Everything you need to use RVM _sanely_.

.powrc

if [ -f ".rvmrc" ]; then
  source ".rvmrc"
fi

.ruby-gemset

foo

.rvmrc

if [ -f "$rvm_path/scripts/rvm" ]; then
  source "$rvm_path/scripts/rvm"
  VERSION_FROM_GEMFILE=$(perl -ne '/^ruby .([0-9\.]+).$/ && print "$1"' Gemfile)

  if [ -f ".ruby-version" ]; then
    rvm use `cat .ruby-version`
  fi

  if [[ -n $VERSION_FROM_GEMFILE ]]; then
    rvm use $VERSION_FROM_GEMFILE
  fi

  if [ -f ".ruby-gemset" ]; then
    rvm gemset use --create `cat .ruby-gemset`
  fi
fi

An rvm-setup script from @aharpole

#!/usr/bin/env bash
echo "${PWD##*/}" > .ruby-gemset
curl -o .rvmrc https://gist.githubusercontent.com/8bitDesigner/7570000/raw/4cc47262d16a777a6f087906f810110168b9164c/.rvmrc
VERSION_FROM_GEMFILE=$(perl -ne '/^ruby .([0-9\.]+).$/ && print "$1"' Gemfile)

if [[ -n $VERSION_FROM_GEMFILE ]]; then
  echo "$VERSION_FROM_GEMFILE" .ruby-version
else
  echo "2.1.1" > .ruby-version
fi

curl -o .powrc https://gist.githubusercontent.com/8bitDesigner/7570000/raw/4273909fcaf9ed7827f827b5cf8fc2d4c0465bbd/.powrc
cd .