Shell script to switch between MRI and jruby

Question

Working on a project which uses jRuby, but locally when I work I often use MRI because it's faster.

Now switching between to is a major annoyance, this is how I switch from jruby to MRI:

rvm use ruby-2.1.5
sed -i.bak 3s/.*/ruby" '2.1.5'"/ Gemfile 

Which replaces my Gemfile and specifies the right version of ruby. Now I wanted to create two executables from bin/ folder of my rails project, one called mri and another one jruby so I could switch back and forth between the two using a single command, and so that everyone who work in a team can use the same.

Problem with this is that, when the shell executes, the RVM doesn't change the ruby version in my current session. So naturally I get this message :

Your Ruby version is 2.0.0, but your Gemfile specified 2.1.5

1. Is this a good approach to what I'm trying to do? pretty sure I'm not the first person trying this

2. Do you already have something that works for you?

Answer 1

As the comments pointed out, you need to re-source the rvm scripts. You probably could just source ~/.bash_profile or ~/.bash_rc again, as they should be sourced there.

That being said, I haven't had this problem with rbenv , but I only swap between MRI versions. There is also a spec for a .ruby-version file see here that both RVM and rbenv honor.

For bundling bin stubs you can specify a bin path with bundle binstubs --path mri-bin .