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Edit File: command_manager.rb

# frozen_string_literal: true
#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++

require_relative 'command'
require_relative 'user_interaction'
require_relative 'text'

##
# The command manager registers and installs all the individual sub-commands
# supported by the gem command.
#
# Extra commands can be provided by writing a rubygems_plugin.rb
# file in an installed gem.  You should register your command against the
# Gem::CommandManager instance, like this:
#
#   # file rubygems_plugin.rb
#   require 'rubygems/command_manager'
#
#   Gem::CommandManager.instance.register_command :edit
#
# You should put the implementation of your command in rubygems/commands.
#
#   # file rubygems/commands/edit_command.rb
#   class Gem::Commands::EditCommand < Gem::Command
#     # ...
#   end
#
# See Gem::Command for instructions on writing gem commands.

class Gem::CommandManager
  include Gem::Text
  include Gem::UserInteraction

BUILTIN_COMMANDS = [ # :nodoc:
    :build,
    :cert,
    :check,
    :cleanup,
    :contents,
    :dependency,
    :environment,
    :fetch,
    :generate_index,
    :help,
    :info,
    :install,
    :list,
    :lock,
    :mirror,
    :open,
    :outdated,
    :owner,
    :pristine,
    :push,
    :query,
    :rdoc,
    :search,
    :server,
    :signin,
    :signout,
    :sources,
    :specification,
    :stale,
    :uninstall,
    :unpack,
    :update,
    :which,
    :yank,
  ].freeze

ALIAS_COMMANDS = {
    'i'      => 'install',
    'login'  => 'signin',
    'logout' => 'signout',
  }.freeze

##
  # Return the authoritative instance of the command manager.

def self.instance
    @command_manager ||= new
  end

##
  # Returns self. Allows a CommandManager instance to stand
  # in for the class itself.

def instance
    self
  end

##
  # Reset the authoritative instance of the command manager.

def self.reset
    @command_manager = nil
  end

##
  # Register all the subcommands supported by the gem command.

def initialize
    require 'timeout'
    @commands = {}

BUILTIN_COMMANDS.each do |name|
      register_command name
    end
  end

##
  # Register the Symbol +command+ as a gem command.

def register_command(command, obj=false)
    @commands[command] = obj
  end

##
  # Unregister the Symbol +command+ as a gem command.

def unregister_command(command)
    @commands.delete command
  end

##
  # Returns a Command instance for +command_name+

def [](command_name)
    command_name = command_name.intern
    return nil if @commands[command_name].nil?
    @commands[command_name] ||= load_and_instantiate(command_name)
  end

##
  # Return a sorted list of all command names as strings.

def command_names
    @commands.keys.collect {|key| key.to_s }.sort
  end

##
  # Run the command specified by +args+.

def run(args, build_args=nil)
    process_args(args, build_args)
  rescue StandardError, Timeout::Error => ex
    alert_error clean_text("While executing gem ... (#{ex.class})\n    #{ex}")
    ui.backtrace ex

terminate_interaction(1)
  rescue Interrupt
    alert_error clean_text("Interrupted")
    terminate_interaction(1)
  end

def process_args(args, build_args=nil)
    if args.empty?
      say Gem::Command::HELP
      terminate_interaction 1
    end

case args.first
    when '-h', '--help' then
      say Gem::Command::HELP
      terminate_interaction 0
    when '-v', '--version' then
      say Gem::VERSION
      terminate_interaction 0
    when /^-/ then
      alert_error clean_text("Invalid option: #{args.first}. See 'gem --help'.")
      terminate_interaction 1
    else
      cmd_name = args.shift.downcase
      cmd = find_command cmd_name
      cmd.deprecation_warning if cmd.deprecated?
      cmd.invoke_with_build_args args, build_args
    end
  end

def find_command(cmd_name)
    cmd_name = find_alias_command cmd_name

possibilities = find_command_possibilities cmd_name

if possibilities.size > 1
      raise Gem::CommandLineError,
            "Ambiguous command #{cmd_name} matches [#{possibilities.join(', ')}]"
    elsif possibilities.empty?
      raise Gem::CommandLineError, "Unknown command #{cmd_name}"
    end

self[possibilities.first]
  end

def find_alias_command(cmd_name)
    alias_name = ALIAS_COMMANDS[cmd_name]
    alias_name ? alias_name : cmd_name
  end

def find_command_possibilities(cmd_name)
    len = cmd_name.length

found = command_names.select {|name| cmd_name == name[0, len] }

exact = found.find {|name| name == cmd_name }

exact ? [exact] : found
  end

private

def load_and_instantiate(command_name)
    command_name = command_name.to_s
    const_name = command_name.capitalize.gsub(/_(.)/) { $1.upcase } << "Command"
    load_error = nil

begin
      begin
        require "rubygems/commands/#{command_name}_command"
      rescue LoadError => e
        load_error = e
      end
      Gem::Commands.const_get(const_name).new
    rescue Exception => e
      e = load_error if load_error

alert_error clean_text("Loading command: #{command_name} (#{e.class})\n\t#{e}")
      ui.backtrace e
    end
  end
end