utility

#!/usr/bin/env bash

__rvm_setup() {
  # ZSH has 1 based array indexing, bash has 0 based.
  if [[ ! -z "$ZSH_VERSION" ]] ; then
    __shell_array_start=1
    # Set clobber for zsh users, for compatibility with bash's append operator ( >> file ) behavior
    setopt | grep -qs '^noclobber$'
    rvm_zsh_clobber=$?
    setopt clobber
  else
    __shell_array_start=0
  fi ; export __shell_array_start
}

__rvm_teardown() {
  if [[ ! -z "$ZSH_VERSION" ]] ; then
    if [[ "$rvm_zsh_clobber" -eq 0 ]] ; then
      setopt noclobber
    fi ; unset rvm_zsh_clobber
  else
    :
  fi
  # Ruby strings are scoped to their action.
  # Hence, we ensure we remove them at in
  # the cleanup phase.
  unset rvm_ruby_strings
}

# Query the rvm key-value database for a specific key
# Allow overrides from user specifications in $rvm_config_path/user
__rvm_db() {
  key=$1 ; variable=$2
  if [[ -f "$rvm_config_path/user" ]] ; then
    value="$($rvm_scripts_path/db "$rvm_config_path/user" "$key")"
  fi

  if [[ -z "$value" ]] ; then
    value="$($rvm_scripts_path/db "$rvm_config_path/db" "$key")"
  fi

  if [[ ! -z "$value" ]] ; then
    if [[ -z $variable ]] ; then
      echo $value
    else
      eval "$variable=$value"
    fi
  fi
  unset key value variable
}

is_a_function() { type $1 | head -n 1 | grep -q "function" ; }

__rvm_strings() {
  unset results
  for rvm_ruby_string in $(echo $rvm_ruby_args) ; do
    #__rvm_ruby_string
    if [[ $? -gt 0 ]] ; then
      return 1
    else
      results="$results $(__rvm_select ; echo $rvm_ruby_string)"
    fi
  done
  echo $results
  unset results
  return 0
}

# Push an item onto a given array.
__rvm_push() {
  array=$1 ; shift ; item=$2
  # TODO: allow loop over more arguments.
  eval "index=\$((\${#${array}[*]} + $__shell_array_start))"
  eval "${array}[${index}]=${item}"
  unset array item
}

# Clean all *duplicate* items out of the path. (keep first occurrence of each)
__rvm_clean_path() {
  PATH=$(echo $PATH | tr -s ':' '\n' | awk '!($0 in a){a[$0];print}' | tr -s '\n' ':' | sed 's#:$##')
  export PATH
}

# Clean all rvm items out of the current working path.
__rvm_remove_rvm_from_path() {
  PATH=$(echo $PATH | tr -s ':' '\n' | grep -v "\.rvm" | tr -s '\n' ':' | sed 's#:$##')
  export PATH
}

# Run a specified command and log it.
__rvm_run() {
  log_file_name="$1" ; command="$2" ; message="$3"
  if [[ -z "$rvm_ruby_log_path" ]] ; then rvm_ruby_log_path="$rvm_log_path" ; fi
  if [[ ! -z "$message" ]] ; then $rvm_scripts_path/log "info" "$message" ; fi
  if [[ ! -z "$rvm_debug_flag" ]] ; then
    $rvm_scripts_path/log "debug" "Executing: $command"
  fi

