#!/bin/bash

rvm_author="Wayne E. Seguin"
rvm_author_email="wayneeseguin@gmail.com"
rvm_website="http://github.com/wayneeseguin/rvm"
rvm_version="0.0.15"
rvm_updated="2009.08.25"

#
# License: See LICENSE
#

#
# Functions
#
function rvm-usage {

  cat <<-Usage

  About:

    rvm ${rvm_version} ${rvm_website}

    by ${rvm_author} (${rvm_author_email})

  Usage:

    rvm Action [Implementation] [Options]

  Action:

    * usage   - Show this usage information
    use       - Switch to using a specific ruby versio (new login shell)
    info      - Show information for current ruby
    list      - Show currently installed versions
    gemdir    - Switch to gem directory for installation (new login shell)
    srcdir    - Switch to src directory for the current ruby installation
    gemdup    - Clone source version gems to current version 
                (highly expiramental) Example: rvm gemdup ~/.gem/ruby/1.8/
    install   - Install a ruby version, default is from source
    uninstall - Uninstall a ruby version
    debug     - Emit environment & configuration information for *current* ruby

  Implementation:

    * ruby    - MRI/YARV Ruby (The Standard), defaults to 1.8.6
    jruby     - jRuby
    ree       - Ruby Enterprise Edition
    default   - Resets to the default system ruby
    all       - Used with install, installs all latest known versions
  
  Options: 

    -v|--version    - Ruby Package Version, defaults to 'latest'
    -l|--level      - Patch level for the specified Ruby version
    -p|--prefix     - Package and source directory prefix, with trailing slash!
                      Default is a users home directory and /usr/local/ for root
    -c|--configure  - Options for source compile (default: --enable-shared)
    -d|--debug      - Toggle debug mode on for extra messages (NYI)

  Notes:

    * Defaults above are denoted with a '*' prefix.
    * rvm is intended to be run as an individual user (not root, yet)
    * All ruby installation, configuration and source files are in ~/.rvm
    * To manually reset to defaults: "rm -f ~/.rvm/current", then open new shell
    * To preserve previous gem installations for a particular ruby version copy,
      move, symlink or copy the old gem directory to (1.8 for 1.8.X): 
      ~/.gem/\$interpreter/\$version

  Examples:

    $ gem install rvm             # Install the rvm gem
    $ rvm-install                 # Install rvm, adds hooks for bash & zsh
    $ rvm install jruby           # Install jRuby (default version is 1.3.1)
    $ rvm use ruby -v 1.9.1       # Use Ruby 1.9.1, installs if necessary
    $ rvm use 1.9                 # Equivalent to above, due to defaults
    $ rvm use 1.8                 # Use Ruby 1.8.6, installs if necessary
    $ rvm use default             # Use the system default (as if no rvm)
    $ rvm gemdup ~/.gem/ruby/1.8/ # Install gems from ~/.gem/ruby/1.8/
    $ rvm gemdir                  # Switch to gems directory for current ruby
    $ rvm gemdir system           # Switch to the system gems directory
    $ rvm gemdir system user      # Switch to the system user gems directory
    $ rvm gemdir ruby 1.9         # Switch to gems directory for ruby 1.9.1

  TODO: (in order)

    * rvm gemdup 
    * root support
    * Settings file, user overridable
    * Show current in rvm list, if applicable

  Credits:

    Bash Support Testing

      - Daniel Neighman (dneighman@gmail.com)
        irc: hassox    ; github: http://github.com/hassox

      - John Mettraux (jmettraux@openwfe.org)
        irc: jmettraux ; github: http://github.com/jmettraux
    
    ZSH Support Testing

      - Franco Lazzarino (flazzarino@gmail.com)
        irc: flazz     ; github: http://github.com/flazz

