#!/usr/bin/env bash

# __rvm_select implementation version patch_level
__rvm_select() {
  if [[ -z "$rvm_ruby_string" ]] ; then
    rvm_ruby_string="${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="$rvm_ruby_string-n$rvm_ruby_name"
  fi

  __rvm_ruby_string

  rvm_archive_extension="tar.gz"

  case "$rvm_ruby_interpreter" in
    macruby)
      if [[ "Darwin" = "$(uname)" ]] ; then
        rvm_ruby_package_name=${rvm_ruby_interpreter}-${rvm_ruby_version}
        if [[ "$rvm_head_flag" -eq 1 ]] ; then
          unset rvm_ruby_version rvm_ruby_tag
          rvm_ruby_revision="head"
          __rvm_db "macruby_repo_url" "rvm_ruby_repo_url"
          rvm_url="$rvm_ruby_repo_url"
        elif [[ "nightly" = "$rvm_ruby_version" ]] ; then
          __rvm_db "macruby_nightly_url" "rvm_url"
          rvm_ruby_package_name="${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_url"
          rvm_ruby_package_name="MacRuby%20${rvm_ruby_version}.zip"
          rvm_ruby_package_file="$rvm_ruby_package_name"
          rvm_url="$rvm_url/$rvm_ruby_package_name"
        fi

        unset rvm_ruby_patch_level
      else
        "$rvm_scripts_path/log" "fail" "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 [[ -z "$rvm_head_flag" ]] ; then
        rvm_ruby_patch_level=${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_url"
        rvm_url="$rvm_url/$rvm_ruby_package_file"
      else
        unset rvm_ruby_patch_level rvm_ruby_version
      fi
    ;;

    jruby)
      unset rvm_ruby_patch_level
      if [[ ! -z "$rvm_head_flag" ]] ; then
        rvm_ruby_version="head"
        rvm_ruby_repo_url="${rvm_ruby_repo_url:-$(__rvm_db "jruby_repo_url")}"
        rvm_url="${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_url="${jruby_url}/${rvm_ruby_version}/${rvm_ruby_package_file}.tar.gz"
        unset jruby_url
      fi
      alias jruby_ng="jruby --ng"
      alias jruby_ng_server="jruby --ng-server"
    ;;

    maglev)
      unset rvm_ruby_patch_level
      maglev_url="$(__rvm_db "maglev_url")"
      if [[ ! -z "$rvm_head_flag" ]] ; then
        rvm_ruby_version="head"
        rvm_ruby_repo_url="${rvm_ruby_repo_url:-$(__rvm_db "maglev_repo_url")}"
        rvm_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_url="${rvm_ruby_url:-"$maglev_url/${rvm_ruby_package_file}.${rvm_archive_extension}"}"
        rvm_gemstone_url="${rvm_gemstone_url:-"$maglev_url/${rvm_gemstone_package_file}.${rvm_archive_extension}"}"
        export MAGLEV_HOME="$rvm_rubies_path/$rvm_ruby_string"
      fi
    ;;

    ironruby)
      unset rvm_ruby_patch_level
      if [[ "$rvm_head_flag" -eq 1 ]] ; then
        rvm_ruby_version="head"
        rvm_ruby_package_name="${rvm_ruby_string}"
        rvm_ruby_repo_url="${rvm_ruby_repo_url:-$(__rvm_db "ironruby_repo_url")}"
        rvm_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}.${rvm_archive_extension}"
        rvm_url="$(__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_url rvm_archive_extension
    ;;

    ree)
      rvm_ruby_interpreter=ree
      rvm_ruby_version=${rvm_ruby_version:-"$(__rvm_db "ree_version")"}
      if [[ ! -z "$rvm_ruby_patch_level" ]] ; then
        rvm_ruby_patch_level="$(echo $rvm_ruby_patch_level | sed 's#^p##')"
      fi

      if [[ "$rvm_ruby_version" != "head" ]]  ; then
        if [[ ! -z "$rvm_ruby_revision" ]] ; then
          unset 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_url="$(__rvm_db "${rvm_ruby_interpreter}_${rvm_ruby_version}_url")/$rvm_ruby_package_file.tar.gz"
        fi
      fi

      if ! "$rvm_scripts_path/match" "$rvm_ruby_version" "^1\.8" ; then
        "$rvm_scripts_path/log" "fail" "Unknown Ruby Enterprise Edition version: $rvm_ruby_version"
      fi
    ;;

