1 files changed, 21 insertions, 0 deletions
diff --git a/app/helpers/blame_helper.rb b/app/helpers/blame_helper.rb
new file mode 100644
index 00000000000..d1dc4d94560
--- /dev/null
+++ b/app/helpers/blame_helper.rb
@@ -0,0 +1,21 @@
+module BlameHelper
+  def age_map_duration(blame_groups, project)
+    now = Time.zone.now
+    start_date = blame_groups.map { |blame_group| blame_group[:commit].committed_date }
+      .append(project.created_at).min
+
+    {
+      now: now,
+      started_days_ago: (now - start_date).to_i / 1.day
+    }
+  end
+
+  def age_map_class(commit_date, duration)
+    commit_date_days_ago = (duration[:now] - commit_date).to_i / 1.day
+    # Numbers 0 to 10 come from this calculation, but only commits on the oldest
+    # day get number 10 (all other numbers can be multiple days), so the range
+    # is normalized to 0-9
+    age_group = [(10 * commit_date_days_ago) / duration[:started_days_ago], 9].min
+    "blame-commit-age-#{age_group}"
+  end
+end