#!/usr/bin/env bash

# __rvm_select implementation version patch_level
__rvm_select()
{
  # Set Variable Defaults
  export GEM_HOME GEM_PATH MY_RUBY_HOME RUBY_VERSION

  if [[ -z "${rvm_ruby_string:-""}" ]]
  then
    [[ -n "${rvm_ruby_interpreter:-""}" ]] && rvm_ruby_string="$rvm_ruby_interpreter"
    [[ -n "${rvm_ruby_version:-""}" ]]     && rvm_ruby_string="$rvm_ruby_string-$rvm_ruby_version"
    [[ -n "${rvm_ruby_patch_level:-""}" ]] && rvm_ruby_string="$rvm_ruby_string-$rvm_ruby_patch_level"
    [[ -n "${rvm_ruby_revision:-""}" ]]    && rvm_ruby_string="$rvm_ruby_string-$rvm_ruby_revision"
    [[ -n "${rvm_ruby_name:-""}" ]]        && rvm_ruby_name="$rvm_ruby_string-$rvm_ruby_name"
  fi

  __rvm_ruby_string || return $?

  rvm_archive_extension="tar.gz"

  [[ -n "${rvm_ruby_interpreter:-""}" ]] ||
    rvm_ruby_interpreter="${rvm_ruby_string//-*/}"

  case "$rvm_ruby_interpreter" in
    macruby)
      if [[ "Darwin" = "$(uname)" ]] ; then

        rvm_ruby_package_name="${rvm_ruby_interpreter}-${rvm_ruby_version}"

        if (( ${rvm_head_flag:=0} == 1 ))
        then
          rvm_ruby_version="" ; rvm_ruby_tag=""
          rvm_ruby_revision="head"
          __rvm_db "macruby_repo_url" "rvm_ruby_repo_url"
          rvm_ruby_url="$rvm_ruby_repo_url"

        elif [[ "nightly" = "${rvm_ruby_version:-""}" ]] ; then
          __rvm_db "macruby_nightly_url" "rvm_ruby_url"
          rvm_ruby_package_name="${rvm_ruby_interpreter}_nightly-${rvm_ruby_version}"
          rvm_ruby_package_file="$rvm_ruby_package_name"

        else
          __rvm_db "macruby_version" "rvm_ruby_version"
          __rvm_db "macruby_url" "rvm_ruby_url"
          rvm_ruby_package_name="MacRuby%20${rvm_ruby_version}.zip"
          rvm_ruby_package_file="$rvm_ruby_package_name"
          rvm_ruby_url="$rvm_ruby_url/$rvm_ruby_package_name"
        fi
        rvm_ruby_patch_level=""
      else
        rvm_error "MacRuby can only be installed on a Darwin OS."
      fi
    ;;

    rbx|rubinius)
      rvm_archive_extension="tar.gz"
      rvm_ruby_interpreter="rbx"
      rvm_ruby_version=${rvm_ruby_version:-$(__rvm_db "rbx_version")}
      rvm_ruby_repo_url=${rvm_rbx_repo_url:-$(__rvm_db "rubinius_repo_url")}

      if (( ${rvm_head_flag:=0} == 0 ))
      then
        rvm_ruby_patch_level=${rvm_ruby_patch_level:-$(__rvm_db "rbx_patch_level")}
        rvm_ruby_string="${rvm_ruby_string/-prc/-rc}"
        rvm_ruby_string="$(echo "$rvm_ruby_string" | \sed 's#-p*#-#')"
        rvm_ruby_package_file="$(echo "rubinius-${rvm_ruby_version}-${rvm_ruby_patch_level}.${rvm_archive_extension}" | \sed 's#-p*#-#' )"
        __rvm_db "rbx_url" "rvm_ruby_url"
        rvm_ruby_url="$rvm_ruby_url/$rvm_ruby_package_file"

        #export RBXOPT="${RBXOPT:=${rvm_rbx_opt:="-Xrbc.db=${rvm_rbx_home:="${GEM_HOME}"} -Xagent.start"}}"
        if [[ -n "${rvm_rbx_opt:-}" ]]
        then
          export RBXOPT="${RBXOPT:=${rvm_rbx_opt}}"
        else
          unset RBXOPT
        fi
      else
        rvm_ruby_patch_level="" ; rvm_ruby_version=""
      fi
    ;;

    jruby)
      rvm_ruby_patch_level=""

      if (( ${rvm_head_flag:=0} == 1 ))
      then
        rvm_ruby_version="head"
        rvm_ruby_repo_url="${rvm_ruby_repo_url:-$(__rvm_db "jruby_repo_url")}"
        rvm_ruby_url="${rvm_ruby_repo_url:-$(__rvm_db "jruby_repo_url")}"

      else
        rvm_archive_extension="tar.gz"
        rvm_ruby_version="${rvm_ruby_version:-"$(__rvm_db "jruby_version")"}"
        jruby_url="$(__rvm_db "jruby_url")"
        rvm_ruby_package_file="${rvm_ruby_interpreter}-bin-${rvm_ruby_version}"
        rvm_ruby_package_name="${rvm_ruby_interpreter}-${rvm_ruby_version}"
        rvm_ruby_url="${jruby_url}/${rvm_ruby_version}/${rvm_ruby_package_file}.tar.gz"
        jruby_url=""
      fi