Usage

}

# Logging functions based on level
function rvm-log   { echo -e "\n $* \e[0m" ; }
function rvm-log-debug { rvm-log "\e[4;34m <d> \e[0m$*" ; }
function rvm-log-info  { rvm-log "\e[0;32m <i> \e[0m$*" ; }
function rvm-log-warn  { rvm-log "\e[0;33m <w> \e[0m$*" ; }
function rvm-log-error { rvm-log "\e[0;31m <e> \e[0m$*" ; }
function rvm-log-fail  { rvm-log "\e[0;31m <e> \e[0m$*" ; return 1 ; }

function rvm-gi { gem install -q --no-rdoc --no-ri $* ; }

function rvm-info {

  cat <<-Info

ruby:
  interpreter:  "$(ruby -v | awk '{print $1}')"
  version:      "$(ruby -v | awk '{print $2}')"
  date:         "$(ruby -v | sed 's/^.*(\([0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]\).*$/\1/')"
  platform:     "$(ruby -v | sed 's/^.*\[//' | sed 's/\].*$//')"
  patchlevel:   "$(ruby -v | sed 's/^.*(//' | sed 's/).*$//')"
  full_version: "$(ruby -v)"

homes:
  gem:          "${GEM_HOME-not set}"
  ruby:         "${MY_RUBY_HOME-not set}"

binaries:
  ruby:         "$(which ruby)"
  irb:          "$(which irb)"
  gem:          "$(which gem)"

Info

}

function rvm-install-source {

  version="${1:-1.8.6}"
  case "$version" in
    1.9|1.9.1) major="1.9" ; minor="1" ; level="${2-243}" ;;
    1.9.2)     major="1.9" ; minor="2" ; level="${2-review1}" ;;
    1.8|1.8.6) major="1.8" ; minor="6" ; level="${2-369}" ;;
        1.8.7) major="1.8" ; minor="7" ; level="${2-174}" ;;
    *) rvm-log-fail "Ruby version '$version' is unknown."
  esac

  package_name="ruby-$major.$minor-p$level"
  url="ftp://ftp.ruby-lang.org/pub/ruby/$major/$package_name.tar.gz"
 
  rvm-log-info "Installing Ruby from source to: $install_path/$package_name"
  mkdir -p $install_path/$package_name
  
  pushd $source_path > /dev/null
  if [ -d $package_name ]  ; then
    cd $package_name
  else
    if [ ! -f "$package_name.tar.gz" ] ; then 
      rvm-log-info "\tDownloading $package_name, this may take a while depending on your connection..."
      curl -O -L -s $url 
    fi
    rvm-log-info "\tExtracting $package_name..."
    tar xzf $package_name.tar.gz && cd $package_name
  fi

  rvm-log-info "\tConfiguring $package_name using ${configure-'--enable-shared'}, this may take a while depending on your cpu(s)..."
  ./configure --prefix=$install_path/$package_name ${configure-'--enable-shared'} > $install_path/$package_name/configure.log 2> $install_path/$package_name/configure.error.log

  rvm-log-info "\tCompiling $package_name, this may take a while, depending on your cpu(s)..."
  make > $install_path/$package_name/make.log 2> $install_path/$package_name/make.error.log

  rvm-log-info "\tInstalling $package_name"
  make install > $install_path/$package_name/install.log 2> $install_path/$package_name/install.error.log
  chmod +x $install_path/$package_name/bin/*

  # Create the ~/.rvm/bin/$package_name
  ln -s $install_path/$package_name/bin/ruby $install_path/bin/$package_name

  # Now install rubygems for this ruby version.
  rvm-log-info "\tInstalling rubygems dedicated to $package_name..."
  gem_package_name="rubygems-1.3.5"
  gem_url="http://rubyforge.org/frs/download.php/60718/$gem_package_name.tgz"
  if [ -d $gem_package_name ]  ; then
    cd $gem_package_name
  else
    if [ ! -f $gem_package_name.tgz ] ; then curl -O -L -s $gem_url ; fi
    tar zxf $gem_package_name.tgz && cd $gem_package_name
  fi
  # Well this is fun... fix nil error on require_paths:
  sed -i '' "s/require_paths\.join/require_paths.to_a.join/" $source_path/$package_name/$gem_package_name/lib/rubygems/gem_path_searcher.rb 
  $install_path/$package_name/bin/ruby ./setup.rb > $install_path/$package_name/rubygems.install.log 2> $install_path/$package_name/rubygems.install.error.log
  popd > /dev/null
  rvm-log-info "Installation of $package_name complete."

