# File lib/rubygems/command_manager.rb, line 20
20:     def self.instance
21:       @command_manager ||= CommandManager.new
22:     end

    # File lib/rubygems/command_manager.rb, line 25
25:     def initialize
26:       @commands = {}
27:       register_command :build
28:       register_command :cert
29:       register_command :check
30:       register_command :cleanup
31:       register_command :contents
32:       register_command :dependency
33:       register_command :environment
34:       register_command :fetch
35:       register_command :generate_index
36:       register_command :help
37:       register_command :install
38:       register_command :list
39:       register_command :lock
40:       register_command :mirror
41:       register_command :outdated
42:       register_command :pristine
43:       register_command :query
44:       register_command :rdoc
45:       register_command :search
46:       register_command :server
47:       register_command :sources
48:       register_command :specification
49:       register_command :stale
50:       register_command :uninstall
51:       register_command :unpack
52:       register_command :update
53:       register_command :which
54:     end

    # File lib/rubygems/command_manager.rb, line 62
62:     def [](command_name)
63:       command_name = command_name.intern
64:       return nil if @commands[command_name].nil?
65:       @commands[command_name] ||= load_and_instantiate(command_name)
66:     end

    # File lib/rubygems/command_manager.rb, line 69
69:     def command_names
70:       @commands.keys.collect {|key| key.to_s}.sort
71:     end

     # File lib/rubygems/command_manager.rb, line 109
109:     def find_command(cmd_name)
110:       possibilities = find_command_possibilities(cmd_name)
111:       if possibilities.size > 1
112:         raise "Ambiguous command #{cmd_name} matches [#{possibilities.join(', ')}]"
113:       end
114:       if possibilities.size < 1
115:         raise "Unknown command #{cmd_name}"
116:       end
117: 
118:       self[possibilities.first]
119:     end

     # File lib/rubygems/command_manager.rb, line 121
121:     def find_command_possibilities(cmd_name)
122:       len = cmd_name.length
123:       self.command_names.select { |n| cmd_name == n[0,len] }
124:     end

     # File lib/rubygems/command_manager.rb, line 86
 86:     def process_args(args)
 87:       args = args.to_str.split(/\s+/) if args.respond_to?(:to_str)
 88:       if args.size == 0
 89:         say Gem::Command::HELP
 90:         terminate_interaction(1)
 91:       end 
 92:       case args[0]
 93:       when '-h', '--help'
 94:         say Gem::Command::HELP
 95:         terminate_interaction(0)
 96:       when '-v', '--version'
 97:         say Gem::RubyGemsVersion
 98:         terminate_interaction(0)
 99:       when /^-/
100:         alert_error "Invalid option: #{args[0]}.  See 'gem --help'."
101:         terminate_interaction(1)
102:       else
103:         cmd_name = args.shift.downcase
104:         cmd = find_command(cmd_name)
105:         cmd.invoke(*args)
106:       end
107:     end

    # File lib/rubygems/command_manager.rb, line 57
57:     def register_command(command_obj)
58:       @commands[command_obj] = false
59:     end

    # File lib/rubygems/command_manager.rb, line 74
74:     def run(args)
75:       process_args(args)
76:     rescue StandardError, Timeout::Error => ex
77:       alert_error "While executing gem ... (#{ex.class})\n    #{ex.to_s}"
78:       ui.errs.puts "\t#{ex.backtrace.join "\n\t"}" if
79:         Gem.configuration.backtrace
80:       terminate_interaction(1)
81:     rescue Interrupt
82:       alert_error "Interrupted"
83:       terminate_interaction(1)
84:     end