limit print_comparison method into compare methord

lib/benchmark/compare.rb

@@ -56,51 +56,49 @@ module Compare
     def compare(*entries, order: :fastest)
       return if entries.size < 2
 
-      case order
-      when :baseline
-        baseline = entries.shift
-        sorted = entries.sort_by{ |e| e.stats.central_tendency }.reverse
-      when :fastest
-        sorted = entries.sort_by{ |e| e.stats.central_tendency }.reverse
-        baseline = sorted.shift
-      else
-        raise ArgumentError, "Unknwon order: #{order.inspect}"
-      end
-
-      $stdout.puts "\nComparison:"
+      sorted, baseline = sort_and_find_baseline(entries, order)
 
-      $stdout.printf "%20s: %10.1f i/s\n", baseline.label.to_s, baseline.stats.central_tendency
+      puts "\nComparison:"
+      printf "%20s: %10.1f i/s\n", baseline.label.to_s, baseline.stats.central_tendency
 
       sorted.each do |report|
         name = report.label.to_s
+        printf "%20s: %10.1f i/s - ", name, report.stats.central_tendency
 
-        $stdout.printf "%20s: %10.1f i/s - ", name, report.stats.central_tendency
+        report_speedup, report_error = report.stats.compare_speed(baseline.stats)
 
-        if report.stats.overlaps?(baseline.stats)
-          $stdout.print "same-ish: difference falls within error"
-        elsif report.stats.central_tendency > baseline.stats.central_tendency
-          speedup, error = report.stats.speedup(baseline.stats)
-          $stdout.printf "%.2fx ", speedup
-          if error
-            $stdout.printf " (± %.2f)", error
-          end
-          $stdout.print " faster"
+        if report_error
+          printf "%.2fx (± %.2f) %s", report_speedup.abs, report_error, report_speedup > 0 ? "faster" : "slower"
+        elsif report_speedup.abs < 1e-9
+          print "same-ish: difference falls within error"
         else
-          slowdown, error = report.stats.slowdown(baseline.stats)
-          $stdout.printf "%.2fx ", slowdown
-          if error
-            $stdout.printf " (± %.2f)", error
-          end
-          $stdout.print " slower"
+          printf "%.2fx %s", report_speedup.abs, report_speedup > 0 ? "faster" : "slower"
         end
 
-        $stdout.puts
+        puts
       end
 
-      footer = baseline.stats.footer
-      $stdout.puts footer.rjust(40) if footer
+      if (footer = baseline.stats.footer)
+        puts footer.rjust(40)
+      end
 
-      $stdout.puts
+      puts
+    end
+
+    private
+
+    def sort_and_find_baseline(entries, order)
+      case order
+      when :baseline
+        baseline = entries.shift
+        sorted = entries.sort_by { |e| e.stats.central_tendency }.reverse
+      when :fastest
+        sorted = entries.sort_by { |e| e.stats.central_tendency }.reverse
+        baseline = sorted.shift
+      else
+        raise ArgumentError, "Unknown order: #{order.inspect}"
+      end
+      [sorted, baseline]
     end
   end