oh-my-fish/plugins/rvm/rvm.fish

function rvm -d 'Ruby enVironment Manager'
  # run RVM and capture the resulting environment
  set -l env_file (mktemp -t rvm.fish.XXXXXXXXXX)
  bash -c '[ -e ~/.rvm/scripts/rvm ] && source ~/.rvm/scripts/rvm || source /usr/local/rvm/scripts/rvm; cd .;rvm "$@"; status=$?; env > "$0"; exit $status' $env_file $argv

  # grep the rvm_* *PATH RUBY_* GEM_* variables from the captured environment
  # exclude lines with _clr and _debug
  # apply rvm_* *PATH RUBY_* GEM_* variables from the captured environment

  and eval (grep '^rvm\|^[^=]*PATH\|^RUBY_\|^GEM_' $env_file |grep -v _clr |grep -v _debug| sed '/^[^=]*PATH/y/:/ /; s/^/set -xg /; s/=/ /; s/$/ ;/; s/(//; s/)//')

  # clean up
  rm -f $env_file
end