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+#--
+# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
+# All rights reserved.
+# See LICENSE.txt for permissions.
+#++
+
+require 'optparse'
+require 'rubygems/requirement'
+require 'rubygems/user_interaction'
+
+##
+# Base class for all Gem commands.  When creating a new gem command, define
+# #initialize, #execute, #arguments, #defaults_str, #description and #usage
+# (as appropriate).  See the above mentioned methods for details.
+#
+# A very good example to look at is Gem::Commands::ContentsCommand
+
+class Gem::Command
+
+  include Gem::UserInteraction
+
+  ##
+  # The name of the command.
+
+  attr_reader :command
+
+  ##
+  # The options for the command.
+
+  attr_reader :options
+
+  ##
+  # The default options for the command.
+
+  attr_accessor :defaults
+
+  ##
+  # The name of the command for command-line invocation.
+
+  attr_accessor :program_name
+
+  ##
+  # A short description of the command.
+
+  attr_accessor :summary
+
+  ##
+  # Arguments used when building gems
+
+  def self.build_args
+    @build_args ||= []
+  end
+
+  def self.build_args=(value)
+    @build_args = value
+  end
+
+  def self.common_options
+    @common_options ||= []
+  end
+
+  def self.add_common_option(*args, &handler)
+    Gem::Command.common_options << [args, handler]
+  end
+
+  def self.extra_args
+    @extra_args ||= []
+  end
+
+  def self.extra_args=(value)
+    case value
+    when Array
+      @extra_args = value
+    when String
+      @extra_args = value.split
+    end
+  end
+
+  ##
+  # Return an array of extra arguments for the command.  The extra arguments
+  # come from the gem configuration file read at program startup.
+
+  def self.specific_extra_args(cmd)
+    specific_extra_args_hash[cmd]
+  end
+
+  ##
+  # Add a list of extra arguments for the given command.  +args+ may be an
+  # array or a string to be split on white space.
+
+  def self.add_specific_extra_args(cmd,args)
+    args = args.split(/\s+/) if args.kind_of? String
+    specific_extra_args_hash[cmd] = args
+  end
+
+  ##
+  # Accessor for the specific extra args hash (self initializing).
+
+  def self.specific_extra_args_hash
+    @specific_extra_args_hash ||= Hash.new do |h,k|
+      h[k] = Array.new
+    end
+  end
+
+  ##
+  # Initializes a generic gem command named +command+.  +summary+ is a short
+  # description displayed in `gem help commands`.  +defaults+ are the default
+  # options.  Defaults should be mirrored in #defaults_str, unless there are
+  # none.
+  #
+  # When defining a new command subclass, use add_option to add command-line
+  # switches.
+  #
+  # Unhandled arguments (gem names, files, etc.) are left in
+  # <tt>options[:args]</tt>.
+
+  def initialize(command, summary=nil, defaults={})
+    @command = command
+    @summary = summary
+    @program_name = "gem #{command}"
+    @defaults = defaults
+    @options = defaults.dup
+    @option_groups = Hash.new { |h,k| h[k] = [] }
+    @parser = nil
+    @when_invoked = nil
+  end
+
+  ##
+  # True if +long+ begins with the characters from +short+.
+
+  def begins?(long, short)
+    return false if short.nil?
+    long[0, short.length] == short
+  end
+
+  ##
+  # Override to provide command handling.
+  #
+  # #options will be filled in with your parsed options, unparsed options will
+  # be left in <tt>options[:args]</tt>.
+  #
+  # See also: #get_all_gem_names, #get_one_gem_name,
+  # #get_one_optional_argument
+
+  def execute
+    raise Gem::Exception, "generic command has no actions"
+  end
+
+  ##
+  # Display to the user that a gem couldn't be found and reasons why
+  #--
+  # TODO: replace +domain+ with a parameter to suppress suggestions
+
+  def show_lookup_failure(gem_name, version, errors, domain)
+    if errors and !errors.empty?
+      msg = "Could not find a valid gem '#{gem_name}' (#{version}), here is why:\n"
+      errors.each { |x| msg << "          #{x.wordy}\n" }
+      alert_error msg
+    else
+      alert_error "Could not find a valid gem '#{gem_name}' (#{version}) in any repository"
+    end
+
+    unless domain == :local then # HACK
+      suggestions = Gem::SpecFetcher.fetcher.suggest_gems_from_name gem_name
+
+      unless suggestions.empty?
+        alert_error "Possible alternatives: #{suggestions.join(", ")}"
+      end
+    end
+  end
+
+  ##
+  # Get all gem names from the command line.
+
+  def get_all_gem_names
+    args = options[:args]
+
+    if args.nil? or args.empty? then
+      raise Gem::CommandLineError,
+            "Please specify at least one gem name (e.g. gem build GEMNAME)"
+    end
+
+    args.select { |arg| arg !~ /^-/ }
+  end
+
+  ##
+  # Get all [gem, version] from the command line.