      alias jruby_ng="jruby --ng"
      alias jruby_ng_server="jruby --ng-server"
    ;;

    maglev)
      rvm_ruby_patch_level=""
      maglev_url="$(__rvm_db "maglev_url")"

      if (( ${rvm_head_flag:=0} == 1 ))
      then
        rvm_ruby_version="head"
        rvm_ruby_repo_url="${rvm_ruby_repo_url:-$(__rvm_db "maglev_repo_url")}"
        rvm_ruby_url="${rvm_ruby_repo_url:-$(__rvm_db "maglev_repo_url")}"

      else
        system="$(uname -s)"
        arch="$(uname -m)"
        rvm_ruby_package_file="MagLev-${rvm_ruby_version}.${system}-${arch}"
        rvm_gemstone_package_file="GemStone-${rvm_ruby_version}.${system}-${arch}"
        rvm_ruby_version="${rvm_ruby_version:-"$(__rvm_db "maglev_version")"}"
        rvm_ruby_package_name="${rvm_ruby_interpreter}-${rvm_ruby_version}"
        rvm_ruby_url="${rvm_ruby_url:-"$maglev_url/${rvm_ruby_package_file}.${rvm_archive_extension}"}"
        rvm_gemstone_url="$maglev_url/${rvm_gemstone_package_file}.${rvm_archive_extension}"
        export MAGLEV_HOME="$rvm_rubies_path/$rvm_ruby_string"
      fi
    ;;

    ironruby)
      rvm_ruby_patch_level=""

      if (( ${rvm_head_flag:=0} == 1 ))
      then
        rvm_ruby_version="head"
        rvm_ruby_package_name="${rvm_ruby_string}"
        rvm_ruby_repo_url="${rvm_ruby_repo_url:-$(__rvm_db "ironruby_repo_url")}"
        rvm_ruby_url="${rvm_ruby_repo_url:-$(__rvm_db "ironruby_repo_url")}"

      else
        rvm_archive_extension="zip"
        rvm_ruby_version=${rvm_ruby_version:-"$(__rvm_db "ironruby_version")"}
        rvm_ruby_package_name="${rvm_ruby_interpreter}-${rvm_ruby_version}"
        rvm_ruby_package_file="${rvm_ruby_interpreter}-${rvm_ruby_version}.${rvm_archive_extension}"
        rvm_ruby_url="$(__rvm_db "ironruby_${rvm_ruby_version}_url")${rvm_ruby_package_file}"
      fi

      export rvm_ruby_version rvm_ruby_string rvm_ruby_package_name rvm_ruby_repo_url rvm_ruby_url rvm_archive_extension
    ;;

    ree)
      rvm_ruby_interpreter=ree
      rvm_ruby_version=${rvm_ruby_version:-"$(__rvm_db "ree_version")"}

      if [[ -n "${rvm_ruby_patch_level:-0}" ]] ; then
        rvm_ruby_patch_level="$(echo $rvm_ruby_patch_level | \sed 's#^p##')"
      fi

      if (( ${rvm_head_flag:=0} == 0 ))
      then
        if [[ -n "${rvm_ruby_revision:-""}" ]]
        then
          rvm_ruby_patch_level="" ; rvm_ruby_package_file=""
          rvm_ruby_package_name="ree-$rvm_ruby_version-$rvm_ruby_revision"

        else
          rvm_ruby_package_file="ruby-enterprise-$rvm_ruby_version-$rvm_ruby_patch_level"
          rvm_ruby_url="$(__rvm_db "${rvm_ruby_interpreter}_${rvm_ruby_version}_url")/$rvm_ruby_package_file.tar.gz"
        fi
      fi

      case "$rvm_ruby_version" in
        1.8.*)
          : # all good!
          ;;

        *)
          rvm_error "Unknown Ruby Enterprise Edition version: $rvm_ruby_version"
          ;;
      esac
    ;;

    kiji)
      rvm_ruby_interpreter="kiji"
      rvm_ruby_version="head"
      rvm_head_flag=1
      rvm_ruby_string="kiji-head"
      rvm_ruby_patch_level=""
      rvm_ruby_repo_url=${rvm_mput_repo_url:-"$(__rvm_db "kiji_repo_url")"}
      rvm_ruby_url=$rvm_ruby_repo_url
      rvm_ruby_configure="" ; rvm_ruby_make="" ; rvm_ruby_make_install=""
    ;;

    goruby)
      rvm_ruby_interpreter="goruby"
      rvm_ruby_version="head"
      rvm_ruby_string="goruby"
      rvm_ruby_patch_level=""
      rvm_ruby_repo_url=${rvm_mput_repo_url:-"$(__rvm_db "goruby_repo_url")"}
      rvm_ruby_url=$rvm_ruby_repo_url
      rvm_ruby_configure="" ; rvm_ruby_make="" ; rvm_ruby_make_install=""
    ;;

    ruby)
      rvm_ruby_package_file="${rvm_ruby_interpreter}-${rvm_ruby_version}-${rvm_ruby_patch_level}"
      rvm_ruby_package_name="${rvm_ruby_interpreter}-${rvm_ruby_version}-${rvm_ruby_patch_level}"

