1 files changed, 103 insertions, 0 deletions
diff --git a/app/helpers/gitlab/labels_helper.rb b/app/helpers/gitlab/labels_helper.rb
new file mode 100644
index 00000000000..aa16d71f42c
--- /dev/null
+++ b/app/helpers/gitlab/labels_helper.rb
@@ -0,0 +1,103 @@
+module Gitlab
+  module LabelsHelper
+    include ActionView::Helpers::TagHelper
+
+    # Link to a Label
+    #
+    # label   - Label object to link to
+    # project - Project object which will be used as the context for the label's
+    #           link. If omitted, defaults to `@project`, or the label's own
+    #           project.
+    # block   - An optional block that will be passed to `link_to`, forming the
+    #           body of the link element. If omitted, defaults to
+    #           `render_colored_label`.
+    #
+    # Examples:
+    #
+    #   # Allow the generated link to use the label's own project
+    #   link_to_label(label)
+    #
+    #   # Force the generated link to use @project
+    #   @project = Project.first
+    #   link_to_label(label)
+    #
+    #   # Force the generated link to use a provided project
+    #   link_to_label(label, project: Project.last)
+    #
+    #   # Customize link body with a block
+    #   link_to_label(label) { "My Custom Label Text" }
+    #
+    # Returns a String
+    def link_to_label(label, project: nil, &block)
+      project ||= @project || label.project
+      link = namespace_project_issues_path(project.namespace, project,
+                                           label_name: label.name)
+
+      if block_given?
+        link_to link, &block
+      else
+        link_to render_colored_label(label), link
+      end
+    end
+
+    def project_label_names
+      @project.labels.pluck(:title)
+    end
+
+    def render_colored_label(label)
+      label_color = label.color || Label::DEFAULT_COLOR
+      text_color = text_color_for_bg(label_color)
+
+      # Intentionally not using content_tag here so that this method can be called
+      # by LabelReferenceFilter
+      span = %(<span class="label color-label") +
+        %( style="background-color: #{label_color}; color: #{text_color}">) +
+        escape_once(label.name) + '</span>'
+
+      span.html_safe
+    end
+
+    def suggested_colors
+      [
+        '#0033CC',
+        '#428BCA',
+        '#44AD8E',
+        '#A8D695',
+        '#5CB85C',
+        '#69D100',
+        '#004E00',
+        '#34495E',
+        '#7F8C8D',
+        '#A295D6',
+        '#5843AD',
+        '#8E44AD',
+        '#FFECDB',
+        '#AD4363',
+        '#D10069',
+        '#CC0033',
+        '#FF0000',
+        '#D9534F',
+        '#D1D100',
+        '#F0AD4E',
+        '#AD8D43'
+      ]
+    end
+
+    def text_color_for_bg(bg_color)
+      r, g, b = bg_color.slice(1,7).scan(/.{2}/).map(&:hex)
+
+      if (r + g + b) > 500
+        '#333333'
+      else
+        '#FFFFFF'
+      end
+    end
+
+    def project_labels_options(project)
+      options_from_collection_for_select(project.labels, 'name', 'name', params[:label_name])
+    end
+
+    # Required for Gitlab::Markdown::LabelReferenceFilter
+    module_function :render_colored_label, :text_color_for_bg, :escape_once
+  end
+end