Add BlobPresenter for highlighting

Force FoundBlob to use BlobPresenter

app/models/blob.rb

 # frozen_string_literal: true
 
-# Blob is a Rails-specific wrapper around Gitlab::Git::Blob objects
+# Blob is a Rails-specific wrapper around Gitlab::Git::Blob, SnippetBlob and Ci::ArtifactBlob
 class Blob < SimpleDelegator
+  include Presentable
+
   CACHE_TIME = 60 # Cache raw blobs referred to by a (mutable) ref for 1 minute
   CACHE_TIME_IMMUTABLE = 3600 # Cache blobs referred to by an immutable reference for 1 hour
 

app/presenters/blob_presenter.rb

+# frozen_string_literal: true
+
+class BlobPresenter < Gitlab::View::Presenter::Simple
+  presents :blob
+
+  def highlight(plain: nil)
+    Gitlab::Highlight.highlight(
+      blob.path,
+      blob.data,
+      language: blob.language_from_gitattributes,
+      plain: (plain || blob.no_highlighting?)
+    )
+  end
+end

lib/gitlab/search_results.rb

@@ -4,6 +4,7 @@ module Gitlab
   class SearchResults
     class FoundBlob
       include EncodingHelper
+      include Presentable
 
       attr_reader :id, :filename, :basename, :ref, :startline, :data, :project_id
 
@@ -31,6 +32,10 @@ module Gitlab
       def language_from_gitattributes
         nil
       end
+
+      def present
+        super(presenter_class: BlobPresenter)
+      end
     end
 
     attr_reader :current_user, :query, :per_page

spec/presenters/blob_presenter_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe BlobPresenter, :seed_helper do
+  let(:repository) { Gitlab::Git::Repository.new('default', TEST_REPO_PATH, '') }
+
+  let(:git_blob) do
+    Gitlab::Git::Blob.find(
+      repository,
+      'fa1b1e6c004a68b7d8763b86455da9e6b23e36d6',
+      'files/ruby/regex.rb'
+    )
+  end
+  let(:blob) { Blob.new(git_blob) }
+
+  describe '#highlight' do
+    subject { described_class.new(blob) }
+
+    it 'returns highlighted content' do
+      expect(Gitlab::Highlight).to receive(:highlight).with('files/ruby/regex.rb', git_blob.data, plain: false, language: nil)
+
+      subject.highlight
+    end
+
+    context 'with :plain' do
+      it 'returns plain content when no_highlighting? is true' do
+        allow(blob).to receive(:no_highlighting?).and_return(true)
+
+        subject.highlight
+      end
+
+      it 'returns plain content when :plain is true' do
+        expect(Gitlab::Highlight).to receive(:highlight).with('files/ruby/regex.rb', git_blob.data, plain: true, language: nil)
+
+        subject.highlight(plain: true)
+      end
+
+      it 'returns plain content when :plain is false, but no_highlighting? is true' do
+        allow(blob).to receive(:no_highlighting?).and_return(true)
+
+        expect(Gitlab::Highlight).to receive(:highlight).with('files/ruby/regex.rb', git_blob.data, plain: true, language: nil)
+
+        subject.highlight(plain: false)
+      end
+    end
+
+    context 'gitlab-language contains a match' do
+      before do
+        allow(blob).to receive(:language_from_gitattributes).and_return('ruby')
+      end
+
+      it 'passes language to inner call' do
+        expect(Gitlab::Highlight).to receive(:highlight).with('files/ruby/regex.rb', git_blob.data, plain: false, language: 'ruby')
+
+        subject.highlight
+      end
+    end
+  end
+end