Class: Nanoc::Opal::Filter

Inherits:
Filter
  • Object
show all
Defined in:
lib/nanoc/opal/filter.rb

Instance Method Summary collapse

Instance Method Details

#run(string, params = {}) ⇒ String

Runs the content through [Opal](opalrb.com). Parameters passed as ‘:args` will be passed on to Opal..



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# File 'lib/nanoc/opal/filter.rb', line 14

def run(string, params = {})
  params = params.dup

  # Add current directory to the load path or something else if `load_path`
  # param is provided.
  ident = item.identifier.to_s
  fn = item.raw_filename
  dirname = File.dirname(fn)
  paths = params.delete(:load_path) || [dirname]
  paths = ::Opal.paths + paths
  params[:path_reader] = ::Opal::PathReader.new(
    paths,
    ::Opal::Builder.extensions.map { |e| [".#{e}", ".js.#{e}"] }.flatten
  )

  builder = ::Opal::Builder.new(**params)
  builder.build_str(string, fn)
  code = builder.to_s + "\n" + builder.source_map.to_data_uri_comment

  prefix = File.dirname(item.identifier.to_s)
  prefix += '/' unless prefix.end_with? '/'

  # Build a dependency chain
  dependencies = builder.dependent_files
  # Select only those required files that are present in our filesystem
  dependencies = dependencies.select { |i| i.start_with?(dirname) }
  # Remove the directory part up to a location of our asset
  dependencies = dependencies.map { |i| i.gsub(/\A#{dirname}\//, '') }
  # Add a prefix of our main asset (eg. /assets/js/)
  dependencies = dependencies.map { |i| prefix + i }
  # Convert that to Nanoc items
  dependencies = dependencies.map { |i| items[i] }.compact
  # Reject itself
  dependencies = dependencies.reject { |i| i == item }

  depend_on dependencies

  code
end