  mkdir -p "$(dirname "$rvm_ruby_log_path/$log_file_name.log")"
  touch "$rvm_ruby_log_path/$log_file_name.log" "$rvm_ruby_log_path/$log_file_name.error.log" # for zsh :(
  echo "[$(date +'%Y-%m-%d %H:%M:%S')] $command" | tee "$rvm_ruby_log_path/$log_file_name.log" >> "$rvm_ruby_log_path/$log_file_name.error.log"
  if [[ -z "$rvm_niceness" ]] || [[ "0" = "$rvm_niceness" ]] ; then
    eval "$command" >> "$rvm_ruby_log_path/$log_file_name.log" 2>> "$rvm_ruby_log_path/$log_file_name.error.log"
  else
    eval "nice -n $rvm_niceness $command" >> $rvm_ruby_log_path/$log_file_name.log 2>> $rvm_ruby_log_path/$log_file_name.error.log
  fi
  if [[ $? -gt 0 ]] ; then $rvm_scripts_path/log "error" "Error running '$command', please check $rvm_ruby_log_path/$log_file_name*.log" ; __rvm_pushpop ; return 1 ; fi
  unset log_file command
}

# Unset both rvm variables as well as ruby-specific variables
# Preserve gemset if 'rvm_sticky' is set (persist gemset unless clear is explicitely called).
__rvm_cleanup_variables() {
  __rvm_unset_ruby_variables

  if [[ "$rvm_sticky_flag" = "1" ]] ; then export rvm_gemset_name ; else unset rvm_gemset_name  ; fi

  unset rvm_action rvm_irbrc_file rvm_command rvm_error_message rvm_url rvm_force_flag rvm_all_flag rvm_reconfigure_flag rvm_make_flags rvm_bin_flag rvm_import_flag rvm_export_flag rvm_self_flag rvm_gem_flag rvm_rubygems_flag rvm_debug_flag rvm_delete_flag rvm_summary_flag rvm_test_flag _rvm_spec_flag rvm_json_flag rvm_yaml_flag rvm_shebang_flag rvm_env_flag rvm_tail_flag rvm_use_flag rvm_dir_flag rvm_list_flag rvm_empty_flag rvm_file_name rvm_benchmark_flag rvm_clear_flag rvm_name_flag rvm_verbose_flag rvm_user_flag rvm_system_flag rvm_ruby_configure_flags rvm_uninstall_flag rvm_install_flag rvm_llvm_flag rvm_ruby_bits rvm_ruby_patch rvm_sticky_flagrvm_rvmrc_flag rvm_gems_flag rvm_only_path_flag rvm_docs_flag
}

# Unset ruby-specific variables
__rvm_unset_ruby_variables() {
  unset rvm_ruby_interpreter rvm_ruby_version rvm_url rvm_ruby_repo_url rvm_ruby_package_name rvm_ruby_patch_level rvm_ruby_make rvm_ruby_make_install rvm_ruby_revision rvm_ruby_tag rvm_release_version rvm_major_version rvm_minor_version rvm_ruby_gem_home rvm_ruby_binary rvm_ruby_home rvm_ruby_log_path rvm_ruby_src_path rvm_ruby_irbrc rvm_ruby_selected_flag rvm_ruby_src_path rvm_ruby_repo_url rvm_major_version rvm_minor_version rvm_ruby_gem_home rvm_head_flag rvm_ruby_configure rvm_ruby_mode rvm_ruby_package_file rvm_ruby_package_name rvm_ruby_gem_path rvm_ruby_name rvm_ruby_alias rvm_ruby_strings
}

__rvm_set_rvmrc() {
  if [[ "$HOME" != "$(pwd)" ]] ; then
    if [[ "$rvm_create_flag" -eq 1 ]] ; then flags="--create " ; fi
    if [[ "$rvm_verbose_flag" -eq 1 ]] ; then flags="use " ; fi

    if [[ -s .rvmrc ]] ; then
      mv .rvmrc .rvmrc.$(date +%m.%d.%Y-%H:%M:%S)
      $rvm_scripts_path/log "warning" ".rvmrc is not empty, moving aside to preserve."
    fi

    echo "rvm $flags $(basename $rvm_ruby_gem_home)" > .rvmrc
    unset flags
  else
    $rvm_scripts_path/log "error" ".rvmrc cannot be set in your home directory. \n The home .rvmrc is for global rvm settings only."
  fi

