gitlab-org--gitlab-foss/app/helpers/labels_helper.rb

module LabelsHelper
  def project_label_names
    @project.labels.pluck(:title)
  end

  def render_colored_label(label)
    label_color = label.color || "#428bca"
    r, g, b = label_color.slice(1,7).scan(/.{2}/).map(&:hex)

    if (r + g + b) > 500
      text_color = "#333"
    else
      text_color = "#FFF"
    end

    content_tag :span, class: 'label', style: "background:#{label_color};color:#{text_color}" do
      label.name
    end
  end
end