  for gem_name in rake ; do
    rvm-log-info "Installing $gem_name"
    $install_path/$package_name/bin/gem install $gem_name --no-rdoc --no-ri -q >> $install_path/$package_name/gems.install.log
  done
}

function rvm-install-ruby {

  case "$implementation" in

    ree)
      version=${version-1.8.6}
      patchlevel=${patchlevel-20090610}
      package_name="ruby-enterprise-$version-$patchlevel"
      url="http://rubyforge.org/frs/download.php/58677/$package_name.tar.gz"
      rvm-log-info "Installing Ruby Enterprise Edition from source to: $install_path/$package_name"
      pushd $source_path > /dev/null
      if [ -d $package_name ]  ; then
        cd $package_name
      else
        if [ ! -f "$package_name.tar.gz" ] ; then 
          rvm-log-info "\tDownloading $package_name, this may take a while depending on your connection..."
          curl -O -L -s $url
        fi
        rvm-log-info "\tExtracting $package_name..."
        tar xzf $package_name.tar.gz && cd $package_name
      fi

      rvm-log-info "\tInstalling $package_name, this may take a while, depending on your cpu(s)..."
      mkdir -p $install_path/$package_name
      ./installer -a $install_path/ruby-enterprise-$version-$patchlevel --dont-install-useful-gems > $install_path/$package_name/install.log 2> $install_path/$package_name/install.error.log 
      chmod +x $install_path/$package_name/bin/*

      ln -s $install_path/$package_name/bin/ruby $install_path/bin/$package_name

      rvm-log-info "\tInstalling rubygems dedicated to $package_name..."
      gem_package_name="rubygems-1.3.5"
      gem_url="http://rubyforge.org/frs/download.php/60718/$gem_package_name.tgz"
      if [ -d $gem_package_name ]  ; then
        cd $gem_package_name
      else
        if [ ! -f $gem_package_name.tgz ] ; then curl -O -L -s $gem_url ; fi
        tar zxf $gem_package_name.tgz && cd $gem_package_name
      fi
      # Well this is fun... fix nil error on require_paths:
      sed -i '' "s/require_paths\.join/require_paths.to_a.join/" $source_path/$package_name/$gem_package_name/lib/rubygems/gem_path_searcher.rb 
      $install_path/$package_name/bin/ruby ./setup.rb > $install_path/$package_name/rubygems.install.log 2> $install_path/$package_name/rubygems.install.error.log
      rvm-log-info "Installation of $package_name complete."
      popd > /dev/null
      
      for gem_name in rake ; do
        rvm-log-info "Installing $gem_name"
        $install_path/$package_name/bin/gem install $gem_name --no-rdoc --no-ri -q >> $install_path/$package_name/gems.install.log
      done
    ;;

    jruby)
      version=${version-1.3.1} # 1.2.0, 1.3.1
      unset patchlevel # No patchlevel for jRuby
      zipfile="$implementation-bin-$version"
      package_name="$implementation-$version"
      url="http://dist.codehaus.org/$implementation/$version/$zipfile.zip"

      rvm-log-info "Installing jRuby to: $install_path/$package_name"
      mkdir -p $install_path/$package_name
      pushd $source_path > /dev/null
      if [ -d $zipfile ]  ; then
        cd $zipfile
      else
        if [ ! -f "$zipfile.zip" ] ; then 
          rvm-log-info "\tDownloading $zipfile, this may take a while depending on your connection..."
          curl -O -L -s $url 
        fi
        rvm-log-info "\tExtracting $zipfile..."
        jar xf $zipfile.zip
      fi

      rvm-log-info "\tInstalling $package_name..."
      mkdir -p $install_path/$package_name/bin/
      rsync -ag $source_path/$package_name/ $install_path/$package_name/
      cd $source_path/$package_name/tool/nailgun && make > $install_path/$package_name/install.nailgun.log 2> $install_path/$package_name/install.error.nailgun.log 
      popd > /dev/null
      chmod +x $install_path/$package_name/bin/*
      for binary in jruby jgem jirb ; do
        ln -sf $install_path/$package_name/bin/$binary $install_path/$package_name/bin/${binary#j}
      done

