1 files changed, 17 insertions, 2 deletions
diff --git a/app/presenters/blob_presenter.rb b/app/presenters/blob_presenter.rb
index 2cf3278d240..f85c1a237a6 100644
--- a/app/presenters/blob_presenter.rb
+++ b/app/presenters/blob_presenter.rb
@@ -3,12 +3,13 @@
 class BlobPresenter < Gitlab::View::Presenter::Delegated
   presents :blob
 
-  def highlight(plain: nil)
+  def highlight(since: nil, to: nil, plain: nil)
     load_all_blob_data
 
     Gitlab::Highlight.highlight(
       blob.path,
-      blob.data,
+      limited_blob_data(since: since, to: to),
+      since: since,
       language: blob.language_from_gitattributes,
       plain: plain
     )
@@ -23,4 +24,18 @@ class BlobPresenter < Gitlab::View::Presenter::Delegated
   def load_all_blob_data
     blob.load_all_data! if blob.respond_to?(:load_all_data!)
   end
+
+  def limited_blob_data(since: nil, to: nil)
+    return blob.data if since.blank? || to.blank?
+
+    limited_blob_lines(since, to).join
+  end
+
+  def limited_blob_lines(since, to)
+    all_lines[since - 1..to - 1]
+  end
+
+  def all_lines
+    @all_lines ||= blob.data.lines
+  end
 end