Implement backend gitlab ci dropdown

This commit builds on the groundwork in
ee008e300b1ec0abcc90e6a30816ec0754cea0dd, which refactored the backend
so the same code could be used for new dropdowns. In this commit its
used for templates for the `.gitlab-ci.yml` files.

1 files changed, 24 insertions, 11 deletions

diff --git a/lib/gitlab/template/base_template.rb b/lib/gitlab/template/base_template.rb
index e1cdfc8f5f6..652a496b57b 100644
--- a/lib/gitlab/template/base_template.rb
+++ b/lib/gitlab/template/base_template.rb
@@ -13,40 +13,53 @@ module Gitlab
         File.read(@path)
       end
 
+      def categories
+        raise NotImplementedError
+      end
+
+      def extension
+        raise NotImplementedError
+      end
+
+      def base_dir
+        raise NotImplementedError
+      end
+
       class << self
         def all
-          self.category_directories.flat_map do |dir|
-            templates_for_folder(dir)
-          end
+          self.categories.keys.flat_map { |cat| by_category(cat) }
         end
 
         def find(key)
           file_name = "#{key}#{self.extension}"
 
           directory = select_directory(file_name)
-          directory ? new(File.join(directory, file_name)) : nil
+          directory ? new(File.join(category_directory(directory), file_name)) : nil
         end
 
         def by_category(category)
-          templates_for_folder(categories[category])
+          templates_for_directory(category_directory(category))
         end
 
-        def category_directories
-          self.categories.values.map { |subdir| File.join(base_dir, subdir)}
+        def category_directory(category)
+          File.join(base_dir, categories[category])
         end
 
         private
 
         def select_directory(file_name)
-          category_directories.find { |dir| File.exist?(File.join(dir, file_name)) }
+          categories.keys.find do |category|
+            File.exist?(File.join(category_directory(category), file_name))
+          end
         end
 
-        def templates_for_folder(dir)
-          Dir.glob("#{dir.to_s}/*#{self.extension}").select { |f| f =~ filter_regex }.map { |f| new(f) }
+        def templates_for_directory(dir)
+          dir << '/' unless dir.end_with?('/')
+          Dir.glob(File.join(dir, "*#{self.extension}")).select { |f| f =~ filter_regex }.map { |f| new(f) }
         end
 
         def filter_regex
-          /#{Regexp.escape(extension)}\z/
+          @filter_reges ||= /#{Regexp.escape(extension)}\z/
         end
       end
     end