+  #
+  # An argument in the form gem:ver is pull apart into the gen name and version,
+  # respectively.
+  def get_all_gem_names_and_versions
+    get_all_gem_names.map do |name|
+      if /\A(.*):(#{Gem::Requirement::PATTERN_RAW})\z/ =~ name
+        [$1, $2]
+      else
+        [name]
+      end
+    end
+  end
+
+  ##
+  # Get a single gem name from the command line.  Fail if there is no gem name
+  # or if there is more than one gem name given.
+
+  def get_one_gem_name
+    args = options[:args]
+
+    if args.nil? or args.empty? then
+      raise Gem::CommandLineError,
+            "Please specify a gem name on the command line (e.g. gem build GEMNAME)"
+    end
+
+    if args.size > 1 then
+      raise Gem::CommandLineError,
+            "Too many gem names (#{args.join(', ')}); please specify only one"
+    end
+
+    args.first
+  end
+
+  ##
+  # Get a single optional argument from the command line.  If more than one
+  # argument is given, return only the first. Return nil if none are given.
+
+  def get_one_optional_argument
+    args = options[:args] || []
+    args.first
+  end
+
+  ##
+  # Override to provide details of the arguments a command takes.  It should
+  # return a left-justified string, one argument per line.
+  #
+  # For example:
+  #
+  #   def usage
+  #     "#{program_name} FILE [FILE ...]"
+  #   end
+  #
+  #   def arguments
+  #     "FILE          name of file to find"
+  #   end
+
+  def arguments
+    ""
+  end
+
+  ##
+  # Override to display the default values of the command options. (similar to
+  # +arguments+, but displays the default values).
+  #
+  # For example:
+  #
+  #   def defaults_str
+  #     --no-gems-first --no-all
+  #   end
+
+  def defaults_str
+    ""
+  end
+
+  ##
+  # Override to display a longer description of what this command does.
+
+  def description
+    nil
+  end
+
+  ##
+  # Override to display the usage for an individual gem command.
+  #
+  # The text "[options]" is automatically appended to the usage text.
+
+  def usage
+    program_name
+  end
+
+  ##
+  # Display the help message for the command.
+
+  def show_help
+    parser.program_name = usage
+    say parser
+  end
+
+  ##
+  # Invoke the command with the given list of arguments.
+
+  def invoke(*args)
+    invoke_with_build_args args, nil
+  end
+
+  ##
+  # Invoke the command with the given list of normal arguments
+  # and additional build arguments.
+
+  def invoke_with_build_args(args, build_args)
+    handle_options args
+
+    options[:build_args] = build_args
+
+    if options[:help] then
+      show_help
+    elsif @when_invoked then
+      @when_invoked.call options
+    else
+      execute
+    end
+  end
+
+  ##
+  # Call the given block when invoked.
+  #
+  # Normal command invocations just executes the +execute+ method of the
+  # command.  Specifying an invocation block allows the test methods to
+  # override the normal action of a command to determine that it has been
+  # invoked correctly.
+
+  def when_invoked(&block)
+    @when_invoked = block
+  end
+
+  ##
+  # Add a command-line option and handler to the command.
+  #
+  # See OptionParser#make_switch for an explanation of +opts+.
+  #
+  # +handler+ will be called with two values, the value of the argument and
+  # the options hash.
+  #
+  # If the first argument of add_option is a Symbol, it's used to group
+  # options in output.  See `gem help list` for an example.
+
+  def add_option(*opts, &handler) # :yields: value, options
+    group_name = Symbol === opts.first ? opts.shift : :options
+
+    @option_groups[group_name] << [opts, handler]
+  end
+
+  ##
+  # Remove previously defined command-line argument +name+.
+
+  def remove_option(name)
+    @option_groups.each do |_, option_list|
+      option_list.reject! { |args, _| args.any? { |x| x =~ /^#{name}/ } }
+    end
+  end
+
+  ##
+  # Merge a set of command options with the set of default options (without
+  # modifying the default option hash).
+
+  def merge_options(new_options)
+    @options = @defaults.clone
+    new_options.each do |k,v| @options[k] = v end
+  end
+
+  ##
+  # True if the command handles the given argument list.
+
+  def handles?(args)
+    begin
+      parser.parse!(args.dup)
+      return true
+    rescue
+      return false
+    end
+  end
+
+  ##
+  # Handle the given list of arguments by parsing them and recording the
+  # results.
+
+  def handle_options(args)
+    args = add_extra_args(args)
+    @options = Marshal.load Marshal.dump @defaults # deep copy
+    parser.parse!(args)
+    @options[:args] = args
+  end
+
+  ##
+  # Adds extra args from ~/.gemrc
+
+  def add_extra_args(args)
+    result = []
+
+    s_extra = Gem::Command.specific_extra_args(@command)
+    extra = Gem::Command.extra_args + s_extra
+
+    until extra.empty? do
+      ex = []
+      ex << extra.shift
+      ex << extra.shift if extra.first.to_s =~ /^[^-]/
+      result << ex if handles?(ex)
+    end
+
+    result.flatten!