    mput|shyouhei)
      rvm_ruby_interpreter="mput"
      rvm_ruby_version="head"
      rvm_ruby_string=$(echo $rvm_ruby_string | sed -e 's/shyouhei/mput/g')
      unset rvm_ruby_patch_level
      rvm_ruby_repo_url=${rvm_mput_repo_url:-"$(__rvm_db "shyouhei_repo_url")"}
      rvm_url=$rvm_ruby_repo_url
      unset rvm_ruby_configure rvm_ruby_make rvm_ruby_make_install
    ;;

    ruby)
      if [[ -z "$rvm_ruby_version" && -z "$rvm_head_flag" ]]; then
        "$rvm_scripts_path/log" "fail" "Unknown ruby version: $rvm_ruby_version"
      else
        rvm_ruby_repo_url="${rvm_ruby_repo_url:-"$(__rvm_db "ruby_repo_url")"}"
        if [[ -z "$rvm_head_flag" ]]; then
          rvm_archive_extension="tar.bz2"
        fi
      fi
    ;;

    current)
      ruby_binary="$(command -v ruby)"
      if [[ $? -eq 0 ]] && "$rvm_scripts_path/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 [[ ! -z "$MY_RUBY_HOME" ]] ; then
        rvm_ruby_string=$(basename $MY_RUBY_HOME)
        __rvm_select
      else
        if [[ -z "$rvm_ruby_string" ]] ; then
          "$rvm_scripts_path/log" "fail" "Ruby implementation '$rvm_ruby_interpreter' is not known."
          return 1
        fi
      fi
  esac

  __rvm_gemset_select

  if [[ -n "$rvm_ruby_interpreter" && "system" != "$rvm_ruby_interpreter" && "default" != "$rvm_ruby_interpreter" ]] ; then
    if [[ ! -z "$rvm_ruby_version" ]] ; then
      rvm_release_version="${rvm_ruby_version/.*/}"
      rvm_major_version=${rvm_ruby_version%.*} ; rvm_major_version=${rvm_major_version#*.}
      rvm_minor_version="${rvm_ruby_version//*.}"
    fi

    rvm_ruby_package_name="${rvm_ruby_package_name:-$(echo $rvm_ruby_string | sed -e 's/-n.*$//')}"
    rvm_ruby_home="$rvm_rubies_path/$rvm_ruby_string"
    rvm_ruby_log_path="$rvm_log_path/$rvm_ruby_string"
    rvm_ruby_repo_path="$rvm_repo_path/$rvm_ruby_string"
    rvm_ruby_src_path="$rvm_src_path/$rvm_ruby_string"
    rvm_ruby_binary="$rvm_ruby_home/bin/ruby"
    rvm_ruby_irbrc="$rvm_ruby_home/.irbrc"
    rvm_ruby_gem_home="${rvm_gems_path}/${rvm_ruby_string}"
    rvm_ruby_gem_path="${rvm_ruby_gem_home}:${rvm_ruby_gem_home}@global"

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

    if [[ ! -z "$rvm_gemset_name" ]] ; then
      rvm_ruby_gem_home="${rvm_ruby_gem_home}${rvm_gemset_separator}${rvm_gemset_name}"
      rvm_ruby_gem_path="${rvm_ruby_gem_home}:${rvm_gems_path}/${rvm_ruby_string}${rvm_gemset_separator}global"
    fi

    rvm_ruby_selected_flag=1

    \mkdir -p "$rvm_ruby_log_path"

    export rvm_ruby_interpreter rvm_ruby_version rvm_ruby_repo_url rvm_ruby_package_name rvm_url rvm_ruby_patch_level rvm_ruby_configure rvm_ruby_configure_flags rvm_ruby_make rvm_ruby_make_install rvm_ruby_revision rvm_ruby_tag rvm_release_version rvm_major_version rvm_minor_version rvm_gemset_name rvm_gems_path rvm_ruby_gem_home rvm_path rvm_src_path rvm_bin_path rvm_ruby_binary rvm_ruby_home rvm_log_path rvm_ruby_log_path rvm_src_path rvm_ruby_src_path rvm_ruby_irbrc rvm_ruby_selected_flag rvm_ruby_string
  else
    rvm_ruby_interpreter="${rvm_ruby_interpreter:-system}"
  fi
}

