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