Class: Gem::Commands::UninstallCommand

# File 'lib/rubygems/commands/uninstall_command.rb', line 116

def check_version # :nodoc:
  if options[:version] != Gem::Requirement.default &&
     get_all_gem_names.size > 1
    alert_error "Can't use --version with multiple gems. You can specify multiple gems with" \
                " version requirements using `gem uninstall 'my_gem:1.0.0' 'my_other_gem:~>2.0.0'`"
    terminate_interaction 1
  end
end

# File 'lib/rubygems/commands/uninstall_command.rb', line 97

def defaults_str # :nodoc:
  "--version '#{Gem::Requirement.default}' --no-force " \
    "--user-install"
end

# File 'lib/rubygems/commands/uninstall_command.rb', line 102

def description # :nodoc:
  <<-EOF
The uninstall command removes a previously installed gem.

RubyGems will ask for confirmation if you are attempting to uninstall a gem
that is a dependency of an existing gem.  You can use the
--ignore-dependencies option to skip this check.
  EOF
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

# File 'lib/rubygems/commands/uninstall_command.rb', line 112

def usage # :nodoc:
  "#{program_name} GEMNAME [GEMNAME ...]"
end