# File lib/rubygems/commands/which_command.rb, line 8
 8:   def initialize
 9:     super 'which', 'Find the location of a library file you can require',
10:           :search_gems_first => false, :show_all => false
11: 
12:     add_option '-a', '--[no-]all', 'show all matching files' do |show_all, options|
13:       options[:show_all] = show_all
14:     end
15: 
16:     add_option '-g', '--[no-]gems-first',
17:                'search gems before non-gems' do |gems_first, options|
18:       options[:search_gems_first] = gems_first
19:     end
20:   end

    # File lib/rubygems/commands/which_command.rb, line 34
34:   def execute
35:     searcher = Gem::GemPathSearcher.new
36: 
37:     options[:args].each do |arg|
38:       dirs = $LOAD_PATH
39:       spec = searcher.find arg
40: 
41:       if spec then
42:         if options[:search_gems_first] then
43:           dirs = gem_paths(spec) + $LOAD_PATH
44:         else
45:           dirs = $LOAD_PATH + gem_paths(spec)
46:         end
47: 
48:         say "(checking gem #{spec.full_name} for #{arg})" if
49:           Gem.configuration.verbose
50:       end
51: 
52:       paths = find_paths arg, dirs
53: 
54:       if paths.empty? then
55:         say "Can't find ruby library file or shared library #{arg}"
56:       else
57:         say paths
58:       end
59:     end
60:   end

    # File lib/rubygems/commands/which_command.rb, line 62
62:   def find_paths(package_name, dirs)
63:     result = []
64: 
65:     dirs.each do |dir|
66:       EXT.each do |ext|
67:         full_path = File.join dir, "#{package_name}#{ext}"
68:         if File.exist? full_path then
69:           result << full_path
70:           return result unless options[:show_all]
71:         end
72:       end
73:     end
74: 
75:     result
76:   end

    # File lib/rubygems/commands/which_command.rb, line 78
78:   def gem_paths(spec)
79:     spec.require_paths.collect { |d| File.join spec.full_gem_path, d }
80:   end