Add profile:stackprof rake task.

.gitignore

@@ -7,3 +7,4 @@ pkg
 .ruby-version
 *.bundle
 /tmp
+Gemfile.lock

Gemfile

@@ -0,0 +1,3 @@
+source 'https://rubygems.org'
+
+gemspec

Rakefile

@@ -65,6 +65,10 @@ namespace :profile do
     ruby "./performance/profile.rb"
   end
 
+  task :stackprof do
+    ruby "./performance/stackprof.rb"
+  end
+
   desc "Run KCacheGrind"
   task :grind => :run  do
     system "qcachegrind /tmp/liquid.rubyprof_calltreeprinter.txt"

liquid.gemspec

@@ -26,4 +26,7 @@ Gem::Specification.new do |s|
   s.require_path = "lib"
 
   s.add_development_dependency 'rake-compiler'
+  s.add_development_dependency 'stackprof'
+  s.add_development_dependency 'rake'
+  s.add_development_dependency 'activesupport'
 end

performance/stackprof.rb

@@ -0,0 +1,15 @@
+require 'stackprof' rescue fail("install stackprof extension/gem")
+require File.dirname(__FILE__) + '/theme_runner'
+
+profiler = ThemeRunner.new
+profiler.run
+results = StackProf.run(mode: :cpu, out: ENV['FILENAME']) do
+  100.times do
+    profiler.run
+  end
+end
+if results.kind_of?(File)
+  puts "wrote stackprof dump to #{results.path}"
+else
+  StackProf::Report.new(results).print_text(false, 20)
+end