      if [[ -z "${rvm_ruby_version:-""}" ]] && (( ${rvm_head_flag:=0} == 0 ))
      then
        rvm_error "Ruby version was not specified!"
      else
        rvm_ruby_repo_url="${rvm_ruby_repo_url:-"$(__rvm_db "ruby_repo_url")"}"
        if (( ${rvm_head_flag:=0} == 0 ))
        then
          rvm_archive_extension="tar.bz2"
        fi
      fi
    ;;

    current)
      ruby_binary="$(command -v ruby)"

      if (( $? == 0)) && match "$ruby_binary" "*rvm*"
      then
        rvm_ruby_string="$(dirname "$ruby_binary" | xargs dirname | xargs basename)"
      else
        rvm_ruby_interpreter="system"
      fi
    ;;

    default|system|user)
      # no-op?
    ;;

    *)
      if [[ -n "${MY_RUBY_HOME:-""}" ]]
      then
        rvm_ruby_string=$(basename $MY_RUBY_HOME)
        __rvm_select
      else
        if [[ -z "${rvm_ruby_string:-""}" ]]
        then
          rvm_error "Ruby implementation '$rvm_ruby_interpreter' is not known."
          return 1
        fi
      fi
  esac

  __rvm_gemset_select || return $?

  if [[ -n "$rvm_ruby_interpreter" && "system" != "$rvm_ruby_interpreter" && "default" != "$rvm_ruby_interpreter" ]]
  then
    if [[ -n "$rvm_ruby_version" ]]
    then
      rvm_ruby_release_version="${rvm_ruby_version/.*/}"
      rvm_ruby_major_version=${rvm_ruby_version%.*} ; rvm_ruby_major_version=${rvm_ruby_major_version#*.}
      rvm_ruby_minor_version="${rvm_ruby_version//*.}"
    fi

    rvm_ruby_package_name="${rvm_ruby_package_name:-${rvm_ruby_string//-n*}}"
    rvm_ruby_home="$rvm_rubies_path/$rvm_ruby_string"
    rvm_ruby_binary="$rvm_ruby_home/bin/ruby"
    rvm_ruby_irbrc="$rvm_ruby_home/.irbrc"

    if [[ "maglev" = "$rvm_ruby_interpreter" ]]
    then
      export MAGLEV_HOME="$rvm_ruby_home"
      export GEMSTONE_GLOBAL_DIR=$MAGLEV_HOME
    fi

    rvm_ruby_gem_home="${rvm_gems_path:-"$rvm_path/gems"}/${rvm_ruby_string}"

    if [[ -n "$rvm_gemset_name" ]]
    then
      rvm_ruby_gem_home="${rvm_ruby_gem_home}${rvm_gemset_separator:-"@"}${rvm_gemset_name}"
      rvm_ruby_gem_path="${rvm_ruby_gem_home}:${rvm_gems_path:-"$rvm_path/gems"}/${rvm_ruby_string}${rvm_gemset_separator:-"@"}global"
    fi

    rvm_ruby_global_gems_path="${rvm_ruby_gem_home%%${rvm_gemset_separator:-"@"}*}${rvm_gemset_separator:-"@"}global"
    rvm_ruby_gem_path="${rvm_ruby_gem_home}:${rvm_ruby_global_gems_path}"

    rvm_ruby_selected_flag=1

    [[ -d "${rvm_log_path}/$rvm_ruby_string" ]] ||
      \mkdir -p "${rvm_log_path}/$rvm_ruby_string"

    export rvm_action rvm_alias_expanded rvm_archflags rvm_archive_extension rvm_bin_flag rvm_bin_path rvm_clang_flag rvm_configure_flags rvm_debug_flag rvm_default_flag rvm_delete_flag rvm_docs_type rvm_dump_environment_flag rvm_error_message rvm_expanding_aliases rvm_file_name rvm_gemdir_flag rvm_gemset_name rvm_gemstone_package_file rvm_gemstone_url rvm_head_flag rvm_hook rvm_install_arguments rvm_install_on_use_flag rvm_llvm_flag rvm_loaded_flag rvm_make_flags rvm_niceness rvm_nightly_flag rvm_only_path_flag rvm_parse_break rvm_patch_names rvm_patch_original_pwd rvm_pretty_print_flag rvm_prior_cc rvm_proxy rvm_quiet_flag rvm_ree_options rvm_reload_flag rvm_remove_flag rvm_ruby_alias rvm_ruby_aliases rvm_ruby_args rvm_ruby_binary rvm_ruby_bits rvm_ruby_configure rvm_ruby_file rvm_ruby_gem_home rvm_ruby_gem_path rvm_ruby_global_gems_path rvm_ruby_home rvm_ruby_interpreter rvm_ruby_irbrc rvm_ruby_load_path rvm_ruby_major_version rvm_ruby_make rvm_ruby_make_install rvm_ruby_minor_version rvm_ruby_mode rvm_ruby_name rvm_ruby_package_file rvm_ruby_package_name rvm_ruby_patch rvm_ruby_patch_level rvm_ruby_release_version rvm_ruby_repo_url rvm_ruby_require rvm_ruby_revision rvm_ruby_selected_flag rvm_ruby_sha rvm_ruby_string rvm_ruby_strings rvm_ruby_tag rvm_ruby_url rvm_ruby_user_tag rvm_ruby_version rvm_script_name rvm_sdk rvm_silent_flag rvm_sticky_flag rvm_system_flag rvm_token rvm_trace_flag rvm_use_flag rvm_user_flag rvm_verbose_flag rvm_wrapper_name