}
__rvm_load_rvmrc() {
  for rvmrc in /etc/rvmrc $HOME/.rvmrc ; do
    if [[ -f "$rvmrc" ]] ; then
      if grep -q '^\s*rvm .*$' $rvmrc ; then
        $rvm_scripts_path/log "error" "$rvmrc is for rvm settings only.\nrvm CLI may NOT be called from within $rvmrc. \nSkipping the loading of $rvmrc"
        return 1
      else
        source "$rvmrc"
      fi
    fi
  done
}

# Wrap the specified ruby code file in a Benchmark.bmbm block and execute it.
__rvm_benchmark() {
  code="require \"benchmark\" \n Benchmark.bmbm do |benchmark| \n benchmark.report(\"${rvm_ruby_file}\") do \n"
  printf "\n$code" > "$rvm_tmp_path/$$.rb"
  unset code
  cat $rvm_ruby_file >> "$rvm_tmp_path/$$.rb"
  printf "\n end \nend\n" >> "$rvm_tmp_path/$$.rb"
  rvm_ruby_args="$rvm_tmp_path/$$.rb"
  rvm_benchmark_flag=1
  rvm_action="ruby"
  if [[ ! -z "$rvm_debug_flag" ]] ; then printf "\n$rvm_tmp_path/$$.rb:\n$(cat $rvm_tmp_path/$$.rb)" ; fi
  $rvm_scripts_path/set $rvm_action $rvm_ruby_args
}


# Loop over the currently installed rubies and refresh their binscripts.
__rvm_bin_scripts() {
  for rvm_ruby_binary in $rvm_rubies_path/*/bin/ruby ; do
  if [[ -x "$rvm_ruby_binary" ]] ; then
    rvm_ruby_string=$(dirname "$rvm_ruby_binary" | xargs dirname | xargs basename)
    __rvm_select
    __rvm_bin_script
  fi
  done
}

# Write the bin/ wrapper script for currently selected ruby.
# TODO: Adjust binscript to be able to handle all rubies not just the standard interpreteres.
__rvm_bin_script() {

  if [[ -z "$rvm_ruby_selected_flag" ]] ; then __rvm_select ; fi

ruby_wrapper=$(cat <<RubyWrapper
#!/usr/bin/env bash

export GEM_HOME="$rvm_ruby_gem_home"
export GEM_PATH="$rvm_ruby_gem_path"
export BUNDLE_PATH="$rvm_ruby_gem_home"
export MY_RUBY_HOME="$rvm_ruby_home"
export PATH="$rvm_ruby_gem_home/bin:$rvm_ruby_global_gems_path/bin:$rvm_ruby_home/bin:$rvm_bin_path:\$PATH"

exec "$rvm_ruby_binary" "\$@"
RubyWrapper
)
  rm -f $rvm_bin_path/$rvm_ruby_package_name
  echo "$ruby_wrapper" > $rvm_bin_path/$rvm_ruby_package_name
  unset ruby_wrapper
  chmod +x $rvm_bin_path/$rvm_ruby_package_name
}

# Reset any rvm gathered information about the system and its state.
# rvm will refresh the stored information the next time it is called after reset.
__rvm_reset() {
  PATH="$(echo $PATH | tr ':' '\n' | awk '$0 !~ /rvm/' | paste -sd : -)"
  PATH="$rvm_bin_path:$PATH" ; export PATH

  for variable in RUBY_VERSION GEM_HOME BUNDLE_PATH MY_RUBY_HOME ; do unset $variable ; done

  for flag in default passenger editor ; do rm -f "$rvm_bin_path"/${flag}_* ; done

  for file in system default ; do
    if [[ -f "$rvm_path/$file" ]] ; then rm -f $rvm_path/$file ; fi
    if [[ -f "$rvm_config_path/$file" ]] ; then rm -f $rvm_config_path/$file ; fi
  done
  rvm_ruby_interpreter="system"
  __rvm_select

  for system_config in system_ruby system_gem_path system_user_gem_path ; do
    $rvm_scripts_path/db "$rvm_config_path/user" "$system_config" "delete"
  done ; unset system_config variable

  rm -f $rvm_bin_path/ruby $rvm_bin_path/gem $rvm_bin_path/rake $rvm_bin_path/irb $rvm_bin_path/default*
}

