# File lib/rubygems/commands/which_command.rb, line 4
 4:   def initialize
 5:     super 'which', 'Find the location of a library file you can require',
 6:           :search_gems_first => false, :show_all => false
 7: 
 8:     add_option '-a', '--[no-]all', 'show all matching files' do |show_all, options|
 9:       options[:show_all] = show_all
10:     end
11: 
12:     add_option '-g', '--[no-]gems-first',
13:                'search gems before non-gems' do |gems_first, options|
14:       options[:search_gems_first] = gems_first
15:     end
16:   end

    # File lib/rubygems/commands/which_command.rb, line 26
26:   def execute
27:     found = false
28: 
29:     options[:args].each do |arg|
30:       arg = arg.sub(/#{Regexp.union(*Gem.suffixes)}$/, '')
31:       dirs = $LOAD_PATH
32: 
33:       spec = Gem::Specification.find_by_path arg
34: 
35:       if spec then
36:         if options[:search_gems_first] then
37:           dirs = gem_paths(spec) + $LOAD_PATH
38:         else
39:           dirs = $LOAD_PATH + gem_paths(spec)
40:         end
41:       end
42: 
43:       # TODO: this is totally redundant and stupid
44:       paths = find_paths arg, dirs
45: 
46:       if paths.empty? then
47:         alert_error "Can't find ruby library file or shared library #{arg}"
48:       else
49:         say paths
50:         found = true
51:       end
52:     end
53: 
54:     terminate_interaction 1 unless found
55:   end

    # File lib/rubygems/commands/which_command.rb, line 57
57:   def find_paths(package_name, dirs)
58:     result = []
59: 
60:     dirs.each do |dir|
61:       Gem.suffixes.each do |ext|
62:         full_path = File.join dir, "#{package_name}#{ext}"
63:         if File.exist? full_path and not File.directory? full_path then
64:           result << full_path
65:           return result unless options[:show_all]
66:         end
67:       end
68:     end
69: 
70:     result
71:   end

    # File lib/rubygems/commands/which_command.rb, line 73
73:   def gem_paths(spec)
74:     spec.require_paths.collect { |d| File.join spec.full_gem_path, d }
75:   end