#!/usr/bin/env bash
#
# gemsync - Standalone gemsync utility.
#
# Example:
#   gemsync --from 1.8.6 -m foo --to 1.9.1 -m bar
#
source ~/.bash_profile # load rvm

from_string=`echo "$@" | sed 's/--/;/g' | tr ';' "\n" | awk '/from/ {print}' | sed 's/from//'`
to_string=`echo "$@" | sed 's/--/;/g' | tr ';' "\n" | awk '/to/ {print}' | sed 's/to//'`

if [ -z "$from_string" ] ; then echo "Invalid arguments. Missing --from <ruby selector>" ; exit 1 ; fi
if [ -z "$to_string" ] ; then echo "Invalid arguments. Missing --to <ruby selector>" ; exit 1 ; fi

 # first we use where we want.
rvm $to_string

# Then we sync from the source.
rvm sync $from_string