class Gem::Commands::UninstallCommand

# File lib/rubygems/commands/uninstall_command.rb, line 16
def initialize
  super "uninstall", "Uninstall gems from the local repository",
        version: Gem::Requirement.default, user_install: true,
        check_dev: false, vendor: false

  add_option("-a", "--[no-]all",
    "Uninstall all matching versions") do |value, options|
    options[:all] = value
  end

  add_option("-I", "--[no-]ignore-dependencies",
             "Ignore dependency requirements while",
             "uninstalling") do |value, options|
    options[:ignore] = value
  end

  add_option("-D", "--[no-]check-development",
             "Check development dependencies while uninstalling",
             "(default: false)") do |value, options|
    options[:check_dev] = value
  end

  add_option("-x", "--[no-]executables",
               "Uninstall applicable executables without",
               "confirmation") do |value, options|
    options[:executables] = value
  end

  add_option("-i", "--install-dir DIR",
             "Directory to uninstall gem from") do |value, options|
    options[:install_dir] = File.expand_path(value)
  end

  add_option("-n", "--bindir DIR",
             "Directory to remove executables from") do |value, options|
    options[:bin_dir] = File.expand_path(value)
  end

  add_option("--[no-]user-install",
             "Uninstall from user's home directory",
             "in addition to GEM_HOME.") do |value, options|
    options[:user_install] = value
  end

  add_option("--[no-]format-executable",
             "Assume executable names match Ruby's prefix and suffix.") do |value, options|
    options[:format_executable] = value
  end

  add_option("--[no-]force",
             "Uninstall all versions of the named gems",
             "ignoring dependencies") do |value, options|
    options[:force] = value
  end

  add_option("--[no-]abort-on-dependent",
             "Prevent uninstalling gems that are",
             "depended on by other gems.") do |value, options|
    options[:abort_on_dependent] = value
  end

  add_version_option
  add_platform_option

  add_option("--vendor",
             "Uninstall gem from the vendor directory.",
             "Only for use by gem repackagers.") do |_value, options|
    unless Gem.vendor_dir
      raise Gem::OptionParser::InvalidOption.new "your platform is not supported"
    end

    alert_warning "Use your OS package manager to uninstall vendor gems"
    options[:vendor] = true
    options[:install_dir] = Gem.vendor_dir
  end
end

# File lib/rubygems/commands/uninstall_command.rb, line 125
def execute
  check_version

  # Consider only gem specifications installed at `--install-dir`
  Gem::Specification.dirs = options[:install_dir] if options[:install_dir]

  if options[:all] && !options[:args].empty?
    uninstall_specific
  elsif options[:all]
    uninstall_all
  else
    uninstall_specific
  end
end

# File lib/rubygems/commands/uninstall_command.rb, line 201
def uninstall(gem_name)
  Gem::Uninstaller.new(gem_name, options).uninstall
end

# File lib/rubygems/commands/uninstall_command.rb, line 140
def uninstall_all
  specs = Gem::Specification.reject(&:default_gem?)

  specs.each do |spec|
    options[:version] = spec.version
    uninstall_gem spec.name
  end

  alert "Uninstalled all gems in #{options[:install_dir] || Gem.dir}"
end

# File lib/rubygems/commands/uninstall_command.rb, line 187
def uninstall_gem(gem_name)
  uninstall(gem_name)
rescue Gem::GemNotInHomeException => e
  spec = e.spec
  alert("In order to remove #{spec.name}, please execute:\n" \
        "\tgem uninstall #{spec.name} --install-dir=#{spec.base_dir}")
rescue Gem::UninstallError => e
  spec = e.spec
  alert_error("Error: unable to successfully uninstall '#{spec.name}' which is " \
        "located at '#{spec.full_gem_path}'. This is most likely because" \
        "the current user does not have the appropriate permissions")
  terminate_interaction 1
end

# File lib/rubygems/commands/uninstall_command.rb, line 151
def uninstall_specific
  deplist = Gem::DependencyList.new
  original_gem_version = {}

  get_all_gem_names_and_versions.each do |name, version|
    original_gem_version[name] = version || options[:version]

    gem_specs = Gem::Specification.find_all_by_name(name, original_gem_version[name])

    if gem_specs.empty?
      say("Gem '#{name}' is not installed")
    else
      gem_specs.reject!(&:default_gem?) if gem_specs.size > 1

      gem_specs.each do |spec|
        deplist.add spec
      end
    end
  end

  deps = deplist.strongly_connected_components.flatten.reverse

  gems_to_uninstall = {}

  deps.each do |dep|
    if original_gem_version[dep.name] == Gem::Requirement.default
      next if gems_to_uninstall[dep.name]
      gems_to_uninstall[dep.name] = true
    else
      options[:version] = dep.version
    end

    uninstall_gem(dep.name)
  end
end