Generate a "TOTAL" row for build-profile table (#7614)

Merge pull request 7614

lib/jekyll/liquid_renderer/table.rb

@@ -3,6 +3,8 @@
 module Jekyll
   class LiquidRenderer
     class Table
+      GAUGES = [:count, :bytes, :time].freeze
+
       def initialize(stats)
         @stats = stats
       end
@@ -19,6 +21,8 @@ module Jekyll
         str = +"\n"
 
         table_head = data.shift
+        table_foot = data.pop
+
         str << generate_row(table_head, widths)
         str << generate_table_head_border(table_head, widths)
 
@@ -26,6 +30,9 @@ module Jekyll
           str << generate_row(row_data, widths)
         end
 
+        str << generate_table_head_border(table_foot, widths)
+        str << generate_row(table_foot, widths).rstrip
+
         str << "\n"
         str
       end
@@ -71,13 +78,16 @@ module Jekyll
         widths
       end
 
+      # rubocop:disable Metrics/AbcSize
       def data_for_table(num_of_rows)
         sorted = @stats.sort_by { |_, file_stats| -file_stats[:time] }
         sorted = sorted.slice(0, num_of_rows)
 
-        table = [%w(Filename Count Bytes Time)]
+        table  = [header_labels]
+        totals = Hash.new { |hash, key| hash[key] = 0 }
 
         sorted.each do |filename, file_stats|
+          GAUGES.each { |gauge| totals[gauge] += file_stats[gauge] }
           row = []
           row << filename
           row << file_stats[:count].to_s
@@ -86,7 +96,17 @@ module Jekyll
           table << row
         end
 
-        table
+        footer = []
+        footer << "TOTAL (for #{sorted.size} files)"
+        footer << totals[:count].to_s
+        footer << format_bytes(totals[:bytes])
+        footer << format("%.3f", totals[:time])
+        table  << footer
+      end
+      # rubocop:enable Metrics/AbcSize
+
+      def header_labels
+        GAUGES.map { |gauge| gauge.to_s.capitalize }.unshift("Filename")
       end
 
       def format_bytes(bytes)