      ln -s $install_path/$package_name/bin/ruby $install_path/bin/$package_name

      for gem_name in rake jruby-openssl ; do
        rvm-log-info "Installing $gem_name"
        $install_path/$package_name/bin/jgem install $gem_name --no-rdoc --no-ri -q >> $install_path/$package_name/gems.install.log
      done
    ;;

    ruby)
      rvm-install-source ${version-1.8.6} ${patchlevel-$3}
    ;;

    default)
      rvm-log-fail "please specify a ruby implementation to install."
    ;;
    *) rvm-log-fail "Ruby implementation '$implementation' is not known."

  esac

}

function rvm-uninstall {

  implementation="${1-$implementation}"
  case "$implementation" in

    jruby)
      version="${version-1.3.1}"
      if [ "$version" = "1.2.0" -o "$version" = "1.3.1" ] ; then
        package_name="jruby*-$version"
      else
        rvm-log-fail "Unknown jRuby version: $version"
      fi
    ;;

    ree)
      version=${version-1.8.6}
      if [ "$version" = "1.8.6" ] ; then
        package_name="$install_path/ruby-enterprise-$version-${3-20090610}"
      else
        rvm-log-fail "Unknown Ruby Enterprise Edition version: $version"
      fi
    ;;

    ruby)
      if [ "$version" = "1.8.7" ] ; then
        package_name="ruby-1.8.7-p${patchlevel-174}"

      elif [ "$version" = "1.8.6" -o "$version" = "1.8" ] ; then
        package_name="ruby-1.8.6-p${patchlevel-369}"

      elif [ "$version" = "1.9.2" ] ; then
        package_name="ruby-1.9.2-p${patchlevel-review1}"

      elif [ "$version" = "1.9.1" -o "$version" = "1.9" ] ; then
        package_name="ruby-1.9.1-p${patchlevel-243}"

      else
        rvm-log-fail "Unknown ruby version: $version"
      fi
    ;;

    *)
      rvm-log-fail "Ruby implementation '$implementation' is not known."

  esac

  if [ ! -z "$package_name" ] ; then
    for path in $source_path $install_path ; do
      if [ -d $path/$package_name ] ; then
        rvm-log-info "Removing $path/$package_name"
        rm -rf $path/$package_name
      fi
    done
  else
    rvm-log-fail "Cannot uninstall unknown package '$package_name'"
  fi

}

function rvm-use {

  implementation="${1-$implementation}"
  case "$implementation" in

    default)
      # TODO: There is a reproducible bug here when switching off of 1.8.7...
      #       Seems that the path is not reset properly.
      rm -f $install_path/current
      source $install_path/default
      PATH="$default_path" ; export PATH
    ;;
    #leopard) MY_RUBY_HOME="/System/Library/Frameworks/Ruby.framework/Versions/Current/usr"; GEM_HOME="$HOME/.gem/ruby/1.8" ;;

    jruby)
      version="${version-1.3.1}"
      if [ "$version" = "1.2.0" -o "$version" = "1.3.1" ] ; then
        MY_RUBY_HOME="$install_path/jruby-$version"
        GEM_HOME="$HOME/.gem/jruby/1.8"
        alias ruby_ng="jruby --ng"
        alias ruby_ng_server="jruby --ng-server"
      else
        rvm-log-fail "Unknown jRuby version: $version"
      fi
    ;;

    ree)
      version=${version-1.8.6}
      if [ "$version" = "1.8.6" ] ; then
        patchlevel="${3-20090610}"
        MY_RUBY_HOME="$install_path/ruby-enterprise-$version-$patchlevel"
        GEM_HOME="$HOME/.gem/ruby-enterprise/1.8"
      else
        rvm-log-fail "Unknown Ruby Enterprise Edition version: $version"
      fi
    ;;