# Implode removes the entire rvm installation under $rvm_path.
__rvm_implode() {
  while : ; do
    $rvm_scripts_path/log "warn" "Are you SURE you wish for rvm to implode? This will remove $rvm_path ? (type 'yes' or 'no')"
    read response
    if [[ "yes" = "$response" ]] ; then
      if [[ "/" = "$rvm_path" ]] ; then
        $rvm_scripts_path/log "error" "remove '/' ?!... NO!"
      else
        if [[ -d "$rvm_path" ]] ; then
          $rvm_scripts_path/log "info" "Hai! Removing $rvm_path"
          rm -rf $rvm_path/
          echo "$rvm_path has been removed."
        else
          $rvm_scripts_path/log "info" "It appears that $rvm_path is already non existant."
        fi
      fi
      break
    elif [[ "no" = "$response" ]] ; then
      $rvm_scripts_path/log "info" "Cancelling implosion, no harm done :)"
      break
    fi
  done
}

# Output the current ruby's rvm source path.
__rvm_source_dir() {
  if [[ -z "$rvm_ruby_selected_flag" ]] ; then __rvm_select ; fi
  if [[ -z "$rvm_ruby_src_path" ]] ; then
    $rvm_scripts_path/log "fail" "No source directory exists for the default implementation."
  else
    echo "$rvm_ruby_src_path"
  fi
}

# Initialize rvm, ensuring that the path and directories are as expected.
__rvm_initialize() {
  rvm_ruby_load_path="."
  rvm_ruby_require=""

  __rvm_clean_path

  if echo $PATH | grep -q 'rvm\/bin:' ; then
    PATH=$rvm_bin_path:$PATH ; export PATH
  fi

  mkdir -p $rvm_src_path $rvm_bin_path $rvm_archives_path $rvm_gems_path $rvm_tmp_path
}

# Update rubygems or binscripts based on CLI selection.
__rvm_update() {
  __rvm_pushpop $rvm_path
  if [[ "head" = "$rvm_ruby_revision" ]] || [[ ! -z "$rvm_self_flag" ]] || [[ "update" = "$rvm_action" ]] || [[ ! -z "$rvm_update_flag" ]] ; then
    __rvm_version
    __rvm_update_rvm
  fi
  if [[ ! -z "$rvm_bin_flag" ]] ; then __rvm_bin_scripts ; fi
  if [[ ! -z "$rvm_rubygems_flag" ]] ; then __rvm_rubygems_setup ; fi

  unset rvm_update_flag rvm_action rvm_self_flag rvm_ruby_revision rvm_bin_flag rvm_rubygems_flag
  __rvm_pushpop
}

# Update rvm using rubygems
# If --head was specified, update from git repository master branch.
__rvm_update_rvm() {
  mkdir -p "$rvm_src_path"
  __rvm_pushpop "$rvm_src_path"

  if [[ "head" = "$rvm_ruby_revision" ]] || [[ -z "$system_ruby" ]] ; then
    if [[ -d "$rvm_src_path/rvm/.git" ]] ; then
      builtin cd $rvm_src_path/rvm/ && git pull origin master && ./scripts/install
    else
      builtin cd $rvm_src_path && git clone git://github.com/wayneeseguin/rvm.git && builtin cd rvm/ && ./install
    fi
  else
    stable_version=$(curl -s http://rvm.beginrescueend.com/releases/stable-version.txt)

    __rvm_run "fetch" "$rvm_scripts_path/fetch 'http://rvm.beginrescueend.com/releases/rvm-${stable_version}.tar.gz'" "fetching rvm-${stable_version}.tar.gz"

    __rvm_run "extract" "cat $rvm_archives_path/rvm-${stable_version}.tar.gz | gunzip | tar xf - -C $rvm_src_path" "Extracting $rvm_ruby_package_file ..."

