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PAL.C.T MINI SHELL
files >> /usr/lib/ruby/site_ruby/1.8/rubygems/commands/
upload
files >> //usr/lib/ruby/site_ruby/1.8/rubygems/commands/which_command.rb

require 'rubygems/command'
require 'rubygems/gem_path_searcher'

class Gem::Commands::WhichCommand < Gem::Command

  EXT = %w[.rb .rbw .so .dll .bundle] # HACK

  def initialize
    super 'which', 'Find the location of a library file you can require',
          :search_gems_first => false, :show_all => false

    add_option '-a', '--[no-]all', 'show all matching files' do |show_all, options|
      options[:show_all] = show_all
    end

    add_option '-g', '--[no-]gems-first',
               'search gems before non-gems' do |gems_first, options|
      options[:search_gems_first] = gems_first
    end
  end

  def arguments # :nodoc:
    "FILE          name of file to find"
  end

  def defaults_str # :nodoc:
    "--no-gems-first --no-all"
  end

  def execute
    searcher = Gem::GemPathSearcher.new

    found = false

    options[:args].each do |arg|
      dirs = $LOAD_PATH
      spec = searcher.find arg

      if spec then
        if options[:search_gems_first] then
          dirs = gem_paths(spec) + $LOAD_PATH
        else
          dirs = $LOAD_PATH + gem_paths(spec)
        end
      end

      paths = find_paths arg, dirs

      if paths.empty? then
        alert_error "Can't find ruby library file or shared library #{arg}"
      else
        say paths
        found = true
      end
    end

    terminate_interaction 1 unless found
  end

  def find_paths(package_name, dirs)
    result = []

    dirs.each do |dir|
      EXT.each do |ext|
        full_path = File.join dir, "#{package_name}#{ext}"
        if File.exist? full_path then
          result << full_path
          return result unless options[:show_all]
        end
      end
    end

    result
  end

  def gem_paths(spec)
    spec.require_paths.collect { |d| File.join spec.full_gem_path, d }
  end

  def usage # :nodoc:
    "#{program_name} FILE [FILE ...]"
  end

end
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