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CHAPTER 7 PROJECTS AND LIBRARIES
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Note For Linux users: If you get errors during installation that say certain libraries are missing (such as
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YAML or Zlib), you re probably using a preinstalled version of Ruby that came with your Linux distribution. If you don t want to install a fresh version of Ruby from source (which is usually the best idea, and is covered in 1), your distribution might let you install these missing libraries using its package management system. For example, on Ubuntu or Debian, apt-get libyaml-ruby and apt-get libzlib-ruby can commonly resolve the problem.
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After installation, the main RubyGems application, gem, should be in a directory that s included in your path (such as /usr/bin/ or /usr/local/bin/), and so should run immediately from the command line by typing gem and pressing Enter. If it does not, it will be necessary to find where gem is installed and add its directory to your path. Alternately, you could use gem in future by prefixing it with its full location (for example, /usr/bin/gem).
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Note It s possible to install RubyGems in a local, user directory if you don t have permission to install
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it system wide. To learn more about this, refer to the RubyGems documentation at http://docs.
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rubygems.org/.
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Finding Gems
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One of the things it s useful to do is to get a list of the gems that are installed on your machine, as well as get a list of the gems available for download and installation. To do this, you use gem s list command. If you run gem list from your command line, you ll get a result similar to this:
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*** LOCAL GEMS *** sources (0.0.1) This package provides download sources for remote gem installation
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It s not much, but it s a start. This list shows that you have the sources gem installed (version 0.0.1) and a basic description of the gem. You can query the remote gem server (currently hosted by RubyForge) like so:
gem list --remote
CHAPTER 7 PROJECTS AND LIBRARIES
*** REMOTE GEMS *** abstract (1.0.0) a library which enables you to define abstract method in Ruby ackbar (0.1.1, 0.1.0) ActiveRecord KirbyBase Adapter action_profiler (1.0.0) A profiler for Rails controllers actionmailer (1.2.3, 1.2.2, 1.2.1, 1.2.0, 1.1.5, 1.1.4, 1.1.3, 1.1.2, 1.1.1, 1.0.1, 1.0.0, 0.9.1, 0.9.0, 0.8.1, 0.8.0, 0.7.1, 0.7.0, 0.6.1, 0.6.0, 0.5.0, 0.4.0, 0.3.0) Service layer for easy email delivery and testing. [..1,000s of lines about other gems removed for brevity..]
Within a minute or so, many hundreds of gems and descriptions should go flying past (do allow a couple minutes though, as RubyForge can often be extremely busy). Wading through such a list is impractical for most purposes, but generally you ll be aware of which gem you want to install before you get to this stage. People on the Internet will recommend gems, or you ll be asked to install a particular gem by this book or another tutorial. However, if you wish to browse, the best way to do so is to visit http:// rubyforge.org/, the home for the RubyGems repository. RubyForge features search tools and more information about each gem in the repository. Alternatively, you can use the search features offered by the gem program directly, like so:
gem query --remote --name-matches class
*** REMOTE GEMS *** calibre-classinherit (2.1.0) Provides class-level inheritance for mixin modules. calibre-classmethods (2.0.0, 1.0.0) Provides class-level inheritance for included modules.
CHAPTER 7 PROJECTS AND LIBRARIES
calibre-nackclass (0.5.1) Nack, which stands for Not-ACKnowledged, is a more efficient tool for deferable errors. calibre-nullclass (1.0.0) Null is a alternate to Nil that's doesn't raise NoMethodError. classifier (1.3.0, 1.2.0, 1.1.1, 1.1, 1.0) A general classifier module to allow Bayesian and other types of classifications. classroom (0.0.2, 0.0.1) ClassRoom is a 'class server' based on DRb
In this case, you asked the repository for all gems with names including the word class.
Note In 16, we re going to look at a large collection of RubyGems and other libraries and see
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