    ruby)
      if [ "$version" = "1.8.7" ] ; then
        level="${patchlevel-174}"
        MY_RUBY_HOME="$install_path/ruby-1.8.7-p$level"
        GEM_HOME="$HOME/.gem/ruby/1.8"

      elif [ "$version" = "1.8.6" -o "$version" = "1.8" ] ; then
        level="${patchlevel-369}"
        MY_RUBY_HOME="$install_path/ruby-1.8.6-p$level"
        GEM_HOME="$HOME/.gem/ruby/1.8"

      elif [ "$version" = "1.9.2" ] ; then
        level="${patchlevel-review1}"
        MY_RUBY_HOME="$install_path/ruby-1.9.2-p$level"
        GEM_HOME="$HOME/.gem/ruby/1.9.2"

      elif [ "$version" = "1.9.1" -o "$version" = "1.9" ] ; then
        level="${patchlevel-243}"
        MY_RUBY_HOME="$install_path/ruby-1.9.1-p$level"
        GEM_HOME="$HOME/.gem/ruby/1.9.1"

      else
        rvm-log-fail "Unknown ruby version: $version"
      fi
    ;;

    *)
      rvm-log-fail "Ruby implementation '$implementation' is not known."

  esac

  # Now actually use it.
  if [ ! "$implementation" = "default" ] ; then
    # Install if not installed
    if [ ! -d $MY_RUBY_HOME ] ; then
      rvm-log-warn "$implementation $version is not installed."
      rvm-install-ruby $implementation $version $level
    fi

    # Set as 'current'
    RUBY_VERSION="$($MY_RUBY_HOME/bin/ruby -v | sed 's/^\(.*\) (.*$/\1/')"
    export GEM_HOME MY_RUBY_HOME RUBY_VERSION

    echo "PATH=$MY_RUBY_HOME/bin:$GEM_HOME/bin:$default_path ; export PATH" > $install_path/current
    for variable in RUBY_VERSION GEM_HOME MY_RUBY_HOME ; do
      eval "export $variable"
      eval value=\$${variable}
      echo "${variable}='$value' ; export ${variable}" >> $install_path/current
    done
  fi

  rvm-log-info "Switching to $implementation $version $patchlevel ..."
  if [ ! -z "$BASH_VERSION" ] ; then
    exec bash -l
  elif [ ! -z "$ZSH_VERSION" ] ; then
    exec zsh -l
  else
    rvm-log-fail "Your shell is not supported bash and zsh are currently supported."
  fi
}

function rvm-list {
  echo -e "\nruby:"
  ls -l $install_path/ | awk '/ ruby-[1-2].*/ { print " - " $NF  }'
  echo
  echo "jruby:"
  ls -l $install_path/ | awk '/jruby-.*/ { print " - " $NF }'
  echo
  echo "ree:"
  ls $install_path/ | awk '/ruby-enterprise-.*/ { print " - " $NF }'
  echo
}
 
function rvm-gem-dir {

  implementation=${1-$implementation}
  if [ "$implementation" = "" ] ; then implementation="current" ; fi

  case "$implementation" in
    jruby)   GEM_HOME="$HOME/.gem/jruby/1.8" ;;
    ree)     GEM_HOME="$HOME/.gem/ruby-enterprise/1.8"  ;;
    ruby)
      if [ "${2-$version}" = "1.8" -o "${2-$version}" = "1.8.6" ] ; then
        GEM_HOME="$HOME/.gem/ruby/1.8"

      elif [ "${2-$version}" = "1.9.2" ] ; then
        GEM_HOME="$HOME/.gem/ruby/1.9.2"

      elif [ "${2-$version}" = "1.9" -o "${2-$version}" = "1.9.1" ] ; then
        GEM_HOME="$HOME/.gem/ruby/1.9.1"

      else
        rvm-log-fail "Unknown Version: ${2-$version}"
      fi
    ;;
    current)
      GEM_HOME=$(ruby -r rubygems -e "puts Gem::default_path.compact.first")
    ;;
    system)
      GEM_HOME=$default_system_gem_path
    ;;
    user)
      GEM_HOME=$default_gem_path
    ;;
    *)
      rvm-log-fail "Ruby implementation '$implementation' is not known."
  esac

  if [ -d $GEM_HOME ] ; then
    echo $GEM_HOME && cd $GEM_HOME
  else
    rvm-log-fail "$implementation $version GEM directory does not exist."
  fi