__rvm_use() {

  if [[ -z "$rvm_ruby_selected_flag" ]] ; then __rvm_select "$@" ; fi
  if [[ -z "$rvm_ruby_interpreter" ]] ; then rvm_ruby_interpreter="system" ; fi

  if [[ "system" = "$rvm_ruby_interpreter" ]] ; then

    unset GEM_HOME GEM_PATH BUNDLE_PATH MY_RUBY_HOME RUBY_VERSION IRBRC

    new_path="$rvm_bin_path:$(__rvm_remove_rvm_from_path ; printf $PATH)"
    if [[ -s $rvm_config_path/system ]] ; then
      \grep "MY_RUBY_HOME='$rvm_rubies_path" "$rvm_config_path/system" > /dev/null
      if [[ $? -eq 0 ]] ; then
        [[ -f "$rvm_config_path/system" ]] && \rm -f $rvm_config_path/system # 'system' should *not* point to an rvm ruby.
      else
        source "$rvm_config_path/system"
      fi
    fi

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

    if [[ ! -z "$rvm_verbose_flag" ]] ; then
      "$rvm_scripts_path/log" "info" "Now using system ruby."
    fi

    export rvm_ruby_string="system"

  else
    GEM_HOME="$rvm_ruby_gem_home"
    GEM_PATH="$rvm_ruby_gem_path"
    BUNDLE_PATH="$rvm_ruby_gem_home"
    MY_RUBY_HOME="$rvm_ruby_home"
    RUBY_VERSION="$rvm_ruby_string"
    IRBRC="$rvm_ruby_irbrc"

    export GEM_HOME GEM_PATH BUNDLE_PATH MY_RUBY_HOME RUBY_VERSION IRBRC

    if [[ -z "$IRBRC" ]] ; then unset IRBRC ; fi

    if [[ ! -d $MY_RUBY_HOME ]] ; then
      "$rvm_scripts_path/log" "warn" "$rvm_ruby_interpreter $rvm_ruby_string is not installed."
      if [[ ! -z "$rvm_install_on_use_flag" ]] ; then
        "$rvm_scripts_path/manage" "install" "$rvm_ruby_string"
      else
        "$rvm_scripts_path/log" "info" "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 [[ ! -z "$rvm_verbose_flag" ]] ; then
      "$rvm_scripts_path/log" "info" "Using $(basename $GEM_HOME | \tr '-' ' ' | sed 's/'${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.
  if [[ -n "$rvm_ruby_string" ]]  ; then export rvm_ruby_string  ; fi
  if [[ -n "$rvm_gemset_name" ]]  ; then export rvm_gemset_name ; fi
  if [[ -n "$new_path" ]]; then
    export PATH="$new_path"
    unset new_path
    builtin hash -r
  fi
  if [[ -n "$rvm_rvmrc_flag" ]]   ; then __rvm_set_rvmrc ; fi

  environment_id="$(__rvm_environment_identifier)"

  if [[ -n "$rvm_default_flag" && "default" != "$rvm_ruby_interpreter" ]] ; then
    if [[ "$rvm_selfcontained" = "0" ]] ; then
      # Sets up the default wrappers.
      "$rvm_scripts_path/wrapper" "$rvm_ruby_string" --no-prefix
    else
      "$rvm_scripts_path/wrapper" "$rvm_scripts_path" "default"
    fi
    if [[ "system" = "$rvm_ruby_interpreter" ]] ; then
      "$rvm_scripts_path/alias" delete default &> /dev/null
      \find "$rvm_bin_path" -name 'default_*' -maxdepth 1 -delete
      \rm -f "$rvm_config_path/default"
      \rm -f "$rvm_environments_path/default"
      \rm -rf "$rvm_wrappers_path/default"
    else
      RUBY_VERSION="$("$rvm_ruby_home/bin/ruby" -v | sed 's#^\(.*\) (.*$#\1#')"
      export GEM_HOME GEM_PATH BUNDLE_PATH MY_RUBY_HOME RUBY_VERSION
      "$rvm_scripts_path/alias" delete default &> /dev/null
      "$rvm_scripts_path/alias" create default "$environment_id" >& /dev/null
      ln -nfs "$rvm_environments_path/$environment_id" "$rvm_environments_path/default"
      ln -nfs "$rvm_wrappers_path/$environment_id" "$rvm_wrappers_path/default"
    fi
  fi ; unset rvm_default_flag

