bundler is a great way to manage the gem dependencies in your Ruby project.
One of bundler's nifty features is the bundle exec command which allows
you to run an executable (such as rake) in the context of your bundled gem
dependencies. In other words, you'll only be able to access the gems that
you've told bundler that you want to use.
To run a command in this way you need to prefix it with 'bundle exec', like so:
$ bundle exec rake my:task
It's something that you really ought to be doing whenever you run a ruby script within a bundled project, but, alas, it can become a chore.
Enter bundler-exec, which takes care of automatically pre-pending "bundle exec" to the beginning of common Ruby commands.
- Copy bundler-exec.sh to ~/.bundler-exec.sh.
- Source it from your ~/.bashrc file.
For example:
$ curl -L https://raw.githubusercontent.com/gma/bundler-exec/main/bundler-exec.sh > ~/.bundler-exec.sh
$ echo "[ -f ~/.bundler-exec.sh ] && source ~/.bundler-exec.sh" >> ~/.bashrc
Er, that's it...
You can get bundler by installing the gem:
$ gem install bundler
See http://github.com/carlhuda/bundler for more about bundler.
To check that bundler-exec has been installed properly, use the type
shell built-in command to see what it will do when you run ruby. It
should tell you it's an alias, like this:
$ type ruby
ruby is aliased to `run-with-bundler ruby'
If so, whenever you run ruby (or any of the other commands listed in
the BUNDLED_COMMANDS variable) you'll actually be running it with
bundle exec.
If you want to run one of these commands without bundler exec you can
use which to find the full path to executable and then run it, like
this:
$ $(which ruby) -e 'puts "hello"'