1 files changed, 46 insertions, 0 deletions
diff --git a/railties/lib/rails/commands/profiler.rb b/railties/lib/rails/commands/profiler.rb
new file mode 100644
index 0000000000..6d9717b5cd
--- /dev/null
+++ b/railties/lib/rails/commands/profiler.rb
@@ -0,0 +1,46 @@
+if [nil, "-h", "--help"].include?(ARGV.first)
+  $stderr.puts "Usage: rails profiler 'Person.expensive_method(10)' [times] [flat|graph|graph_html]"
+  exit(1)
+end
+
+# Define a method to profile.
+if ARGV[1] and ARGV[1].to_i > 1
+  eval "def profile_me() #{ARGV[1]}.times { #{ARGV[0]} } end"
+else
+  eval "def profile_me() #{ARGV[0]} end"
+end
+
+# Use the ruby-prof extension if available.  Fall back to stdlib profiler.
+begin
+  begin
+    require "ruby-prof"
+    $stderr.puts 'Using the ruby-prof extension.'
+    RubyProf.measure_mode = RubyProf::WALL_TIME
+    RubyProf.start
+    profile_me
+    results = RubyProf.stop
+    if ARGV[2]
+      printer_class = RubyProf.const_get((ARGV[2] + "_printer").classify)
+    else
+      printer_class = RubyProf::FlatPrinter
+    end
+    printer = printer_class.new(results)
+    printer.print($stderr)
+  rescue LoadError
+    require "prof"
+    $stderr.puts 'Using the old ruby-prof extension.'
+    Prof.clock_mode = Prof::GETTIMEOFDAY
+    Prof.start
+    profile_me
+    results = Prof.stop
+    require 'rubyprof_ext'
+    Prof.print_profile(results, $stderr)
+  end
+rescue LoadError
+  require 'profiler'
+  $stderr.puts 'Using the standard Ruby profiler.'
+  Profiler__.start_profile
+  profile_me
+  Profiler__.stop_profile
+  Profiler__.print_profile($stderr)
+end