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

  if [[ -n "$rvm_ruby_alias" ]]; then
    "$rvm_scripts_path/log" "info" "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
    unset ruby_alias rvm_ruby_alias
  fi

  unset environment_id

  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 [[ $result -eq 1 ]] ; then "$rvm_ruby_home/bin/maglev" start ; fi
    fi
  fi
  rvm_hook="after_use" ; source "$rvm_scripts_path/hook"
}

__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

  if printf "$rvm_ruby_string" | \grep -q "$rvm_gemset_separator" ; then
    set_name="${rvm_ruby_string/*${rvm_gemset_separator}/}"
  else
    set_name=""
  fi
  if [[ -n "$set_name" ]] ; then rvm_gemset_name="$set_name" ; fi

  # Alias'd rubies
  if [[ -z "$rvm_expanding_aliases" ]]; then
    rvm_ruby_string="${rvm_ruby_string:-"default"}"
    expanded_alias_name="$($rvm_scripts_path/alias show "$rvm_ruby_string" 2>/dev/null)"
    if [[ -n "$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
  ruby_string=${rvm_ruby_string/${rvm_gemset_separator}*/}

  __rvm_unset_ruby_variables

  for string in $(printf "${ruby_string//-/ }") ; do
    if [[ "head" = "$string" ]] ; then
      rvm_ruby_revision="head"
      unset rvm_ruby_patch_level rvm_ruby_revision rvm_ruby_tag
      export rvm_head_flag=1
    elif [[ "system" = "$string" ]] ; then
      rvm_ruby_interpreter="system"
      unset rvm_ruby_patch_level rvm_ruby_tag rvm_head_flag rvm_ruby_revision rvm_ruby_version rvm_gemset_name
      return
    elif [[ "nightly" = "$string" ]] ; then
      rvm_ruby_version="nightly"
      rvm_nightly_flag=1
      break
    elif "$rvm_scripts_path/match" "$string" "^preview" ; then
      rvm_ruby_patch_level="$string"
    elif "$rvm_scripts_path/match" "$string" "^rc[0-9]" ; then
      rvm_ruby_patch_level="$string"
    elif "$rvm_scripts_path/match" "$string" "^[0-9]\.[0-9]" ; then
      rvm_ruby_version="$string"
      unset rvm_ruby_revision rvm_ruby_tag
    elif "$rvm_scripts_path/match" "$string" "^p[0-9]" ; then
      rvm_ruby_patch_level="$string"
    elif [[ -n "$rvm_ruby_version" ]] && "$rvm_scripts_path/match" "$string" "^[0-9][0-9]" ; then
      if [[ "ree" = "$rvm_ruby_interpreter" ]] ; then
        rvm_ruby_patch_level="$string"
        unset rvm_ruby_revision
      elif [[ "rbx" = "$rvm_ruby_interpreter" ]] ; then
        rvm_ruby_patch_level="$string"
      elif [[ "maglev" = "$rvm_ruby_interpreter" ]] ; then
        rvm_ruby_version="$string"
        unset rvm_ruby_revision rvm_ruby_patch_level
      else
        rvm_ruby_revision="r$string"
      fi
    elif "$rvm_scripts_path/match" "$string" "^r[0-9]" ; then
      unset rvm_ruby_patch_level
      rvm_ruby_revision="$string"
    elif "$rvm_scripts_path/match" "$string" "^s[0-9]" ; then
      unset rvm_ruby_revision
      rvm_ruby_sha="$string"
    elif "$rvm_scripts_path/match" "$string" "^t[v0-9]" ; then
      unset rvm_ruby_patch_level rvm_ruby_revision
      rvm_ruby_tag="$string"
    elif "$rvm_scripts_path/match" "$string" "^m[0-9]" ; then
      rvm_ruby_mode="$string"
    elif "$rvm_scripts_path/match" "$string" "^u[a-z0-9]" ; then
      unset rvm_ruby_patch_level rvm_ruby_revision rvm_ruby_tag rvm_ruby_patch
      rvm_ruby_user_tag="$string"
    elif "$rvm_scripts_path/match" "$string" "^b[0-9][0-9]" ; then
      rvm_ruby_bits="$string"
    elif "$rvm_scripts_path/match" "$string" "^n" ; then
      rvm_ruby_name="${string/n/}"
    elif [[ "ruby rbx jruby macruby ree rubinius maglev mput shyouhei ironruby " =~ "$string " ]] ; then
      # NOTE: The space at the end of each of the above strings is *very* important.
      rvm_ruby_interpreter="$string"
    else
      "$rvm_scripts_path/log" "error" "Unknown ruby string component: '$string'"
      return 1
    fi
  done