    __rvm_run "install" "builtin cd $rvm_src_path/rvm-${stable_version}/ ; ./install" "Installing rvm-${stable_version}..."
  fi

  __rvm_pushpop
  rvm_hook="after_update" ; source $rvm_scripts_path/hook
}

__rvm_reboot() {
  $rvm_scripts_path/log "warn" "Do you wish to reboot rvm? ('yes', or 'no')"
  read response
  if [[ "yes" = "$response" ]] ; then
    builtin cd $rvm_path
    __rvm_reset
    mv $rvm_path/archives ~/.archives
    if [[ "/" = "$rvm_path" ]] ; then
      $rvm_scripts_path/log "error" "remove '/' ?!... NO!"
    else
      if [[ -d "$rvm_path" ]] ; then rm -rf "$rvm_path/" ; fi
    fi
    gem install rvm $rvm_gem_options
    __rvm_update_rvm
    source $rvm_path/scripts/rvm
  else
    $rvm_scripts_path/log "info" "Carry on then..."
  fi ; unset response
}

# Create the irbrc for the currently selected ruby installation.
__rvm_irbrc() {
  if [[ -d "$rvm_ruby_home" ]] && [[ ! -s "$rvm_ruby_irbrc" ]] ; then
    cp $rvm_scripts_path/irbrc $rvm_ruby_irbrc
  fi
}

# Push or Pop a directory based on zero or one directory argument provided.
__rvm_pushpop() {
  if [[ -z "$1" ]] ; then
    popd > /dev/null 2>&1
  else
    pushd "$1" > /dev/null 2>&1
  fi
}

# Save or restore the rvm's state. This is a toggle action.
# Meant for use before and after an operation that might reset the currently selected ruby.
__rvm_state() {
  if [[ -z "$rvm_state" ]] ; then
    rvm_state="$(__rvm_environment_identifier)"
    rvm_state="${rvm_state:-"system"}"
    if [[ -n "$1" ]]; then
      rvm_ruby_string="$1"
      __rvm_select
      __rvm_use
    fi
  else
    rvm_ruby_string="$rvm_state"
    __rvm_select
    __rvm_use
    unset rvm_state
  fi
}

# Output an inspection of selected 'binary' scripts, based on CLI selection.
__rvm_inspect() {
  for binary in $rvm_ruby_args ; do
    actual_file="$(command -v $binary)"
    $rvm_scripts_path/log "info" "$actual_file:"
    if [[ ! -z "$rvm_shebang_flag" ]] ; then cat $actual_file | head -n 1    ; fi
    if [[ ! -z "$rvm_env_flag" ]]     ; then cat $actual_file | awk '/ENV/'  ; fi
    if [[ ! -z "$rvm_path_flag" ]]    ; then cat $actual_file | awk '/PATH/' ; fi
    if [[ ! -z "$rvm_head_flag" ]]    ; then cat $actual_file | head -n 5    ; fi
    if [[ ! -z "$rvm_tail_flag" ]]    ; then cat $actual_file | tail -n 5    ; fi
    if [[ ! -z "$rvm_all_flag" ]]     ; then cat $actual_file                ; fi
  done
}

# Attempt to override the Darwin build settings for rubies
# This should only be used in extreme edge cases that will not work via the default way.
__rvm_make_flags() {
  # This is only an issue with Darwin :/
  if [[ "Darwin" = "$(uname)" ]] ; then
    # \ls /usr/lib/gcc/x86_64-apple-darwin10

