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Installing a Simple Gem
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Once you ve found the name of a gem you wish to install, you can install it with a single command at the command line (where feedtools would be replaced with the name of the gem you wish to install, although feedtools is a fine gem to test with):
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gem install feedtools
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Caution On Unix-related platforms (including OS X and Linux), you re likely to receive an error shortly thereafter, complaining that you don t have permission to install the gem. The reason for this is that Ruby is usually installed as a system application, and your current user doesn t have the privileges to install new libraries at the system level. To resolve this, you can either switch to the root user and re-run the gem install command, or use sudo: sudo gem install feedtools.
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CHAPTER 7 PROJECTS AND LIBRARIES
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If all goes well, you ll get output like this:
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Attempting local installation of 'feedtools' Local gem file not found: feedtools*.gem Attempting remote installation of 'feedtools' Updating Gem source index for: http://gems.rubyforge.org Successfully installed feedtools-0.2.26 Installing RDoc documentation for feedtools-0.2.26...
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First, RubyGems looks to see if the gem exists in the current directory (you can keep your own store of gems locally, if you like), and if not, it heads off to RubyForge to download the gem and install it from afar. Last, it builds the documentation for the library using rdoc (covered in 8), and installation is complete. This process is the same for nearly all gems.
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Note In many cases, installing one gem requires other gems to be installed too. That is, the gem you re
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trying to install might have other gems it needs to operate. If this is the case, gem will tell you, and will install the required gems in each case if you agree.
If you run gem list again at this point, your local list of gems will include the newly installed gem (in this case, feedtools).
Using Gems
As the RubyGems system isn t an integrated part of Ruby, it s necessary to tell your programs that you want to use and load gems. To demonstrate how gems can be used, you ll install the redcloth gem, a library that can convert specially formatted text into HTML, ready to be used on a Web page. Use gem install redcloth (or sudo gem install redcloth, if you aren t running as root or a superuser), as demonstrated earlier, to install the gem. Once the gem is installed, run irb or create a new Ruby source file, and use the redcloth gem like so:
require 'rubygems' require 'RedCloth' r = RedCloth.new("this is a *test* of _using RedCloth_") puts r.to_html
CHAPTER 7 PROJECTS AND LIBRARIES
<p>this is a <strong>test</strong> of <em>using RedCloth</em></p>
In this example, you first load up the RubyGems library, and then load up the RedCloth library with require. When RubyGems is loaded on the first line, the RubyGems library overrides the require method and enables it to be used to load gems as if they were normal, local libraries. After that point, you can use the RedCloth library, create an object, and call a method on that object. If you get the HTML as output, everything was a success. You ve used your first gem.
Note The one-click installer used by Windows users to install Ruby and RubyGems makes it so that
RubyGems is loaded by default with all Ruby programs run on that machine, so require 'rubygems' isn t required, although it does no harm either way.
Installing a More Complex Gem
Let s look at a second example of installing a gem to see the realities of installing more complex gems. Hpricot is an HTML/Web page processing library for Ruby that uses a parser written in C for speed. This requires the C code to be compiled, and although C compilers are commonly available on Unix/Linux and Mac OS X machines, they re less common on Windows machines. This demands that two versions of each release of the Hpricot gem are made available: one for machines that can compile the C code, and one for Windows machines with a precompiled version.
Note You ll use Hpricot in 14 to process Web page content, so installing Hpricot now is advised if
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