#!/bin/bash

# __rvm_select implementation version patch_level
function __rvm_select {
  if [ ! -z "$rvm_ruby_string" ] ; then
    __rvm_ruby_string
  elif [ ! -z "$rvm_ruby_selector" ] ; then
    if [ ! -z "$(echo $rvm_ruby_selector | awk '/^[0-9]/')" ] ; then
      rvm_ruby_interpreter="${rvm_ruby_interpreter:-ruby}"
      rvm_ruby_version=$rvm_ruby_selector
    else
      rvm_ruby_interpreter="$rvm_ruby_selector"
      unset rvm_ruby_version
    fi
  elif [ ! -z "$rvm_ruby_interpreter" ] ; then
    if [ ! -z "$(echo $rvm_ruby_interpreter | awk '/^[0-9]/')" ] ; then
      rvm_ruby_version=$rvm_ruby_interpreter
      rvm_ruby_interpreter="ruby"
    else
      rvm_ruby_interpreter="${rvm_ruby_interpreter:-ruby}" # Default is standard ruby
    fi
  fi

  if [ "$rvm_ruby_version" = "1.8" ] ; then rvm_ruby_version="1.8.6" ; fi
  if [ "$rvm_ruby_version" = "1.9" ] ; then rvm_ruby_version="1.9.1" ; fi

  case "$rvm_ruby_interpreter" in
    macruby)
      if [ "`uname`" = "Darwin" ] ; then
        rvm_ruby_repo_url="${rvm_ruby_repo_url:-`__rvm_db "macruby_repo_url"`}"
        rvm_ruby_version="head"
        rvm_ruby_package_name=${rvm_ruby_interpreter}-${rvm_ruby_version}
        #rvm_ruby_version="${rvm_ruby_version:-`__rvm_db "macruby_version"`}"
        #rvm_ruby_package_name=${rvm_ruby_interpreter}_nightly-${rvm_ruby_version}
        #rvm_url="http://dl.getdropbox.com/u/163257/$rvm_ruby_package_name.pkg" # 'nightly' builds
        unset rvm_ruby_patch_level
      else
        __rvm_log "fail" "MacRuby can only be installed on a Darwin OS."
      fi
    ;;

    rbx|rubinius)
      rvm_ruby_version="head"
      unset rvm_ruby_patch_level
      rvm_ruby_interpreter="rubinius"
      rvm_ruby_repo_url=${rvm_rbx_repo_url:-`__rvm_db "rubinius_repo_url"`}
      rvm_url=$rvm_ruby_repo_url
      rvm_ruby_configure=""
      rvm_ruby_make="build"
      rvm_ruby_make_install=""
      #rvm_ruby_rev="head"
    ;;

    jruby)
      rvm_ruby_version="${rvm_ruby_version:-`__rvm_db "jruby_version"`}"
      rvm_jruby_repo_url="${rvm_jruby_repo_url:-"git://kenai.com/jruby~main"}"
      if [ ! -z "$(echo $rvm_ruby_version | awk '/^1.4/')" ] ; then
        rvm_ruby_version="1.4.0RC1"
        rvm_package_file="$rvm_ruby_interpreter-bin-${rvm_ruby_version}"
      else
        rvm_package_file="$rvm_ruby_interpreter-bin-$rvm_ruby_version"
      fi
      rvm_url="http://dist.codehaus.org/$rvm_ruby_interpreter/$rvm_ruby_version/$rvm_package_file.tar.gz"
      unset rvm_ruby_patch_level
      if [ -z "$(echo $rvm_ruby_version | awk '/^1\.[2-4]/')" ] ; then
        __rvm_log "fail" "Unknown jRuby version: $rvm_ruby_version"
      fi
      alias jruby_ng="jruby --ng"
      alias jruby_ng_server="jruby --ng-server"
    ;;

