Category Archives: ruby

rbenv and rubygems on a osx installation

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Edit:

I had tried to install on Ubuntu, I had to install some extra packages to build ruby,

$ sudo apt-get install build-essential zlib1g zlib1g-dev zlibc libxml2 libxml2-dev libxslt-dev libssl-dev

End Edit;

I really like rvm because it has lots of great features and I never had a problem with it when I used it, but I wanted to give rbenv a try. Finally, I had a fresh installation of Lion to try it on. I followed all the steps found in the rbenv wiki, followed by downloading and installing the latest version of Ruby and RubyGems.

The following are my steps that I want to use as a reminder of what I did. I opted not to install via homebrew, which would probably have been easier, but I always like doing things the hard way first to figure out how it all works. I also had to install xcode, in order to compile new gems and ruby versions.

Installing rbenv:

~ $ git clone git://github.com/sstephenson/rbenv.git .rbenv
~ $ echo 'export PATH="$HOME/.rbenv/bin:$HOME/.rbenv/shims:$PATH"' >> ~/.zshrc
~ $ echo 'eval "$(rbenv init -)"' >> ~/.zshrc
~ $ source ~/.zshrc

That’s it for install rbenv, now I need to install ruby.

Since I opted to install rbenv the hard way, I also opted not to install ruby-build, and download the ruby source directly from http://ruby-lang.org. I got ruby-1.9.2-p290 and ruby-1.8.7-p352 tarballs.

Installing ruby:

~/Downloads/ruby-1.9.2-p290 $ ./configure --prefix=$HOME/.rbenv/versions/1.9.2-p290
~/Downloads/ruby-1.9.2-p290 $ make && make install

Refresh rbenv after installing gems and ruby versions:

~ $ rbenv rehash

I check the version available, and then set my global preference to the latest installed version:

~ $ rbenv versions
  1.9.2-p290
~ $ rbenv global 1.9.2-p290
~ $ rbenv versions
* 1.9.2-p290

Next, I wanted to install the bundler gem, but I found out that by default ‘gem’ executable is pointing to the OSX version. After confirming I was installing into the right version of ruby, I needed to download and install rubygems.

~/Downloads/rubygems-1.8.10 $ ruby --version
ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin11.1.0]
~/Downloads/rubygems-1.8.10 $ ruby setup.rb

Then I need to rebuild the rbenv shim binaries to get the gem executable.

~ $ rbenv rehash

That’s it. I double checked the gem version I was running:

~ $ gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.10
  - RUBY VERSION: 1.9.2 (2011-07-09 patchlevel 290) [x86_64-darwin11.1.0]
  - INSTALLATION DIRECTORY: /Users/beverlyguillermo/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1
  - RUBY EXECUTABLE: /Users/beverlyguillermo/.rbenv/versions/1.9.2-p290/bin/ruby
  - EXECUTABLE DIRECTORY: /Users/beverlyguillermo/.rbenv/versions/1.9.2-p290/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-darwin-11
  - GEM PATHS:
     - /Users/beverlyguillermo/.rbenv/versions/1.9.2-p290/lib/ruby/gems/1.9.1
     - /Users/beverlyguillermo/.gem/ruby/1.9.1
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - http://rubygems.org/

Happy with all of that, I installed any gems I wanted. Yea, rbenv!

Multiline comments in ruby

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I have noticed a lot of books or sites don’t say how to do multi-line comments in ruby. Well, you can use the ruby documentation blocks –

=begin

and

=end

Anything in between the two lines will be “commented” out. The purpose of the above lines is for documentation though, but it’s really useful to “temporarily” block on multiple lines of code…

For true comments, do single line commenting…

Vim and Single Line Commenting

If you wanted to do single line commenting (i.e., adding # in front of the line) in Vim, use the regex search and replace.

Visually select the lines (using Shift-v and the arrow keys to select), then going into command mode by enter ‘:’ (colon), where you get something like this

:'<,'>

Then all you have to do is enter

:'<,'>s!^!#!g