  else
    rvm_ruby_interpreter="${rvm_ruby_interpreter:-system}"
  fi
}

__rvm_use_system() {

  unset GEM_HOME GEM_PATH MY_RUBY_HOME RUBY_VERSION IRBRC

  new_path="$(__rvm_remove_rvm_from_path ; printf "$PATH"):${rvm_bin_path}"

  if [[ -s "$rvm_config_path/system" ]]
  then
    \grep "MY_RUBY_HOME='$rvm_rubies_path" "$rvm_config_path/system" > /dev/null

    if (( $? == 0 ))
    then
      # 'system' should *not* point to an rvm ruby.
      [[ -f "$rvm_config_path/system" ]] && \rm -f "$rvm_config_path/system"
    else
      source "$rvm_config_path/system"
    fi
  fi

  if (( ${rvm_default_flag:=0} == 1 ))
  then
    "$rvm_scripts_path/alias" delete default &> /dev/null

    \find "${rvm_bin_path}" -maxdepth 0 -name 'default_*' -delete
    \rm -f "$rvm_config_path/default"
    \rm -f "$rvm_environments_path/default"
    __rvm_rm_rf "$rvm_wrappers_path/default"
  fi

  # Check binaries, remove under the condition they're symlinks.
  if (( ${rvm_user_install_flag:=0} == 0 ))
  then
    for binary in ruby gem irb ri rdoc rake erb testrb
    do
      full_binary_path="${rvm_bin_path}/$binary"
      [[ -L "$full_binary_path" ]] && \rm -f "$full_binary_path"
    done
  fi

  if (( ${rvm_verbose_flag:=0} == 1 ))
  then
    rvm_log "Now using system ruby."
  fi

  __rvm_remove_rvm_from_path

  new_path="$PATH:${rvm_bin_path}"

  export rvm_ruby_string="system"

}

__rvm_use()
{
  local new_path binary full_binary_path rvm_ruby_gem_home

  #if [[ ${rvm_ruby_selected_flag:-0} -eq 0 ]] ; then __rvm_select "$@" ; fi
  __rvm_select "$@" || return $?

  [[ -n "${rvm_ruby_interpreter:-""}" ]] || rvm_ruby_interpreter="system"

  if [[ "system" = "$rvm_ruby_interpreter" ]]
  then
    __rvm_use_system
  else
    unset BUNDLE_PATH # Ensure that BUNDLE_PATH is not set!
    GEM_HOME="$rvm_ruby_gem_home"
    GEM_PATH="$rvm_ruby_gem_home:$rvm_ruby_global_gems_path"
    MY_RUBY_HOME="$rvm_ruby_home"
    RUBY_VERSION="$rvm_ruby_string"
    IRBRC="$rvm_ruby_irbrc"

    export GEM_HOME GEM_PATH MY_RUBY_HOME RUBY_VERSION IRBRC

    IRBRC=${IRBRC:-""} ; if [[ -z "$IRBRC" ]] ; then unset IRBRC ; fi

    if [[ ! -d "$MY_RUBY_HOME" ]]
    then
      rvm_warn "$rvm_ruby_interpreter $rvm_ruby_string is not installed."

      if [[ ${rvm_install_on_use_flag:-0} -eq 1 ]]
      then
        "$rvm_scripts_path/manage" "install" "$rvm_ruby_string"
      else
        rvm_log "To install do: 'rvm install $rvm_ruby_string'"
        return 1
      fi
    fi

    # Ensure the environment file for the selected ruby exists.
    __rvm_ensure_has_environment_files

    if (( ${rvm_verbose_flag:=0} == 1 ))
    then
      rvm_log "Using ${GEM_HOME/${rvm_gemset_separator:-'@'}/ with gemset }"
    fi

    new_path="$GEM_HOME/bin:$rvm_ruby_global_gems_path/bin:$MY_RUBY_HOME/bin:${rvm_bin_path}:$(__rvm_remove_rvm_from_path ; printf "$PATH")"
  fi

  # Export ruby string and gem set me for extrenal scripts to take advantage of them.
  [[ -z "${rvm_ruby_string:-""}" ]] || export rvm_ruby_string
  [[ -z "${rvm_gemset_name:-""}" ]] || export rvm_gemset_name

  if [[ -n "$new_path" ]]
  then
    export PATH="$new_path"
    unset new_path
    builtin hash -r
  fi

  if [[ "$rvm_ruby_string" != "system" ]]
  then
    if (( ${rvm_rvmrc_flag:=0} == 1 ))
    then
      __rvm_set_rvmrc
    fi

    local environment_id="$(__rvm_environment_identifier)"

    if (( ${rvm_default_flag:=0} == 1 )) && [[ "default" != "${rvm_ruby_interpreter:-""}" ]]
    then
      if (( ${rvm_user_install_flag:=0} == 0 ))
      then
        # Sets up the default wrappers.
        "$rvm_scripts_path/wrapper" "$rvm_ruby_string" --no-prefix
      else
        "$rvm_scripts_path/wrapper" "$rvm_ruby_string" "default"
      fi