    ruby-enterprise|ree)
      rvm_ruby_interpreter="ree"
      rvm_ruby_interpreter=`__rvm_db "ree_interpreter"`
      rvm_ruby_version=${rvm_ruby_version:-`__rvm_db "ree_version"`}
      rvm_ruby_patch_level="${3:-`__rvm_db "ree_${rvm_ruby_version}_patch_level"`}"
      rvm_ruby_package_name="ruby-enterprise-$rvm_ruby_version-$rvm_ruby_patch_level"
      if [ -z "$(echo $rvm_ruby_version | awk '/^1\.8/')" ] ; then
        __rvm_log "fail" "Unknown Ruby Enterprise Edition version: $rvm_ruby_version"
      fi
    ;;

    ruby)
      if [ ! -z "$rvm_ruby_tag" ] ; then
        rvm_ruby_version=$(echo $rvm_ruby_tag | sed 's/^v//' | sed 's/\///' | awk -F'_' '{print 1 "." $2 "." $3 }')
        rvm_ruby_patch_level=$rvm_ruby_tag # $(echo $rvm_ruby_tag | sed 's/^v//' | sed 's/\///' | awk -F'_' '{print $4 }')
      fi
      if [ -z "$rvm_ruby_version" ] ; then
        rvm_ruby_version=`__rvm_db "ruby_version"` # Default verison is 1.8.6
      fi
      rvm_ruby_patch_level=${rvm_ruby_patch_level:-`__rvm_db "ruby_${rvm_ruby_version}_patch_level"`} # Default verison is 1.8.6
      if [ -z "rvm_ruby_patch_level" ] ; then unset rvm_ruby_patch_level ; fi

      if [ -z "rvm_ruby_version" ] ; then
        __rvm_log "fail" "Unknown ruby version: $rvm_ruby_version"
      fi
    ;;

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

    *)
      if [ ! -z "$MY_RUBY_HOME" ] ; then
        rvm_ruby_string=$(basename $MY_RUBY_HOME)
        __rvm_select
      else
        __rvm_log "fail" "Ruby implementation '$rvm_ruby_interpreter' is not known."
      fi
  esac

  if [ ! -z "$rvm_ruby_rev" ] ; then
    if [ "$rvm_ruby_rev" = "head" -o "$rvm_ruby_rev" = "trunk" ] ; then
      rvm_ruby_patch_level="head"
    else
      rvm_ruby_patch_level="$rvm_ruby_rev"
    fi
  fi

  if [ -z "$rvm_gem_set_name" ] ; then
    gemset=$(gem env gemdir | xargs basename | sed "s/${rvm_ruby_version}-//")
    if [ "$gemset" != "$rvm_ruby_version" ] ; then
      rvm_gem_set_name="$gemset"
    else
      unset rvm_gem_set_name
    fi ; unset gemset
  fi

  if [ ! -z "$rvm_ruby_interpreter" -a ! -z "$rvm_ruby_version" -a "$rvm_ruby_interpreter" != "system" ] ; then
    rvm_major_version=$(echo $rvm_ruby_version | awk -F'.' '{ print $2 }')
    rvm_minor_version=$(echo $rvm_ruby_version | awk -F'.' '{ print $3 }')

    if [ -z "$rvm_gem_set_name" ] ; then
      rvm_gem_home="$rvm_gem_path/$rvm_ruby_interpreter/$rvm_ruby_version"
    else
      if [ ! -z "$rvm_gem_set_name_rm" -a -d $rvm_gem_path/$rvm_ruby_interpreter/$rvm_ruby_version-$rvm_gem_set_name ] ; then
        rm -rf $rvm_gem_path/$rvm_ruby_interpreter/$rvm_ruby_version-$rvm_gem_set_name/
        if [ "$rvm_gem_set_name_rm" = "$rvm_gem_set_name" ] ; then unset rvm_gem_set_name ; fi
      else
        rvm_gem_home="$rvm_gem_path/$rvm_ruby_interpreter/$rvm_ruby_version-$rvm_gem_set_name"
      fi
    fi

