# File lib/rubygems/commands/pristine_command.rb, line 11
11:   def initialize
12:     super 'pristine',
13:           'Restores installed gems to pristine condition from files located in the gem cache',
14:           :version => Gem::Requirement.default
15: 
16:     add_option('--all',
17:                'Restore all installed gems to pristine',
18:                'condition') do |value, options|
19:       options[:all] = value
20:     end
21: 
22:     add_version_option('restore to', 'pristine condition')
23:   end

    # File lib/rubygems/commands/pristine_command.rb, line 52
52:   def execute
53:     gem_name = nil
54: 
55:     specs = if options[:all] then
56:               Gem::SourceIndex.from_installed_gems.map do |name, spec|
57:                 spec
58:               end
59:             else
60:               gem_name = get_one_gem_name
61:               Gem::SourceIndex.from_installed_gems.find_name(gem_name,
62:                                                           options[:version])
63:             end
64: 
65:     if specs.empty? then
66:       raise Gem::Exception,
67:             "Failed to find gem #{gem_name} #{options[:version]}"
68:     end
69: 
70:     install_dir = Gem.dir # TODO use installer option
71: 
72:     raise Gem::FilePermissionError.new(install_dir) unless
73:       File.writable?(install_dir)
74: 
75:     say "Restoring gem(s) to pristine condition..."
76: 
77:     specs.each do |spec|
78:       gem = Dir[File.join(Gem.dir, 'cache', "#{spec.full_name}.gem")].first
79: 
80:       if gem.nil? then
81:         alert_error "Cached gem for #{spec.full_name} not found, use `gem install` to restore"
82:         next
83:       end
84: 
85:       # TODO use installer options
86:       installer = Gem::Installer.new gem, :wrappers => true, :force => true
87:       installer.install
88: 
89:       say "Restored #{spec.full_name}"
90:     end
91:   end