      if [[ "system" != "$rvm_ruby_interpreter" ]]
      then
        RUBY_VERSION="$("$rvm_ruby_home/bin/ruby" -v | \sed 's#^\(.*\) (.*$#\1#')"

        export GEM_HOME GEM_PATH MY_RUBY_HOME RUBY_VERSION

        # Switch the default alias to the new environment id
        "$rvm_scripts_path/alias" delete default &> /dev/null
        "$rvm_scripts_path/alias" create default "$environment_id" >& /dev/null

        for _path in "$rvm_environments_path" "$rvm_wrappers_path"
        do
          # Remove old default if it exists.
          [[ -L "$_path/default" ]] && rm -f "$_path/default"
          # Symlink n the new default
          \ln -fs "$_path/$environment_id" "$_path/default"
        done

        # Copy wrapper scripts for the newly set default to the RVM bin path.
        for wrapper in "$rvm_path"/wrappers/default/*
        do
          [[ ! -L "$rvm_bin_path/${wrapper##*\/}" ]] ||
            rm -f "$rvm_bin_path/${wrapper##*\/}"

          cp -f "$wrapper" "$rvm_bin_path/${wrapper##*\/}"

          # If the RVM bin path is different from rvm_path/bin, ensure they are
          # in sync.
          if [[ "${rvm_bin_path}" != "${rvm_path}/bin" ]]
          then
            cp -f "${wrapper}" "${rvm_path}/bin/"
          fi
        done
      fi
    fi

    rvm_default_flag=0

    if [[ -n "${rvm_wrapper_name:-""}" ]] ; then
      "$rvm_scripts_path/wrapper" "$environment_id" "$rvm_wrapper_name" > /dev/null 2>&1
      rvm_wrapper_name=""
    fi

    if [[ -n "${rvm_ruby_alias:-""}" ]]; then
      rvm_log "Attempting to alias $environment_id to $rvm_ruby_alias"
      "$rvm_scripts_path/alias" delete "$rvm_ruby_alias" > /dev/null 2>&1
      rvm_alias_expanded=1 "$rvm_scripts_path/alias" create "$rvm_ruby_alias" "$environment_id" > /dev/null 2>&1
      ruby_alias="" ; rvm_ruby_alias=""
    fi

    if [[ "maglev" = "${rvm_ruby_interpreter:-""}" ]]
    then
      export MAGLEV_HOME="$rvm_ruby_home"
      export GEMSTONE_GLOBAL_DIR=$MAGLEV_HOME

      if [[ -x "$MAGLEV_HOME/gemstone/bin/gslist" ]]
      then
        "$MAGLEV_HOME/gemstone/bin/gslist" -clv > /dev/null 2>&1 ; result=$?
        if (( result == 1 ))
        then
         "$rvm_ruby_home/bin/maglev" start
       fi
      fi
    fi
  else
    if (( ${rvm_default_flag:=0} == 1 ))
    then
      command -v __rvm_reset >> /dev/null 2>&1 || \
        source "$rvm_scripts_path/functions/reset"
      __rvm_reset
    fi
  fi
  rvm_hook="after_use"
  source "$rvm_scripts_path/hook"
  return 0
}

__rvm_ruby_string()
{
  # rvm_ruby_string may designate any of the following items:
  # * rvm_gemset_name
  # * rvm_ruby_interpreter
  # * rvm_ruby_version
  # * rvm_ruby_patch_level
  # * rvm_ruby_revision
  # * rvm_ruby_tag

  local ruby_string gemset_name
  __rvm_default_flags

  rvm_expanding_aliases=${rvm_expanding_aliases:-0}

  rvm_ruby_version="${rvm_ruby_version:-}"
  rvm_gemset_name="${rvm_gemset_name:-}"
  rvm_ruby_interpreter="${rvm_ruby_interpreter:-}"
  rvm_ruby_version="${rvm_ruby_version:-}"
  rvm_ruby_patch_level="${rvm_ruby_patch_level:-}"
  rvm_ruby_revision="${rvm_ruby_revision:-}"
  rvm_ruby_tag="${rvm_ruby_tag:-}"

  if echo "$rvm_ruby_string" | \grep "${rvm_gemset_separator:-"@"}" >/dev/null 2>&1
  then
    rvm_gemset_name="${rvm_ruby_string/*${rvm_gemset_separator:-"@"}/}"
    rvm_ruby_string="${rvm_ruby_string/${rvm_gemset_separator:-"@"}*/}"
  fi

  # Alias'd rubies
  if (( rvm_expanding_aliases == 0 )) && [[ -n "${rvm_ruby_string:-}" && "$rvm_ruby_string" != "system" ]]
  then
    if expanded_alias_name="$("$rvm_scripts_path/alias" show "$rvm_ruby_string" 2>/dev/null)" \
      && [[ -n "$expanded_alias_name" ]]
    then
      rvm_ruby_string="$expanded_alias_name"
    elif [[ "$rvm_ruby_string" = default ]]
    then
      # Default is not a known value. Instead, we need to therefore set it to system.
      rvm_ruby_string="system"
    fi
  fi

  if echo "$rvm_ruby_string" | \grep "${rvm_gemset_separator:-"@"}" >/dev/null 2>&1 ; then
    rvm_gemset_name="${rvm_ruby_string/*${rvm_gemset_separator:-"@"}/}"
    rvm_ruby_string="${rvm_ruby_string/${rvm_gemset_separator:-"@"}*/}"
  fi