    mkdir -p $rvm_gem_home

    if [ -z "$rvm_ruby_patch_level" ] ; then
      rvm_ruby_package_name="${rvm_ruby_package_name:-"$rvm_ruby_interpreter-$rvm_ruby_version"}"
      rvm_ruby_home="${rvm_ruby_home:-"$rvm_path/$rvm_ruby_interpreter-$rvm_ruby_version"}"
    else
      if [ "$rvm_ruby_interpreter" != "ruby-enterprise" ] ; then
        if [ ! -z "`echo $rvm_ruby_patch_level | awk '/^[0-9]/'`" ] ; then
          rvm_ruby_patch_level="p$rvm_ruby_patch_level"
        fi
        rvm_ruby_patch_level="`echo $rvm_ruby_patch_level | sed 's/^pp/p/'`" # sanity check, thanks sfpyra
      fi
      rvm_ruby_package_name="${rvm_ruby_package_name:-"$rvm_ruby_interpreter-$rvm_ruby_version-$rvm_ruby_patch_level"}"
      rvm_ruby_home="${rvm_ruby_home:-"$rvm_path/$rvm_ruby_interpreter-$rvm_ruby_version-$rvm_ruby_patch_level"}"
    fi
    rvm_ruby_string="$rvm_ruby_package_name"
    rvm_ruby_log_path="$rvm_log_path/$rvm_ruby_package_name"
    rvm_ruby_src_path="$rvm_source_path/$rvm_ruby_string"
    rvm_ruby_binary="$rvm_ruby_home/bin/ruby"
    rvm_ruby_irbrc="$rvm_ruby_home/.irbrc"
    rvm_selected=1

    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_make rvm_ruby_make_install rvm_ruby_rev rvm_ruby_tag rvm_major_version rvm_minor_version rvm_gem_set_name rvm_gem_path rvm_gem_home rvm_path rvm_source_path rvm_bin_path rvm_ruby_binary rvm_ruby_home rvm_log_path rvm_ruby_log_path rvm_source_path rvm_ruby_src_path rvm_ruby_irbrc rvm_selected rvm_ruby_string
  else
    rvm_gem_home=$GEM_HOME
  fi
}

function __rvm_use {
  if [ -z "$rvm_selected" ] ; then __rvm_select $* ; fi
  if [ -z "$rvm_ruby_interpreter" ] ; then rvm_ruby_interpreter="default" ; fi

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

    PATH=$(echo $PATH | tr ':' '\n' | awk '$0 !~ /rvm/' | paste -sd : -)
    PATH=$rvm_bin_path:$PATH ; export PATH

    if [ -s $rvm_path/default ] ; then
      source $rvm_path/default
    else
      rvm_ruby_interpreter="system"
      __rvm_log "warn" "no default rvm specified, defaulting to pre-rvm sytem."
      unset GEM_HOME GEM_PATH MY_RUBY_HOME RUBY_VERSION IRBRC
      if [ -s $rvm_path/system ] ; then source $rvm_path/system ; fi
    fi

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

    unset GEM_HOME GEM_PATH MY_RUBY_HOME RUBY_VERSION IRBRC
    PATH=$(echo $PATH | tr ':' '\n' | awk '$0 !~ /rvm/' | paste -sd : -)
    PATH=$rvm_bin_path:$PATH ; export PATH
    if [ -s $rvm_path/system ] ; then
      grep "^MY_RUBY_HOME='$rvm_path" "$rvm_path/system" > /dev/null
      if [ $? -eq 0 ] ; then
        rm -f $rvm_path/system # 'system' should *not* point to an rvm ruby.
      else
        source $rvm_path/system
      fi
    fi

  else
    GEM_HOME=$rvm_gem_home ; export GEM_HOME
    GEM_PATH=$rvm_gem_home ; export GEM_PATH
    MY_RUBY_HOME=$rvm_ruby_home ; export MY_RUBY_HOME
    RUBY_VERSION=$rvm_ruby_package_name ; export RUBY_VERSION
    IRBRC="$rvm_ruby_irbrc" ; export IRBRC
    if [ -z "$IRBRC" ] ; then unset IRBRC ; fi

    if [ ! -d $MY_RUBY_HOME ] ; then
      __rvm_log "warn" "$rvm_ruby_interpreter $rvm_ruby_version is not installed."
      if [ ! -z "$rvm_install_on_use_flag" ] ; then
        __rvm_install_ruby $rvm_ruby_interpreter $rvm_ruby_version $rvm_ruby_patch_level
      fi
    fi