+    result.concat(args)
+    result
+  end
+
+  private
+
+  def add_parser_description # :nodoc:
+    return unless description
+
+    formatted = description.split("\n\n").map do |chunk|
+      wrap chunk, 80 - 4
+    end.join "\n"
+
+    @parser.separator nil
+    @parser.separator "  Description:"
+    formatted.split("\n").each do |line|
+      @parser.separator "    #{line.rstrip}"
+    end
+  end
+
+  def add_parser_options # :nodoc:
+    @parser.separator nil
+
+    regular_options = @option_groups.delete :options
+
+    configure_options "", regular_options
+
+    @option_groups.sort_by { |n,_| n.to_s }.each do |group_name, option_list|
+      @parser.separator nil
+      configure_options group_name, option_list
+    end
+  end
+
+  ##
+  # Adds a section with +title+ and +content+ to the parser help view.  Used
+  # for adding command arguments and default arguments.
+
+  def add_parser_run_info title, content
+    return if content.empty?
+
+    @parser.separator nil
+    @parser.separator "  #{title}:"
+    content.split(/\n/).each do |line|
+      @parser.separator "    #{line}"
+    end
+  end
+
+  def add_parser_summary # :nodoc:
+    return unless @summary
+
+    @parser.separator nil
+    @parser.separator "  Summary:"
+    wrap(@summary, 80 - 4).split("\n").each do |line|
+      @parser.separator "    #{line.strip}"
+    end
+  end
+
+  ##
+  # Create on demand parser.
+
+  def parser
+    create_option_parser if @parser.nil?
+    @parser
+  end
+
+  ##
+  # Creates an option parser and fills it in with the help info for the
+  # command.
+
+  def create_option_parser
+    @parser = OptionParser.new
+
+    add_parser_options
+
+    @parser.separator nil
+    configure_options "Common", Gem::Command.common_options
+
+    add_parser_run_info "Arguments", arguments
+    add_parser_summary
+    add_parser_description
+    add_parser_run_info "Defaults", defaults_str
+  end
+
+  def configure_options(header, option_list)
+    return if option_list.nil? or option_list.empty?
+
+    header = header.to_s.empty? ? '' : "#{header} "
+    @parser.separator "  #{header}Options:"
+
+    option_list.each do |args, handler|
+      args.select { |arg| arg =~ /^-/ }
+      @parser.on(*args) do |value|
+        handler.call(value, @options)
+      end
+    end
+
+    @parser.separator ''
+  end
+
+  ##
+  # Wraps +text+ to +width+
+
+  def wrap(text, width) # :doc:
+    text.gsub(/(.{1,#{width}})( +|$\n?)|(.{1,#{width}})/, "\\1\\3\n")
+  end
+
+  # ----------------------------------------------------------------
+  # Add the options common to all commands.
+
+  add_common_option('-h', '--help',
+                    'Get help on this command') do |value, options|
+    options[:help] = true
+  end
+
+  add_common_option('-V', '--[no-]verbose',
+                    'Set the verbose level of output') do |value, options|
+    # Set us to "really verbose" so the progress meter works
+    if Gem.configuration.verbose and value then
+      Gem.configuration.verbose = 1
+    else
+      Gem.configuration.verbose = value
+    end
+  end
+
+  add_common_option('-q', '--quiet', 'Silence commands') do |value, options|
+    Gem.configuration.verbose = false
+  end
+
+  # Backtrace and config-file are added so they show up in the help
+  # commands.  Both options are actually handled before the other
+  # options get parsed.
+
+  add_common_option('--config-file FILE',
+                    'Use this config file instead of default') do
+  end
+
+  add_common_option('--backtrace',
+                    'Show stack backtrace on errors') do
+  end
+
+  add_common_option('--debug',
+                    'Turn on Ruby debugging') do
+  end
+
+  # :stopdoc:
+
+  HELP = <<-HELP
+RubyGems is a sophisticated package manager for Ruby.  This is a
+basic help message containing pointers to more information.
+
+  Usage:
+    gem -h/--help
+    gem -v/--version
+    gem command [arguments...] [options...]
+
+  Examples:
+    gem install rake
+    gem list --local
+    gem build package.gemspec
+    gem help install
+
+  Further help:
+    gem help commands            list all 'gem' commands
+    gem help examples            show some examples of usage
+    gem help gem_dependencies    gem dependencies file guide
+    gem help platforms           gem platforms guide
+    gem help <COMMAND>           show help on COMMAND
+                                   (e.g. 'gem help install')
+    gem server                   present a web page at
+                                 http://localhost:8808/
+                                 with info about installed gems
+  Further information:
+    http://guides.rubygems.org
+  HELP
+
+  # :startdoc:
+
+end
+
+##
+# \Commands will be placed in this namespace
+
+module Gem::Commands
+end
+