  # Stash the ruby string.
  ruby_string="${rvm_ruby_string:-}"
  gemset_name="${rvm_gemset_name:-}"
  repo_url="${rvm_ruby_repo_url:-}"
  branch_name="${rvm_ruby_repo_branch:-}"
  ruby_name="${rvm_ruby_name:-}"

  __rvm_unset_ruby_variables

  rvm_ruby_repo_url="${repo_url:-""}"
  rvm_ruby_repo_branch="${branch_name:-""}"
  rvm_ruby_name="$ruby_name"

  if [[ -n "$gemset_name" ]] ; then
    rvm_gemset_name="$gemset_name"
    rvm_sticky_flag=1 # <- not sold on this.
  fi

  strings=($(echo "${ruby_string//-/ }"))


  if (( ${#strings[@]} == 0 ))
  then
    if echo "${GEM_HOME:-""}" | grep "rvm" >/dev/null 2>&1
    then
      # Current Ruby
      strings="${GEM_HOME##*\/}"
      strings="${strings/%${rvm_gemset_separator:-"@"}*}"
      rvm_ruby_string="$strings"
      strings=(${strings//-/ })
    else
      strings=(system)
      rvm_ruby_string="system"
    fi
  fi

  for string in "${strings[@]:-""}"
  do
    case "$string" in
      head)
        rvm_ruby_revision="head"
        rvm_ruby_patch_level=""
        rvm_ruby_revision=""
        rvm_ruby_tag=""
        export rvm_head_flag=1
        ;;

      system)
        rvm_ruby_interpreter="system"
        rvm_ruby_patch_level=""
        rvm_ruby_tag=""
        rvm_ruby_revision=""
        rvm_ruby_version=""
        rvm_gemset_name=""
        rvm_head_flag=0
        return 0
        ;;

      nightly)
        rvm_ruby_version="nightly"
        rvm_nightly_flag=1
        break
        ;;

      preview*)
        rvm_ruby_patch_level="$string"
        ;;

      rc[[:digit:]]*)
        rvm_ruby_patch_level="$string"
        ;;

      [[:digit:]].[[:digit:]]*)
        case "$string" in
          (0.+([[:digit:]])|0.+([[:digit:]]).+([[:digit:]])|1.+([[:digit:]]).+([[:digit:]]))
            rvm_ruby_version="$string"
            rvm_ruby_revision=""
            rvm_ruby_tag=""
            ;;

          (*)
            rvm_error "Unknown ruby interpreter version: '$string'"
            return 1
            ;;
        esac
        ;;

      p[[:digit:]]*)
        rvm_ruby_patch_level="$string"
        ;;

      [[:digit:]][[:digit:]]*)

        case "${rvm_ruby_interpreter:-""}" in
          ree)
            rvm_ruby_patch_level="$string"
            rvm_ruby_revision=""
            ;;

          kiji)
            rvm_ruby_patch_level="$string"
            rvm_ruby_revision=""
            ;;

          rbx)
            rvm_ruby_patch_level="$string"
            ;;

          maglev)
            rvm_ruby_version="$string"
            rvm_ruby_revision=""
            rvm_ruby_patch_level=""
            ;;

          *)
            rvm_ruby_revision="r$string"
            ;;
        esac
        ;;

      r[[:digit:]]*)
        rvm_ruby_patch_level=""
        rvm_ruby_revision="$string"
        ;;

      s[[:digit:]]*)
        rvm_ruby_revision=""
        rvm_ruby_sha="$string"
        ;;

      tv[[:digit:]]* | t[[:digit:]]*)
        rvm_ruby_patch_level="" ; rvm_ruby_revision=""
        rvm_ruby_tag="$string"
        ;;

      m[[:digit:]]*)
        rvm_ruby_mode="$string"
      ;;

    u[[:alnum:]]*)
      rvm_ruby_patch_level="" ; rvm_ruby_revision="" ; rvm_ruby_tag="" ; rvm_ruby_patch=""
      rvm_ruby_user_tag="$string"
      ;;

    b[[:digit:]][[:digit:]]*)
      rvm_ruby_bits="$string"
      ;;

    ruby|rbx|jruby|macruby|ree|kiji|rubinius|maglev|ironruby|goruby)
      rvm_ruby_interpreter="$string"
      ;;

    [[:alpha:]]*([[:alnum:]]|_))
      rvm_ruby_name="$string"
      ;;

    *)
      rvm_error "Unknown ruby interpreter string component: '$string'"
      return 1
      ;;
    esac
  done

  if [[ -z "${rvm_ruby_interpreter:-""}" ]]
  then
    # Detect interpreter based on version.
    case "$rvm_ruby_version" in
      1.[8-9]*) rvm_ruby_interpreter="ruby"    ;;
      0.[5-6]*) rvm_ruby_interpreter="macruby" ;;
      1.[2-4]*) rvm_ruby_interpreter="rbx"     ;;
      1.[5-7]*) rvm_ruby_interpreter="jruby"   ;;
    esac
  fi

