#! /usr/bin/env ruby

# == Synopsis
#
# Profiles a Ruby program.
#
# == Usage
#
# ruby_prof [options] <script.rb> [--] [script-options]"
#
# Options:
#     -p, --printer=printer            Select a printer:
#                                        flat - Prints a flat profile as text (default).
#                                        flat_with_line_numbers - Above, with line numbers
#                                        graph - Prints a graph profile as text.
#                                        graph_html - Prints a graph profile as html.
#                                        call_tree - format for KCacheGrind
#     -f, --file=path                  Output results to a file instead of standard out.
#     -m, --min_percent=min_percent    The minimum percent a method must take before ',
#                                      being included in output reports.  Should be an
#                                      integer between 1 and 100.  0 means all methods are printed.
#         --mode=measure_mode          Select a measurement mode:
#                                        process - Use process time (default).
#                                        wall - Use wall time.
#                                        cpu - Use the CPU clock counter
#                                              (only supported on Pentium and PowerPCs).
#                                        allocations - Tracks object allocations
#                                              (requires a patched Ruby interpreter).
#                                        memory - Tracks total memory size
#                                              (requires a patched Ruby interpreter).
#                                        gc_runs - Tracks number of garbage collection runs
#                                              (requires a patched Ruby interpreter).
#                                        gc_time - Tracks time spent doing garbage collection
#                                              (requires a patched Ruby interpreter).
#         --replace-progname           Replace $0 when loading the .rb files.
#         --specialized-instruction    Turn on specialized instruction.
#     -h, --help                       Show help message
#         --version                    Show version
#     -v                               Show version, set $VERBOSE to true, run file
#     -d                               Set $DEBUG to true
# 
#
# See also: {flat profiles}[link:files/examples/flat_txt.html], {graph profiles}[link:files/examples/graph_txt.html], {html graph profiles}[link:files/examples/graph_html.html]
#

require 'ostruct'
require 'optparse'
require 'ruby-prof'

options = OpenStruct.new
options.measure_mode = RubyProf::PROCESS_TIME
options.printer = RubyProf::FlatPrinter
options.min_percent = 0
options.file = nil
options.replace_prog_name = false
options.specialized_instruction = false

opts = OptionParser.new do |opts|
  opts.banner = "ruby_prof #{RubyProf::VERSION}\n" +
                "Usage: ruby_prof [options] <script.rb> [--] [script-options]"
 
  opts.separator ""
  opts.separator "Options:"

    
  opts.on('-p printer', '--printer=printer', [:flat, :flat_with_line_numbers, :graph, :graph_html, :call_tree],
          'Select a printer:',
          '  flat - Prints a flat profile as text (default).',
          '  flat_with_line_numbers - same as flat, with line numbers.',
          '  graph - Prints a graph profile as text.',
          '  graph_html - Prints a graph profile as html.',
          '  call_tree - format for KCacheGrind'
           ) do |printer|

          
    case printer
      when :flat
        options.printer = RubyProf::FlatPrinter
      when :flat_with_line_numbers
        options.printer = RubyProf::FlatPrinterWithLineNumbers
      when :graph
        options.printer = RubyProf::GraphPrinter
      when :graph_html
        options.printer = RubyProf::GraphHtmlPrinter
      when :call_tree
        options.printer = RubyProf::CallTreePrinter
    end
  end
    
  opts.on('-m min_percent', '--min_percent=min_percent', Float,
          'The minimum percent a method must take before ',
          '  being included in output reports.',
                                        '  this option is not supported for call tree.') do |min_percent|
    options.min_percent = min_percent
  end

  opts.on('-f path', '--file=path',
        'Output results to a file instead of standard out.') do |file|
    options.file = file
  end
    
  opts.on('--mode=measure_mode',
      [:process, :wall, :cpu, :allocations, :memory, :gc_runs, :gc_time],
      'Select what ruby-prof should measure:',
      '  process - Process time (default).',
      '  wall - Wall time.',
      '  cpu - CPU time (Pentium and PowerPCs only).',
      '  allocations - Object allocations (requires patched Ruby interpreter).',
      '  memory - Allocated memory in KB (requires patched Ruby interpreter).',
      '  gc_runs - Number of garbage collections (requires patched Ruby interpreter).',
      '  gc_time - Time spent in garbage collection (requires patched Ruby interpreter).') do |measure_mode|
      
      case measure_mode
      when :process
        options.measure_mode = RubyProf::PROCESS_TIME     
      when :wall
        options.measure_mode = RubyProf::WALL_TIME      
      when :cpu
        options.measure_mode = RubyProf::CPU_TIME
      when :allocations
        options.measure_mode = RubyProf::ALLOCATIONS
      when :memory
        options.measure_mode = RubyProf::MEMORY
      when :gc_runs
        options.measure_mode = RubyProf::GC_RUNS
      when :gc_time
        options.measure_mode = RubyProf::GC_TIME
      end
  end
        
  opts.on("--replace-progname", "Replace $0 when loading the .rb files.") do
          options.replace_prog_name = true
  end

  if defined?(VM)
    opts.on("--specialized-instruction", "Turn on specified instruction.") do
            options.specialized_instruction = true
    end
  end
    
  opts.on_tail("-h", "--help", "Show help message") do
      puts opts
      exit
  end
  
  opts.on_tail("--version", "Show version #{RubyProf::VERSION}") do
      puts "ruby_prof " + RubyProf::VERSION
      exit
  end
  
  opts.on("-v","Show version, set $VERBOSE to true, profile script") do
      puts "ruby_prof " + RubyProf::VERSION
      puts "ruby " + RUBY_DESCRIPTION
      $VERBOSE= true
  end
  
  opts.on("-d", "Set $DEBUG to true") do
    $DEBUG = true
  end
end

begin
  opts.parse! ARGV
rescue OptionParser::InvalidOption, OptionParser::InvalidArgument,
       OptionParser::MissingArgument => e
  puts opts
  puts
  puts e.message
  exit(-1)
end

# Make sure the user specified at least one file
if ARGV.length < 1
  puts opts
  puts ""
  puts "Must specify a script to run"
  exit(-1)
end


# Install at_exit handler.  It is important that we do this 
# before loading the scripts so our at_exit handler run
# *after* any other one that will be installed. 

at_exit {
  # Stop profiling
  result = RubyProf.stop

  # Create a printer
  printer = options.printer.new(result)

  # Get output
  if options.file
    File.open(options.file, 'w') do |file|
      printer.print(file, {:min_percent => options.min_percent})
    end
  else
    # Print out results 
    printer.print(STDOUT, {:min_percent => options.min_percent})
  end
}

# Now set measure mode
RubyProf.measure_mode = options.measure_mode

# Set VM compile option
if defined?(VM)
  VM::InstructionSequence.compile_option = {
    :trace_instruction => true,
    :specialized_instruction => options.specialized_instruction
  }
end

# Get the script we will execute
script = ARGV.shift
if options.replace_prog_name
  $0 = File.expand_path(script)
end

# Start profiling
RubyProf.start 

# Load the script
load script