  # Unspecified interpreter
  if [[ -z "$rvm_ruby_interpreter" ]] ; then
    if "$rvm_scripts_path/match" "$rvm_ruby_version" "^1\.[8-9]" ; then
      rvm_ruby_interpreter="ruby"
    elif "$rvm_scripts_path/match" "$rvm_ruby_version" "^0.5" ; then
      rvm_ruby_interpreter="macruby"
    elif "$rvm_scripts_path/match" "$rvm_ruby_version" "^1.[2-4]" ; then
      rvm_ruby_interpreter="jruby"
    fi
  fi

  # Unspecified version
  if [[ -z "$rvm_ruby_version" ]] && [[ -z "$rvm_head_flag" ]]; 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 [[ "$rvm_head_flag" -eq 1 ]] ; then
    rvm_ruby_string="${rvm_ruby_string}-head"
  elif [[ ! -z "$rvm_ruby_revision" ]]  ; then
    rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_revision}"
  elif [[ ! -z "$rvm_ruby_tag" ]]  ; then
    rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_tag}"
  elif [[ ! -z "$rvm_ruby_patch_level" ]]  ; then
    rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_patch_level}"
  elif [[ ! -z "$rvm_ruby_user_tag" ]]  ; then
    rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_user_tag}"
  else
    patch_level="$(__rvm_db "${rvm_ruby_interpreter}_${rvm_ruby_version}_patch_level")"
    if [[ ! -z "$patch_level" ]] ; then
      if [[ "ree" = "$rvm_ruby_interpreter" ]] || [[ "rbx" = "$rvm_ruby_interpreter" ]] ; then
        rvm_ruby_patch_level="${patch_level}"
      else
        rvm_ruby_patch_level="p${patch_level}"
      fi
    fi
    if [[ ! -z "$rvm_ruby_patch_level" ]] ; then
      rvm_ruby_patch_level="$(echo $rvm_ruby_patch_level | sed 's#^pp#p#')"
      rvm_ruby_string="${rvm_ruby_string}-${rvm_ruby_patch_level}"
      if [[ "ree" = "$rvm_ruby_interpreter" ]] || [[ "rbx" = "$rvm_ruby_interpreter" ]] ; then
        rvm_ruby_string="$(echo $rvm_ruby_string | sed 's#-p*#-#')"
      else
        rvm_ruby_string="$(echo $rvm_ruby_string | sed 's#-pp#-p#')"
        rvm_ruby_string="$(echo $rvm_ruby_string | sed 's#-prc#-rc#')"
      fi
    fi
  fi

  if [[ -n "${rvm_ruby_name}" ]] ; then
    rvm_ruby_string="${rvm_ruby_string}-n${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
  if [[ $? -gt 0 ]] ; then return 0 ; fi # Stop if no 'gem' command is available.

  rvm_ruby_global_gems_path="$rvm_gems_path/${rvm_ruby_string}${rvm_gemset_separator}global"

