Module: Horza::DependencyLoading

Extended by:
DependencyLoading
Included in:
DependencyLoading
Defined in:
lib/horza/dependency_loading.rb

Constant Summary collapse

Error = 
Class.new(StandardError)
MissingFile = 
Class.new(Error)

Instance Method Summary collapse

Instance Method Details

#constant_name_for_path(file_path) ⇒ Object 



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# File 'lib/horza/dependency_loading.rb', line 37

def constant_name_for_path(file_path)
  ActiveSupport::Dependencies.loadable_constants_for_path(
    file_path, Horza.constant_paths
  ).tap do |loadables|
    if loadables.many?
      raise "It seems that your registered constant file paths are not setup correctly " +
             "and would cause Horza to try and load the following constants:\n\n #{loadables.map(&:inspect).join(', ')}"
    end
  end
end

#resolve_dependency(entity_name) ⇒ Object 



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# File 'lib/horza/dependency_loading.rb', line 8

def resolve_dependency(entity_name)
  file_name = entity_name.to_s.underscore
  # Search for a matching filename in #constant_paths
  # and try to load a constant that matches.
  resolve_from_file_paths(file_name)
end

#resolve_from_file_paths(entity_name) ⇒ Object 



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# File 'lib/horza/dependency_loading.rb', line 15

def resolve_from_file_paths(entity_name)
  if Horza.constant_paths.empty?
    # try in current scope, even with no lookup paths configured
    begin
      entity_name.capitalize.constantize
    rescue NameError
      raise ArgumentError.new("No file paths configured to lookup constants")
    end
  else
    file_path = search_for_file(entity_name)

    resolved_name = constant_name_for_path(file_path).first

    if resolved_name.nil?
      Error.new("No constant found for: #{entity_name.inspect}")
    else
      ActiveSupport::Dependencies::Reference.safe_get(resolved_name)
    end
  end
end

#search_for_file(path_suffix) ⇒ Object

Search for a file matching the provided suffix. This recursively checks directories in the #Horza.constant_paths for matches.

Raises:



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# File 'lib/horza/dependency_loading.rb', line 50

def search_for_file(path_suffix)
  path_suffix = path_suffix.sub(/(\.rb)?$/, ".rb")

  Horza.constant_paths.each do |root|
    Dir.glob(File.join(root, "**/")).each do |dir|
      path = File.join(dir, path_suffix)
      return path if File.file? path
    end
  end

  raise MissingFile.new(
    "No matching file found for: '#{path_suffix.sub(/(\.rb)?$/, "")}'\n" +
    "Searched in: (#{Horza.constant_paths.map(&:inspect).join(', ')})"
  )
end