}

function rvm-src-dir {
  case "${1-$implementation}" in

    jruby)
      version=${version-1.3.1}
      if [ "${2-$version}" = "1.2.0" -o "${2-$version}" = "1.3.1" ] ; then
        src_dir="$source_path/$implementation-$version"
      else
        rvm-log-fail "Unknown jRuby version: $version"
      fi
    ;;

    ree)
      version=${version-1.8.6}
      if [ "${2-$version}" = "1.8.6" -o "${2-$version}" = "1.8" ] ; then
        src_dir="$source_path/ruby-enterprise-${2-$version}-"${3-20090610}""
      else
        rvm-log-fail "Unknown Ruby Enterprise Edition version: ${2-$version}"
      fi
    ;;

    ruby)
      if [ "${2-$version}" = "1.8.7" ] ; then
        src_dir="$source_path/ruby-1.8.7-p${patchlevel-174}"

      elif [ "${2-$version}" = "1.8" -o "${2-$version}" = "1.8.6" ] ; then
        src_dir="$source_path/ruby-1.8.6-p${patchlevel-369}"

      elif [ "${2-$version}" = "1.9.2" ] ; then
        src_dir="$source_path/ruby-1.9.2-p${patchlevel-review1}"

      elif [ "${2-$version}" = "1.9" -o "${2-$version}" = "1.9.1" ] ; then
        src_dir="$source_path/ruby-1.9.1-p${patchlevel-243}"

      else
        rvm-log-fail "unknown Ruby version: ${2-$version}"
      fi
    ;;

    default)
      rvm-log-warn "Invalid request, rvm cannot change to the default source directory."
    ;;

    *)
      rvm-log-fail "Ruby implementation '$implementation' is not known."
      return 1
  esac

  if [ -d $src_dir ] ; then
    cd $src_dir
  else
    rvm-log-fail "$implementation $version source directory does not exist."
  fi

}

# clones from source implementation/version to current
function rvm-gem-dup {

  gem_dir=${1-$default_gem_path} # TODO: check for and remove trailing /gems
  if [ ! -z "$gem_dir" ] ; then
    for gem_name_version in `ls $gem_dir/gems` ; do
      gem_name=${gem_name_version%-*}
      gem_version=${gem_name_version##*-}
      if [ -d $GEM_HOME/gems/$gem_name_version ] ; then
        echo "$gem_name_version already installed."
      else
        rvm-gi $gem_dir/cache/$gem_name-$gem_version.gem
      fi
    done
  else
    rvm-log-fail "Unknown $implementation version: $version"
  fi

}

function rvm-version { echo "rvm $rvm_version ($rvm_updated) [$rvm_website]" ; }

function rvm {

  # Cleanup, aisle 3
  for variable in action implementation patchlevel version source_path install_path manager debug prefix_path ; do 
    eval "unset $variable" 
  done
  while [ $# -gt 0 ] ; do
    token="$1" ; shift
    case "$token" in 
      install|uninstall|use|path|info|setup|version|debug|srcdir|list)
                       action=$token                           ;;
      ruby|jruby|ree|default|all)
                       implementation="$token"
                       action="${action-use}"
      ;;
      gemdir)
        action=$token
        if [ "$2" = "system" ] ; then
          implementation="system" 
        elif [ "$1" = "user" ] ; then 
          implementation="user" 
        else
          implementation="current" 
        fi
      ;;
      1.8|1.8.6|1.8.7|1.9|1.9.1|1.9.2|1.2.0|1.3.1)
                       version="$token"  
                       action="${action-use}"
      ;;
      -v|--version)    
                       if [ -z "$1" ] ; then  
                         action="version"
                       else 
                         version="$1"
                       fi
                       shift
      ;;
      -l|--level)      patchlevel="$1"   ; shift               ;;
      -p|--prefix)     install_path="$1" ; shift               ;;  
      -s|--source)     source_path="$1"  ; shift               ;; # Undocumented / untested "feature"
      -c|--configure)  configure="$1"    ; shift               ;;
      -u|--gemdup)     action="gemdup" ; gem_dir="$1" ; shift  ;;
      -d|--debug)      debug=1                                 ;;
      *)               rvm-usage ; return 1
    esac 
  done 
  
