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 usage # :nodoc: "#{program_name} FILE [FILE ...]" end def execute searcher = Gem::GemPathSearcher.new 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 say "(checking gem #{spec.full_name} for #{arg})" if Gem.configuration.verbose end paths = find_paths arg, dirs if paths.empty? then say "Can't find ruby library file or shared library #{arg}" else say paths end end 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 [...]" end end