    # Set the build & host type
    if [[ "Power Macintosh" = "$(sysctl hw.machine | awk -F: '{print $2}' | sed 's/^ //')" ]] ; then
      : # Do nothing ?
    elif [[ $(sysctl hw.cpu64bit_capable | awk '{print $2}') = 1 ]] ; then # we could also use: sysctl hw.optional.x86_64
      #   64 bit capable
      if [[ "-arch x86_64" = "$rvm_archflags" ]] ; then
        rvm_ruby_configure_flags="${rvm_ruby_configure_flags} --build=x86_64-apple-darwin$(uname -r) --host=x86_64-apple-darwin$(uname -r)"
      elif [[ "-arch i386" = "$rvm_archflags" ]] ; then
        rvm_ruby_configure_flags="${rvm_ruby_configure_flags} --build=i386-apple-darwin$(uname -r) --host=i386-apple-darwin$(uname -r)"
      else
        rvm_archflags="-arch x86_64"
        rvm_ruby_configure_flags="${rvm_ruby_configure_flags} --build=x86_64-apple-darwin$(uname -r) --host=x86_64-apple-darwin$(uname -r)"
      fi
    else
      #   32 bit capable only
      if [[ -z "$rvm_archflags" ]] ; then rvm_archflags="-arch i386" ; fi
      rvm_ruby_configure_flags="${rvm_ruby_configure_flags} --build=i386-apple-darwin$(uname -r) --host=i386-apple-darwin$(uname -r)"
    fi

    if [[ ! -z "$rvm_archflags" ]] ; then
      ARCHFLAGS="$rvm_archflags" ; export ARCHFLAGS
      # Use the latest sdk available.
      if [[ -z "$rvm_sdk" ]] ; then rvm_sdk="$(/usr/bin/basename -a /Developer/SDKs/* | awk '/^M/' | sort | tail -n 1)" ; fi
      CFLAGS="${CFLAGS:-"-isysroot /Developer/SDKs/$rvm_sdk $rvm_archflags"}" ; export CFLAGS
      LDFLAGS="${LDFLAGS:-"-Wl,-syslibroot /Developer/SDKs/$rvm_sdk $rvm_archflags"}" ; export LDFLAGS
      # CXXFLAGS="-mmacosx-version-min="$(sw_vers -productVersion | awk -F'.' '{print $1"."$2}')" -isysroot /Developer/SDKs/$rvm_sdk " ; export CXXFLAGS
    fi
  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 "$(echo $rvm_ruby_gem_home | grep "$rvm_path")" ]] ; then
  #  $rvm_scripts_path/log "warn" "Gemsets cannot be used with system ruby installs (yet)."
  #fi

  if [[ -z "$rvm_gemset_name" ]] ; then
    # No longer defaulting to 'sticky' gem sets.
    # Set 'rvm_sticky_flag=1' in ~/.rvmrc to enable.
    if [[ ! -z "$rvm_sticky_flag" ]] ; then
      if [[ ! -z "$GEM_HOME" ]] ; then
        rvm_gemset_name=$(echo $GEM_HOME | xargs basename | awk -F${rvm_gemset_separator} '{print $2}')
      fi
      if [[ ! -z "$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 [[ ! -z "$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 [[ ! -z "$rvm_ruby_string" ]] && [[ "$rvm_ruby_interpreter" != "system" ]] ; then
        rvm_ruby_gem_home="$rvm_gems_path/$rvm_ruby_string"
      elif [[ -z "$GEM_HOME" ]]  && [[ ! -z "$(command -v gem)" ]] ; then
        rvm_ruby_gem_home=$(gem env gemdir)
      elif [[ ! -z "$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" ]] && [[ ! -z "${GEM_HOME/@*/}" ]] ; then
      rvm_ruby_string=$(basename ${GEM_HOME/@*/})
    fi

    if [[ ! -z "$rvm_ruby_string" ]] ; then
      if [[ -z "$rvm_ruby_gem_home" ]] || [[ ! -z "$gemset" ]] ; then
        rvm_ruby_gem_home="$rvm_gems_path/${rvm_ruby_string}${rvm_gemset_separator}${rvm_gemset_name}"
      elif [[ ! -z "$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 [[ ! -z "$rvm_gemset_name" ]] && [[ ! -d "$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" ]] && [[ ! -z $rvm_ruby_string ]] ; then
    rvm_ruby_gem_home="$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"
  export rvm_ruby_gem_path rvm_ruby_gem_home
}