  if [ -z "$implementation" -a -z "$version" ] ; then 
    implementation="default"
  else
    implementation=${implementation-'ruby'}
  fi

  # TODO: Sanitize user input, ensure that there is a / a the end...
  if [ "`whoami`" = "root" ] ; then 
    rvm-log-fail "root user support is not yet implemented."
    #prefix_path=${prefix-/usr/local/}
  else
    prefix_path=${prefix-$HOME/.}
  fi
  source_path="${source_path-"${prefix_path}rvm/src"}"
  install_path="${prefix_path}rvm"
  
  mkdir -p $prefix_path $source_path $install_path/bin

  if [ ! -f $install_path/default ] ; then 
    for variable in RUBY_VERSION GEM_HOME MY_RUBY_HOME PATH ; do
      eval "export $variable"
      eval value=\$${variable}
      echo "${variable}='$value' ; export ${variable}" >> $install_path/default
    done
  fi

  if [ -s $install_path/default_path ] ; then
    default_path=`cat $install_path/default_path`
  else
    echo $PATH > $install_path/default_path
    default_path=$PATH
  fi

  # default (user) gem path
  if [ -s $install_path/default_gem_path ] ; then
    default_gem_path=`cat $install_path/default_gem_path`
  else
    ruby -r rubygems -e "puts Gem::default_path.compact.first" > $install_path/default_gem_path
  fi

  # system gem path
  if [ -s $install_path/default_system_gem_path ] ; then
    default_system_gem_path=`cat $install_path/default_system_gem_path`
  else
    ruby -r rubygems -e "puts Gem::default_path.compact[1] || Gem::default_path.compact.first" > $install_path/default_system_gem_path
  fi

  if [ "$debug" = "1" ] ; then set -x ; fi

  case "$action" in
    install) 
      if [ "$implementation" = "all" ] ; then 
        for implementation in ruby jruby ree ; do
          if [ "$implementation" = "ruby" ] ; then
            for version in 1.8.6 1.8.7 1.9.1 1.9.2 ; do
              rvm-install-ruby $implementation $version $patchlevel 
            done
          else
              rvm-install-ruby $implementation $version $patchlevel 
          fi
        done
      else
        rvm-install-ruby $implementation $version $patchlevel 
      fi
    ;;
    uninstall) rvm-uninstall $implementation $version $patchlevel ;;
    use)       rvm-use       $implementation $version $patchlevel ;;
    list)      rvm-list                                           ;;
    gemdir)    rvm-gem-dir   $implementation $version $patchlevel ;;
    srcdir)    rvm-src-dir   $implementation $version $patchlevel ;;
    gemdup)    rvm-gem-dup   $implementation $version $patchlevel ;;
    info)      rvm-info      $implementation $version $patchlevel ;;
    version)   rvm-version                                        ;;
    debug)     
               rvm-version
               rvm-info
               rvm-log-info "PATH:$(echo $PATH | awk -F":" '{print $1":"$2":"$3":"$4":"%5}')"
               rvm-log-info ".bash_profile: \n$(cat ~/.bash_profile | tail -n 5)\n"
               rvm-log-info ".zprofile: \n$(cat ~/.zprofile | tail -n 5)\n"
               rvm-log-info "$install_path/current: \n$(cat $install_path/current)\n"
               return 0
    ;;
    *) 
               if [ ! -z "$action" ] ; then
                 rvm-log-fail  "unknown action '$action'"
               else
                 rvm-usage 
               fi
               return 1
  esac

  if [ "$debug" = "1" ] ; then set +x ; fi

}