  # Unspecified version
  rvm_ruby_version="${rvm_ruby_version:-""}"
  if [[ -z "${rvm_ruby_version:-""}" ]] && (( ${rvm_head_flag:=0} == 0 ))
  then
    rvm_ruby_version="${rvm_ruby_version:-"$(__rvm_db "${rvm_ruby_interpreter}_version")"}"
  fi

  if [[ -z "${rvm_ruby_version:-""}" ]]
  then
    rvm_ruby_string="${rvm_ruby_interpreter}"
  else
    rvm_ruby_string="${rvm_ruby_interpreter}-${rvm_ruby_version}"
  fi

  # Head
  if (( ${rvm_head_flag:=0} == 1 ))
  then
    rvm_ruby_string="${rvm_ruby_string}-head"

  elif [[ -n "${rvm_ruby_revision:-""}" ]]
  then
    rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_revision}"

  elif [[ -n "${rvm_ruby_tag:-""}" ]]
  then
    rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_tag}"

  elif [[ -n "${rvm_ruby_patch_level:-""}" ]]
  then
    rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_patch_level}"

  elif [[ -n "${rvm_ruby_user_tag:-""}" ]]
  then
    rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_user_tag}"

  else
    patch_level="$(__rvm_db "${rvm_ruby_interpreter}_${rvm_ruby_version}_patch_level")"

    if [[ -n "${patch_level:-""}" ]]
    then
      case "$rvm_ruby_interpreter" in
        ree|kiji|rbx)
          # REE, Kiji & Rubinius use dates for their patch levels.
          rvm_ruby_patch_level="${patch_level}"
          ;;
        *)
          # MRI uses -pN+ to specify the patch level.
          rvm_ruby_patch_level="p${patch_level}"
          ;;
      esac

    fi

    if [[ -n "${rvm_ruby_patch_level:-""}" ]]
    then
      rvm_ruby_patch_level="${rvm_ruby_patch_level/#pp/p}"
      rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_patch_level}"

      case "$rvm_ruby_interpreter" in
        ree|kiji|rbx)
          rvm_ruby_string="${rvm_ruby_string//-p*/-}"
          ;;

        *)
          rvm_ruby_string="${rvm_ruby_string//-pp/-p}"
          rvm_ruby_string="${rvm_ruby_string//-prc/-rc}"
          ;;
      esac
    fi
  fi

  if [[ -n "${rvm_ruby_name:-}" ]]
  then
    rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_name}"
  fi
}

# Select a gemset based on CLI set options and environment.
# This only sets 'rvm_ruby_gem_home'
__rvm_gemset_select()
{
  command -v gem > /dev/null
  (( $? == 0 )) ||  return 0 # Stop if no 'gem' command is available.

  rvm_ruby_gem_home="${rvm_ruby_gem_home:-""}"
  rvm_gemset_name="${rvm_gemset_name:-""}"

  if [[ -z "${rvm_gemset_name:-""}" ]]
  then
    # No longer defaulting to 'sticky' gem sets.
    # Set 'rvm_sticky_flag=1' in ~/.rvmrc to enable.
    if [[ ${rvm_sticky_flag:-0} -eq 1 ]]
    then
      [[ -z "${GEM_HOME:-""}" ]] ||
        rvm_gemset_name="$(echo $GEM_HOME | xargs basename | awk -F${rvm_gemset_separator:-"@"} '{print $2}')"

      [[ -z "${rvm_ruby_gem_home:-""}" ]] ||
        rvm_gemset_name="$(echo $rvm_ruby_gem_home | xargs basename | awk -F${rvm_gemset_separator:-"@"} '{print $2}')"
    fi

    if [[ -n "${rvm_gemset_name:-""}" ]] &&
      ! echo "${rvm_gemset_name:-""}" | \grep "^[[:digit:]]\.[[:digit:]]" >/dev/null 2>&1
    then
      rvm_ruby_gem_home="${rvm_gems_path:-"$rvm_path/gems"}/${rvm_ruby_string}${rvm_gemset_separator:-"@"}${rvm_gemset_name}"
    else
      if [[ -n "${rvm_ruby_string:-""}" && "${rvm_ruby_interpreter:-""}" != "system" ]]
      then
        rvm_ruby_gem_home="${rvm_gems_path:-"$rvm_path/gems"}/$rvm_ruby_string"

      elif [[ -z "${GEM_HOME:-""}" && -n "$(command -v gem)" ]]
      then
        rvm_ruby_gem_home="$(gem env gemdir)"

      elif [[ -n "${GEM_HOME:-""}" ]]
      then
        rvm_ruby_gem_home="$GEM_HOME"

      else
        rvm_ruby_gem_home=""
      fi
    fi
  else
    local gemset="$(echo "$rvm_ruby_gem_home" | awk -F'@' '{print $NF}')"

    if [[ -z "${rvm_ruby_string:-""}" && -n "${GEM_HOME:-""}" && -n "${GEM_HOME/@*/}" ]]
    then
      rvm_ruby_string="$(basename ${GEM_HOME/@*/})"
    fi