# Use a gemset specified by 'rvm_ruby_gem_home'
__rvm_gemset_use() {
  #if [[ -z "$(echo $rvm_ruby_gem_home | grep "rvm")" ]] ; then
  #  $rvm_scripts_path/log "warn" "Gemsets cannot be used with system ruby installs (yet)."
  #fi
  if [[ ! -z "$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.
}

__rvm_mono_env() {
  export DYLD_LIBRARY_PATH="$rvm_usr_path/lib:$DYLD_LIBRARY_PATH"
  export C_INCLUDE_PATH="$rvm_usr_path/include:$C_INCLUDE_PATH"
  export ACLOCAL_PATH="$rvm_usr_path/share/aclocal"
  export ACLOCAL_FLAGS="-I $ACLOCAL_PATH"
  export PKG_CONFIG_PATH="$rvm_usr_path/lib/pkgconfig:$PKG_CONFIG_PATH"
  PATH="$rvm_usr_path/bin:$PATH"
}

__rvm_environment_identifier() {
  ruby_string="$(command -v ruby)"
  if [ -n "$ruby_string" ] && echo "$ruby_string" | grep -q -F "$rvm_rubies_path"; then
    echo "$GEM_HOME" | xargs basename
  else
    echo "system"
  fi
  unset ruby_string
}

__rvm_ensure_has_enviroment_files() {
  local environment_identifier="$(__rvm_environment_identifier)"
  file_name="${rvm_environments_path}/$environment_identifier"
  if [[ ! -s "$file_name" ]] ; then
    mkdir -p "${rvm_environments_path}"
    echo "export PATH=\"${rvm_ruby_gem_home}/bin:${rvm_ruby_global_gems_path}/bin:${rvm_ruby_home}/bin:${rvm_bin_path}:\$PATH\"" > $file_name
    for variable in RUBY_VERSION GEM_HOME GEM_PATH BUNDLE_PATH MY_RUBY_HOME IRBRC rvm_ruby_string rvm_gemset_name MAGLEV_HOME ; do
      eval "export $variable"
      eval value=\$${variable}
      if [[ ! -z "$value" ]] ; then
        echo "export ${variable}='$value'" >> $file_name
      else
        echo "unset ${variable}" >> $file_name
      fi
    done ; unset variable value
  fi ; unset file_name
  # Next, ensure we have default wrapper files. Also, prevent it from recursing.
  if [[ -z "$rvm_creating_default_wrappers" ]]; then
    rvm_creating_default_wrappers=1
    directory_name="$rvm_wrappers_path/$environment_identifier"
    if [[ ! -L "$directory_name" && ! -d "$directory_name" ]]; then
      mkdir -p "$directory_name"
      # Install the default wrappers.
      $rvm_scripts_path/wrapper "$environment_identifier" &> /dev/null
    fi
    unset rvm_creating_default_wrappers directory_name
  fi
}

__rvm_Answer_to_the_Ultimate_Question_of_Life_the_Universe_and_Everything() {
  for index in {1..750} ; do perl -e 'sleep 0.2'; echo -n '.' ; done ; printf "%d" 0x2A ; echo
}

__rvm_ultimate_question() {
  printf "\nI do not know the Ultimate Question, "
  printf "\nhowever I can help you build a more "
  printf "\npowerful Ruby which can compute the "
  printf "\nUltimate Question."
}