""ractivate", the Missing Script for RVM"

When developing multiple projects in Ruby using RVM, I've found that it can be difficult to keep track of which binaries and gemsets you are using, and installing gems to the wrong gemsets can cause problems. Inspired by virtualenv, I've created (largely copied) a script to switch between gemsets as you move between projects while developing in Ruby.

Instructions are for OSX, but the script can be used on any UNIX-based operating system.

Create a file in your home directory called .ractivate, and paste this code:

deactivate() {
    if [ -n "$_OLD_VIRTUAL_PATH" ] ; then
        PATH="$_OLD_VIRTUAL_PATH"
        export PATH
        unset _OLD_VIRTUAL_PATH
    fi

    if [ -n "$_OLD_VIRTUAL_PS1" ] ; then
        PS1="$_OLD_VIRTUAL_PS1"
        export PS1
        unset _OLD_VIRTUAL_PS1
    fi

    if [ -n "$_RUBY_PROJECT_DIR" ] ; then
        rvm gemset use default
        unset _RUBY_PROJECT_DIR
    fi

    unset RUBY_PROJECT_DIR
    if [ ! "$1" = "nondestructive" ] ; then
        unset -f deactivate
    fi
}

# unset irrelavent variables
deactivate nondestructive

_RUBY_PROJECT_DIR="`pwd`"
export _RUBY_PROJECT_DIR

_OLD_VIRTUAL_PATH="$PATH"
PATH="$_RUBY_PROJECT_DIR/bin:$PATH"
export PATH

rvm gemset use `basename "$_RUBY_PROJECT_DIR"`

_OLD_VIRTUAL_PS1="$PS1"
if [ "x" != x ] ; then
    PS1="$PS1"
else
    PS1="(`basename \"$_RUBY_PROJECT_DIR\"`) $PS1"
fi
export PS1

# vim: ft=config

Create an alias for the script in .profile (also found in your home directory).

alias ractivate='source ~/.ractivate'

The idea is to create/use gemsets that match the directory name of your Ruby project. Ex:

Ractivate

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