setup function for ~/.rvmrc

.rvmrc

# This function will pull an .rvmrc from a gist and place it in a directory
# Add this function to /home/username/.rvmrc
#
# usage: setup_rvmrc gemset /path/to/application/
# example setup_rvmrc 1.9.2@app /var/www/app/
#
# NOTE: The trailing slash on the path is important.

function setup_rvmrc() {
  _REPO="git://gist.github.com/1080580.git"
  _GIT=$(which git)
  _SED=$(which sed)
  _MKTEMP=$(which mktemp)

  if [ -d "$2" -a -w "$2" ];
  then
    _TMP=$($_MKTEMP -d /tmp/set_rvmrc.XXXXXX)
    $_GIT clone $_REPO $_TMP
    $_SED -i "s/^rvm [^@]*@.*/rvm $1/" $_TMP/.rvmrc
    cp -vf $_TMP/.rvmrc ${2}
    rm -rf $_TMP
  fi
}