class Gem::Commands::InstallCommand

def arguments # :nodoc:
  "GEMNAME       name of gem to install"
end

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 install 'my_gem:1.0.0' 'my_other_gem:~>2.0.0'`"
    terminate_interaction 1
  end
end

def defaults_str # :nodoc:
  "--both --version '#{Gem::Requirement.default}' --no-force\n" \
    "--install-dir #{Gem.dir} --lock\n" +
    install_update_defaults_str
end

def description # :nodoc:
  <<-EOF
e install command installs local or remote gem into a gem repository.
r gems with executables ruby installs a wrapper file into the executable
rectory by default.  This can be overridden with the --no-wrappers option.
e wrapper allows you to choose among alternate gem versions using _version_.
r example `rake _0.7.3_ --version` will run rake version 0.7.3 if a newer
rsion is also installed.
m Dependency Files
==================
byGems can install a consistent set of gems across multiple environments
ing `gem install -g` when a gem dependencies file (gem.deps.rb, Gemfile or
olate) is present.  If no explicit file is given RubyGems attempts to find
e in the current directory.
en the RUBYGEMS_GEMDEPS environment variable is set to a gem dependencies
le the gems from that file will be activated at startup time.  Set it to a
ecific filename or to "-" to have RubyGems automatically discover the gem
pendencies file by walking up from the current directory.
TE: Enabling automatic discovery on multiuser systems can lead to
ecution of arbitrary code when used from directories outside your control.
tension Install Failures
========================
 an extension fails to compile during gem installation the gem
ecification is not written out, but the gem remains unpacked in the
pository.  You may need to specify the path to the library's headers and
braries to continue.  You can do this by adding a -- between RubyGems'
tions and the extension's build options:
$ gem install some_extension_gem
[build fails]
Gem files will remain installed in \\
/path/to/gems/some_extension_gem-1.0 for inspection.
Results logged to /path/to/gems/some_extension_gem-1.0/gem_make.out
$ gem install some_extension_gem -- --with-extension-lib=/path/to/lib
[build succeeds]
$ gem list some_extension_gem
*** LOCAL GEMS ***
some_extension_gem (1.0)
$
 you correct the compilation errors by editing the gem files you will need
 write the specification by hand.  For example:
$ gem install some_extension_gem
[build fails]
Gem files will remain installed in \\
/path/to/gems/some_extension_gem-1.0 for inspection.
Results logged to /path/to/gems/some_extension_gem-1.0/gem_make.out
$ [cd /path/to/gems/some_extension_gem-1.0]
$ [edit files or what-have-you and run make]
$ gem spec ../../cache/some_extension_gem-1.0.gem --ruby > \\
           ../../specifications/some_extension_gem-1.0.gemspec
$ gem list some_extension_gem
*** LOCAL GEMS ***
some_extension_gem (1.0)
$
mmand Alias
========================
u can use `i` command instead of `install`.
$ gem i GEMNAME
  EOF
end

def execute
  if options.include? :gemdeps
    install_from_gemdeps
    return # not reached
  end
  @installed_specs = []
  ENV.delete "GEM_PATH" if options[:install_dir].nil?
  check_version
  load_hooks
  exit_code = install_gems
  show_installed
  say update_suggestion if eligible_for_update?
  terminate_interaction exit_code
end

def initialize
  defaults = Gem::DependencyInstaller::DEFAULT_OPTIONS.merge({
    format_executable: false,
    lock: true,
    suggest_alternate: true,
    version: Gem::Requirement.default,
    without_groups: [],
  })
  defaults.merge!(install_update_options)
  super "install", "Install a gem into the local repository", defaults
  add_install_update_options
  add_local_remote_options
  add_platform_option
  add_version_option
  add_prerelease_option "to be installed. (Only for listed gems)"
  @installed_specs = []
end

def install_from_gemdeps # :nodoc:
  require_relative "../request_set"
  rs = Gem::RequestSet.new
  specs = rs.install_from_gemdeps options do |req, inst|
    s = req.full_spec
    if inst
      say "Installing #{s.name} (#{s.version})"
    else
      say "Using #{s.name} (#{s.version})"
    end
  end
  @installed_specs = specs
  terminate_interaction
end

def install_gem(name, version) # :nodoc:
  return if options[:conservative] &&
            !Gem::Dependency.new(name, version).matching_specs.empty?
  req = Gem::Requirement.create(version)
  dinst = Gem::DependencyInstaller.new options
  request_set = dinst.resolve_dependencies name, req
  if options[:explain]
    say "Gems to install:"
    request_set.sorted_requests.each do |activation_request|
      say "  #{activation_request.full_name}"
    end
  else
    @installed_specs.concat request_set.install options
  end
  show_install_errors dinst.errors
end

def install_gems # :nodoc:
  exit_code = 0
  get_all_gem_names_and_versions.each do |gem_name, gem_version|
    gem_version ||= options[:version]
    domain = options[:domain]
    domain = :local unless options[:suggest_alternate]
    suppress_suggestions = (domain == :local)
    begin
      install_gem gem_name, gem_version
    rescue Gem::InstallError => e
      alert_error "Error installing #{gem_name}:\n\t#{e.message}"
      exit_code |= 1
    rescue Gem::UnsatisfiableDependencyError => e
      show_lookup_failure e.name, e.version, e.errors, suppress_suggestions,
                          "'#{gem_name}' (#{gem_version})"
      exit_code |= 2
    end
  end
  exit_code
end

def load_hooks # :nodoc:
  if options[:install_as_default]
    require_relative "../install_default_message"
  else
    require_relative "../install_message"
  end
  require_relative "../rdoc"
end

def show_install_errors(errors) # :nodoc:
  return unless errors
  errors.each do |x|
    next unless Gem::SourceFetchProblem === x
    require_relative "../uri"
    msg = "Unable to pull data from '#{Gem::Uri.redact(x.source.uri)}': #{x.error.message}"
    alert_warning msg
  end
end

def show_installed # :nodoc:
  return if @installed_specs.empty?
  gems = @installed_specs.length == 1 ? "gem" : "gems"
  say "#{@installed_specs.length} #{gems} installed"
end

def usage # :nodoc:
  "#{program_name} [options] GEMNAME [GEMNAME ...] -- --build-flags"
end