    __rvm_irbrc

    PATH=$(echo $PATH | tr ':' '\n' | awk '$0 !~ /rvm/' | paste -sd : -)
    PATH=$rvm_bin_path:$PATH ; export PATH
    PATH=$MY_RUBY_HOME/bin:$GEM_HOME/bin:$rvm_path/bin:$PATH ; export PATH

  fi

  if [ ! -z "$rvm_default_flag" -a "$rvm_ruby_interpreter" != "default" ] ; then
    if [ "$rvm_ruby_interpreter" = "system" ] ; then
      rm -f $rvm_path/default
      rm -f $rvm_path/bin/default*
    else
      RUBY_VERSION="$($MY_RUBY_HOME/bin/ruby -v | sed 's/^\(.*\) (.*$/\1/')"
      export GEM_HOME GEM_PATH MY_RUBY_HOME RUBY_VERSION

      echo "PATH=$MY_RUBY_HOME/bin:$GEM_HOME/bin:$rvm_path/bin:\$PATH ; export PATH" > $rvm_path/default

      for variable in RUBY_VERSION GEM_HOME GEM_PATH MY_RUBY_HOME IRBRC ; do
        eval "export $variable"
        eval value=\$${variable}
        if [ ! -z "$value" ] ; then
          echo "${variable}='$value' ; export ${variable}" >> $rvm_path/default
        else
          echo "unset ${variable}" >> $rvm_path/default
        fi
      done ; unset variable value

      if [ -s $rvm_path/bin/$rvm_ruby_package_name ] ; then
        ln -fs $rvm_path/bin/$rvm_ruby_package_name $rvm_path/bin/default-ruby # So that people know what it's for :)
        ln -fs $rvm_path/bin/gem-$rvm_ruby_package_name $rvm_path/bin/default-gem
        ln -fs $rvm_path/bin/irb-$rvm_ruby_package_name $rvm_path/bin/default-irb
      else
        rm -f $rvm_path/bin/default*
      fi
    fi
    unset rvm_default_flag
  fi

  if [ ! -z "$rvm_load_flag" ] ; then __rvm_gemset_load ; fi
  if [ ! -z "$rvm_dump_flag" ] ; then __rvm_gemset_dump ; fi
}

function __rvm_ruby_string {
  if [ "$rvm_ruby_interpreter" = "system" ] ; then
    rvm_ruby_string="system"
  elif [ ! -z "$rvm_ruby_string" ] ; then
    rvm_ruby_string=`echo "$rvm_ruby_string" | sed 's/ruby-enterprise/ree/g'` # dash-antics :)
    rvm_ruby_interpreter=`echo $rvm_ruby_string |  tr '-' ' ' | awk '{print $1}'`
    rvm_ruby_version=`echo $rvm_ruby_string | awk -F'-' '{print $2}'`
    revision=`echo $rvm_ruby_string | awk -F'-' '{print $3}'`

    if [ "$revision" = "head" -o "$revision" = "preview" ] ; then
      rvm_ruby_revision="$revision"
    else
      echo $revision | grep '^p[0-9]\+' > /dev/null
      if [ $? -eq 0 ] ; then
        rvm_ruby_patch_level=`echo $revision | awk -F'p' '{print $2}'`
      else
        echo $revision | grep '^[0-9]\+' > /dev/null
        if [ $? -eq 0 ] ; then
          rvm_ruby_rev="$revision"
        else
          unset rvm_ruby_patch_level rvm_ruby_rev
        fi
      fi
    fi
  fi
  return 0
}