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

    if [[ -n "$rvm_gemset_name" ]] && ! "$rvm_scripts_path/match" "$rvm_gemset_name" "^[0-9]\.[0-9]" ; then
      rvm_ruby_gem_home="$rvm_gems_path/${rvm_ruby_string}${rvm_gemset_separator}${rvm_gemset_name}"
    else
      if [[ -n "$rvm_ruby_string" ]] && [[ "$rvm_ruby_interpreter" != "system" ]] ; then
        rvm_ruby_gem_home="$rvm_gems_path/$rvm_ruby_string"
      elif [[ -z "$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
        unset rvm_ruby_gem_home
      fi
    fi
    if [[ -z "$rvm_gemset_name" ]] ; then unset rvm_gemset_name ; fi
  else
    gemset=$(echo "$rvm_ruby_gem_home" | awk -F'@' '{print $NF}')
    if [[ -z "$rvm_ruby_string" ]] && [[ -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/${rvm_ruby_string}${rvm_gemset_separator}${rvm_gemset_name}"
      elif [[ -n "$gemset" ]] && [[ "$rvm_gemset_name" != "$gemset" ]] ; then
        rvm_ruby_gem_home="$rvm_gems_path/${rvm_ruby_string}${rvm_gemset_separator}${rvm_gemset_name}"
      fi ; unset gemset
    else
      "$rvm_scripts_path/log" "error" "Gemsets can not be used with non rvm controlled rubies (currently)."
      return 1
    fi
  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 [[ "$rvm_gemset_create_on_use_flag" -ne 1 ]] && [[ "$rvm_create_flag" -ne 1 ]] && [[ "$rvm_delete_flag" -ne 1 ]] ; then
      "$rvm_scripts_path/log" "error" "Gemset '$rvm_gemset_name' does not exist, rvm gemset create '$rvm_gemset_name' first."
      return 1
    fi
  elif [[ "$rvm_delete_flag" -eq 1 ]] ; then
    return 1
  fi

  if [[ -z "$rvm_ruby_gem_home" ]] && [[ -n $rvm_ruby_string ]] ; then
    rvm_ruby_gem_home="$rvm_gems_path/$rvm_ruby_string"
    rvm_ruby_global_gems_path="$rvm_gems_path/$rvm_ruby_string${rvm_gemset_separator}global"
  fi

  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 "$rvm_ruby_gem_home" | \grep -q 'rvm'; then
    if __rvm_using_gemset_globalcache && [[ ! -L "$rvm_ruby_gem_home/cache" ]]; then
      mv "$rvm_ruby_gem_home/cache/"*.gem "$rvm_gems_cache_path/" 2>/dev/null
      \rm -rf "$rvm_ruby_gem_home/cache"
      ln -nfs "$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 [[ -n "$rvm_ruby_gem_home" ]] ; then
    if [[ ! -d "$rvm_ruby_gem_home" ]] ; then
      if [[ "$rvm_gemset_create_on_use_flag" -eq 1 ]] || [[ "$rvm_create_flag" -eq 1 ]]; then
        "$rvm_scripts_path/gemsets" create "$rvm_gemset_name"
      else
        "$rvm_scripts_path/log" "error" "Gemset '$rvm_gemset_name' does not exist, rvm gemset create '$rvm_gemset_name' first."
        return 1
      fi
    fi

    if [[ "$rvm_interactive" -eq 1 ]] || [[ "$rvm_verbose_flag" -eq 1 ]] ; then
      "$rvm_scripts_path/log" "info" "Now using gemset '${rvm_gemset_name:-default}'"
    fi

    rvm_ruby_gem_home="$(echo "$GEM_HOME" | sed 's/'${rvm_gemset_separator}'.*$//')${rvm_gemset_separator}${rvm_gemset_name}"
    GEM_HOME="$rvm_ruby_gem_home"
    BUNDLE_PATH="$rvm_ruby_gem_home"
    GEM_PATH="$rvm_ruby_gem_home/bin:$(echo "$GEM_HOME" | sed 's/'${rvm_gemset_separator}'.*$//')${rvm_gemset_separator}global/bin"
    export rvm_ruby_gem_home GEM_HOME BUNDLE_PATH GEM_PATH

    __rvm_use # Now ensure the selection takes effect for the environment.
  fi
  return 0
}

__rvm_gemset_clear() {
  unset rvm_gemset_name ; shift
  rvm_ruby_gem_home="$(echo "$GEM_HOME" | sed "s#${rvm_gemset_separator:-'@'}.*\$##g")"
  rvm_ruby_global_gems_path="$(echo "$GEM_HOME" | sed 's/'${rvm_gemset_separator}'.*$//')${rvm_gemset_separator}global"
  GEM_HOME=$rvm_ruby_gem_home
  BUNDLE_PATH="$rvm_ruby_gem_home"
  GEM_PATH="$rvm_ruby_gem_home/bin:$rvm_ruby_global_gems_path/bin"
  export rvm_ruby_gem_home rvm_ruby_global_gems_path GEM_HOME BUNDLE_PATH GEM_PATH
  __rvm_use # Now ensure the selection takes effect for the environment.
}