    if [[ -n "${rvm_ruby_string:-""}" ]]
    then
      if [[ -z "${rvm_ruby_gem_home:-""}" || -n "${gemset:-""}" ]]
      then
        rvm_ruby_gem_home="${rvm_gems_path:-"$rvm_path/gems"}/${rvm_ruby_string}${rvm_gemset_separator:-"@"}${rvm_gemset_name}"
      elif [[ -n "${gemset:-""}" && "${rvm_gemset_name:-""}" != "${gemset:-""}" ]]
      then
        rvm_ruby_gem_home="${rvm_gems_path:-"$rvm_path/gems"}/${rvm_ruby_string}${rvm_gemset_separator:-"@"}${rvm_gemset_name}"
      fi
    else
      rvm_error "Gemsets can not be used with non rvm controlled rubies (currently)."
      return 1
    fi
  fi

  if [[ -z "${GEM_HOME:-""}" ]] ; then unset GEM_HOME ; fi

  # If the gemset does not exist, then notify the user as such and abort the action.
  if [[ -n "${rvm_gemset_name:-""}" && ! -d "$rvm_ruby_gem_home" ]] ; then

    if [[ ${rvm_gemset_create_on_use_flag:-0} -ne 1 && ${rvm_create_flag:-0} -ne 1 && ${rvm_delete_flag:-0} -ne 1 ]] ; then

      rvm_error "Gemset '$rvm_gemset_name' does not exist, rvm gemset create '$rvm_gemset_name' first."

      unset rvm_gemset_name gemset_name

      return 1
    fi

  elif (( ${rvm_delete_flag:=0} == 1 ))
  then
    return 1
  fi

  if [[ -z "${rvm_ruby_gem_home:-""}" && -n "${rvm_ruby_string:-""}" ]] ; then
    rvm_ruby_gem_home="${rvm_gems_path:-"$rvm_path/gems"}/$rvm_ruby_string"
  fi

  rvm_ruby_global_gems_path="${rvm_ruby_gem_home%%${rvm_gemset_separator:-"@"}*}${rvm_gemset_separator:-"@"}global"
  rvm_ruby_gem_path="$rvm_ruby_gem_home:$rvm_ruby_global_gems_path"

  # Ensure that the ruby gem home exists.
  \mkdir -p "$rvm_ruby_gem_home"

  if [[ -n "${rvm_ruby_gem_home:-""}" ]] &&
    echo "$rvm_ruby_gem_home" | \grep 'rvm' >/dev/null 2>&1
  then
    if __rvm_using_gemset_globalcache && [[ ! -L "$rvm_ruby_gem_home/cache" ]]
    then
      \mv "$rvm_ruby_gem_home/cache/"*.gem "$rvm_gems_cache_path/" 2>/dev/null

      __rvm_rm_rf "$rvm_ruby_gem_home/cache"

      \ln -fs "$rvm_gems_cache_path" "$rvm_ruby_gem_home/cache"
    fi
  fi
  export rvm_ruby_gem_path rvm_ruby_gem_home
}

# Use a gemset specified by 'rvm_ruby_gem_home'
__rvm_gemset_use()
{
  if [[ -z "${rvm_gemset_name:-""}" ]]
  then
    rvm_error "Gemset was not given.\n  Usage:\n    rvm gemset use <gemsetname>\n"
    return 1
  fi

  if [[ -n "${rvm_ruby_gem_home:-""}" ]]
  then
    if [[ ! -d "$rvm_ruby_gem_home" ]]
    then
      if (( ${rvm_gemset_create_on_use_flag:=0} == 1 )) || (( ${rvm_create_flag:=0} == 1 ))
      then
        "$rvm_scripts_path/gemsets" create "$rvm_gemset_name"
      else
        rvm_error "Gemset '$rvm_gemset_name' does not exist, rvm gemset create '$rvm_gemset_name' first."
        return 1
      fi
    fi

    if [[ -t 0 ]] && (( ${rvm_verbose_flag:=0} == 1 ))
    then
      rvm_log "Now using gemset '${rvm_gemset_name:-default}'"
    fi

    rvm_ruby_gem_home="${GEM_HOME//${rvm_gemset_separator:-"@"}*}${rvm_gemset_separator:-"@"}${rvm_gemset_name}"

    rvm_ruby_global_gems_path="${rvm_ruby_gem_home%%${rvm_gemset_separator:-"@"}*}${rvm_gemset_separator:-"@"}global"

    GEM_HOME="$rvm_ruby_gem_home"
    GEM_PATH="$rvm_ruby_gem_home:$rvm_ruby_global_gems_path"

    export rvm_ruby_gem_home GEM_HOME GEM_PATH

    __rvm_use # Now ensure the selection takes effect for the environment.
  fi

  return 0
}

__rvm_gemset_clear()
{
  rvm_gemset_name=""

  rvm_ruby_gem_home="${GEM_HOME//${rvm_gemset_separator:-"@"}*}"

  rvm_ruby_global_gems_path="${rvm_ruby_gem_home}${rvm_gemset_separator:-"@"}global"

  GEM_HOME="$rvm_ruby_gem_home"

  GEM_PATH="$rvm_ruby_gem_home:$rvm_ruby_global_gems_path"

  export rvm_ruby_gem_home rvm_ruby_global_gems_path GEM_HOME GEM_PATH

  __rvm_use # Now ensure the selection takes effect for the environment.
}

