Removing Default Ruby Gems on OSX Leopard

This post describes a quick way to remove the gems that come pre-installed on OSX Leopard.

Method
First, you should update your gems, so you have newer versions for all the gems you're about to remove. While you're at it, update rubygems as well.

sudo gem update --system

sudo gem update

Now blast the directory containing the gems that came with OSX.
sudo rm -r /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8

If, for some reason, that directory does not exist on your system, you can see rubygems stores its gems by running gem env paths. Most likely, the old gems have already been cleaned.

Enjoy being able to clean up all the old gems on your system.
sudo gem clean

Warning
Removing the gems this way is permanent. If you don't like that thought, rename the 1.8 directory to 1.8.dead, and create an empty 1.8.  This way, rubygems doesn't see the old gems, but they are still around, if you need them for some reason. So, instead of rming,
sudo mv /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8 /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8.dead
sudo mkdir /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8

Motivation
The pre-installed gems have been released 2 years ago, so they're really old by now. They need to go away. Doing a gem clean will fail to remove them. (tested with Rubygems 1.3.1 and below) What's worse, gem clean will fail to remove other old gems that you have installed so, after a while, you'll have a lot of cruft on your system.

I wrote this post because, up until now, I've been too lazy to figure out the gem cleanup situation. Now that I finally did, I want to make it easy for others to get their systems clean.

Conclusion
I've described a quick way to remove the old ruby gems that come preinstalled with OSX Leopard. This is useful because gem clean is non-functional in the presence of those gems. I hope you have found the post useful. Please comment if you have better or quicker solutions to this problem.

My first Ruby gem

This past weekend has a special importance for me. I am finally able to stand by my favorite language, Ruby, with more than just words.

To cut a long story short, I'm playing with smart cards for my research. I didn't find any good library for accessing cards from Ruby, so I was faced with either writing my own extension, or leaving my favorite language for something else. My desire for beauty triumphed over my laziness, and my first Ruby extension was born.

It wasn't as bad as I expected. It took me 4 half-days to figure out PC/SC, ruby's extension mechanism, gems, and Rubyforge. And in the fifth day I rested got it to work under Linux/Windows.

So, yay, I've made my small contribution to the Ruby community. If you're curious to check it out, go to its Rubyforge page.

Miro: offline Youtube application for Mac

I've been looking for a YouTube front-end application forever, for three reasons:

• the browser isn't integrated with my keyboard's Play / Stop buttons and my apple remote
• YouTube history sucks, as it gets wiped every session
  
• I want to watch all those illegal music videos wonderful user-generated movies offline

Here's what I found so far:


It does concurrent downloads, and tags the unseen videos. This is convenient because I can get multiple variants of the same video, and see / delete the bad dupes. Unfortunately, it doesn't meet my main request -- no integration with the keyboard or apple remote.

Hope this helps people looking for something similar! Please comment if you find something better.

Happy watching,
Victor