ExecJS.compile(lunr_src)

  @docs = {}
  @excludes = @lunr_config['excludes']

  # if web host supports index.html as default doc, then
  # optionally exclude it from the url
  #
  @strip_index_html = @lunr_config['strip_index_html']

  # @strip_categories configuration
  #
  @strip_categories = @lunr_config['category_blacklist']
  @stripped_categories = @strip_categories.join(',').gsub!(',', ' ')

  # stop word exclusion configuration
  #
  @min_length = @lunr_config['min_length']
  @stopwords_file = @lunr_config['stopwords']

end

Instance Method Details

#generate(site) ⇒ Object

Index all pages except pages matching any value in config or with frontmatter settings (exclude_from_search: true)



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# File 'lib/starter_web/_plugins/index/lunr.rb', line 107

def generate(site)

  @site = site
  index_dest = @site.instance_variable_get(:@dest)
  rebuild = @module_config['rebuild']
  index_file = index_dest + @module_config['index_file']

  if plugin_disabled?
    Jekyll.logger.info 'J1 Lunr:', 'disabled'
    return
  else
    Jekyll.logger.info 'J1 Lunr:', 'enabled'
    Jekyll.logger.info 'J1 Lunr:', 'generate search index'
  end

  if @module_config['rebuild'] == false
    if File.exist?(index_file)
      Jekyll.logger.info 'J1 Lunr:', 'rebuild index disabled'
      # Keep the index file from being cleaned by Jekyll
      #
      site.static_files << SearchIndexFile.new(site, site.dest, '/', @module_config['index_file'])
      return
    end
  end

  # gather posts and pages
  #
  items = pages_to_index(site)
  content_renderer = PageRenderer.new(site)
  # index = []
  # rebuild = @module_config['rebuild']

  index_js = open(@lunr_path).read

  # NOTE: all settings must be added within the index function
  #
  index_js << 'var idx = lunr(function() {'

  @lunr_config['fields'].each_pair do |name, boost|
      index_js << "this.field('#{name}', {'boost': #{boost}});"
  end

  items.each_with_index do |item, i|
    entry = SearchEntry.create(item, content_renderer)

    entry.strip_index_suffix_from_url! if @strip_index_html
    entry.strip_stopwords!(stopwords, @min_length) if File.exist?(@stopwords_file)

    doc = {
      'id'          => i,
      'title'       => entry.title,
      'tagline'     => entry.tagline,
      'url'         => entry.url,
      'date'        => entry.date,
      'tags'        => entry.tags,
      'categories'  => entry.categories,
      'description' => entry.description,
      'is_post'     => entry.is_post,
      'body'        => entry.body
    }

    # remove unwanted categories (if any)
    #
    doc['categories'] -= @strip_categories unless doc['categories'] == nil

    index_js << 'this.add(' << ::JSON.generate(doc, quirks_mode: true) << ');'

    # reduce the size of the doc array by deleting the body key
    #
    doc.delete('body')
    @docs[i] = doc

  end
  index_js << '});'


  filename  = File.join(@index_dir, "#{@index_name}")
  ctx       = ExecJS.compile(index_js)
  index     = ctx.eval('JSON.stringify(idx)')

  total     = {
    'docs'  => @docs,
    'index' => ::JSON.parse(index, {:max_nesting => false})
  }
  filepath  = File.join(site.dest, filename)

  # create data path if not already exists
  #
  FileUtils.mkdir_p(File.dirname(filepath))
  File.open(filepath, 'w') { |f| f.write(JSON.dump(total)) }
#       Jekyll.logger.info 'J1 Lunr:', "finished, index ready."
  added_files = [filename]

  # Keep the written files from being cleaned by Jekyll
  #
  added_files.each do |fname|
    site.static_files << SearchIndexFile.new(site, site.dest, '/', fname)
  end
end